Winding – tensioning – or guiding – Material guide or guard – Angled turning guide for a web
Patent
1998-10-29
2000-04-11
Jillions, John M.
Winding, tensioning, or guiding
Material guide or guard
Angled turning guide for a web
B65H 2332
Patent
active
060479221
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a turning bar arrangement for material webs, in particular paper webs of a rotary printing press.
DESCRIPTION OF THE PRIOR ART
It is generally known to change turning bars, i.e. to change their axial position by 90.degree., in connection with a production change of the rotary printing press. It is therefore necessary for the air outlet openings in the turning bar to be located on the side around which the paper web is wound. To accomplish this end, a turning bar arrangement for guiding of ribbons above each other is proposed in DE 40 13 229 C1, wherein an angled turning bar is arranged in a first plane, and a parallel turning bar is arranged in a second plane. In case of a production change, the turning bars are shifted, and in the process their functions are simultaneously exchanged. It is required to this end to guide the incoming paper web, or respectively the incoming paper ribbon, into another plane, or respectively another level.
In this prior art device, it is disadvantageous that the shifting of the turning bars from one operating position via an extended 45.degree. center position into another operating position requires approximately 50% more structural space.
Further than that, because of the wear of the components at the turning and pivoting points of the turning bars, the exact reproduction of an operating position is not a certainty.
In accordance with another prior art variation in DE 40 13 229 C1, the turning bars are seated overhung, rotatable by 90.degree. and height-adjustable. The above mentioned disadvantages also apply in this case.
Together, both prior art arrangements have the disadvantage that quarter-width paper webs cannot be intermixed into the newspaper in all positions. This is impossible because the displacement and shifting of the turning bars can only take place within the inside width of the lateral frame.
DE 2447656 A1 describes a turning bar arrangement with two pairs of turning bars. These are arranged one on top of the other and are crossed in respect to each other.
U.S. Pat. No. 3,809,303 discloses turning bars which can be displaced on longitudinal guides.
It is the object of the present invention to create a turning bar arrangement.
This object is attained in accordance with the present invention by providing a turning bar arrangement for material webs that has at least one turning deck. A first pair of turning bars and a second pair of turning bars are provided. The second pair of turning bars is located underneath the first pair of turning bars. The first pair of turning bars is arranged horizontally, and at an angle of 45.degree. with respect to the running direction of the incoming material web and is supported by two spaced lateral frames. The second pair of turning bars are offset by 90.degree. with respect to the first pair of turning bars.
The advantages which can be achieved by means of the present invention lie, in particular, in that components as well as elaborate mechanisms for the shifting of turning bars are omitted. A correct angular web deflection position of the turning bars is assured in every case, because of which tension differences in the paper web across the width of the paper web are prevented. Also, no mechanisms for the height adjustment of turning bars, nor mechanisms for changing the position or the function of air outlet openings are required. No readjustment of the deflection angle of the turning bars is necessary when the paper web guidance is changed.
A web deflection angle adjustment is required only at or prior to the first start-up. Rotating or pivoting of the turning bars, with changes of the paper web guidance, can be omitted.
It is only necessary to displace the turning bars parallel in respect to each other in the horizontal direction. In the process, they always remain exactly parallel.
A further advantage is achieved by the possibility of now installing a paper draw-in device acting in only one direction in the turning decks.
Finally, the refitting times during prod
REFERENCES:
patent: 1610671 (1926-12-01), Funk
patent: 3809303 (1974-05-01), Brunner
patent: 5100117 (1992-03-01), Hajek et al.
patent: 5121910 (1992-06-01), Hajek et al.
patent: 5263414 (1993-11-01), Lehrrieder et al.
Der Polygraph May 5, 1970 pp. 562-564.
Jillions John M.
Koenig & Bauer Aktiengesellschaft
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