Advancing material of indeterminate length – With material-responsive control means – To position material laterally
Patent
1990-10-25
1992-05-12
Stodola, Daniel P.
Advancing material of indeterminate length
With material-responsive control means
To position material laterally
242 7551, 242 571, B65H 23028, B65H 2314
Patent
active
051119862
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION
This application is a National Phase application of PCT/DE90/00244 filed Mar. 27, 1990 and based, in turn, on German National application P 39 10 548.2 filed Apr. 1, 1989.
FIELD OF THE INVENTION
The invention relates to a web-motion controller for the correction of lateral deviations of a running web from the preset position, with a guide frame and two axially parallel and spaced apart guide rollers supported therein, the web of material running between these rollers and being deflected on each of them by essentially 90.degree. from the guide plane formed by the two guide rollers, and with a position sensor monitoring the lateral displacements of the web downstream of the second guide roller, the output signal of this sensor being translated into control commands for a servomotor pivoting the guide frame.
BACKGROUND OF THE INVENTION
Web-motion controllers of this kind are known for instance from DE 31 25 852 Cl or DE 35 35 011 C2 (U.S. Pat. No. 4,760,945).
OBJECTS OF THE INVENTION
It is the object of the invention to make possible a precise control of the web traction in the running web in a web-motion controller of this type, in addition to the correction of lateral displacements.
SUMMARY OF THE INVENTION
This problem is solved by providing a braking roller wrapped and entrained by the web of material, supported within the guide frame between the guide rollers, axially parallel to these rollers and outside their guide plane, which has a braking device actuated by a servo drive and a dynamometer monitoring the web traction downstream of the braking roller and producing measured-value signals which control the braking device via a control unit set to a preselected value. In a preferred embodiment, the dynamometer monitoring the web traction comprises a measuring drum supported between the braking roller and the second guide roller, axially parallel to both and also wrapped around by the web of material, with measured-value pickups for the forces exerted by the web on the measuring drum, as a result of web traction.
Depending on the actuation of the braking device, the braking roller exerts a smaller or bigger braking force upon the web of material wrapped around the braking roller and this way influences the web traction. The web traction is detected at the measuring drum and--via the control unit--serves again for the actuation of the braking device, so that a closed control circuit for the magnitude of the web traction is established. The desired traction of the web can be preselected through the set-value adjuster in the control unit. Since this regulation of the web traction requires only the winding of the web around the braking roller and the measuring drum, the web traction control according to the invention takes place in a manner which is very gentle to edges and surfaces, so that even sensitive webs of material can be controlled with the web-motion controller of the invention. By arranging the braking roller and the measuring drum within the guide frame itself, between the two guide rollers, no additional space is taken up by the web-traction controller. Thus, the guide frame of the invention which controls simultaneously the web motion as well as the web traction forms a compact mechanism with reduced space requirements. This is particularly important in cases where several overlaying webs of material have each to be regulated by a separate guide frame, as for instance in the case of corrugated cardboard, and where the guide frames have to cooperate so that a guiding of all webs of material can take place with edge precision according to a uniformly set position. As a result, it is possible to achieve a reproducible web traction control with precise regulation of the web motion, under conditions of reduced space and insuring gentle treatment for the web.
It is particularly advisable to set up the arrangement so that the measuring drum is elastically yieldably supported in a stress-measuring bearing transversally to the drum axis and in this dire
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patent: 4369905 (1983-01-01), Tokuno
patent: 4760945 (1988-08-01), Zerle
Bowen P.
Dubno Herbert
Erhard & Leimer GmbH
Stodola Daniel P.
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