Machine element or mechanism – Gearing
Patent
1998-12-21
1999-11-16
Ta, Khoi Q.
Machine element or mechanism
Gearing
475221, 475338, B65H 4516
Patent
active
059837535
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to gears for adjusting the phase relation of a plurality of rotating drive means.
DESCRIPTION OF THE PRIOR ART
DE-AS 19 43 579 describes a device for setting the register on offset printing presses during their operation. Here, a crown gear seated coaxially in respect to the rubber blanket cylinder meshes with a crown gear fixedly seated on the plate cylinder and with a crown gear fixedly seated on the counter-pressure cylinder.
The crown gear of the rubber cylinder constitutes a sun wheel, with which an adjustable planet wheel gear meshes. A second crown gear is rotatably seated coaxially in respect to the rubber blanket cylinder and is in operative connection via two gear wheels, which are connected with each other, fixed against relative rotation.
An intermediate gear in printing presses for the adjustment of the phase relation of the axial distribution movement of distributing rollers by means of a planet wheel gear is known from DE 38 14 927 C1.
U.S. Pat. No. 5,415,595 discloses a gear arrangement for the phase adjustment of two planet wheel gears. These two planet wheel gears are intended to minimize occurring play between the teeth.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a gear for adjusting the phase relation of a plurality of rotating drive means.
This object is attained in accordance with the present invention by providing a plurality of rotating drive means which are supported coaxially with respect to each other on a first rotating shaft. Each of these rotating drive means is driven by an associated sun gear which, in turn, is driven by a planet wheel gear. A position of engagement of each planet wheel gear with respect to its associated sun gear can be varied. This will adjust the phase relationship between the rotating drive means. The planet wheel gears are arranged coaxially on a second shaft which is parallel with the first rotating shaft.
The advantages which can be attained by means of the present invention reside, in particular, in that an unlimited phase adjustment of, for example, rotating 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 means of 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, and 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 set of gears in accordance with the present invention is represented in the 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; and in
FIG. 2, a schematic representation of the collecting and folding cylinder with associated planet wheel gears.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A collecting and folding cylinder 1, not represented in detail, for a folding apparatus of a rotary printing press is seated in lateral frames 2 and provided with processing tools, for example with point needles and folding blades, all
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Koenig & Bauer Aktiengesellschaft
Ta Khoi Q.
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