Web spreader and guide
AssigneeBeloit Corporation
InventorEdgar J. Justus
Life of this patent
Estimating the term…
Abstract
A web spreading and guiding device to maintain a running paper sheet making foraminous web comprising a wire or pick-up felt transversely taut and straight running in a papermaking machine, has a pair of free running pneumatic tires having their treads in nipping relation to one another to engage a margin of the web in the nip, the tires being carried by an arm which is pivotally biased to effect transverse web stretching bias of the tires on the web margin running through the nip. Generally one of the devices will be mounted to act on one margin of the web and another of the devices on the opposite margin of the web and the devices being cooperatively biased to stretch the web in opposite directions. Means are provided to control the tire bias for correcting any deviations of the web from a straight running path.
Claims17
In a web spreading and guiding device to maintain a running paper sheet making web comprising a foraminous wire or a pickup felt spread and straight running in a papermaking machine:
- a carrying arm;
- a supporting structure;
- means pivotally mounting the arm on the supporting structure adjacent to one margin of the web for swinging adjustment about an axis extending substantially normal to the plane of the web;
- a pair of pneumatic tires;
- means mounting said tires on said arm to rotate freely on axes which extend in a direction substantially parallel and transversely relative to said web;
- said tires having treads in nip relation to one another and engaging said web margin in said nip;
- means for maintaining said tires inflated to effect a desired nip pressure;
- and means for biasing said arm and thereby said tires to effect a nip bias on said margin in a tranverse web spreading direction.
In a web spreading and guiding assembly to maintain a running paper sheet making web comprising a foraminous wire or a pickup felt spread and straight running in a papermaking machine:
- a first spreading and guiding device mounted to act upon one margin of the web;
- a second web spreading and guiding device mounted to act upon the opposite margin of the web;
- each of said devices comprising a pair of rotary tires;
- each said pair of tires being in nip relation to one another and engaging the associated web margin in the nip;
- means mounting said tires to permit web spreading and guiding relative orientation of the tires of the devices;
- means biasing the nipped tires of the first device to effect a spreading action to draw the web toward said first device;
- and means including a web edge sensing control system for adjusting the attitude of the nipped tires of said second device to counteract the bias of the nipped tires of the first device whereby to accomplish straight running of the web and to simultaneously spread the web by virtue of the opposite transverse forces exerted by the nipped tires of the devices.
Dependencies are inferred from the claim text.