Cutting – Cutting motion of tool has component in direction of moving... – With means to render cutter pass ineffective
Patent
1997-11-20
1999-11-16
Young, Lee
Cutting
Cutting motion of tool has component in direction of moving...
With means to render cutter pass ineffective
83343, 8369851, 8369861, B26D 156
Patent
active
059837640
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a cutting device for transverse cutting of moving webs, in particular in a folding apparatus arranged downstream of a rotary printing press.
A cutting cylinder, having an even number of cutters, is arranged to cooperate with a cylinder having cutter bars. In one mode of operation, first and second cutters are fastened on the cutting cylinder exactly diametrically opposite to each other. In a second mode of operation the first cutter is secured to the cutter cylinder shifted in a circumferential direction with respect to the second cutter by a specific distance or length.
DESCRIPTION OF THE PRIOR ART
EP 0 364 864 A2 describes a cutting device in a folding apparatus of a rotary printing press. In this prior art device the change to different cutting lengths of signatures is performed in that an inner and an outer portion of the cylinder are turned in respect to each other. This is made possible by an additional, second gear train.
An increased structural volume of the cutting cylinder and the need for a second gear train are required by this prior device.
In the prior German document No. DE-C-670 790 there is described a cutting device wherein in a first mode of operation two cutters are arranged diametrically opposite to each other, and in a second mode of operation one of the cutters is disposed offset with respect to the second cutter.
A cutting device having a phase shift between two cylinders, which are taking part in the cutting process, is shown in U.S. Pat. No. 4,009,626. In this prior art device, the phase shift is used to set the length of a section.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a cutting device for transverse cutting of running webs into signatures, which can be switched from a first mode of operation of "signatures of equal length" to a second mode of operation of "alternating signatures of different lengths".
This object is attained in accordance with the invention by providing a cutting cylinder with an even number of cutters or cutter blades. These cutters are disposed on the cutting cylinder exactly diametrically opposite to each other at 180.degree. when the cutting cylinder is operated in its first or "signatures of equal length" mode. In its second or "alternating signatures of different lengths" mode, the first cutter is shifted circumferentially with respect to the second cutter on the periphery of the cutting cylinder. A phase shift in the circumferential direction is provided between the cutting cylinder and a cooperating cylinder that is provided with cutter bars.
The advantages which can be achieved by the present invention consist in particular in that a simple switch or change of the cutting device from a "non-collecting operation" to a "collecting operation" is possible. In the process, the cutting cylinder can be twisted in respect to the collecting cylinder by means of a simple phase adjustment, which results in time savings and therefore reduces set-up costs. The size and structure of the cutting cylinder are not changed, so that customary cutting cylinders can be used. Existing cutting cylinders with obliquely toothed drive wheels can also be refitted later, since only one axial displacement device for the drive wheel needs to be provided. A correction of the cutting register is also possible by means of the phase-adjustable cutting cylinder.
In addition, so-called chipping can be prevented.
BRIEF DESCRIPTION OF THE DRAWINGS
The cutting device in accordance with the invention is represented in the drawings and will be described in more detail in what follows.
Shown are in:
FIG. 1, a schematic, side elevations view of a cutting device in accordance with the present invention in the position of "non-collecting operation",
FIG. 2, a schematic, side elevation view of a cutting device in accordance with the present invention in the position of "collecting operation", and
FIG. 3 a schematic representation of a drive for a cutting device in accordance with the present in
REFERENCES:
patent: 4009626 (1977-03-01), Gressman
patent: 4295843 (1981-10-01), Otomaru
patent: 4467687 (1984-08-01), Fokos et al.
patent: 5017184 (1991-05-01), Takahori et al.
Koenig & Bauer--Albert Aktiengesellschaft
Vereene Kevin G.
Young Lee
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