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1785- 13, 1962 l. MOLEOD HILL 3,020,620 BOW STRAIGHTENING DEVICE Filed NOV. 30, 1960 I III. III-I Oln5.ux_s. Luv-WEI’ (am-25. OE.m INVENTOR: IAN MCLEOD HILL BY ATTYS. United States Patet 1 "" Ct? 3,020,620 , Patented Feb. 13, 1962 2 movement between the take-off and take-up mechanisms 3,026,620 BOW STRAIGHTENING DEVICE Ian McLeod Hill, Lurgan, Donacloney, Northern Ire land, assignor of one-half to John Dalgiish & Sons Limited, Thorniiebank, Glasgow, Scotland, a British company Filed Nov. 30, 1969, Ser. No. 72,742 4 Claims. (Cl. 26—51.3) and so disposed relative to said mechanisms as to provide an outward path as indicated by arrow A from the take off mechanism, and a return path as indicated by arrow B to the take-up mechanism. The bow straightening de vice provided at the locus of the change in direction of fabric progressed between the take-off and take-up mecha nisms comprises a transversely-disposed shaft 10 of sub stantially greater length than the maximum width of fabric This invention relates to a device for removing back 10 to be treated and two rollers 11 and 12 of equal length mounted about said shaft and of aggregate length less ward bow in the weft threads if woven fabrics or in than that of the shaft 10 but greater than the maximum width of fabric. The shaft 10 may be stationary and the rollers 11 and 12 adapted to rotate relative to the tively complicated in construction and operation. 15 shaft, but in the embodiment shown the shaft is mount ed at each of its ends to rotate freely in bearings 13 and An object of the present invention is to provide a rela ' 14 supported in a housing 15. The shaft 10 is formed tively simple device for the purpose aforesaid. with a longitudinal groove 'or keyway 16 extending over According to the present invention I provide in or for courses of knitted fabrics. Devices for the purpose aforesaid heretofore have in corporated bent bars and bent rollers and have been rela apparatus including fabric take-off and take-up mecha its entire length and each roller is formed along its in nisms and means for progressing fabric in the direction 20 ner periphery 17 with a longitudinal rib or key 18 ex tending over its entire length and which has a sliding of its length between said mechanisms, a device for the ?t in the keyway 16. Thus the rollers 11 and 12 rotate purpose aforesaid comprising a shaft disposed or adapted with the shaft 10 when the latter rotates in its end bear to be disposed transversely to the line of progress of the ings 13 and 14, and can slide lengthwise of the shaft fabric and in such relation to said mechanisms as to effect a return bend in said line of progress, a pair of rollers 25 towards and away from one another. The rollers are hemispherical at their inner or directly opposing ends mounted about said shaft and having an aggregate width 19, and at their outer or mutually remote ends 20 have exceeding that of the fabric, and means for effecting lat bobbin-shaped extensions comprising a median reduced eral adjustment of said rollers along said shaft each to diameter portion 21 ?anked by flanges 22. The ribs or and from a median position relative to the fabric width, the arrangement being such that if there is a backward 30 keys 18 extend through the extensions. The web W in its progress contacts the roller peripheries and effects a re bow in the fabric the rollers can be adjusted transversely turn bend movement therearound, and in so doing ro thereof each away from the median position to leave a tates the rollers 11 and 12 and shaft 10. gap therebetween whereby the center of the fabric travels Any suitable known means may be provided for trans through a shorter path than the remainder thereof in movement through said return bend thus to remove the 35 verse adjustment of the rollers 11 and 12 along the shaft 10 each to and from the median position where they abut how. or substantially abut one another as shown in FIG. 3. The shaft may be stationary or rotatable, but in either In the embodiment of the invention illustrated (see par case the rollers are rotatable. ticularly FIG. 1) the means for effecting this transverse The rollers may be adjusted lengthwise of the shaft by any suitable means such as a right- and left-hand thread 40 adjustment of the rollers comprises a shaft 23 mounted above and in spaced and parallel relation to the shaft 10 ed rod or shaft disposed parallel to and spaced from the and rollers 11 and 12, the shaft 23 being externally screw roller-mounting shaft and rotatable to displace therealong threaded for some distance from near each end towards towards and away from one another tapped tubes in the center thereof. The threads ‘are of opposite hand, threaded engagement with the opposite-handed threads of the shaft and carrying arms terminating in yokes strad 45 that at the left-hand of the shaft as seen in FIG. 1 being denoted 24 and being a left-hand thread and that at the dling reduced diameter portions of said rollers adjacent right-hand of the shaft as seen in FIG. 1 being denoted the mutually remote ends of the latter. 25 and being a right-hand thread. Theshaft 23 is sup An embodiment of the invention will now be described, ported at its ends in bearings 26 and 27 and is freely by way of example, with reference to the accompanying 50 rotatable, a hand-wheel 28 being secured on one end of drawing in which: the shaft for control of such rotation. Mounted about each threaded portion of the shaft 23 and in screw-threaded engagement with the thread there at is a short tapped tube 29 from which depends an arm 55 30 fashioned at its lower end as a yoke 31 received be 2—-2 of FIG. 1; and tween the ?anges 22 and straddling the reduced diameter FIGS. 3 and 4 are diagrammatic views indicating a web portion 21 between the ?anges. It will be manifest that of fabric passing to and from the device in conditions if the handwheel 28 is rotated in a clockwise direction respectively, where the fabric has no backward bow, and the tubes 29 will move along the shaft 23 towards one where it has a backward bow. FIG. 1 is a front elevational view of a device for re moving backward bow in the weft threads of woven fab rics or in courses of knitted fabrics; FIG. 2 is a schematic sectional view taken on the line Webs of fabric may undergo various kinds of ?nishing treatments and in such treatments it is usual for a web another and the yokes 31 will simultaneously urge the rollers 11 and 12 from the positions shown in full lines in FIG. 1 towards the positions shown in chain-dotted lines in FIG. 1 to bring the hemispherical ends 19 of the of fabric to be progressed in the direction of its length between fabric take-off and fabric take-up mechanisms, rollers 11 and 12 into contact with one another and thus driving means being provided for so progressing the fab ric, which fabric take-off and fabric take-up mechanisms 65 in effect to form the equivalent of a single roller. Like wise, counter-clockwise rotation of the hand-wheel 28 and driving means therefor may be of any preferred or will move the rollers 11 and 12 away from one another conventional construction forming no part of the present leaving a gap therebetween. In operation, if the weft threads of a web W of fabric Referring now to the drawing, the device for remov 70 have a backward bow, as indicated diagrammatically at 33a in FIG. 4, the rollers 11 and 12 are adjusted away ing backward bow in the weft threads of woven fabrics from the median position along the shaft 10, thus to leave or in courses of knitted fabrics is located in the path of invention and, hence, are not shown in the accompanying drawings. 3,020,620 “ i 4 3 a gap therebetween whereby the web of the fabric in its return‘bend movement'travels ‘through a path'which be comes increasingly shorter as the longitudinal center line of the fabric is approached, the selvedges of the fabric travelling about the peripheries of the rollers and the web consequently being bowed in the transverse direction as it effects said return bend movement. As a result the backward bow is corrected and the weft threads or shaft each to and from a median position relative to the fabric width, whereby if there is a backward bow in the fabric the rollers can be adjusted transversely thereof each away from the median position to leave a gap therebe tween whereby the center of the fabric travels through a shorter path than the remainder thereof in movement through said return bend thus to remove the bow. 2. A device as claimed in claim 1, in which the rollers are freely rotatable. courses are straightened, as indicated diagrammatically 3. A device as claimed in claim 1, in which the shaft at 33b in FIG. 4, when the web travels up to the direc 10 is freely rotatable and the rollers are keyed to the shaft tion-changing roller 32. When there is no bow, as indi for rotation therewith. 4. A device as claimed in claim 1, wherein said means adjusted back to the median position to place them close for effecting lateral adjustment of ‘said rollers along said together and to provide in effect a single continuous roller. Manifestly changes in details of construction can be 15 shaft comprises a right- and left-hand threaded rod dis posed parallel to and spaced from the roller-mounting effected without departing from the spirit and scope of shaft, tapped tubes in threaded engagement with the op the invention. posite hand threads, said rod being rotatable to displace I claim: cated diagrammatically at 34 in FIG. 3, the rollers are 1. A device for removing backward bow in ‘the weft therealong towards and away from one another said threads of woven fabrics or in courses of knitted fabrics 20 tapped tubes, arms on said tubes terminating in yokes, being progressed in a lengthwise direction, comprising a shaft disposed transversely to the line of progress of the fabric to effect a return bend in said line of progress, a pair of rollers mounted on said shaft and having an aggregate Width exceeding that of the fabric, and means for e?ecting lateral adjustment of said rollers along said said rollers having reduced diameter portions adjacent the mutually remote ends thereof, said yokes straddling said reduced diameter ‘portions. No references cited.