DE19908120A1 - Cutter knife cylinder has eccentric support, cylinder shaft, knife blades, pivot axle and drive mechanism - Google Patents

Abstract

The cutting knife cylinder (1) has at least one support (30) eccentrically mounted in relation to the cylinder shaft (3). At least two knives (32,33) are fixed to the support and are each positioned on different support surfaces staggered at an angle in relation to the periphery of the support. The support is rotated on a pivot axle (31) by a drive mechanism into different operating positions in relation to a blade (7)

Description

The invention relates to a device for simple changeover production of sections of the same length on steady alternately short or longer cut products ("short Long cut ") on folding units.

[State of the art]

The invention is based on a folder, both for the collective as well as normal production can be used. The cover sheet is cut longer in the case of collective production than the section of the insert. From DE-PS 6 71 790 is a Known cutting cylinder, the two cutting knives so attached arranges that they vary the circumference of the cylinder split long sections. With this arrangement continuous alternating long and short sheets cut off. To the edges of the outer sheet coincide with the folding those of the insert. In the case of no longer trimmed Products are thereby avoided and staggered you can avoid the so-called Schnitzel problem. The cutting off under the schnitzel problem the very narrow paper strip (schnitzel) - from the outside Bow - is meant when trimming the collected Product in post processing.

When converting the printing press to production, the same Any sections that are not collected must include the Cutting knife bars are offset. With otherwise automatic There is a retrofitting process on printing presses Danger of forgetting this manual modification. this leads to increased waste and requires the print job to be canceled gangs.

The invention has for its object to provide a device with which the position of cutting knives on the circumference of Cutting knife cylinders can be changed automatically. The object is achieved by the characterizing Features of the claims solved.

The invention enables retrofitting of the knife cylinder from "short-long" to the same length of cutting without manual Intervention can be made. The invention enables automated, fast Converting a folder from collective to normal production and vice versa.

Based on the following embodiments, the inven explained in more detail.

The drawings show in detail:

Fig. 1 side view of a cutting knife cylinder

The exemplary embodiment shown in FIG. 1 shows a cutting knife cylinder ( 1 ) in side view, which has a carrier ( 30 ) in relation to a knife ( 7 ) fixedly attached to the circumference. Two knives ( 32 , 33 ) are mounted on this carrier ( 30 ) which is rotatably mounted about an axis of rotation ( 31 ). In the illustrated position, a knife ( 33 ) is aligned with the axis of rotation ( 31 ), with the axis of symmetry of the cutting knife cylinder ( 1 ) and a fixed knife ( 7 ). In this setting, sections of the same length are produced. On the surface of the carrier ( 30 ) opposite the knife ( 33 ) there is another knife ( 32 ) which is offset by the distance s from the flight. This knife ( 32 ) or other knives, which are offset by different distances s from the swivel axis, can also be arranged on other surfaces of the knife carrier ( 30 ) which are shaped on the circumference as desired. Via a transmission device ( 35 ) this knife ( 32 ) is moved by a drive ( 34 ) into its circumferential working position. In this position, the knife ( 32 ) divides the circumference of the cutting cylinder ( 1 ) into two sections of different lengths for the production of generic products.

As a drive for rotating the carrier ( 30 ), a pneumatic swivel cylinder can also be flange-mounted on the end of the axis of rotation ( 31 ).

The still free surfaces of the carrier ( 30 ) can be occupied with further knives, which are either used as a replacement for worn out knives ( 32 , 33 ) or are offset by a different amount s, so that webs of different thicknesses for the collection production can be cut.

Reference list

1

Cutting knife cylinder

3rd

Cylinder shaft

7

knife

30th

carrier

31

Axis of rotation

32

knife

33

knife

34

drive

35

Transmission unit

Claims (4)

1. Cutting knife cylinder ( 1 ), with a device for changing over the production of sections of the same length to constantly alternating shorter or longer cut products ("short-long cut"), characterized in that eccentrically to the cylinder shaft ( 3 ) at least one carrier ( 30 ) is mounted, on which at least two knives ( 32 , 33 ) are attached, which are arranged on different surfaces of the support ( 30 ) which are formed on each other and offset angularly from one another on the circumference, and by means of a drive ( 34 ) which is connected to a Transmission unit ( 35 ) is coupled, about an axis of rotation ( 31 ) in different working positions relative to a knife ( 7 ) can be moved. 2. Cutting knife cylinder ( 1 ) according to claim 1, characterized in that two knives ( 32 , 33 ) are each arranged on opposite surfaces of the carrier ( 30 ). 3. Cutting knife cylinder ( 1 ) according to claim 1, characterized in that the drive of the axis of rotation ( 31 ) by at least one end face on the axis of rotation ( 31 ) BEFE Stigt pivot cylinder, which is supported on the Schneidzy cylinder ( 1 ). 4. Cutting knife cylinder ( 1 ) according to claim 1, characterized in that the drive of the axis of rotation ( 31 ) by at least one end with the axis of rotation ( 31 ) rotatably connected lever is carried out on the one, on the cutting cylinder ( 1 ), Lift cylinder is articulated.