FR2545464A1 - Automatic yarn-reel unwinding and regulating apparatus, for a loom, yarn guide (carrier), pirn (bobbin) winder or other devices - Google Patents

Abstract

The invention relates to the technical sector of textiles. The apparatus comprises a casing 1 allowing a spindle 3 to be attached on the outside, the spindle being rotationally driven by a variable-speed motor 4 and intended to receive the reel (bobbin) 5 of the yarn or yarns F to be reeled off; an electrical voltage divider, such as a rotary potentiometer 7, connected via a supply or amplification system housed in the said casing to the motor 4, constituting the hinge pin of an arm 8 fitted on the end with a yarn guide 8a whose pivoting, generated by inertia while traction force is exerted by a delivery and running means against an elastic return means of the said arm, enables the rotational speed of the motor 4 and, consequently, that of the reel (bobbin) 5, to be adapted, a tension-compensating and -regulating system furthermore being constituted by fixed yarn-guides 9b and 10a which are rigidly connected to the casing and triangularly arranged with a deformable apex angle formed by the variable position of the yarn-guide 8a of the movable arm 8.

Description

 The present invention relates to textiles and in particular an automatic unwinding-regulating device for spools of thread, for weaving machines, donors, ducklings or others.

 I1 is known to wind one or more weft son on a flange spool, for their distribution and routing so on a weaving loom through a donor, rotates by motor, or even directly on a duck pot for canning.

The unwinding is carried out by scrolling, the reel occupying u: fixed position, while the thread (s) are pulled coaxially the axis of the reel, causing a twist and irregularities which are apparent on the fabric, in particular in the case flat wire
In addition, it is practically impossible to completely unwind the coil, while the wire or wires are often stretched and broken, due to irregularities resulting from inertia and their small cross section.

It is therefore to overcome these drawbacks that it appeared necessary to make an automatic bobbin winder-regulator: yarns, for weaving loom, donor, duckling or other machine or textile apparatus, being the subject of the present invention
According to a first characteristic, this unwinder-regulator of spools of threads comprises a housing with a coupling pin.

ment of one or more coils mounted coaxially, driven at the end of rotation directly or indirectly by an electric motor with variable tesse, while a pivoting wire-guide arm placed after the unwinding controls the activation of a potentiometer or other electrical voltage divider means for adapting the unwinding speed of the reel (s) to the running speed of the calling means.

 According to another characteristic, the end of the pivotal arm while receiving or constituting the movable wire guide which moves circularly and angularly between two other fixed wire guides, forming a triangulation, to allow during the sudden scrolling, the pivoting of the pivoting arm for the gradual start-up of the electric motor by the potentiometer in sound filling with compensation for running length included in the fixed wire guides to avoid the shock resulting from the inertia favorable to breakage of the wire.

 According to another characteristic, the length of the pivot arm is adjustable taking into account the section of the wire to be unwound and the plitude of the developing arc.

 According to another characteristic, the pivoting arm can be equipped with a cursor whose position is a function of the section of the wire to be unwound.

 According to another characteristic, the pivoting arm is automatically returned to the stop position of the electric motor by elastic means.

 These characteristics and others will emerge clearly from the following description.

To be the subject of the invention without however limiting it in the appended drawing:
Figure 1 is, on a small scale, a perspective view of an automatic unwinder-regulator of spools of threads according to the invention.

 Figures 2 and 3 are front views respectively illustrating the automatic unwinder-regulator respectively according to the low stop position of the pivoting arm and the angular position of thread travel.

 Figure 4 is a cross-sectional side view along line 4-4 of Figure 1.

 This automatic unwinder-regulator of spools of threads for weaving loom, donor, quilting machine or other textile machine or apparatus, is established essentially with a support (13, such as a shoemaker or box, authorizing on one of its faces, the fixing of a bearing (2) in which a spindle (3) rotates driven by a variable speed motor (4).

 According to its projecting part, the spindle (3) allows the engagement of the opening of a coil (5) furnished with one or more wires (F) and its blocking by means of a tightening member such as a nut ( 6).

 This support (1) forming a box in the example of the drawing, comprises a protective cover (la) and receives internally, the electrical supply and amplification system, produced in known manner, leading to the motor (4) and the circuitry of which is effected by means of a rotary potentiometer (7) whose drive axis (7a) projects from the vertical face adjacent to that supporting the bearing (2).

This axis (7a) is made integral with the end of an arm (8) of great length, preferably made of light material, such as a metal rod whose free end forms or receives a wire guide (8a
The support (1) also allows the fixing of legs (9 and 10) arranged perpendicularly opposite the pivoting arm (8).

The lug (9) fixed vertically on the upper face of the support (1) receives a horizontal rod (9a) provided at the end with a wire guide (9b), while the lug (10) fixed horizontally on the rear face of the support (1) receives a guide eyelet (10a) preferably arranged in the same vertical plane formed by the wire guides (8a and 9b).

 An elastic means such as a spring (11) working in torsion and centered on the axis (7a), ensures the permanent return of the pivoting arm (8) in the low position and therefore the potentiometer (7.) in the stop position of the motor (4).

 The wire (F) wound on the spool (5) is successively routed on the high wire guide (9b), on the wire guide (8a) of the arm (8) and in the eyelet (10a) of the tab ( 10) to then be requested in traction and in movement, either indirectly by the intermediary of an intermediate donor in the case of a weaving loom, and which may possibly be fixed on said support (1), either directly by a duck or a winder.

 At the exit of the spool (5), the wire (F) travels by forming a triangulation, the vertices of which are formed by the wire guides (9a and 10a) and by the movable wire guide (8a) integral with the arm (8) The latter oscillates along arrow G, so as to form strands (A and B) formed by the adjacent angle.

 When calling wires (F), the sudden pulling force acts directly on the arm (8) which, due to its low inertia pivots along (G), by rotating the potentiometer (7) which thus controls the start-up and the progressive acceleration of the motor (4) and consequently the rotation of the spool (5) up to the optimal speed corresponding to the thread running speed (F) sqllicitée by the donor, the duck or other appliance.

 It is important to consider that the triangulation forming the strands (A and B) constitutes by the mobility of the arm (8) a tension compensator which makes it possible to absorb the shocks at start-up resulting from inertia and thus to practically eliminate breaks or stretching of the wire (F).

 In addition, the oscillation of the arm (8) makes it possible to compensate for the voltage differences which may result temporarily either from the means of call (donor) disposed downstream, or else from a difficult unwinding carried out on the reel (5), adapting in all cases the speed of rotation of said coil (5).

 It is obvious that to obtain an adjustable tension of the thread (F), at the outlet of the automatic unwinder-regulator, the elastic return means such as the spring (11), of the arm (8) can be calibrated accordingly. One can also equlper the arm (8) of a cursor, not shown ', whose longitudinal positioning allows to exert a controlled force at its end constituting the wire guide (8a).

 In the same way, the length of the pivoting arm (8) can be adjustable, for example by means of telescopic elements to obtain a large amplitude of the pivoting arc, for a wide range of speeds and d '' a large margin of compensation and regulation in the case of direct use for example by a duck, a winder or other device.

 It should also be considered that the electrical voltage divider means can also be a rheostat controlled in the same way by the arm (8) and that the latter can be positioned according to its extreme strokes by stops not shown.

 The advantages are apparent from the description. In particular, we emphasize - The increase in efficiency of the stirrup as a result of the elimination of ruptures of the wire (s).

- The absence of stretching of the wires.

- Elimination of wire twist.

- The possibility of completely unwinding the reels.

 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 (6)

-1- Unwinder-regulator of thread spools, characterized in that it comprises a housing (1) externally authorizing the fixing of a spindle (3) driven in rotation by a variable speed motor (4) and intended for receiving the coil (5) of the wire or wires (F) to be unwound; an electrical voltage divider such as a rotary potentiometer (7) connected by a power supply or amplification system housed in said housing to the motor (4) constituting the articulation axis of an arm (8) provided at the end of 'A thread guide (8a) whose pivoting generated by inertia during the tract force exerted by a means of calling and scrolling against a mo: elastic return (11) of said arm allows '' adapt the speed of rotation of the motor (4) and consequently that of the coil (5), a regulator and voltage compensator system being furthermore constituted by fixed wire guides (9b and 10a) integral with the di placed in triangulation with an angle at the deformable apex formed by the variable positioning of the wire guide (8a) of the movable arm (8). -2- Uncoiler-regulator according to claim 1, characterized pa the fact that the fixed wire guides (9b and 10a) are respectively fixed on legs (9 and 10) arranged perpendicularly to the arm (8); the tab (9) being fixed vertically on the upper face of the support (1), while the tab (10) is fixed horizontally on the rear part of the housing (1). -3- Uncoiler-regulator according to claim 1, characterized pa: the fact that the elastic return means of the pivoting arm (8) in the stopped position of the electric motor (4) is a coil spring (7) working in torsion while being interchangeable, taking into account the tension force to be obtained when the thread runs (when it leaves the regulating system.  -4- Uncoiler-regulator according to claim 1, characterized pa: the fact that the pivoting arm (8) allows to receive a cursor don positioning allows to exert a controlled force on the wire (F) between the wire guides (9b - lOa) fixed. -5- Uncoiler-regulator according to claim 1, characterized pa the fact that the pivoting arm (8) is formed of telescopic elements in order to obtain the adjustment of its length. -6- Unwinder-regulator according to claim 1, characterized in that the electric voltage divider means is a rheostate.