Патент USA US2137252код для вставки
Nov.’ 22, ‘1938! 4 F. J. STEVENS ' 2,137,252 ' BOW STRAIGHTENING APPARATUS’ Filed- Aug; "12.v 1936 ' , 2 Sheets-Sheet 1 l'wpen?or fit/((22% Siwezzs 3 ' 2,137,252 Patented Nov. 22, 1938 UMTED STATES2,137,252PATiENT-?i‘Fist \ “v now STRAIGHTENING ~A Frank’J. Stevens, Providence,‘ R. III,‘ assignorj_t_o__ ' Cranston Print Works vCompany, Cranston,‘ ' . Application R. 1., a. corporation‘ August 12, of lthode'lsland" 1936, ,‘Sicrial Napalm ‘\ v 8 Claims. (o1;"26;52f)f ~This invention‘relates to- bow straightening line 4--4<»_of Figure 6,’ through the novel feeding apparatus. Itiis'herein particularly shownv and rolls; described in‘ its application to a tentering‘ ma 1 -- > - 1' l, .l ‘ _ Figure 6Pis~a»f-ront elevation taken as on line 5 chine but this is merely illustrative because it cloth. H ‘Figure. 5 is a plan view; and 5 may be used with any continuously moving strip of " ‘E Figure; -4,.1_-is' a side-elevation, as in section on 6-6 of Figure 2. v ~ ‘ Y Referringgnow-gmore ‘particularly to the draw i In the weaving of fabric the» threads of the ings andespecia'llyto Figure 1, it is highly desir ablefor thetwoverr fabric to remain as indicated 10 at iii-with;v the-woofer ?lling threads B straight woof, called ?lling threads, are laid or woven straight across the warp and it is important 10 that they remain so ‘throughout the subsequent across‘theiwarp threads C. Unfortunately this desired.conditionds-seldom, realized and more often‘ than not ;,the;woofj.threads become curved processing of the goods. It is readily-appreci ated that if these cross threads are laid straight to form a desired pattern and" later become ’ as shown at Bland; atB2. curved, called in the art “bowing”, serious and 15 damaging deformity‘ of the pattern results. Likewise with plain cloth which is to be printed with some design, if the ?lling threads are not straight across when the piece is printed it is well-nigh ruinous to the design if straightening go, of the bowing is later" attempted. ‘And even ' where the cloth is not woven or printed with any ?gurative design, being simply plain goods, itis nevertheless highly desirable to have no bowing , not __only as a matter of appearance but because \ when the goods are ?nally ‘cut to a pattern bow " ing leads to unexpected distortion of therrcloth when it is eventually made up ‘into a garment; It is an object of this invention-to provide means to straighten the bowing of the ?lling 30 threads. Cloth is Woven into long stripsgor pieces As. previously stated the presentinventionris,directed to the straight ening. of suchbowing, Whether the ?lling threads becurvcd asatBl ,. orreversely curved as at B2. A tentering machine affords a most desirable place in theprocessing of cloth for the employ ment of my invention. In a tenter the ‘cloth is stretched sidewise promptly after entering the machinenandgthereafter travels a considerable distance with theselvage engaged by the travel ing clipsof-the machine. .The drawings show the head or delivery end 101’ a tenter with my im 25 proved'lbow eliminating‘means applied thereto. The head end ,comp-rises, side frame members I andlcarrying a-main drive shaft 3 which may be driven from any suitable source of power. Splined to this shaft, and movable therealong, arrebeveledypinions land 51. Each pinion meshes which, during the‘ subsequent processing, ;_are with, a beveled lg'ear?, ‘I, attachedto the lower temporarily stitched together so that the fabric end of a vertical shaft 8, 9, to the upper end of may continue to be fed as a strip. inde?nitely. which is secured a sprocket. gear in; II. Each Generally speaking whenever such a continuous sprocket gear~drives an endless chain l2, l3 in 35 35 strip is being fed it is possible for the bowing to dicatedby the dotéand-dash lines in Figure 5. occur, but it almost invariably occurs whilethe ‘This chain comprises aseries of clips I4, shown in cloth is passing through a tentering'machine. Figure 6, those of one chain gripping one side. of Accordingly ‘the present invention may be em the cloth stripQAV while the. clips of the other ployed particularly with a tentering machine, and chain grip . thev other side, of the strip. The 40 ‘m such use is herein disclosed as the bestmode chains ,extend for a considerable longitudinal in which I have contemplated applying the prin distance, being, guided, by chainrails l6, I‘! from ciples of. my invention. ’ As previously noted, this showing is to be taken as merely illustrative for it is intended that the patent shall 'coverby .57 suitable expression in the appended claims what " ever features of patentablenovelty exist in the invention as a whole. . Figure 1 is a plan view, of several sections of a strip of fabric, showing somewhat diagrammat 50 ically how the bowing may occur; _ Figure 2 is a side elevation of the head or de the cloth receiving end to the. delivery or head end- of the tenter. Asa chain reaches its sprock et gear the. clips are engaged by, an opening‘ ?ange 45 l8, l9 and causedv to open, therebypermitting the cloth ito'tcovn'tinue forward 'asthe chain reverses its direction of travel. The stretched cloth . passes over .abar 20 to, a winder, (not shown) 50 where it is wound on itself into a roll. All of the apparatus thus far described is old livery end of tentering machine to which my de in-vthe art and-is merely representative‘ of any tenter, herein. disclosed as indicating broadly vice has been applied; anymeansv forhfeeding the .edges of a piece of . , ' Figure 3 is a similar elevation of the same, 55 partly in section as on line 3-3 of Figure 6; clcth_.;v Thenovelapparatus will now be described, 55 2 2,137,252 by means of which apparatus any bowing of the ?lling threads may be straightened and the cloth delivered to the winder with these threads posi tioned straight across the strip. Secured to the side frames | and 2 are stand ards 2| , 22 carrying an axle rod 23 to which is secured arms 25, 26 between which is rotatably supported a roll 21. These arms are so-positioned on the rod 23 that the center of the roll 21 will be substantially over the center line of the fabric piece A, whose edges are indicated by dotted lines a, a’ in Figure 5. Beneath the cloth is direction of the arrows, he turns hand-wheel 41 to raise shaft 48 and thereby depress the arms 4|, 25 and 26. This forces the upper roll 21 toward the lower roll 28 and where the non cylindrical surface of the upper roll ?rmly presses the cloth A which is between the rolls against the lower roll, that portion of the cloth will as sume the speed of travel of the surface of roll 28. With the ?lling threads bowed as at Bl in Figure 1, the variable speed device will be set so that the roll 28 is traveling at a greater speed than the cloth. In consequence, as the cloth is gripped by the rolls the portion so gripped will be speeded up and travel forward faster than another roll 28 rotatably supported by arms 29, 30 on standards 3|, 32. The shaft 33 of this 15 lower roll 28 carries a sprocket gear 34 which is connected by chain 35 to a variable speed control ‘ the edges of the strip. Because of the varying device 36 of any suitable design which may, for diameter of the upper roll, the greatest pressure example, be driven by another chain 31 running is exerted on the piece at its middle where the diameter of the upper roll is largest and less between gear 38 and a sprocket gear 39 on the 20 main drive shaft 3. Obviously the speed of chain pressure will be exerted progressively towards the ends of the roll. This variation in pressure re 20 35, gear 34 and roll 28 may be di?erent from that sults in variation in the speed imparted to the. of gear 38 as determined by ‘the setting of the‘ variable speed controller 36. The hand-wheel 40 cloth by the rolls so that the middle portion 'of the piece is speeded up to the greatest extent is representative of any suitable means for de 25 termining the setting of the‘ device 36 and the speed of roll 28. 7' ' ‘ - At one end of the rod 23 is secured‘an arm 4| 30 which is connected by an extended link 42 with a chain or cable 43 running through a housing 44 and around a guide wheel 45 to‘ a vertical shaft 46. The latter is provided with external threads which are engaged by a hand-wheel nut 41 at the upper end of a suitable support 48. By turn , ing this hand-Wheel, shaft 46 may be raised or lowered and, by means of chain 43 and link- 42, the arm 4| may be turned. This will cause the axle rod 23 and arms 25, 26 to likewise turn and either press roll 21 toward roll 28 or move the rolls apart. Secured to arm 4| is a spring mem ber 49 so arranged as to constantly urge arm 4| upward, thus imposing a tension on the chain 43. While it is to be understood that both roll 21 and 28 may be cylindrical rolls, I prefer that one of them shall be non-cylindrical as shown. As 45 illustrated, roll 21 is not a true cylinder but has its greatest diameter at the middle and its small est diameters at the ends. Between these ex tremes of diameter the variation may be gradual and uniform in which case the longitudinal ele 50 ments of the roll surface are straight lines'from the middle to each end. Or the surface may be shaped so that the elements are curved lines, either uniformly so or variably so with the curva ture increasing toward the ends. As here shown, 55 the upper roll 21 has the longitudinal elements of its surface, as straight lines while the lower roll 28 is truly cylindrical, but these relations might be reversed with the upper roll cylindrical and the lower roll of varying diameter. It is also preferable that one of the rolls 21, 28 have a surface which is somewhat yieldable so that as the rolls are moved closer together the extent of engagement of the cloth will be varied. As here shown the upper roll21, represented as 65 being made of a suitable rubber composition, but it might be provided merely with a surface cov ering of such.’ material or other material of yieldable nature. . ‘ As the strip passes the bar 20 and becomes 70 visible to the operator standing beyond the winder (not shown) in the neighborhood of the while toward the ends of the rolls as the pressure between them lessens the cloth is permitted grad 25 ually to slip so that its speed approaches the speed of the edges. This leads to a complete straightening of the bowing and restores the WOOf threads straight across the warp. If the bowing is in the reverse direction, as at 30 B2 in Figure 1, the speed of the roll 28 will be adjusted to less than that of the cloth and as a result the middle portion of the strip will be most retarded with less retardation toward the ends of the rolls. Again the bowing will be eliminated. It is evident that if the bowing is not too great, the necessary variation in speed to be imparted by the rolls can be controlled almost entirely by the hand-wheel 41, but if the bowing should be unusually large, then it is desirable to change the speed of the rolls by means of the variable speed device 36. Such changes are readily-made by the operator while the strip is continuing to travel and as a result the cloth is presented to the winder and wound up thereon with the bow ing eliminated. pressure roll it is to be understood that this roll might also be positively driven, in which event the lower roll could be a pressure roll or driven as shown. Also, the lower roll might be arranged to be moved toward or from the upper roll, but I prefer the arrangement shown. I claim: 1. Apparatus for eliminating bowing in a piece of cloth comprising, in combination, feeding 55 means engaging the edges of said piece and capa ble of positively moving each edge at a predeter mined speed and means for simultaneously en gaging the piece intermediate of its edges and capable of positively moving said piece interme diate of its edges at a speed different from that of the said edges; the said piece being moved in its own plane by the said engaging means. 2. Apparatus for eliminating bowing in a piece 65 of cloth comprising, in combination, feeding means engaging the edges of said piece and ca pable of positively moving each edge at a prede termined speed and means for simultaneously engaging the piece intermediate of its edges and hand-wheel 41, he can readily determine wheth capable of positively moving said piece interme er or not any bowing is present in the cloth. If he ?nds that the cross threads are curved as at diate of its edges at a speed different from that of the said edges; the said piece being moved in 75 Bl in Figure 1, and the cloth is moving in the 45 ~ While I have shown the upper roll 21 as a its own plane by the said engaging means so as to impart the greatest difference in speed to 75 3 2,137,252 that portion of the piece where the bowing is greatest and to impart less difference in speed from said portion toward the edges of the piece.v ' 3. Apparatus for eliminating bowing in a piece of cloth comprising, in combination,, feeding means engaging the edges of said piece and ca pable of positively moving each edge at a prede termined speed and means for simultaneously feeding the piece intermediate of its edges at a 10 speed different from that of the said edges; the last said means comprising a pair of rolls engag ing the piece intermediate of its said edges. 4. Apparatus for eliminating bowing in a piece of cloth comprising, in combination, feeding 15 means engaging the edges of said piece and ca pable of positively moving each edge at a pre determined speed and means for simultaneously feeding the piece intermediate of its edges at a speed different from that of the said edges; the last said means including a cylindrical roll and a non-cylindrical roll having its greatest diam eter substantially at the center line of said piece; one of said rolls having a yieldable surface and there being means for moving said rolls relatively to one another to engage the piece between them. 10' '7. Apparatus for eliminating bowing in a piece of cloth comprising, in combination, feeding means engaging the edges of said piece and ca pable of positively moving each edge at a pre determined speed and means for simultaneously feeding the piece intermediate of its edges at a speed different from that of the said edges; the lastsaid means comprising a'pair of rolls en gaging the piece between them; and means for changing the speed of said rolls to vary the rela 20 tive speed of said edges and the piece intermedi pable of positively moving each edge at a pre determined speed and means for simultaneously feeding the piece intermediate of its edges at a speed different from that of the said edges; the 20 last said means comprising a cylindrical roll and a non-cylindrical roll constructed and arranged its edges. _ to engage the piece intermediate of its said edges. ate8. ofApparatus for eliminating bowing in a piece 5. Apparatus for eliminating bowing in a piece cloth comprising, in combination, feeding of cloth comprising, in combination, feeding ‘of means engaging the edges of said piece and capa 25' ble of positively moving each edge at a prede 25 means engaging the edges of said piece and ca pable of positively moving each edge at a prede termined speed and means for simultaneously termined speed and means for simultaneously ' feeding the piece intermediate of its edges at a feeding the piece intermediate of its edges at a speed different from that of the said edges; the speed different from that of the said edges; the last said means comprising a cylindrical roll and 30 30 last said means comprising a cylindrical roll and a non-cylindrical roll constructed and arranged a non-cylindrical roll constructed and arranged to engage the piece intermediate of its said to engage the piece intermediate of its said edges; the non-cylindrical roll being made of edges; one of said rolls having a yieldable surface yieldable material; and means for moving said and there being means to control the relation of non-cylindrical roll toward or from the other 35 35 said rolls to one another to vary the extent of roll to vary the extent of their engagement with engagement of the piece between them. 6. Apparatus for eliminating bowing in a piece of cloth comprising, in combination, feeding means engaging the edges of said piece and ca the piece. ' FRANK J. STEVENS.