JPS6359942B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a folding device for folding sheets or stacks of sheets, of the type having a folding knife and two folding cylinders.

Folding devices for folding sheets or sheet bundles, which are equipped with a folding knife and two folding cylinders, which can be configured for rotary or linear movement, are used in particular for book printing machines and small articles. It is provided in printing machines and newspaper printing machines and is located in front of the paper discharge device. This kind of folding device is
It serves primarily for folding sheets, and in most cases for performing a second longitudinal fold. The sheets folded in this way, usually a stack of sheets, are grouped together and cut along the side edges in a separate cutting machine.

The aim of the invention is to improve the known device in such a way that the construction costs and construction space are low and reliable and economical operation is obtained.

In order to achieve this objective, the configuration of the present invention includes:
In a folding device of the type mentioned at the outset, one folding cylinder is provided with a circular knife which projects beyond the circumferential surface of this folding cylinder, and the other folding cylinder is provided with an elastic material opposite said circular knife. A shear ring is provided with a counter member in the form of a ring made of plastic or with counter cutting edges made of a hard material. With such an arrangement, a cutting operation, which requires a conventional transport to a separate cutting machine and additional time, is combined into a folding operation, in which case only significantly less expensive construction is required in the folding device. Overall, the arrangement according to the invention results in significant space and cost savings.

According to an embodiment of the invention, the shearing ring made of a hard material, for example steel, has a ring groove, one outer edge of which forms a counter-cutting edge for the circular knife.

According to an advantageous embodiment of the invention, the circular knife and the counterpiece or shearing ring are each clamped between two clamping rings, which clamping rings are split radially so that they are separated at one split point. It has a recess for passing the clamping strip of the folding cylinder, and a unit consisting of a circular knife, a counterpiece or a shearing ring is arranged in a ring groove in the basic body of the folding cylinder. Such a structure not only has the advantage of being simple and reliable in operation, but also has the advantage that the ring engagement groove can be provided at any location on the base of the folding cylinder. Therefore, the sheets or stacks of sheets are not only cut, ie trimmed, along the side edges;
If required, a cut in the middle, or possibly both, can be made.

Next, embodiments of the present invention will be specifically described using the drawings.

The folding device shown in FIG. 1 has a rotating folding knife 1 and two folding cylinders 2 and 3. Sheet or stack of sheets to be folded
is conveyed via a slide plate 40 to the underside of the folding knife 1 which carries out a vertical movement and is forced between the driven folding cylinders 2 and 3 when forming the fold. The sheet or stack of sheets then reaches an impeller 43 between the guide plates 41, 42 and from there onto a delivery conveyor belt 44. The folding cylinders 2 and 3 can be pivoted relative to each other via a lever arm 45, as indicated by arrow A, and are loaded with a spring force (not shown).

The folding cylinders 2 and 3 include base bodies 20 and 30, and grooves 2 formed on the circumferential surface of the base parallel to the axis of the base.
Insert strips 22, 32 housed in 1, 31
and a segmented retraction ring 24, 34 housed in a cylindrical step 23, 33 formed at the end of the circumferential surface of the basic body. The retraction rings 24, 34 are inserted into the grooves 21, 30 of the base bodies 20, 30,
An insert strip 2 extending within 31 in the axial direction of the base body.
It has notches 53 and 63 for passing through the holes 2 and 32. The clamping strips 22, 32 and the retraction rings 24, 34 are generally made of hardened steel and are notched on their outwardly facing surfaces to ensure a secure clamping of the sheet or stack of sheets X. Or something useful for grasping and pulling.
Pinching strips 22, 32 and retraction ring 2
The outwardly facing notched surfaces (grasping surfaces) of 4,34 project beyond the circumferential surface of the base bodies 20,30.

As shown in particular in FIG. 2 and also in FIG. It is tightened between rings 71 and 72, in this case tightening rings 51, 52, 61, 62,
71 and 72 to enable attachment.
It is divided in the radial direction, and has notches 53, 63 at one of the dividing points for passing the inserting strips 22, 32 through. Circular knife or counter member 6 or shear ring 7 and clamping rings 51, 52 or clamping ring 6, respectively
1, 62 or tightening rings 71, 72 and a ring engagement groove 25 in the base body 20 or 30 for the unit formed by the screw connection 54 or the screw connection 64 or the screw connection 74.
Alternatively, a ring fitting groove 35 is provided.
The circular knife and the counterpiece 6 or shearing ring 7 made of elastic synthetic resin are of circular design, at least in the installed state, continuously, that is to say without interruption. Insert strip 2
2 and 32 are notches 22 through which the circular knife 5, opposing member 6, or shear ring 7 is passed.
0 or 320.

As shown in FIG. 3, the shearing ring 7 has a ring groove 75 whose outer edge on one side forms a counteredge for the circular knife 5.

In the mode of operation of the embodiment described above, the sheet or stack of sheets is simultaneously folded and when it is guided through the gap between the folding cylinders 2, 3. Alternatively, the side edges of the sheet stack can be cut or trimmed, so that no additional working time is required for cutting or trimming.

Depending on the arrangement and number of circular knives and counter members or shear rings, cuts can be made at arbitrary locations and for different purposes. Known configurations of folding cylinders are useful for such cutting, in which a draw-in ring can be used to cut the sheet width or length or cut the sheet by means of a spacing ring that can be inserted into a suitably configured base body. It can be adjusted in the axial direction depending on the paper stack width or length. In this case, the unit with the circular knife and counterpiece or shear ring can be inserted at any point in the same way as the space rig or the retraction ring, without the need for a separate ring-engaging groove for this purpose. Such a ring engagement groove is formed between two space rings or one space ring and a retraction ring in the base body.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the invention,
Fig. 1 is a side view of the folding device, Fig. 2 is a partially cutaway plan view of the folding cylinder of the folding device, and Fig. 3 is a side view of the folding device.
The figure is a partial view showing a modified embodiment of FIG. 2. 1... Folding knife, 2 and 3... Folding body, 5...
... circular knife, 6 ... counter member, 7 ... shearing ring, 20 ... base body, 21 ... groove, 22 ... pinching strip, 23 ... step, 24 ... retraction ring, 25 ... Ring engagement groove, 30...Base, 3
1... Groove, 32... Inserting strip, 33... Step part,
34...Retraction ring, 35...Ring engagement groove, 40...Sliding thin plate, 41...Guiding thin plate, 4
2... Sliding thin plate, 43... Impeller, 44... Paper discharge conveyor belt, 45... Lever arm, 51
and 52... tightening ring, 53... notch, 5
4... Threaded joint, 61 and 62... Tightening ring, 63... Opening, 64... Threaded joint, 71 and 72... Tightening ring, 74... Threaded joint,
75...Ring groove, 220 and 320...Notch, X...Sheet bundle.

Claims (1)

[Claims] In a folding device for folding one sheet or a bundle of sheets, which is equipped with one folding knife and two folding cylinders, one of the folding cylinders 2 is A circular knife 5 is provided which projects beyond the circumferential surface of the folding cylinder, and the other folding cylinder 3 is provided with a
A sheet or sheet of paper, characterized in that, opposite the circular knife, there is provided a counter member 6 in the form of a ring made of an elastic material or a shearing ring 7 made of a hard material and provided with counter cutting edges. Folding device for folding bundles. 2. The shear ring 7 made of a hard material has a ring groove 75, one outer edge of which forms a counter cutting edge for the circular knife 5. Folding device. 3 The circular knife 5 and the counter member 6 or shear ring 7 each have two clamping rings 51, 5
2; 61, 62; 71, 72; these clamping rings are split in the radial direction and pass through the clamping strips 22, 32 of the folding cylinders 2, 3 at one split point; a notch 53 for
63, and a unit consisting of a circular knife 5, a counter member 6 or a shearing ring 7 is arranged in the ring grooves 25, 35 provided on the circumferential surface of the base bodies 20, 30 of the folding cylinders 2, 3. A folding device according to claim 1.