Advancing material of indeterminate length – With material-responsive control means – To position material laterally
Patent
1997-12-23
1999-07-13
Walsh, Donald P.
Advancing material of indeterminate length
With material-responsive control means
To position material laterally
242413, 2425631, B23Q 1500
Patent
active
059214520
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for swinging a roll for a moving web, in particular a web of paper or foil, with a servo-drive engaging one end of the roll and actively connected with a mechanism transmitting the adjusting movement of said servo-drive to the opposite end of the roll in the opposite sense. Said mechanism is formed by a shaft which is rotatable by the servo-drive around its longitudinal axis, and provision is made that said mechanism is at least partly disposed in the roll.
A swinging roll for controlling an endless web is known from DE 25 40 923 A1. The two ends of the roll each are engaged by a servo-drive and the servo-drives are synchronously controlled in opposite senses. The roll is swiveled in this way around its center point, which prevents changes in the length of the web on one side. However, the employment of two servo-drives for one roll is costly and the servo-drives, furthermore, have to be synchronized with each other by additional controlling means.
Another device for swiveling a roll is known from DE 14 74 226 A1. A single servo-drive directly affects one roll end. The servodrive is transferred in an opposite sense to the counter end of the roll via angled levers and a thrust bar. In this way, due to the use of a single servo-drive, a swiveling of the roll around its middle is achieved without having to resort to expensive swiveling frames. This device, however, has the drawback that the angled levers and the thrust bar may interfere with the run of the web, so that only small looping angles of the web around the roll can be realized. Furthermore, articulated connections of the angled levers intervene in the movement of the web, so that the latter may be easily soiled by grease contained in such joints. Covering such articulated connections, however, would have the consequence that the looping angles of the web are limited even further.
A device for controlling a belt is known from DE 43 35 747 C1. This device is formed by a roll, which is supported on one side and looped by the belt. A rotatable shaft immerses in the roll and is rotatable around its longitudinal axis by a servo-drive. The shaft is actively connected with the roll via eccentric drivetrains in such a way that the rotary motion of the shaft is translated into an adjusting movement of the ends of the roll in the opposite sense along circular paths.
A device for swinging a roll is known from DE-AS 1 093 315. The ends of said roll are guided in gates each enclosing an acute angle in the direction of movement of the web. One of the ends of the roll is displaceable by a servo-drive along the gate, whereby the counter end of the roll performs; a motion approximately in the opposite direction. This known swinging device, however, has the drawback that the roll also performs an undesirable lateral movement leading to deviation of the web. Furthermore, the entire swinging device is significantly wider than the web, which leads to considerable space problems particularly in connection with web widths of 12 to 14 m as used in the manufacture of paper. In addition, the angle of swivel of the roll is limited by the gates, whereby their extension is impossible as such extension would interfere with the movement of the web.
The invention is based on the problem of creating a roll permitting swinging of the roll around its center without a swiveling frame with the use of one single servo-drive, whereby the run of the web is not obstructed by the device and the roll is maintained stable.
Said problem is solved according to the invention in that the shaft is arranged extending through the roll and coupled with a gearing translating the rotary motion into a swiveling movement of the shaft.
By the shaft extending through the roll, transmission of the adjusting movement of the servo-drive to the counter end of the roll is achieved without interfering with the movement of the web. In particular, such an arrangement results in a particularly compact structure, so that individual rolls can be arranged one after the other in a parti
REFERENCES:
patent: 3399582 (1968-09-01), Henry
patent: 3436002 (1969-04-01), Racine
patent: 3786974 (1974-01-01), Kron
patent: 3958736 (1976-05-01), Pounds
patent: 4077579 (1978-03-01), Seleski et al.
patent: 5467171 (1995-11-01), Castelli et al.
patent: 5554262 (1996-09-01), Turner
patent: 5582339 (1996-12-01), Focke et al.
Note: Ref. A is cited as being of interest in citing the art.
Niemann Heinrich
Wulf Johannes
Erhardt & Leimer GmbH
Pham Minh-Chau
Walsh Donald P.
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