FR2534939A1 - Devices for adjusting the warp threads and heat-setting of self-gripping looped tapes, suitable for the knitting loom - Google Patents

Abstract

The invention relates to the technical field of textiles. These devices comprise a creel C with anti-snarl means for the threads F intended to form the female gripping loops of the tape, a device for feeding said threads F with distribution rollers 13-14 driven at an adjustable speed by the intermediary of a reduction gear 18 driven by the motorised shaft 21 of the loom; a heat-setting assembly for the knitted tapes at their outlet from the loom, with a vertically movable horizontal frame 33, supporting the heat-setting elements and maintained in a low working position by an electro-magnet system 41 acting only when said loom is in operation; a roller 48 with a means for driving the tapes, after their stabilisation treatment, controlled at control speed during the operation of the loom. The invention is especially used for self-gripping tapes.

Description

 The present invention relates to a device for regulating warp threads and for thermally fixing ribbons with hook-and-loop loops, adaptable to the knitting loom.

 It is well known that, in hook-and-loop tapes, one of the female tapes is provided on at least one of its faces, with overlapping and intertwined loops for hooking in all planes with mushrooms or hooks made on a second male ribbon constituting the counterpart.

 The female ribbon is obtained to date by weaving or else by the knitting process which is advantageously preferred due to the economy generated, and especially by the possibility of holding and tying the base of each loop, this characteristic ensuring the permanent maintenance of each loop by avoiding its deformation during repeated releases or snagging.

 The formation of the loops by knitting nevertheless presents imperfections due to the differences in tensions of the chain fulls which results in inequalities of formation and height reducing the effectiveness of the hanging, while detracting from the presentation of the ribbon.

 On the other hand, after knitting the loop tape on the loom, said tape has no holding, to allow its packaging and storage, but is instead twisted helically with interpenetration of the loops.

 According to the invention, it was desired to produce, on the one hand, a device for regulating the distribution and constant tension of the loop threads before knitting them to obtain regular knitted loops, and, on the other hand, a retractable heat-fixing device. giving the exit of the loom a rigidity and a holding of the ribbon, in order to facilitate the storage and especially the subsequent manipulations to be carried out on this ribbon. These devices being controlled in synchronism with the speed of the loom.

To set the subject of the invention, without however limiting it, in the accompanying drawings
Figure 1 is a schematic overview and profile showing a knitting machine with a warp thread regulating device and a heat-fixing device arranged and controlled on either side of a knitting machine.

 Figure 2 is on a larger scale a partial longitudinal view illustrating the anti-spin controlled distribution device of the creel of the donor of warp threads used for the formation of hook-and-loop loops of the ribbon.

 FIG. 3 is a side view in cross section corresponding to FIG. 2.

 FIG. 4 is a partial profile view illustrating the regulating and donor device for the warp threads used to form the hook-and-loop loops of the ribbon.

 FIG. 5 is an exterior view from above corresponding to FIG. 4.

 Figure 6 is on a larger scale a partial transverse view of the thermo-fixatjonagissant device on the tape after its completion. The dashed line illustrates the height clearance of the heating tubes when the loom stops.

 FIG. 7 is a front view of the device corresponding to FIG. 6.

 FIG. 8 is a top view and in plan corresponding to FIG. 6.

 This device for regulating warp threads and for thermofixing ribbons with hook-and-loop loops adaptable to knitting fabric essentially comprises a creel (C) formed in the known manner of a chassis supporting pins in superposition for receiving spools.

 The upper row or rows of bobbins (B) authorize the supply and distribution of the weft threads (T), the web of which reaches the upper part of the knitting loom and is presented in the known manner by means of bars. guide to the right of the weft displacement device.

 The intermediate rows of spools (Ca) allow the supply and distribution of the chain threads (D) intended to form the bottom of the ribbon. The ply of the warp yarns tes (D) is conveyed by means of guide bars (1) and combs (2) on the drive rollers (3, 4 and 5) specific to the trade in view of its horizontal presentation to the right of the knitting device.

 The lower rows of spools (E) allow the apprc viewing and the controlled distribution of the wires (F) intended to form the gripping female loops of the ribbon. This controlled distribution is ensured by means of an anti-spin device mounted directly on the creel (C), and by a donor device placed at the end of the packaging, and driven directly in rotation in a manner adjustable by the trade. to knit. The anti-twist device is established, according to the invention, Figures 2 and 3, with a wire (6), arranged longitudinally between two superimposed rows of coils (E) and maintained in permanent tension by means of a pulley (7) and a counterweight (8) fixed at one of its ends. This wire (6) allows the support and guidance of the wire (F) along the axis of each coil (E) in order to untwist any tendrils that may be formed. Following the wire (6), each wire of loop (F) travels downwards to partially wind up on a circularly movable return bar (9).

 This bar (9) is mounted at the end of the arm (10), the upper ends of which form clamps (101) to grip a tube. fixed longitudinal (11) on which is also wound the loop wire (F).

 I1 must be considered that the circular and concentric manual movement of the deflection bar (9) relative to the tube (11) makes it possible to obtain a winding arc of variable and adjustable amplitude and consequently a corresponding friction eliminating the tendrils which can possibly still subsist. Following the tube (11), the loop wire ply (F) is returned transversely along each vertical row to the donor device.

 The donor device produced according to the invention is disposed between the knitting loom and the creel (C) and comprises a base in the form of two T-shaped supports (12) whose upper branches allow the mounting of two rotary rollers between them (13 and 14) juxtaposed. One of the rollers (13) receives externally on its axis projecting a pulley (15) with flanges with variable spacings to allow the winding with adjustable diameter of a drive belt (16) engaged opposite to a control pulley (17). The latter is mounted at the outlet of a speed reduction unit (18) itself driven by a belt (19) connected to a pulley (20) keyed to the motor shaft (21) of the loom. Therefore, it is understood that the motor shaft (21) judiciously drives in a determined speed ratio, the roller (13) -and consequently the ply of loop wires (F).

 On the opposite side, the roller (13) receives a toothed wheel (22) which transmits by endless chain (23) the rotary movement to a pinion (24) of the same diameter keyed at the end of the roller (14).

 Therefore, the rollers (13 and 14) rotate rigorously at the same speed, to allow the distribution of the web of loop threads (F) which moves on these rollers and is held in firm support avoiding any sliding by the 'Intermediate of a counter-roller (25) placed by gravity on and entered the said rollers. A comb (263 is also placed upstream of the roller (14).

 According to these provisions, it is understood that the speed of rotation of the rollers (13 and 14), judiciously adjustable by 1 spacing of the flanges of the pulley (15), is a function of the speed of the loom. This characteristic makes it possible to obtain a judicious and optimal distribution of the ply of loop threads (F) taking into account the height of the knitted loops given by the lancets used.

 In addition, the arrangement of the rollers (13, 14) and the counter roller (25) ensures a regular and equal tension over the entire width of the ply of the loop wires (F) to obtain an equal surface ready to be engaged on the loom ensuring regular knitting according to the place and back of the ribbon.

 On leaving the donor, the controlled sheet of key threads (F) is conveyed by means of the drive rollers (27 and 28) inherent in the loom, with a view to its horizontal presentation in line with the knitting device and above 1 <- ply of chain threads (D).

 Knitting is carried out in the known manner, but with the obstruction of a female ribbon called "astrakhan" provided with loops which are perfectly regular both in height and in width and with perfectly homogeneous weave.

I1 must be considered that the knitted ribbons are routed at the exit of the loom on the thermo-fixing device intended to ensure their hold by stabilizing the loops in height so as to eliminate the spiral effect making storage impossible.
To this end, a frame (0) is arranged on the side opposite the donor, and forms at its upper part a tray (29) provided with a non-combustible plate (30) on which the ribbons coming from the upper part of the metering and routed by its own regulating rollers.

 The transverse sides of the frame (0), support at the upper part of the rods (31 and 32) centered at their base and connected to articulation on the opposite side, to a horizontal frame (33) so as to constitute on each side a deformable parallelogram allowing the displacement in height of said frame (33), rigorously keeping its horizontal position.

 According to its underside, the horizontal frame (33) allows the fixing of infrared tubes (34) emitting xQe radiation from the heat-fixing of the ribbons only when the frame (33) occupies the low service position, and when the trade works.

 I1 must be considered that the frame (33) is permanently recalled in the high position of release and non-intervention of the tubes (34) by means of a cable (35) hooked to the rear of the frame (33) and stressed by a counterweight (36) with deflection pulley (37) fixed on an extension of the frame (0). On the opposite side, another traction cable (38) with operating handle (39) allows the reverse return of the frame (33) in position for bringing the tubes (34) closer to the ribbons for their thermal fixing. This approximation position is limited by a sole (40) secured to the upper end of a link (31 or 32), which cooperates in abutment with an electromagnet (41) secured to the frame (0). This electromagnet (41) is connected to the electrical control circuit of the loom so as to be constantly excited during its operation so as to keep the frame (33) in the heat-fixing position relative to the movement of the ribbons.

 Contrary, the stopping of the loom causes the electromagnet (41) to switch off and consequently the abrupt return upwards of the frame (33) by the effect of the counterweight (36) thereby eliminating all thermo-fixing effect.

 A motor (42) for driving the heat-fixing device. Is also fixed to the base of the frame (0) and is electrically stressed in synchronism with the electric circuit for controlling the loom. This motor (42) acts by belt (43) on a train of speed reduction gears (44 - 45) which transmit the rotary movement, by a second belt (46), to a wheel (47) fixed at the end of a driving roller (48) mounted in the tape running plane, but after the radiation operation. A second roller (49) mounted with free rotation or possibly driven by the roller (48) at the same speed and at the same height allows in combination with said roller (48) the support of the ribbons after their treatment while a roller (50) placed in superposition and between the rollers (48 and '49) guides the ribbons and their drop by gravitation in a receptacle placed on the ground outside the frame (0).

 It is important to note that the drive speed of the stabilized ribbons by means of the drive roller (48) is different from the speed of the regular rollers of the trade, taking into account the effect of retraction of the length of the ribbons following the heat-fixing treatment.

 According to these provisions, it is understood that the operation of the loom ensures in combination the drive control of the creel (C) by means of the pulley (15) which acts, at the right window, taking into account the height of the loops to obtain the roller (13).

- The electrical circuiting of the electromagnet (41) in order to maintain the frame (33) in the low position in order to carry out the operation of heat-fixing the tapes.

- The roller drive control (48) for the storage of the treated ribbons.

If the loom stops, the control mechanisms for the creel (C) and the roller (48) also stop, while the electromagnet (41) is no longer energized to allow the frame (33 sound height clearance by the action of the counterweight (36), the heat-fixing of the stationary ribbons is thus eliminated,
The advantages are clear from the description.

 The invention is in no way limited to that of its modes of application any more than to those of the embodiments of its various parts which have been more particularly indicated; on the contrary, it embraces all its variants.

Claims (9)

-1- Devices regulating warp threads and thermo-fixing ribbons with hook-and-loop loops, adaptablff on knitting loom, characterized by the fact that they fall into a creel (C) with an anti-twist means of the threads (F ) intended to form the gripping female loops of the ribbon, a device for donating said wires (F) with distributing rollers (13 - 14) driven at adjustable speed by means of a reduction gear (18) receiving its movement from the motor shaft ( 21) of the trade; a set of thermofixation of knitted ribbons at their exit from the loom, with a horizontal frame (33) movable vertically, supporting thermofixation elements and maintained in the low working position by an electromagnet system (41) acting only during operation of said trade; a roller (48) with means for driving the ribbons, after their stabilization treatment, controlled at a controlled speed during operation of the loom. -2- Devices according to claim 1, characterized in that the creel (C) is established with a frame supporting in superposition horizontal rows of pins to receive upper coils (B) for the supply and distribution of weft yarns T, the web of which leads directly to the loom; intermediate coils (C) for supplying and distributing the wire of chalnettes (D) intended to form the bottom of the ribbons and the web of which is driven by the rolls specific to the trade; lower coils (E) - for the supply of threads (F) intended to form the female loops of the ribbons, with anti-twist means and the web of which ends at the donor device. -3- Creel according to claim 2, characterized in that the anti-twist means of the wires (F) intended to form the female loops of the ribbons comprises a support wire (6) stretched longitudinally between two rows of pins for the support in superposition of each wire (F) and its vertical downward routing on a return bar (9) circularly mobile around a fixed tube (11), the latter authorizing the winding of the loop wire (F) in an arc of variable amplitude, depending on the circular positioning of the deflection bar (9), ensuring corresponding friction; the layer of loop threads (F) is then directed to the donor device. -4- Dispositiffi according to claim 1, characterized in that the donor of the loop son ply (F) has a base allowing at its upper part the mounting of two driving rollers (13 and 14); one of the rollers (13) comprising at the end a drive pulley with flanges with variable spacings in order to obtain an adjustable speed given by a mission belt drive from the motor shaft (21) of the loom with block reducer (18) interposed, while the other roller (14) is directly driven by the roller (13) by means of pins and transmission chain (23); a counter-roller (25) being arranged by gravitation on the sheet of loop wires (F) and between the rollers (13 and 14). -5- DispositiS according to claim 1, characterized in that the heat-fixing assembly of the ribbons comprises a frame (0) disposed opposite the donor, with an upper support plate (29) of the knitted ribbons at their exit from the loom, a mobile horizonSal frame (33) mounted on rods (31 - 32) with heating means (34) to act in radiation on said ribbons in the manner of a deformable parallelogram when they are scrolled on the plate (29); means for retaining and disengaging the height of the frame (33) controlled by stopping the loom, with a view to eliminating the effect of radiation; a means of driving the treated ribbon to allow its storage. -6- Thermo-fixing assembly according to claim 5, characterized by the fact that means for retaining and abutment of the frame (33) in the thermo-fixbn position comprises an electromagnet (41) fixed on the frame ( 0) to act on a sole (40) secured to a link (31) during magnetization; the excitation of the electromagnet (41) being permanently ensured by the electrical circuit for putting the loom into operation. -7- Thermo-fixing assembly according to claims 5 and 6, characterized in that the frame (33) is returned to the high position away from the heating means (34) relative to the ribbons, and when the electromagnet (41) is no longer excited by means of a counterweight (36) with deflection pulley (37) fixed on an extension of the frame (O), a traction cable (38) with operating handle ( 39) allows the reverse recall of said frame (33). -8- DispositiS according to claims 1, 5, 6 and 7, characterized in that the heat-fixing assembly of the ribbons comprises driving rollers (48 - 49) arranged in juxtaposition and a counter-roller (50) placed in support, these rollers being mounted in the plane of travel of the ribbons after their radiation, in order to ensure their entrainment and their fall in a storage receptacle. -9- Devices according to claim 8, characterized in that the driving rollers (48 - 49) receive their movement from a motor (42) mounted on the electric circuit of the loom to act via reduction gears (44 - 45) and by belts (43 - 46) on a wheel (47) fixed at the end of a driving roller (48), so as to allow a speed of the ribbons different from the speed of the regulating rollers of the trade, taking into account the effect of withdrawal following the heat-fixing treatment.