DE1075128B - Device for cross-cutting paper webs in rotary machines - Google Patents

Description

GERMAN

The invention relates to a device for cross cutting of paper webs in rotary machines, in which the knife cylinder and the groove cylinder are in the immediate vicinity of the collecting cylinder, so that the paper web at least partially has a guide on the collecting cylinder when the cutting process takes place.

If a paper web leaving a printing unit is then cut into sheets in the cutting unit, which are fed to a collecting and folding unit, this is done either by grippers that the Hold the sheet by its leading edge in relation to the running direction and pass it on, or through Puncture needles that pierce the arches and thereby hold them on the cylinder. The latter type Although it has the advantage that the distance between the sheets on the due to the installation of the gripper Cylinder is omitted and the diameter of the same can be reduced to a minimum, but but the arches are damaged by the puncture needles, which is undesirable in many cases.

To determine the distance between the sheets on the collecting cylinder, which is required by the installation of the gripper is to be avoided, another possibility has become known, according to which the gripper instead of lengthways the leading edge of the sheets are attached to the side of the cylinder. This design, the bow only on the two To hold the front corners, but has the disadvantage that the sheet is along the front edge of the cylinder stands out, which gives rise to disturbances. Furthermore, this design requires on both sides of the collecting cylinder Eccentric for operating the gripper.

Collecting the sheets causes additional difficulties. For this you either use the Bows at the front edge or alternating grippers that grip sideways, or puncture needles. If the grippers are arranged along the leading edge of the sheet, two gripper shafts are directly one after the other, which makes an increase in the cylinder diameter necessary and additional requires mechanical parts.

The device according to the invention differs from the known devices by one with the collecting cylinder converging cylinder, whose cams the leading edge of the cut Arch between the arranged in the collecting cylinder and within the outer surface of the collecting cylinder Introduce the movable gripper and the gripper pad in its running direction, as well as one with it the collecting cylinder cooperating work roll or belts, which the paper sheets during the Promote opening and closing of the gripper.

The design according to the invention has the following advantages over the known:

Device for cross cutting
of paper webs in rotary machines

Applicant:

Ringier & Co. A.G.,

Zofmgen, Aargau (Switzerland)

Representative: Dr.-Ing. E. Liebau, patent attorney,
Göggingen near Augsburg, Von-Eidiendorff-Str. 10

Claimed priority:
Switzerland from January 12, 1957

Rudolf Moser, Zofingen, Aargau (Switzerland),
has been named as the inventor

The inventive arrangement and design of the gripper, a distance between the sheets is the collecting cylinder avoided. This makes it possible to use a cylinder with a smaller diameter to use, as with the design, which uses punctures, but without the occurring Disadvantage. Because the sheet, which after the cut for the most part is already on the collecting cylinder rests, guided by the work roll or by belts for the duration of the opening of the gripper shifting out of the correct position is prevented. In addition, this design allows with only ever get by with one gripper roller. This reduces the mechanical effort and the whole device simplified.

An example embodiment of the device is shown in the drawing.

Fig. 1 shows an overview of a rotary folder with a gripper for variable paper formats and for a longitudinal fold and a transverse fold, d. H. Funnel and cylinder fold;

Fig. 2 shows the part of the device in section through which the sheet transfer to the collecting cylinder he follows.

According to the embodiment shown, the paper strand runs from the rotary printing press via the funnel I ₁ where the longitudinal fold takes place. The longitudinally folded strand 11 is then fed to the cutting device 4, 5 by means of guide rollers 2 and pull rollers 3. Here, the grooved cylinder 4 is moved so close to the collecting cylinder 6 that it is possible

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is borrowed to transfer the paper strand 11 from the groove cylinder 3 directly to the collecting cylinder 6.

The cut sheet 12 is grasped by the grippers 10 after being separated from the paper strand 11, d. H. after the sheets 12 have covered the distance j. As can be seen from FIG. 1, the strand 11 has already guidance on the collecting cylinder before the cutting process he follows.

In order to give the sheet 12 good guidance on the collecting cylinder 6 or to bring the sheet up to the circumferential speed of the collecting cylinder 6, a work roller 7 is provided which works together with the collecting roller 6 via belts 14. The belts 14, several of which are located along the cylinders 6 and 7, are guided as endless belts around a guide roller 6 a (FIG. 1), around the work roller 7 and the roller 8. The cams 9 of this roller are located between the belts 14, seen in the longitudinal direction.

The sheets 12 are, while they are cut, from the roller 7 through the intermediary of the belts 14 pulled and tensioned to ensure a reliable separation of the sheet 12 from the paper web 11 when To achieve cut, whereupon the roller 7 or the belts 14 together with the cylinder 6 the further guidance and take over the conveyance of the sheet 12.

The roller 8 is provided with cams 9 which place the front edge of the respective sheet 12 around the edge 13 in the cylinder 6, while the grippers 10, of which several can be present along the cylinder, are open. After folding the leading edge of the paper around the edge 13, the grippers 10 close in the opposite direction to the direction of the roller, in that they always remain within the outer surface. The cams 9 have recesses 9 α at the level of the grippers 10 so that the grippers can close while the cams are still in the working position.

In the case of the greatest cutting length, the distance s is at least equal to that which the grippers 10 need to open and close in order to grasp the sheet 12.

The speed of the incoming paper strand 11 coincides with the maximum cutting length of the paper approximately with the peripheral speed of the collecting cylinder 6, that is, the sheets follow each other with practically no distance. However, if the intended cutting length is shorter than the maximum length, the speed of the incoming strand is smaller by the distance s and greater by the difference in the cutting length. The arcs follow each other with the distance that results from the difference between the maximum cutting length and the intended cutting length.

The grippers 10 always open and close when passing the cam cylinder 8, that is, both the first sheet and the collective sheet are gripped by the same gripper 10. On the path s, ie after the sheet has been cut from the strand 11 until it is grasped by the gripper 10, the sheet 12 is pressed by the tear-off roller 7 or the belts 14 against the collecting cylinder 6, thereby preventing it from moving out of the correct position.

Claims (1)

Claim: Device for cross-cutting paper webs in rotary machines, in which the knife cylinder and the grooved cylinder are in the immediate vicinity of the collecting cylinder, so that the paper web is at least partially guided on the collecting cylinder when the cutting process takes place, characterized by a cylinder converging with the collecting cylinder (6) (8), the cam (9) of which the leading edge of the cut sheet between the one in the collecting cylinder (6) arranged and within the lateral surface of the collecting cylinder (6) in its Introduce the movable gripper (10) and the gripper support (13), as well as one with the collecting cylinder cooperating work roll (7) or belts (14), which the Convey paper sheets (12) during the opening and closing of the gripper (10). Considered publications:
German patent specifications No. 596 596, 536 459. 1 sheet of drawings ©, «09 729/91 2.60