FR2531464A1 - Automatic machine intended for the continuous production of twisted cords used especially for making curtain loops. - Google Patents

Abstract

The invention relates to the technical sector of textiles and particularly to the production of twisted cords. The machine comprises a plurality of yarn distribution means to allow the formation of an axial core F constituting the framework of the cord and, concentrically, one or more covering laps Fa, Fb, the tensioned and drawn assembly being conveyed on a profiled-groove retaining and guiding pulley, its projecting free strand Ea being twisted by means of a headstock 11 with a rotation control means, means for drawing said strand Ea, non-return means and means for winding the twisted cord onto a receiving drum 17. The invention can be used for making twisted cords of all compositions, all sizes and all colours.

Description

The present invention relates to an automatic machine intended for the continuous manufacture of twisted cords used in particular to constitute curtain tiebacks
To date, such large-diameter cords have been produced manually by successively folding over a layer of warp threads to the desired diametrical thickness, and then by covering this core with a textile envelope wound in a spiral.

 Such cords, thus produced manually, are impractical and costly to produce, while not making it possible to obtain continuous work and obtaining great length.

 It is therefore to overcome these drawbacks that it appeared necessary to produce an automatic machine according to the invention.

 According to a first characteristic, this machine is established with a plurality of trays of wires arranged coaxially to successively authorize the distribution of an axial non-braided core forming the frame and concentrically the parallel distribution of one or of covering plies; the assembly stretched parallel and axially or slightly twisted to give a certain homogeneity being guided and conveyed to an upper retaining pulley while the descending vertical strand is twisted by means of a rotary headstock with non-return pulling means and means for winding the twisted cord on a receiving drum.

 These characteristics and others will emerge from the following description.

To fix the subject of the invention, without however limiting it, in the appended drawings:
Figure 1 is, on a small scale, a schematic front view of an automatic machine intended for the continuous manufacture of twisted cords.

 Figure 2 is a view similar to Figure 1, but after a 90 degree rotation of the torsion headstock.

 This automatic machine intended for the continuous manufacture of twisted cords is established essentially with a framework (l) supporting in vertical alignment a plurality of plates or stepped discs (2, 3 and 4) fixed in position or rotating.

 Each plate (2, 3 and 4) supports a plurality of radial arms (5) provided with vertical pins (6) intended to receive respectively a coil (B) of wire. The wires are routed radially and guided by means of a circular comb (7) fixed concentrically with respect to the axial opening of each plate, so as to allow the passage of the circular layer of wires and its axial discharge. It must be considered that one of the extreme plates, the upper plate (2), in the example of the drawing, receives large wires, in any suitable texture and, respectively, constituted either by a single wire, or by several coiled wires or not, to thereby form the core or axial frame (F) of the cord.

 The intermediate plate (3) also receives yarns of any texture, color and suitable material, constituting the intermediate ply (Pa) arranged parallel and concentrically with respect to the core (F), while the terminal plate (4) receives the outer ply (Fb) constituting the final covering of the bead.

 According to these provisions, it is understood that the effects given by the layers (F - Fa - Fb) are practically unlimited, taking into account the colors used and the thickness of the bead to be obtained.

 It is obvious that any other wire collecting device can be used, such as racks, used in ribbon looms.

 At the exit from the terminal plate (4), the assembly formed by the core (F), the plies (Fa and Fb), is pulled and wound in the groove of a return pulley (8) fixed vertically to the base of the frame (1).

 It should also be considered that, to ensure a better grip of this assembly, a slight longitudinal twist can be given, by acting simultaneously in continuous rotation on the lens or on some of the plates (2, 3 and 4) by means of a vertical shaft (9) driven by the kinematic chain of the machine and provided with belt transmissions (C - Ca - Cb) acting in a reduction ratio on a wheel (R - Ra - Rb) integral with each of the plates (2, 3 and 4).

 It is also noted that, as a variant, the rotational drive speeds of the plates (2, 3 and 4) can be variable, thus ensuring a covering effect for the friend (F) or the intermediate ply (Fa).

 At the exit of the pulley (8), the assembly (E), preferably slightly twisted, is conveyed in height and locked in the V-shaped horde of an upper retaining pulley (lu), while its vertical strand (Ea ) is in the axis of a rotary headstock (11) constituting the twisting and continuous drawing element.

For this purpose, this doll (11) in the form of a yoke, is mounted at the upper part of a vertical axis (12), and receives two parallel rows of juxtaposed pulleys (13 and 14) allowing in the way of a reeving several successive windings of the vertical strand <Ea) twisted. This arrangement prevents any slipping and recall of said strand (Ea) during the twisting operation, against its winding on the receiving drum
Following this winding on the pulleys (13 and 14), the outgoing strand is conveyed by the intermediary of return pulleys (15 and 16) integral with the headstock (11) directly on the receiving drum (17) provided with '' a friction entrainment and intended to compensate for speed differences due to the modification and progression of the winding diameter of said twisted strand. This machine thus produced is driven by a motor (18) acting by chain connecting the pinions (19 and 20) on the one hand on the vertical shaft (9) for driving the plates (2, 3 and 4) and on the other hand also by sprockets (21, 22 and 23) and chain (24) on the wheel (25) key on the vertical axis (12) of the headstock (11) for its rotation.

 A vertical shaft (26) fixed externally to the headstock (11) and controlled in rotation by the vertical axis (12) by means of the pinions in gears (27 and 28) acts by means of the bevel wheels (29 and 30) on a transverse shaft (31) connecting the branches of said doll (11) and the end of which authorizes the friction mounting of the receiving drum (17) I1 must also be considered that the transverse shaft (31) receives stepped wheels (32 ) which transmit by chain (33) the rotary movement in a variable ratio, to one of the driven sprockets (34) fixed on the shaft of the lower row of pulleys (13) juxtaposed for their drive.

According to these provisions, it is understood that these transmissions
o allow in combination to obtain successively the rotation of the plates (2, 3 and 4), with a view to pre-twisting the plies (F
Fa - Fb) up to the pulley (8); the final torsion of the vertical strand (Ea), between the holding pulley (10) and the headstock (11), as a result of the rotation of said headstock (11); continuously scrolling the twisted strand by means of the rotation of the shaft supporting the pulleys (13); the continuous drive of the receiving drum (17) by the shaft (31).

 It is quite obvious that the pitch of each helical turn of the cord obtained is given on the one hand by the variable linear speed of drawing of the strand (Ea) and on the other hand by the speed of rotation of the headstock (11). It is noted for this purpose that the linear speed is made variable by the winding of the chain (33) on one or the other stepped wheel (32) and on one or the other driven sprocket (34) .

 The cords obtained are of great regularity, and can be of any suitable diameter.

 It is obvious that this machine can receive a counter authorizing the control of the length of the twisted cord.

 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- Automatic machine intended for the continuous production of twisted cords, characterized in that it comprises a plurality of wire distributing means to allow the formation of an axial core (F) forming the frame of the cord and concentrically a or covering plies (Fa, Fb); the tensioned and pulled assembly being conveyed on a pulley with a profiled groove (8) for holding and guiding whose free overhanging strand (Ea) is twisted by means of a doll (11) with means of rotation control, means of drawing of said strand (Ea), non-return means, and winding means on a drum (17) for receiving the twisted cord. -2- Machine according to claim 1, characterized in that the wire distributor means comprises a plurality of coaxial plates (2, 3 and 4) arranged in superposition and provided respectively with vertical pins to receive the coils (B) of wire each plate authorizing the radial routing of its wires by means of a circular comb and the evacuation of the circular sheet through an axial opening. -3- Machine according to claim 1, characterized in that the plates (2, 3 and 4) are fixed to obtain a continuous, concentric and parallel movement of the core (F) and the intermediate plies (Fa) and exterior (Fb). -4- Machine according to claim 1, characterized in that the plates (2, 3 and 4) are driven simultaneously in rotation at the same speed or at different speeds to obtain a slight collective pre-twist of the plies (F - Fa - Fb), up to the profiled groove pulley (8) in order to ensure the homogeneity of the assembly. -5- Machine according to claim 1, characterized in that the headstock (11) rotates vertically and receives parallel rows of juxtaposed pulleys (13 and 14) forming a block for the successive winding of the twisted strand (Ea) in view of its maintenance during the torsion operation that takes place upstream from the pulley (10) and by the rotation of said doll (11). -6- Machine according to claim 1, characterized in that the shaft supporting one of the rows of pulleys (13 - 14) is rotated to ensure continuous unidirectional scrolling of the twisted cord. -7- Machine according to claim 1, characterized in that the drum (17) for receiving the twisted cord is entrainment by friction by means of a shaft (31) connected by stepped gears (32) to the stage wheel (34 ) of the shaft supporting the pulleys (13 or 14) in order to obtain a variation in the drawing speed. -8- Machine according to claim 1, characterized in that the plates 2, 3 and 4 are driven simultaneously by a vertical shaft (9) provided with pulleys acting on the respective wheels (R - Ra - Rb) of each plate. -9- Machine according to claim 1; characterized by the fact that a motor (18) with transmission means by sprockets and chains (19-2O-21-22-23-24-2DJ simultaneously authorizes the rotation of the vertical shaft (9) for controlling the plates ( 2 - 3 - 4), the rotation of the vertical axis (12) of the headstock (11), the rotational drive of the hauling system formed by the pulleys (13 and 14), by means of a shaft (26) and driving the receiving drum (17) in rotation.