EP0140801A1 - Device for lifting and lowering the ring rail of textile machines such as twisting frames - Google Patents

Abstract

The device comprises a motor M driven alternately in opposite directions. Its rotational motion is transformed into alternating motion by a system with a screw (10) and nut (11). The motor M is controlled by a programmable logic controller (16) and a programmed scanner (17) is associated with the nut (11) controlling the raising and lowering movement. The scanner enables the position of the component (belt) controlling the bank of rings to be read at each instant. This makes it possible to carry out a series of steps laid down beforehand in relation to the particular bobbin to be produced. <IMAGE>

Description

The present invention relates to an improvement in the up-and-down control of the ring-holders of textile machines, such as the twisting looms.

To date, on the trades of the aforementioned type, the control of the up-and-down is obtained by means of mechanical systems (cam boxes) which make it possible to simultaneously control all of the positions that the machine comprises.

It is well known that it is necessary, depending on the type of winding carried out, the nature of the wire, to modify the stroke of the up-and-down during the formation of the winding.

The mechanical systems used to date allow these results to be obtained, but it must be recognized that they lack flexibility and do not allow variations in the speed of rise and fall during the formation of the coil.

GB-A-2 034 763 has also proposed a system for controlling the lift and drop using electronic means and making it possible to control the variation of the stroke as a function of the nature of the wire treated and of the coils. to achieve.

Such a system cannot however be used when the movement control of the up-and-down movement is of the type according to which the transmission of the movement to the ring holder is obtained by means of a flexible strap associated with a rotary sector and controlled by a rigid plate common to several straps. In addition, such systems do not make it possible to obtain a speed variation during training but simply a programmed control of the race.

Now we have found, and this is what is the subject of the present invention, a control device improved, simple, which not only makes it possible to obtain precise control of the up-and-down movement but also makes it possible to change almost instantly the winding parameters according to the desired winding, namely, for example, the length of stroke and / or speed of up-and-down at any time.

In addition, the device according to the invention can also be used in combination with a spindle with variable control, which makes it possible to obtain, at any time, the optimum crossing angle for producing a very good winding with suitable characteristics. depending on the desired application.

• - d'une part, le déplacement longitudinal alternatif du plat rigide est obtenu au moyen d'un servo-moteur entraîné alternativement dans un sens et dans l'autre et dont le mouvement de rotation est transformé en mouvement alternatif par un système à vis et écvou ;
• - d'autre part, ledit servo-moteur est piloté par un automate programmable ; un lecteur codé est associé à l'écrou (ou chariot) commandant le mouvement de monte-et-baisse et permet, à chaque instant, de lire la position de la sangle et par suite, celle du banc d'anneaux sur la machine, ce qui permet de piloter une loi de séquences préétablies en fonction de la bobine à réaliser.

In general, the invention therefore relates to a device for controlling the upward and downward movement of the ring holders of a textile machine in which the transmission of the movement to the ring holder is obtained by means of a flexible strap associated with a rotary sector and controlled by a rigid plate common to several straps, this device being characterized by the fact that:

• - on the one hand, the reciprocating longitudinal displacement of the rigid plate is obtained by means of a servomotor driven alternately in one direction and in the other and whose rotational movement is transformed into reciprocating movement by a screw system and ecvou;
• - on the other hand, said servo motor is controlled by a programmable automaton; a coded reader is associated with the nut (or carriage) controlling the up-and-down movement and makes it possible, at all times, to read the position of the strap and consequently that of the ring of rings on the machine, which makes it possible to control a law of preset sequences according to the coil to be produced.

• - la figure 1 est un schéma de principe montrant la manière dont est réalisée la commande du mouvement de monte-et-baisse d'un porte-anneaux au moyen d'un dispositif conforme à l'invention ;
• - la figure 2 est une vue schématique, de détail, montrant la manière dont est réalisé le pilotage du monte-et-baisse au moyen d'un automate programmable ;
• - la figure 3 est un schéma de détail du raccordement général d'un automate programmable utilisé pour la mise en oeuvre de l'invention.

Other characteristics of the device according to the invention as well as the advantages which it brings will however be better understood thanks to the example of embodiment given below by way of non-limiting example and which is illustrated by the attached diagrams in which:

• - Figure 1 is a block diagram showing the manner in which the control of the up-and-down movement of a ring holder is carried out by means of a device according to the invention;
• - Figure 2 is a schematic view, in detail, showing the manner in which the control of the up-and-down is achieved by means of a programmable controller;
• - Figure 3 is a detailed diagram of the general connection of a programmable controller used for the implementation of the invention.

Referring to Figure 1, the invention therefore relates to a device for controlling the up-and-down movement of a ring holder of a textile machine. Such a machine being well known to technicians will not be described in detail.

In known manner, the up-and-down movement of the ring holder is transmitted by means of a rigid plate (1) common to several straps (2) and which acts on a sector (3) controlling the support elements (4) slidingly mounted in plain bearings (5).

The control of the rigid plate (1) is obtained by a servo motor M controlled alternately in one sen $ and in the other. This servo motor M controls a shaft (6) mounted on bearings (7,8) in a bearing (9). This shaft (6) rotates in one direction and in the other a screw (10) on which is mounted a nut system (carriage) (11) whose end (12) is connected to the plate (1). A roller (13) provides guidance.

The motor M can be mounted either directly on the shaft (6), or as shown in Figure 2, transmit its movement to the screw (10) by through return elements (14,15).

In order to obtain the different parameters (variation of the stroke and / or the speed of up-and-down) enabling the desired reel to be produced, the screw and nut system (10,11) is associated with a control unit and control as described in Figure 2.

This set of monitoring and control consists essentially of a programmable controller designated by the general reference (16).

The inputs of this programmable logic controller are essentially supplied by an encoder (17) associated with the nut (carriage) (11) which reads at every instant the position of said nut (11) and therefore that of the strap, therefore the position of the bench of rings on the machine.

End-of-travel members (18, 19) are of course provided.

This programmable controller (16) transmits the information to an electronic variator (20) which therefore controls the servo motor M (reversal of the direction of rotation, speed variation).

Figure 3 illustrates in detail a programmable controller (16) produced in accordance with the invention.

This FIG. 3 is a diagrammatic representation established in a conventional manner, which allows a person skilled in the art to understand how the automaton capable of being used for implementing the invention is made. Consequently, the structure of such an automaton will not be described in detail for the sake of simplification.

It should however be noted that such an automaton (16) makes it possible to control both a rewinding system of the motorized spindle type (MTB) and a ring bench system (BA). In addition, it can also control the supply of the wire feeder (CF).

This automaton can be used with a pre-recorded cassette player (A6), depending on each of the types of reels that one wishes to produce.

It can also be associated with a display screen (A3), allowing at all times to know the length, the diameter of the winding, ..., with a programming keyboard (A5), an input keyboard for the different parameters (A4).

Thanks to such an up-and-down control system, it is possible to obtain a very large variation in the stroke (for example between 200 mm and 420 mm), an instantaneous variation in speed and therefore to modify the shape. of the winding formed as a function of the material and the type of winding to be produced (alternating or degressive biconical cops, coils with equal or unequal cheeks, bottle coils ...). It is possible to obtain a cone of different value, to vary the removal of the wire to achieve jamming, to provide for the formation of a reserve.

Of course, the possibility of returning the bank of rings to the low position in order to facilitate the digging of the coils is also conceivable.

Means for detecting the stopping of the ring bench can also be used.

Of course, the invention is not limited to the embodiment described above, but it covers all the variants produced in the same spirit.

Thus, it is particularly suitable for being associated with a winding spindle with variable speed, which allows very great flexibility.

Claims (1)

1 / Up-and-down control device for the ring-holders of textile machines such as twisting looms, of the type according to which the transmission of movement to the ring-holder is obtained by means of a flexible strap (2) associated with a rotary sector (3) and controlled by a rigid plate (1) common to several straps, characterized by the fact: - on the one hand, the alternating longitudinal displacement of the rigid plate (1) is obtained by means of a motor M driven alternately in one direction or the other and whose rotational movement is transformed into reciprocating movement by a system with screw (10) and nut (11); - And that, on the other hand, said servo motor M is controlled by a programmable automaton (16), a coded reader (17) being associated with the nut (11) (or carriage) controlling the movement of hoist and -lower and allowing, at each instant, to read the position of the strap (2) and consequently that of the ring of rings on the machine, which makes it possible to control a law of preset sequences according to the coil to be produced.

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