摘要:
A driven feed roller is disposed above a pair of needle chains. Members for spreading the web edges are located immediately preceding the feed roller, and a pair of needling rollers for impaling the web edges on the needle chains are located immediately following the feed roller in the direction of web movement. A device for sensing the web edges is arranged to scan the web edges on the feed roller.
摘要:
Apparatus includes plural expander or guide heads adjacent opposite edges of fabric web material to be guided, with a drive between two or more expander heads for simultaneous adjustment of one by another for movement of the expander heads in and out of the fabric path or varying the cant angles. Remote controls may also be provided and operated either automatically or manually to effect such adjustments of the expander heads.
摘要:
An apparatus for aligning one longitudinal side edge of a thickened portion of a traveling web having both thickened and thinned portions along a substantially constant line of travel. The apparatus comprises a sensing head means for sensing a deviation in the line of travel of one longitudinal side edge of the thickened portion and a switch means for constantly actuating guide means responsive thereto for constantly laterally shifting the traveling web to compensate for the deviations in the line of travel of the one longitudinal side edge of the thickened portion from the desired substantially constant line of travel.
摘要:
A web shifting device, for accurately and instantaneously correcting deviations in the lateral position of a longitudinally travelling web from a normal position, including a sensing device having opposed fluid flow apertures, defining one or a plurality of fluid flow paths which are normally partially restricted by the edge of the moving web, a proportional fluid amplifier controlled by the pressures developed by variations of fluid flow in the apertures caused by the displacement of the edge of the web, and motor means controlled by the amplifier and driving a laterally movable web guide to maintain the web in its normal position.