US 4,285,130 AGranted

Control devices for web-feeding machines

AssigneeMasson Scott Thrissel Engineering Limited

InventorKenneth Chandler

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Abstract

This application covers a device included in the microprocessor control for winders or sheeters; the device is arranged to stop the machine when a desired length of web has been fed by accurately-timed start of deceleration from full speed. This avoids the need to run at a lower speed for a period as the desired length is approached. In the device, the web speed is sensed by a transducer which delivers a speed signal, and from this is calculated the length of web which will be fed during standard deceleration. The result of this calculation can then be compared with the difference between desired length and length already fed (or the result plus length already fed can be compared with desired length) and when the result of this comparison indicates deceleration should start a signal is sent to the braking system. As an alternative to calculation of length of web fed during deceleration from the sensed speed, the result may be obtained by a "table look-up" operation.

Claims11

Dependent claims

A control device for a machine for feeding continuous web material (e.g. a paper winder) comprising means for presetting a desired length of web to be fed;

means for sensing the web speed during feeding and producing a signal representing said speed;
means for producing a length signal representing the length of web already fed;
data processing means connected to said presetting means, to said speed sensing means and to said means for producing a length signal;
and braking control means operable in response to a brake control signal to produce controlled deceleration of the web;
said data processing means being adapted in response to said speed signal to produce a run-out signal representing the length of web fed during said controlled deceleration of the web from the speed represented by the speed signal and then to compare said run-out signal, said length of signal, and a signal from the presetting means representing said desired length, and to deliver said brake control signal to the braking control means when said comparison indicates that the desired length of web minus the length already fed is not greater than that represented by the run-out signal.

2 more elements

Dependencies are inferred from the claim text.