US3839767A - Apparatus for straightening fabric - Google Patents

Apparatus for straightening fabric Download PDF

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Publication number
US3839767A
US3839767A US00243385A US24338572A US3839767A US 3839767 A US3839767 A US 3839767A US 00243385 A US00243385 A US 00243385A US 24338572 A US24338572 A US 24338572A US 3839767 A US3839767 A US 3839767A
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Prior art keywords
fabric
speed
detecting
engaging
distortion
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US00243385A
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English (en)
Inventor
F Leitner
W Griffin
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COLTRON IND
COLTRON IND INC US
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COLTRON IND
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Priority to US00243385A priority Critical patent/US3839767A/en
Priority to IT49206/73A priority patent/IT982943B/it
Priority to NL7304906A priority patent/NL7304906A/xx
Priority to GB1727073A priority patent/GB1420360A/en
Priority to JP48041192A priority patent/JPS497591A/ja
Priority to DE2318243A priority patent/DE2318243C2/de
Priority to CH525773A priority patent/CH560274A5/xx
Priority to FR7313301A priority patent/FR2180390A5/fr
Application granted granted Critical
Publication of US3839767A publication Critical patent/US3839767A/en
Priority to US05/659,935 priority patent/USRE29267E/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06H—MARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
    • D06H3/00—Inspecting textile materials
    • D06H3/12—Detecting or automatically correcting errors in the position of weft threads in woven fabrics
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C2700/00—Finishing or decoration of textile materials, except for bleaching, dyeing, printing, mercerising, washing or fulling
    • D06C2700/10—Guides or expanders for finishing

Definitions

  • FIG. 1 is a schematic side elevation of a tenter equipped with one embodiment of novel'apparatus for carrying out the method of this invention
  • FIG. 2 is an elevation looking at the egress or right-' hand end of the tenter shown in FIG. 1;
  • FIG. 3 is an enlarged fragmentary elevation looking I rearwardly substantially along line 3-3 in FIG. 1;
  • Another object of the invention is to provide a method and means for correcting skew distortions in a fabric in its course through atenter wherein the forward speed of both side edge portionsof the fabric is varied, each relative to-theother, to correct the skew distortions 'withoutaltering the mean rate of speed of the fabric through the tenter.
  • a fabric is tensioned laterally between a pair of forwardly driven fabricengaging members or tenter chains, and skew and/or bow distortions therein are detected.
  • the forward speeds of both fabricengaging members are varied proportionally relative to each other to reduce and increase the forward speeds of the respective one and opposite side edge portions of the fabric for correcting the skewed condition thereof without altering the mean speed of the fabric moving with the fabric-engaging means.
  • the speed of a stripper roll means located adjacent to the egress end of the tenter, is varied relative to the mean forward speed of the fabric-engaging means so as to compensatively stretch or relax the central portion of the fabric longitudinally between the two fabricengaging means and thereby to correct the bowed condition in the fabric.
  • FIG. 4 is an enlarged fragmentary plan view of the first embodiment of drive means for the stripper roll means and the tenter chains, taken substantially along line 4-4 in FIG. 1, but omitting the tenter chains and with other parts broken away for purposes of clarity;
  • FIG. 5 is a vertical sectional view through one of several differential units taken substantially along line 5-5 in FIG. 4;
  • FIG. 6 is a schematic perspective view of a second embodiment of drive'mechanism for the stripper roll means and tenter chains of the tenter;
  • FIG. 7 is a somewhat schematic, enlarged, perspective view of the differential units and related drive means disposed within the housing shown in the lower central portion of FIG. 6;
  • FIG. 8 is a vertical sectional view through one of. the differential units as used in the second embodiment of the drive mechanism, and being taken substantially along line 8-8 in FIG. 7.
  • each of the two embodiments of apparatus for carrying out the method of this invention is shown in combination with a tenter provided with the usual pair of elongate, laterally spaced, fabric-engaging means or endless tenter chains 10, 10a.
  • Tenter chains 10, 10a may be of any well known type having longitudinally spaced pins, tenter clips or other holding means 11 for successively receiving, holding and then releasing the opposing side edge portions of fabric F laterally; tensioned or stretched between and moved forwardly by tenter chains 10, 10a.
  • Opposing reaches of tenter chains 10, 10a may be up to 60 feet or morein length, and they may be mounted on the usual supporting sprockets, only the front sprockets 13, 13a being shown in FIGS. 2 and 6.
  • mea s are provided for driving tenter chains 10, a at a constant mean forward speed while proportionally oppositely varying the forward speed of the tenter chains 10, 10a relative to each other to correct corresponding skew distortions in the courses of the fabric so that the overall rate of forward travel of the fabric through the tenter is substantially constant atall times during operation of the tenter. Also, in order that the fabric F is of the desired density, within prescribed limits, it is desirable to control precisely the rate at which the fabric is being fed to and stripped from tenter chains 10, 10a in accordance with the mean forward speed of tenter chains 10, 10a.
  • tenter chains 10, 10a and stripper rolls 20, 21 are driven by a common, constant speed, main drive shaft or rotary input element 30 driven by any suitable motive means shown schematically at 31 in FIG. 4.
  • Main drive shaft 30 extends transversely of the tenter and is journaled in a plurality of spaced bearing blocks 32 carried by posts 33 (FIG. 1) secured to or formed intergral with a base plate 34.
  • Main drive shaft 30 serves to drive the rotary input portions of three differential units or-planetary transmissions, namely, first, second, and third differential units 36, 36a, and 37.
  • the first and second dif-, ferential units serve as speed variators for the respec-: tive tenter chains 10, 10a, and the third differential unit
  • main drive shaft 30 supports and 1 extends through all three differential units 36, 36a, 37,
  • differential unit 360 since they may be of the same construction only differential unit 360 is shown in detail with reference to FIG. 5.
  • Each differential unit 36, 36a, 37 comprises an inner or axial sleeve or hub 40 keyed or otherwise secured on main drive shaft 30 and serving as the rotary input portion of the differential unit.
  • a rotary output portion or output hub 41 is rotatably mounted on one end portion of input sleeve 40 and has a corresponding output pulley 42 thereon for rotation with hub 41 and loosely encircling rnain drive shaft 30.
  • Input and output sun gears 40a, 41a are fixed on the tionship and mounted on acornmonshaft 45 carried by housing 43 so that gears 43a, 43b may orbit sun gears 40a, 41a during rotation of housing 43.
  • planetary gear means normally transmits constant speed rotation from input portion 40 to output portion 41, but if housing 43 is rotated, the speed of output portion 41 is varied accordingly, as is usual in planetary gear systems.
  • Means are provided for rotating each housing 43 forwardly and rearwardly alternatively and at relatively slow speed with respect to the direction of rotation and speed of drive shaft 30 to correspondingly reduce and increase, respectively; the
  • each housing 43 is provided with a plurality of peripheral grooves 430 for receiving corresponding endless belts.
  • the housing 43 of differential units 36, 36a, 37 are engaged by respective pairs of endless belts 46, 46a, 47 also mounted on respective pulleys 50, 50a. 5l.
  • Pulley 50 is fixed on a shaft 53 journaled in bearings 54 carried by a gear box 55 fixed to base plate 34 (FIG. 3).
  • Electric motor 61 is suitably secured on base plate 34, and electrical conductor means 62 extends from motor 61 to a suitable skew and bow detecting means broadly designated at 63 (FIG. 1).
  • Detecting means 63 is positioned adjacent the path of fabric movement and is capable of detecting and transmitting electrical signals reflecting either bow or skew fabric distortions or combinations thereof; As preferred, particularly in the processing of knitted fabrics, detecting means 63 is positioned adjacent the lightly tensioned, substantially relaxed or catenary portion of the fabric F below front stripper roll 21.
  • Certain elements of the detecting means are mounted for scanning movement adjacent the fabric path, such as a pair of scanning discs 63a, 63b which cooperate with respective light source means 63c, 63d located on the opposite sideof the fabric F from the respective scanning discs 63a, 63b.
  • the detecting means 63 may be of a type such as that disclosed in U.S. Pat. Nos. 3,192,595 and 3,193,688, the disclosures of which are incorporated herein by reference. Accordingly, a further more detailed description of the construction and operation of the detecting means 63 is deemed unnecessary.
  • photoelectric receiver means is operatively associated with the respective scanning discs 63a, 63b of FIG. 2 of this application and transmits skew correction and/or bow correction signals, via the electrical conductor means 62, to the skew correction control motor 61 and/or to a reversible bow correction control motor 65 (FIG. 4) in accordance with the fabric distortions detected by detecting means 63.
  • Bow correction motor 65 is shown in FIG. 4 in the form of a gear motor on the output shaft of which pulley 51 is secured. Motor 65 is suitably secured on base plate 34.
  • the arrangement is such that, when the courses of fabric F passing the scanning discs 63a, 63b (FIG. 2) are substantially straight and perpendicular to the fabric path, a balanced condition exists in the associated receiver means so that the motors 61, 65 are inactive.
  • detecting means 63 detects a skew distortion in the fabric F in which the right-hand side edge portion or selvage of the fabric, as viewed in FIG. 2, is skewed forwardly of the left-hand side edge portion or ,selvage thereof,'the normally inactive skew correction motor 61 is activated to rotate in a forward direction.
  • skew correction motor 61 is activated to rotate in the opposite or reverse direction.
  • the norrotate in a forward direction when the central portion of the fabric is bowed forwardly of or leads theopposing side edge portions thereof and bow correction motor 65 is activated to rotate in the opposite or reverse direction when the medial portion of the fabric F is bowed rearwardly or lags with respect to the opposing side edgeportions or selvages thereof.
  • housings 43 of the first and second differential units 36, 36a are driven to rotate in opposite directions with respect to each other, and at the same speed with respect to each other, only at such times that skewed distortions in fabric F are being detected by detecting means 63.
  • housing 43 of third differential unit 37 is driven to rotate in one direction or the other only at such times that bowed distortions in. fabric Flare being detected by detecting'means 63. Whenever the three housings 43'are at a standstill, it is apparent that the pulleys 42 of all of the differential units 36, 36a, 37 rotate in the same direction and at the same constant angular speed.
  • the output pulley 42 of third differential unit 37 is drivingly connected to stripper rol-ls 20, 21 by means of an endless belt 80 mounted on pulley 42 of differential unit 37 and also mounted on a pulley 81 fixed on a jack shaft 82.
  • Suitable belt and-pulley means 83 drivingly connects jack shaft 82 to the input shaft of a suitable speed variator or variable speed drive mechanism 86 of any well known type provided with a manually operable regulator means or handle 86a for controlling the output speed of speed variator 86 to obtain the optimum rate of rotation of stripper rolls 20, 21.
  • the output shaft of speed variator 86 is drivingly connected to the outer end of one reduced end portion of front stripper roll 21 by a suitable sprocket and chain or pulley and belt means 87,'and suitable gear means 90 drivingly connects front stripper roll 21 to rear stripper roll 20 so that both stripper rolls 20, 21 rotate at the same surface speed during operation of the tenter.
  • detecting means 63 (FIG. 1) is located downstream of stripper rolls 20, 2 1 in the region in which the fabric isrelaxed or under minimal tension
  • detecting means 63 may be located in the region of tenter chains 10, 10a. In the latter instance, it is preferred that the detecting means. is located upstream of and adjacent the front end portions of tenter chains 10, 10a and forwardly of cooling means 15. It has been determined that skew distortions in the fabric. are corrected more efficiently when the detecting means islocated upstream of and adjacent the front end portions of tenter chains 10, 10a than is the case when detecting means 63 is located downstream of stripper rolls 20, 21as shown in FIGS.
  • Jack shafts 66, 66a are disposed adjacent and forwardly of the main drive shaft and have respective pulleys 71, 71a fixed thereon and engaged by endless belts 72, 72a. Endless belts 72, 72a also engage pulleys 42 of the respective first and second differential units 36, 36a.
  • the rear jack shafts 66, 66a are drivingly connected to front jack shafts 67, 67a by respective under which it will be deliveredto a customer. In any event, it has been determined that bow distortions in the fabric are corrected more efficiently when the detecting means '63 is located in the position of FIGS. 1 and 2. i
  • two detecting means may be used with one detecting means occupying the position of detecting means 63 in FIGS. 1 and 2 for controlling bow correction'motor 65 only, and with another detecting means located upstream ofand adjacent the front end portions of tenter chains 10, 10a for detecting skew distortions only in thefabric and thus only controlling skew correction motor 61.
  • An illustration of the latter arrangement is.deemed unnecessary. From the standpoint of economy, it is preferred that 'only a single detecting means is used for controlling bothmotors 61, 65 and it has been determined that, if both motors 61, 65 areto be controlled by a common detecting case when the detecting means is positioned upstream of the front ends. of tenter chains 10, 10a.
  • main drive shaft 30 in FIG. 4 rotates at a constant speed during operation of the tenter.
  • the guide rolls 22, -23 (FIGS. 1 and 2) also serve as delivery means for the fabric and are driven at such surface speed relative to that of stripper rolls 20, 21 that minimal tension is applied to the fabric passing between the front stripper roll 21 and guideroll 22.
  • the shaft of stripper roll 21 is drivingly con nected to guide roll 23 by suitable pulley and belt connections 92 (FIG. 2), and suitable gear means 93 drivingly connects guide roll 23 to guide roll 22.
  • guide roll 22 may be in the form of a dancing roll of relatively light weight and simply resting upon and forming a loop in the fabric F, in which instance roll 22 would not be driven.
  • a skew correction signal is transmitted from detecting means 63 to activate and cause skew correction motor 61 to rotate in a forward direction.
  • This rotates housing 43 of first differential unit 36 in a forward direction corresponding to the direction of rotation of main drive shaft 30.
  • housing 43 of second differential unit 36a rotates in a reverse direction with respect to, and at the same speed as, housing 43 of first differential unit 36.
  • the rate of rotation of the latter housings 43 may be such as to reduce the output speed of first differential unit 36 by about one-half to 2 percent as the output speed of second differential unit 36a is increased by the same amount, depending upon various factors, such as the length of the tenter, the speed of tenter chains 10, 10a, the width of the fabric F and the type of fabric being processed.
  • the forward speed of righthand tenter chain 10 is reduced a predetermined amount relative to its normal speed simultaneously with which the forward speed of left-hand tenter chain 10a in FIG. 2'is increased by the same amount to straighten the skew distortion in the fabric F throughout the effective length of tenter chains 10, 10a and until a skew distortion in the fabric F is no longer detected by detecting means 63.
  • the mean forward speed of tenter chains 10, 10a remains constant; i.e. the longitudinal central or medial portion of the fabric continues to move at a constant speed as determined by the speed of rotation of main drive shaft Upon detection of a skew distortion by detecting means 63, in which the left-hand side edge portion of fabric F, as viewed in FIG.
  • bow correction motor receives a bow correction signal from detector means 63. If a forward bow distortion is then being detected by detecting means 63, the signal received by how correction motor 65 causes the same to rotate in a forward direction to impart forward rotation to housing 43 of third differential unit 37.
  • feed roll means 16 is driven by a drive mechanism broadly designated at and comprising a constant-speed drive shaft or input element 101 driven by suitable connections with a motive means 102.
  • Sensing device 113 may be of any well known type which will detect variations in density, including courses or picks per unit length, with respect to a predetermined normal number of courses or picks per unit length of the fabric-Thereare many known forms of sensing devices capable of producing control signals when the courses, picks or other density characteristics of a fabric varyabove or below a predetermined normal density-condition of the fabric. Accordingly, a detailed illustration and description of sensing device 113 vis deemed unnecessary.- By way of example, sensing de- I tenter chains, stripper rolls and guiderolls bear .the
  • FIGS. 6,7, and 8 differs from the first embodiment of FIGS. l -S in that the first, second and third differential units 36', 36a, 37' are not mounted on a common main drive shaft, as in FIG.
  • latervice 113 may be of a type such as is distributed by Mahlo-American, lnc., Post-Office Box 1352, Spartanburg, South Carolina 29301 and which is known as The Mahlo FMIR-l.
  • drive shaft 101 drives feed roll means 16 at a constant speed through the output portion ofdifferential unit 103 and through speed variatorl04.
  • motor 107 drives the housing of differential unit 103 in a forward direction, corresponding to the normal direction of rotation of drive shaft 101, but at a slower speed than shaft 101.. In so doing, the output portion of differential unit 103 is reduced to correspondingly reduce the speed of feed roll means l6'to a predetermined extent.
  • Differential units 36', 36a, 37 maybe substantially identical, with the exception of the respective output shafts upon which they are mounted Accordingly, only differential .unit 36a is shown in detail in FIG. 8 wherein it will be observed that elements 40, 40a, 41', 41a, 43', 43a, 43b and'45 in FIG. 8 may be identical to corresponding elements shown in FIG. 5, with the important exception that.
  • axial sleeve or hub'40 serves as the output portion of differential unit 36a, and hub 41 servesas the input portion of differential unit 36a.
  • Each input'hub 41 ' has a sprocket 42' secured thereon exteriorly of housing 43', and allof the sprockets 42 are engaged by a common endless sprocketi chain 123 which engages a'sprocket 124 fixed on 'main drive shaft 30' (FIG. 7).
  • Secured to or formed integral with housings 43' of differential units 36', 36a, 37 are respective peripherally disposed worm gears 125, 125a, 126 which are engaged byrespec tive spiralgears or worms 130, 130a, 131.
  • Upper and lower control shafts 132, 133 are journaled in housing 122, and upper control shaft 132 has the worms 130, 130a fixed thereon.
  • Lower control shaft'133 has worm 131 fixed thereon.
  • the lead direction of the threads or teeth of worm 130 is opposite from that of worm 130a so that, during rotation of shaft 132 in either directionQhousings 43' of differential units 36, 36a rotate in opposite directions at the same angular speed; relative to each other.
  • Corresponding ends of control shafts 1 32, 133 are conential units 36', 36a are drivingly connected to the respective shafts 67, 67a, as by means of suitable sprocket and chain connections 136, 136a, respeclow density condition of the fabric has been corrected I and is no longer being sensed by sensing device 113.
  • FIGS. 6, 7, and 8 wherein the tively, for driving the respective tenter chains 10, 10a in essentially the same manner as that described with respect to the first embodiment of the invention. Also,
  • output shaft 121 of third differential unit 37' is coupled to or formed integral with shaft 82' for driving stripper rolls 20, 21 and guide rolls 22,23 of FIG; 6'in essentially the same manner asthat described with'respect to the first embodiment of the invention.
  • Control motors 6l',65' of the second embodiment of the invention are operatively connected to the detecting means 63 in the manner heretofore described with respect to the first embodiment of the invention.
  • the drive mechanism of the second embodiment of the invention functions in a manner quite similar to that of the first embodiment of the invention and, therefore, a detailed description of -the operation of the second embodiment of the in earthicated, since main drive shaft 30' transmits substantially constant speed rotation to the input hubs 41' of all three differential units 36, 36a, 37 it follows that the output shafts 120, 120a, 121 normally rotate at a substantially constant speed, and when control motors 61, 65' drive the respective shafts 132, 133 for correcting respective skew and bow distortions in the fabric on the tenter, it is apparent that rotation of the housings 43 thus being effected varies the speed of the respective output shafts 120, 120a, 121,.accordingly.
  • a tenter having a pair of laterally spaced, elongate and longitudinally movable first and second fabricengaging tenter chains for moving a fabric forwardly while applying lateral tension to the fabric therebetween', the combination therewith of a. tenter chains for driving said fabric-engaging means to move at least the longitudinal center of thefabric therebetween at a predetermined substantially constant lineal speed and including a rotary input element adapted to be driven forwardly at a constant speed,
  • detecting means for detecting and producing a signal in response to a skew distortion in the forwardly moving fabric in which one side edge portion of the fabric is skewed forwardly of the opposite side edge portion thereof
  • responsive means interposed in said driving means and responsive to a skew correction signal of said detecting means for oppositely varying the lineal speed of said pair of fabric-enging tenter chains in direct proportion to each other to correct the skew distortion without altering said constant lineal speed of the longitudinal center of the fabric, said responsive means comprising 1.
  • first and second differential units including respective first and second rotary input portions driven by said input element, first and second rotary output portions on the respective first and second differential units drivingly connected to the respective first and second tenter chains, said first and second differential units also including first and second normally stationary rotary housings, planetary gear means in each housing, and sun gears fixed on the input portion and the output portion, respectively, of each differential unit and meshing with the respective planetary gear means whereby each output portion is driven at a constant speed by said rotary input element while the respective housings are stationary, and
  • reversible means under control of said detecting means for rotating said first and second housings simultaneously in opposite directions relative to each other whereby, when either housing rotates in a forward direction, the speed of the output portion of the respective differential unit is reduced and the other housing is rotated in a reverse direction to increase the speed of the output portion of the other differential unit.
  • said input element includes a drive shaft extending through and supporting both of said first and second differential units thereon, and means securing said first and second rotary input portions on said drive shaft.
  • said reversible means comprises a reversible electric motor, common to both of said first and second housings and being electrically connected to said detecting means. and transmission means for transmitting rotation from said motor to said first and second housings simultaneously in opposite directions relative to each other upon said detecting means detecting a skewed distortion in the fabric.
  • first and second differential units are arranged with the axes of their respective housings disposed in laterally spaced, substantially parallel relationship, said input element comprising a drive shaft disposed in spaced substantially parallel relation from said housings, and driving connections between said drive shaft and the input portions of said first and second differential units.
  • Apparatus according to claim 1 including a. advancing means driven by said drive means for engaging the width of the fabric and advancing the same. forwardly away from said fabric-engaging tenter chains,
  • said detecting means including means for detecting a bowed distortion in the forwardly moving fabric
  • a third differential unit comprising 1. a third rotary input portion driven by said input element,
  • a third normally stationary rotary housing having planetary gear means in said housing, and sun gears fixed on the input portion and output portion, respectively, and meshing with the planetary gear means for normally transmitting substantially constant-speed rotation from said third input portion to said third output portion while the housing is stationary, and
  • additional reversible means responsive to said detecting means detecting a bowed distortion in the fabric for driving said third housing in a direction corresponding to the direction of the bowed distortion being detected to vary the speed of said advancing means to thereby correct the bowed distor- I tion'in the fabric.
  • a tenter having a pair of laterally spaced, elongate and longitudinally movable first and second fabricengaging means for moving a fabric forwardly while applying lateral tension to the fabric therebetween;
  • detecting means for detecting and producing a signal in response to a skew distortion in the forwardly moving fabric in which one side edge portion of the fabric is skewed forwardly of the opposite side edge portion thereof and for detecting and producing a bow correction signal in response to a bowed distortion in the forwardly moving fabric
  • first responsive means interposed in said driving means and responsive to a skew correction signal of said detecting means foroppositely varying the lineal speed of said pair of fabric-engaging means in direct proportion to each-other to correct the skew distortion without altering said constant lineal speed of the'longitudinal center of the fabric, and
  • .second responsive means interposed in saiddriving means and responsive to a bow correction signal of said detecting means in which the central portion of the fabric is lagging or leading the opposite side edge portions'thereof, for compensatively varying the speed of said advancing means to correct the bowed condition of the fabric.
  • Apparatus according to claim means for compensatively varying the speed of said advancing means comprises a. a speed variator having l.a driven rotary input portion,
  • drive means drivingly connected to and normally imparting substantially constant forward lineal speed to said pair of fabric-engaging means and in cluding a rotary input element adapted to be driven forwardly. 'at a constant speed,
  • detecting means responsiveto detection of skew distortions in the fabric for producing skew correcsubstantially constant-speed rotation to said output portion from said inputportion
  • a normallyinactive reversible electric motor responsive to said skew correction signals for rotating one of said rotary members-in that direction required to correct a corresponding skew distortion in the fabric and simultaneously rotating the other of said rotary members in the opposite direction from said one of said rotary members, so that, when either housing rotates in a forward direction, the speed of the output portion of the'same differential unit is reduced as the other housing rotates in a reverse direction to increase the speed of the output portion of the respective other differential unit whereby whenever the speed of either fabricengaging means is increased to correct a skewed distortion in the fabric, the speed of the other fabr ic-engaging means is correspondingly reduced, such that the sum of the speeds of the two fabricengaging means is equal .to said constant forwardspeed to'thereby vary the forwardspeed of opposite side edge portionsof thefab
  • each differential unit including 1. an input portion driven by said input element
  • reversible means for, at times, rotating both of said rotary members. simultaneously in opposite direction of the respective other differential unit whereby whenever the speed of either fabricspaced, elon-.
  • the speed of the other fabric-engaging means is correspondingly reduced, such that the sum of the speeds of the two fabricengaging means is equal to said constant forward speed to thereby vary the forward speed of opposite side edge portions of the fabric for correcting a skewed distortion thereof without altering the means forward speed of the fabric,
  • bow'correction means including advancing means for advancing the fabric forwardly away from said fabric-engaging means and having an additional differential unit also comprising 1. an input portion driven by said input element, 2. an output portion drivingly connected to said advancing means, and
  • a normally inactive reversible electric motor responsive to said bow correction signals for rotating said additional rotary member in that direction required to alternatively increase and decrease the speed of said advancing means for correcting bowed distortions in the fabric.
  • a tenter having a pair of laterally spaced, elon gate and longitudinally movable first and second fabricengaging means for moving a fabric forwardly while applying lateral tension to the fabric therebetween; the combination therewith of a. means for feeding fabric to said fabric-engaging means,
  • control means for said feeding means including 1. sensing means adjacent said fabric-engaging means for sensing variations in density of forwardly moving fabric; and
  • detecting means for detecting and producing a signal in response to a skew distortion in the forwardly moving fabric in which one side edge portion of the fabric is skewed forwardly of the opposite side edge portion thereof,
  • delivery means disposed on the opposite side of said advancing means from said fabric-engaging means and in spaced relation to said advancing means and adapted to receive the corrected fabric from the advancing means and to continuously deliver the fabric therefrom,
  • said detecting means being positioned between said advancing means and said delivery means adjacent the path of fabric movement therebetween for detecting skew distortions in the fabric while in relaxed state
  • drive means connected to said advancing means and said delivery means for continuously driving the same at lineal speeds sufficient to advance the corrected fabric past said detecting means under minimal tension whereby the corrective action on the fabric is substantially improved.
  • control means further comprises a drive shaft adapted to be driven at a constant speed
  • means responsive to said sensing means comprises a. a differential gear unit including 1. an input portion operatively connected to and driven by said drive shaft,
  • reversible means responsive to said sensing means sensing other than a predetermined normal density of the fabric for rotating said housing in a direction required to vary the rate of feed of the fabric to re turn the same to said normal density.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
US00243385A 1972-04-12 1972-04-12 Apparatus for straightening fabric Expired - Lifetime US3839767A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US00243385A US3839767A (en) 1972-04-12 1972-04-12 Apparatus for straightening fabric
IT49206/73A IT982943B (it) 1972-04-12 1973-04-03 Dispositivo e procedimento per spianare tessuti
NL7304906A NL7304906A (enrdf_load_stackoverflow) 1972-04-12 1973-04-09
GB1727073A GB1420360A (en) 1972-04-12 1973-04-10 Method and apparatus for straightening fabric
JP48041192A JPS497591A (enrdf_load_stackoverflow) 1972-04-12 1973-04-11
DE2318243A DE2318243C2 (de) 1972-04-12 1973-04-11 Verfahren und Vorrichtung zum Breitstrecken und Korrigieren von Stoffbahnen
CH525773A CH560274A5 (enrdf_load_stackoverflow) 1972-04-12 1973-04-11
FR7313301A FR2180390A5 (enrdf_load_stackoverflow) 1972-04-12 1973-04-12
US05/659,935 USRE29267E (en) 1972-04-12 1976-02-20 Apparatus for straightening fabric

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US00243385A US3839767A (en) 1972-04-12 1972-04-12 Apparatus for straightening fabric

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/659,935 Reissue USRE29267E (en) 1972-04-12 1976-02-20 Apparatus for straightening fabric

Publications (1)

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US3839767A true US3839767A (en) 1974-10-08

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US00243385A Expired - Lifetime US3839767A (en) 1972-04-12 1972-04-12 Apparatus for straightening fabric

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US (1) US3839767A (enrdf_load_stackoverflow)
JP (1) JPS497591A (enrdf_load_stackoverflow)
CH (1) CH560274A5 (enrdf_load_stackoverflow)
DE (1) DE2318243C2 (enrdf_load_stackoverflow)
FR (1) FR2180390A5 (enrdf_load_stackoverflow)
GB (1) GB1420360A (enrdf_load_stackoverflow)
IT (1) IT982943B (enrdf_load_stackoverflow)
NL (1) NL7304906A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346621A (en) * 1978-09-07 1982-08-31 Automated Energy Systems, Inc. Power transmission apparatus
US4788756A (en) * 1987-01-22 1988-12-06 Leitner Sr Frank W Apparatus for straightening bow in fabric in a tenter frame
US4894891A (en) * 1987-01-21 1990-01-23 Mahlo Gmbh & Co. Kc Apparatus for measuring the weft thread position and for aligning the weft thread in textiles
US5142751A (en) * 1990-03-31 1992-09-01 Tsuchiya Machinery Co., Ltd. Weft straightener
WO2002092476A1 (fr) 2001-05-11 2002-11-21 Nitta Corporation Convoyeur a bande a billes

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Publication number Priority date Publication date Assignee Title
FR2451876A1 (fr) * 1979-03-21 1980-10-17 Domisse Ets Dispositif de redressement de panneaux de tissu, notamment de panneaux tricotes et son application a une installation de vaporisage de tels tissus
US4899425A (en) * 1986-11-14 1990-02-13 Mahlo Gmbh & Co. Kg. Apparatus for straightening weft yarns in fabrics
DE3715086A1 (de) * 1986-11-14 1988-05-26 Mahlo Gmbh & Co Kg Verfahren und vorrichtung zum richten von schussfaeden in geweben
DE3638909C1 (de) * 1986-11-14 1987-09-17 Mahlo Gmbh & Co Kg Verfahren und Vorrichtung zum Richten von Schussfaeden in Geweben
IT1238717B (it) * 1990-04-27 1993-09-01 Perini Navi Spa Ribobinatrice con mezzi per variare il numero di perforazioni avvolte su ciascun rotolo in formazione
CN111851040A (zh) * 2020-08-24 2020-10-30 常州宏大智能装备产业发展研究院有限公司 织物整纬或整纬整花装置及方法
CN111851039A (zh) * 2020-08-24 2020-10-30 常州宏大智能装备产业发展研究院有限公司 一种织物整纬或整纬整花装置及方法
CN111851041A (zh) * 2020-08-24 2020-10-30 常州宏大智能装备产业发展研究院有限公司 织物整纬或整纬整花系统及方法
CN113174739A (zh) * 2021-05-28 2021-07-27 常州宏大智能装备产业发展研究院有限公司 织物矫正方法及整纬机

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GB370189A (en) * 1931-04-08 1932-04-07 Mather & Platt Ltd Improvements relating to cloth stentering machines
US2106612A (en) * 1935-08-06 1938-01-25 Gen Electric Straightener for woven material
US2233644A (en) * 1939-06-10 1941-03-04 R L Sjostrom Weft straightening device
US2209220A (en) * 1939-06-29 1940-07-23 Gen Electric Weft straightener
US2311406A (en) * 1942-03-24 1943-02-16 Gen Electric Measuring lengths and correcting skew and bow in woven material
US2966593A (en) * 1957-04-02 1960-12-27 Leimer Albert Method and apparatus for inspecting the structure of fabrics
US3169193A (en) * 1960-03-26 1965-02-09 Barr & Stroud Ltd Photosensitive apparatus for sensing the orientation of fine mesh material
US3146511A (en) * 1960-09-12 1964-09-01 Frederick W Hoffman Weft-straightening apparatus and method
SU150429A1 (ru) * 1961-10-20 1961-11-30 А.Т. Рощенко Привод клулпных цепей сушильно-ширильных машин
US3402443A (en) * 1966-05-09 1968-09-24 Coltron Ind Cloth straightening apparatus
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346621A (en) * 1978-09-07 1982-08-31 Automated Energy Systems, Inc. Power transmission apparatus
US4894891A (en) * 1987-01-21 1990-01-23 Mahlo Gmbh & Co. Kc Apparatus for measuring the weft thread position and for aligning the weft thread in textiles
US4788756A (en) * 1987-01-22 1988-12-06 Leitner Sr Frank W Apparatus for straightening bow in fabric in a tenter frame
US5142751A (en) * 1990-03-31 1992-09-01 Tsuchiya Machinery Co., Ltd. Weft straightener
WO2002092476A1 (fr) 2001-05-11 2002-11-21 Nitta Corporation Convoyeur a bande a billes

Also Published As

Publication number Publication date
JPS497591A (enrdf_load_stackoverflow) 1974-01-23
FR2180390A5 (enrdf_load_stackoverflow) 1973-11-23
NL7304906A (enrdf_load_stackoverflow) 1973-10-16
GB1420360A (en) 1976-01-07
DE2318243C2 (de) 1986-03-20
IT982943B (it) 1974-10-21
DE2318243A1 (de) 1973-10-18
CH560274A5 (enrdf_load_stackoverflow) 1975-03-27

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