Cylinder

Details Cylinder Cylinder

1998-12-22

1999-12-21

Wright, Dirk

Planetary gear transmission systems or components

Planetary gearing or element

Coaxial teeth around planet pinion engage axially spaced...

74640, B41F 1362, B65H 4516, F16H 100

Patent

active

060042427

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a cylinder with rotating radial cams for operating in a controlling cam rollers of a processing means such as point needles or a folding blade in a folding apparatus of a rotary printing press.
Description of the Prior Art
DE 44 08 202 A1 shows a folding cylinder in a folding apparatus with a shift device for operating in a collecting or in a non-collecting mode. This folding cylinder is provided with a fixed radial cam and with a cover disk, which can be driven by the folding cylinder by means of a planet wheel gear for controlling holding, or respectively folding mechanisms. The rotating cover disk is provided with internal teeth, which are engaged by a planet wheel, which is rotatably seated on the prior art folding cylinder. This planet wheel acts together with a twistable, but otherwise stationary sun wheel. This sun wheel is arranged coaxially in relation to the folding cylinder.
With this prior art folding cylinder it is disadvantageous that the planet wheel gear blocks access to the cylinder journal on the front end.
GB 2291862 A discloses a planet wheel gear with two sun wheels. An associated planet wheel engages each sun wheel, whose rotating shafts turn.
A collecting cylinder with two rotating cover disks is known from DE 40 41 613 A1. These rotating cover disks are seated coaxially in relation to the rotating shaft of the collecting cylinder and can be driven by means of a gear and are phase adjustable.
It is the object of the present invention to create a cylinder with a rotating radial cam.
This object is attained in accordance with the present invention by the provision of a cylinder having at least one rotating radial cam which controls a cam roller that actuates point needles, a folding blade, or other processing means of a folding apparatus. A planet wheel gear is provided for rotating the radial cam. The phase relationship of the radial cam, with respect to the cylinder of the folding apparatus, can be varied. The planet gear wheel essentially consists of two sun wheels with internal teeth and a rotating planet wheel. A position of the engagement area of the planet wheels and the sun wheels can be changed to effect the phase change.
The advantages which can be attained by means of the present invention reside in particular, in that an unlimited phase adjustment of radial cover cams becomes possible. This phase adjustment can be performed continuously and while the gear is turning.
Access to a cylinder journal is made possible by arranging the planet wheel gear on a second shaft, which extends parallel with a first rotating shaft of, for example, a cylinder. This permits the stable seating of the cylinder journal. The planet gear can also be arranged on a side of the cylinder which is provided with a drive. If several rotating radial cover cams are provided, the arrangement of the associated planet wheel gears coaxially one behind the other is advantageous, since this permits a very compact structure.
If the planet wheel gear is designed as a "harmonic drive" gear, a particularly sensitive adjustment becomes possible, since these gears permit large gear reductions in a very small space. In addition, in comparison to a conventional planet wheel gear, for example, the rpm of the planet wheel are low and the contact ratio of the teeth is very great, which reduces wear.
It is furthermore advantageous, that the planet wheel gear, or respectively the "harmonic drive" gear, is driven by the drive unit of the cylinder, so that no additional drive means are necessary.


BRIEF DESCRIPTION OF THE DRAWINGS

The cylinder in accordance with the invention is represented in the present drawings and will be described in greater detail in what follows.
Shown are in:
FIG. 1, a schematic representation of a collecting and folding cylinder with associated "harmonic drive" gears;
FIG. 2, a schematic representation of the collecting and folding cylinder with associated planet wheel gears.


DESCRIPTION OF THE PREFERRED EMBODIMENTS

A collecting and foldin

REFERENCES:
patent: 4892036 (1990-01-01), Lange
patent: 5287805 (1994-02-01), Fischer et al.
patent: 5305993 (1994-04-01), Staeb
patent: 5676630 (1997-10-01), Mayr

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