Rotary printing press drying assembly roller

Details Rotary printing press drying assembly roller Rotary printing press drying assembly roller

2001-01-29

2001-10-23

Walberg, Teresa (Department: 3742)

Drying and gas or vapor contact with solids

Apparatus

For hollow article

C101S228000, C101S327000

Reexamination Certificate

active

06305098

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a roller for a rotary printing press drying assembly.
As is known, e.g. in printing paper material bands, a plurality of printing units including known ink applying devices are generally used.
Said printing units comprise drying assemblies, including a plurality of parallel rollers which, immediately after the printing cylinder of the printing unit, extend upward, and then downward, to convey the paper band toward a following printing unit.
The above mentioned drying assemblies operate to remove from the paper band the solvents of the just applied ink, while simultaneously drying said ink.
Since the bands to be printed, generally made of a paper material, are greatly hygroscopic, they, upon contacting the printing cylinder, absorb a comparatively great amount of ink and solvent particles, thereby causing the paper band to greatly expand.
Moreover, since the paper band is mainly stressed, as it is conveyed, by a pulling force, the longitudinal expansions are integrally compensated for, whereas the cross expansions of the paper band cannot be compensated for and, accordingly, as the paper band passes through the series of parallel rollers of the ventilating assembly, a plurality of comparatively narrow creases extending in the band feeding direction are formed.
In a finished product, said creases would constitute a waste generating defect, with a consequent yield decrease.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to overcome the prior art drawbacks, and provide a particular type of roller, to be used in a drying assembly, which allows to safely prevent longitudinal creases from being formed within a printed paper band.
According to the invention, the above object is achieved by a roller to be arranged in a roller series in a drying assembly, said roller being circumferentially provided with a plurality of equispaced slots which are arranged parallel to the longitudinal axis of the roller and are delimited by projecting ribs.
Thus, about the circumference of each roller a plurality of slots allowing the movable band, partially contacting longitudinal ridges delimiting a related slot, to be extended in a cross direction, thereby eliminating possible paper creases, and allowing the paper band to extend in the width direction thereof are defined.
Advantageously, the valleys and ridges define circle sectors, each of which encompasses an angle of approximatively 15° to 35°.
Moreover, the slots and ridges are formed with an arch length of about 30 mm.
Owing to the interruption of the continuous circumference of each roller, by providing valleys in the form of broad slots alternating with ridges or ribs, the paper band can be moved and extended in the width direction thereof as it passes through the free space formed by said slots, thereby preventing or compensating for any permanent formations of undesired creases in the printed band.


REFERENCES:
patent: 3556005 (1971-01-01), Koch
patent: 4116594 (1978-09-01), Leanna et al.
patent: 4502228 (1985-03-01), Helbig et al.
patent: 4781116 (1988-11-01), Harada
patent: 5188273 (1993-02-01), Schmock
patent: 5415094 (1995-05-01), Morrone
patent: 5421259 (1995-06-01), Shiba et al.
patent: 5483887 (1996-01-01), Grosshauser
patent: 5795323 (1998-08-01), Beck
patent: 5978001 (1999-11-01), Furlani et al.
patent: 6082258 (2000-07-01), Harrington
patent: 6116159 (2000-09-01), Koyama
patent: 6145218 (2000-11-01), Kotitschke et al.
patent: 4401378 (1994-06-01), None

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