FR2918977A1 - Winding and re-winding device for rolling material e.g. band, has injecting and removing device injecting and removing quantity of dose air in chamber, to increase or decrease internal pressure of pneumatic jack - Google Patents

Abstract

The device has a support force control unit with a simple and double effect pneumatic jack (8) that is subjugated to injecting and removing device (10) by a chamber (9.1). The injecting and removing device injects and removes quantity of dose air in the chamber during the formation of spool to increase or decrease the internal pressure of the jack in gradual manner to reduce and increase the traction force or thrust force which is generated. An independent claim is also included for a system for rolling material e.g. band and textile thread, on its support e.g. tube, to form a spool.

Description

The invention relates to the technical field of production,

  transformation or implementation of continuous elongated materials, including textile strips or yarns and more particularly in the phases where these materials are used in the form of winding on cylindrical or conical supports in the form of coils. In what follows, the term "general coil" refers to a winding of elongated material or wire on a support, and by tube said support, whether cylindrical or frustoconical, with or without lateral flanges. The invention relates more particularly to winding or winding devices which consist of winding the material on its support to form a coil, the latter being kept in contact with a cylinder with a bearing force so that the two elements s' drive each other in rotation. Depending on the case, one of the elements (the coil or the cylinder) is rotated by known average revolution such as an individual motor or a shaft line, the other element which is free in rotation is driven by the friction that results from the support force. As the winding progresses, the diameter of the spool increases, so that the distance between the cylinder and the support must change. For this, the support or the cylinder is subject to a holding device with a displacement capacity. Depending on the case, this displacement is of the rotation or translation type. Many configurations of such devices are known to those skilled in the art, as is apparent for example from Figure 1.

  As illustrated by this figure, the material or wire (F) is wound in the form of a coil (2) on a support (1) held by a holding device (3) capable of relative movement with respect to the cylinder (4) . This displacement can be a rotation about an axis parallel to the axis of the cylinder or a translation by means of a linear guide. Whatever the embodiment, the problem is to create the contact force between the coil and the cylinder. Many solutions have been proposed to create this force, including support devices using springs, cylinders or motors. Now it has been found that the contact force between the coil and the cylinder must be carefully adjusted according to the wound material and the characteristics desired for the coil. Depending on the case, it is necessary to have a large contact force to obtain a high density coil in which the wire is wound under tension, or conversely to have a low contact force to obtain a low density coil in which the wire is wound in a relaxed state.

  It is sometimes necessary for the contact force to be uniform from the beginning to the end of the coil or to vary according to, for example, its diameter. Finally, in the cases where the cylinder is fixed and the voice coil has a displacement having a vertical component, the own weight of the coil which evolves during the winding is added or subtracted to the support force created by the device. support spring or cylinder.

  Many solutions have been proposed to adjust and control the bearing force between the coil and the cylinder, for example by means of an additional device capable of creating an adjustable force that adds or subtracts from the other forces present, and especially those resulting from the weight of the coil, to correct or compensate for variations. US 5112000 discloses a contact force control system by means of an electric motor set to deliver a torque transmitted to the device for maintaining the coil.

  Patent FR 2,681,586 discloses a system for adjusting the contact force by means of a pneumatic jack powered by a pressure source set to a value prefixed by means of a valve. The application EP 1.765.705 describes a system for adjusting the contact force by means of a jack whose angle of action is adjusted by rotating its support by means of an electric motor. Patent Applications US2005082417 and DE 102005005096 describe systems for adjusting the contact force by means of a spring whose one of the attachment points is adjustable via a cam. The proposed solutions are relatively complex and particularly expensive especially in the case of applications to textile machines with a large number of independent work positions, where the proposed devices and their control system must be repeated at each position.

  Now it has been found, and it is the object of the present invention, a simple and effective device for controlling the support force between the coil and the cylinder that solves the problems described above.

  The invention applies to winding devices or winding which consist of winding a material on a support to form a coil, the latter being held by a holding system in contact with a cylinder with a bearing force that is wants to control as and when the formation of the coil.

  The support force control device according to the invention comprises at least one single or double-acting pneumatic cylinder whose thrust and / or traction force is added to and / or subtracted from the other forces in the presence which contribute to the support of the coil on the cylinder, and of which at least one of the chambers is, during the formation of the coil, in relation with a device that injects or withdraws, in pulses, measured quantities of air, in order to increase, or decrease, gradually its internal pressure and therefore the thrust force and / or traction it generates.

  According to a variant of the invention, the other chamber is constantly connected to an adjustable fixed pressure by means of a valve or a pressure regulator. According to a first embodiment of the invention, the injection or extraction device consists of a valve controlled by a pulse causing its opening and closing, the quantity of injected or extracted air being dosed by a time. opening of the said valve.

  According to a preferred embodiment of the invention, the injection or extraction device consists of a chamber and valves associated with a piston driven by a movement back and forth such as a volume of air either pre-dosed and then discharged, the quantity of air injected or extracted being dosed by the volume swept by the piston (section by stroke). According to this preferred embodiment of the invention, the piston of the injection or extraction device has a fixed or variable stroke controlled by mechanical means (motor, cam ...) electromechanical (electromagnet) or pneumatic.

  According to a particularly advantageous embodiment, the piston of the injection or extraction device has a fixed stroke controlled by the application of a pressure at the rear of the piston and the pre-dosing stroke being controlled by a spring recall. According to an important aspect of the invention, the chamber which is connected to the injection or extraction device and also connected to a reset device, closed for the duration of the formation of the coil and which will be activated when changing the coil to restore the initial pressure. According to another important aspect of the invention, the quantity of air injected or extracted at each pulse by the device represents a volume of air, measured under the pressure conditions prevailing in the chamber, of less than 50% of the volume of air. the cylinder chamber increased by the volume of the connecting circuits regardless of the position of the piston in the cylinder.

  Whatever the embodiment of the invention, the pulses of the injection or extraction system of the quantity of pre-metered air are controlled by a control member. Several control modes can be envisaged: According to a first driving mode, the injections or extractions by pulse are controlled at fixed or variable time intervals.

  According to a second driving mode, the injections or extractions by pulse are controlled according to the evolution of the diameter of the coil, which diameter can be measured by a displacement sensor or calculated from the measurement of the speed of rotation of the coil or obtained by other means.

  According to a third driving mode, the pulses are controlled according to the actual bearing force, which force can be measured by a force sensor or obtained by other means.

  Whatever the control mode, it can be achieved by means of a computer, a PLC or any other electrical or electronic system.

  The invention also relates to a winding system equipped with: - a rotating cylinder in a fixed position - a device for holding a tube on which the coil-shaped material is wound by applying it to the cylinder with a bearing force, said holding device having a displacement capacity to vary the distance between the coil and the cylinder, at least one pneumatic cylinder single or double effect disposed between the holding system and a fixed point so the thrust and / or traction force is added to and / or subtracted from the other forces involved which contribute to the support of the coil on the cylinder, at least one injection device, or withdrawal device, by impulse during the formation of the coil of quantities of air dosed in at least one of the chambers of said jack in order to gradually increase or decrease its internal pressure and therefore the pushing and / or pulling force that it generates.

  According to one embodiment of the invention, the holding device is mounted with displacement capacity in translation along a linear guide system constituted by the pneumatic cylinder or cylinders which contribute to the control of the bearing force.

  According to a particularly advantageous embodiment of the invention, the linear guide device for the translation of the holding system is constituted by two pneumatic cylinders double rod, the rods being fixed, and the cylinder body being movable and secured to the system to maintain.

  The invention will be better understood with reference to the appended figures and drawings given by way of example and in which:

  FIG. 1 gives a general perspective diagram of a winding device according to the state of the art; FIG. 2 shows a schematic side view of a winding device according to the invention for which the holding system the coil is provided with a capacity for rotational displacement about an axis; Figure 3 shows a schematic side view of a device according to the invention for which the coil holding system is provided with a capacity displacement by translation by means of a linear guide; FIG. 4 is a schematic side view of a device according to the invention for which the system for holding the coil is provided with a capacity for displacement by translation by means of a linear guide constituted by the jack which controls the support force; FIG. 5 is a schematic side view of a device according to the invention with the diagram of a device for injecting an amount of air pre-dosed by the movement of a piston; FIGS. 8 show diagrams illustrating, by way of example, the operating mode of the support force control system.

  The invention therefore applies to winding or winding devices 20 which consist in winding an elongated material, such as a wire (F) on a support (3) to form a coil (2), the latter being kept in contact with a cylinder (4) with a pressing force that is to be controlled as and when the formation of the coil. The bearing force control device comprises at least one pneumatic cylinder (8) single or double effect whose thrust force and / or traction adds up and / or retreats to other forces in the presence which contribute to the support of the coil (2) on the cylinder (4). According to the invention, at least one of the chambers (9.1, 9.2) of the jack (8) is, during the formation of the coil (2), in connection with a device (10) injecting or taking it, pulses, measured quantities of air.

  Two solutions according to the invention can be realized: the device (10) injects, in pulses, metered air quantities in order to gradually increase the internal pressure of the cylinder and therefore the thrust and / or traction force that it generates, the device (10) removes, by pulses, metered air quantities, to gradually reduce the internal pressure of the cylinder and thus the thrust force and / or traction it generates.

  According to a variant of the invention, the support force control device comprises at least one pneumatic jack (8) double effect whose thrust force and / or traction is added and / or entrenched to other forces in the presence of which contribute to the support of the coil (2) on the cylinder (4). One of the chambers (9.1) of the cylinder is constantly connected to a source (11) of constant pressure adjustable by means of a valve or a pressure regulator. The other chamber (9.2) is, during the formation of the coil, in connection with the device (10) injecting or pulsing quantities of air dosed, to increase or gradually reduce its internal pressure and therefore the thrust force and / or traction it generates.

  According to this variant, the fixed pressure applied to the chamber (9.1) creates a constant force that adjusts the initial support force at the beginning of winding. During winding this fixed force is maintained. The injections or extractions by air impulse in the other chamber (9.2) during winding, allow to create a variable force, for example to compensate for the evolution of the weight of the coil.

  To simplify the explanations, in the following, the operation of the devices according to the invention will be described in the solution according to which the device (10) injects a quantity of air to increase the pressure in the chamber (9.2) of the jack. It will be easy for one skilled in the art to deduce from this description the operating mode in which the device (10) performs an extraction of said amount of air.

  According to a first embodiment of the invention, the device (10) consists of a valve controlled by a pulse causing its opening and closing. According to this embodiment, the quantity of air injected is dosed by the width of the control pulse of the valve which determines the opening time of said valve.

  According to a preferred embodiment of the invention, the device (10) consists of a chamber (11) and valves (12.1 and 12.2) associated with a piston (13) driven in a back and forth motion as a volume of air is pre-dosed and then discharged, the quantity of air injected or extracted being dosed by the volume swept by the piston (section by stroke).

  Prior to injecting the amount of air, the piston (13) is positioned so that an amount of air is enclosed in the volume (15).

  The injection is obtained by actuating the piston (13) to expel air trapped in the volume (15) to the chamber (9.2) of the cylinder (8) through the discharge valve (12.2). Then the piston (13) is returned to its original position. The discharge valve (12.2) closes insulating the chamber (9.2) of the cylinder. The volume (15), reformed by the recoil of the piston, being filled with air through the inlet valve (12.1), the sucked air is thus pre-dosed for the next injection According to this preferred embodiment of the invention, the piston (13) of the injection device with a fixed or variable stroke which can be controlled by any known mechanical, electrical or pneumatic means.

  By way of nonlimiting example, it is proposed to control the piston (13) by pneumatic means according to which the fixed injection stroke is controlled by the application of a pressure at the rear of the piston, by means of example of a solenoid valve (14).

  The return of the piston (13) to its initial position and therefore the pre-dosing stroke can be obtained by applying a pressure in the air supply circuit through the inlet valve (12.1) under reserve that this pressure is always lower than the pressure in the chamber (9.2) of the cylinder (8). The return of the piston (13) to its initial position can also be obtained by means of a return spring (15).

  According to an important aspect of the invention, the cylinder chamber (9.2) which is connected to the injection device (10) is also connected to a reset device (not shown), closed during the formation of the coil and that will be activated during the reel change to restore the initial pressure.

  According to another important aspect of the invention, the quantity of air injected or extracted at each pulse by the device (10) represents a volume of air, measured under the pressure conditions prevailing in the chamber, of less than 50% of the volume of the cylinder chamber (9.2) increased by the volume of the connecting circuits irrespective of the position of the piston in the cylinder.

  Referring to the diagrams illustrated in Figures 6, 7 and 8 to better understand the operation of the invention. The first diagram (FIG. 6) shows the evolution curve (16) of the weight (P) of the coil (2) as a function of time (t). The second diagram (Figure 7) shows the instants (17) where are performed air injections. The third diagram (FIG. 8) shows the evolution curve (18) of the force Fv created in the jack. This force Fv results from the addition of the force exerted on the piston by the fixed pressure of the chamber (9.1) which is constant and the force exerted by the variable pressure in the chamber (9.2) which is connected to the device. injection.

  During the formation of the coil, the increase in its diameter causes the expansion of the chamber (9.2) of the jack (8). Between two injections of air, the chamber (9.2) is closed by the valve (12.2), it follows that this expansion causes a decrease in its pressure, which corresponds to the decreasing sections (20) of the curve (18) ( Figure 8). During injection controlled by a pulse (17) an amount of air is injected which causes a rise in the immediate pressure in the chamber, which corresponds to the fronts (19) of the curve (18). The height of the fronts (19) depends on the ratio between the volume of air in the chamber (9.2) and the volume of air injected. As the coil is formed, the volume of the chamber (9.2) of the jack (8) increases so that the relative pressure variations due, on the one hand, to the expansion between two injections and, on the other hand, the volumes of air injected at each injection, are increasingly low. As a result of these explanations, by choosing, on the one hand, the quantity of air injected and, on the other hand, the interval between two pulses, it is

  possible to obtain an evolution during winding of the force (Fv)

  delivered by the cylinder (9). To obtain this result the pulse frequency

  can be fixed or variable. Thus, for example:

  compensating the evolution of the weight of the coil to obtain a bearing force of the coil (2) on the cylinder (4) constant, as has been illustrated in the example shown in Figure 8.

  varying the support force of the coil (2) on the cylinder (4) for example, decrease the force during winding combine these two effects. To obtain this result, whatever the embodiment of the invention, the pulses of the system (10) for injecting or extracting the

  20 pre-dosed air quantity are controlled by a control member. Several modes of control can be envisaged. According to a first driving mode, the injections or extractions by

  pulse are controlled at fixed or variable time intervals. In this case, the time intervals are programmed in advance, for example according to

  a time table measured from the beginning of the winding.

  According to a second driving mode, the injections or extractions by pulse are controlled according to the evolution of the diameter of the coil. In this case, the diameters at which the pulses must be triggered can be programmed in advance, for example according to a table. According to this second driving mode, the diameter of the coil can

  be measured by any means such as, for example by way of non-limiting indication: by means of a position sensor providing a magnitude representative of the distance between the cylinder and the coil, from which the diameter of the coil is deduced

  by means of a sensor providing a magnitude representative of the rotational speed of the coil, from which the diameter of the coil is deduced.

  According to a third control mode, the winding system is equipped with a sensor providing a magnitude representative of the bearing force of the coil on the cylinder. In this case, the pulses are controlled to obtain a bearing force according to a setpoint which may be a fixed value or variable as a function of time or as a function of the diameter of the coil or any other parameter of windings. Figures 2 and 3 show the diagram of a winding system according to the invention. Such a winding system consists of: - a rotating cylinder (4) in a fixed position

  - a holding system (3) of a tube (1) on which the coil-shaped material (2) is wound by applying it to the cylinder (4) with a supporting force, said maintains having a rotational displacement capacity about a fixed axis (5) (Figure 2) or by translation along a linear guide system (7) (Figure 3), to vary the spacing between the coil (2) and the cylinder (4), a pneumatic cylinder (8) single or double effect disposed between the holding system (3) and a fixed point (6) so that the pushing force and / or traction Adds and / or retracts to other forces involved which contribute to the support of the coil (2) on the cylinder (4), an injection device (10), or withdrawal, by pulse during forming the coil of metered air quantities in at least one of the chambers (9.1, 9.2) of said cylinder (8) to increase, or gradually decrease, its internal pressure and thus the force of ussée and / or traction it generates.

  Figure 4 shows the schematic of one embodiment of translational displacement along a linear guide system. According to this embodiment of the invention, the linear guiding device (7) allowing the translation of the holding system (3) is constituted by the pneumatic jack or cylinders (8) which contribute to the control of the bearing force.

  According to this particularly advantageous embodiment of the invention, the linear guiding device (7) allowing the translation of the holding system (3) is constituted by two pneumatic cylinders (8) with double rod (16.1, 16.2), said rods being fixed, and the cylinder body (17) being movable and secured to the holding system (3).

Claims (14)

  1. Device for winding or winding systems which consists of winding a material (F) on a support (1) to form a coil (2), the latter being held by a holding device (3) in contact with a cylinder (4) and subject to at least one jack for creating on said cylinder a controlled bearing force, characterized in that the jack (8) is controlled by at least one of its chambers (9.1) to a device (10), injecting, or taking it, impulse metered amounts of air, to gradually increase or decrease its internal pressure and thus the thrust force and / or traction it generates.   2. Device according to claim 1, characterized in that the other chamber (9.2) is constantly connected to a fixed pressure (11) adjustable by means of a valve or a pressure regulator.   3. Device according to any one of claims 1 to 2 characterized in that the device (10) of injection or extraction consists of a valve controlled by a pulse causing its opening and closing, the amount of injected or extracted air being dosed by a time of opening of the said valve.   4. Device according to any one of claims 1 to 2 characterized in that the device (10) for injection or extraction consists of a chamber (15) and valves (12.1, 12.2) associated with a piston (13) moved back and forth such that a volume of air is pre-dosed and discharged, the amount of air injected or extracted being dosed by the volume swept by the piston (13).   5. Device according to claim 4 characterized in that the piston (13) of the injection device (10) has a fixed or variable stroke controlled by mechanical or electromechanical or pneumatic means.   6. Device according to claim 4 characterized in that the piston (13) of the device (10) for injection or extraction has a fixed stroke controlled by pneumatic means, the injection stroke being controlled by the application a pressure at the rear of the piston (13) and the pre-dosing stroke being controlled by a return spring (14).   7. Device according to any one of claims 4 to 6 characterized in that the chamber (9.2) which is connected to the device (10) for injection or extraction is also connected to a reset device, closed during the duration of the formation of the coil and activated during the coil change to restore the initial pressure. 20   8. Device according to any one of claims 3 to 7 characterized in that the amount of air injected or extracted at each pulse by the device (10) represents a volume of air, measured under the pressure conditions prevailing in the chamber (9.2), less than 50% of the volume of the chamber (9.2) of the cylinder (8) plus the volume of the connecting circuits 25 regardless of the position of the piston in the cylinder (8).   9. Device according to any one of claims 1 to 8 characterized in that the pulses of the system (10) for injecting or extracting pre-dosed air quantity are controlled by a control member which controls the pulses. at fixed or variable time intervals.   10. Device according to any one of claims 1 to 8 characterized in that the pulses of the system (10) of injection or extraction are controlled by a control member according to the evolution of the diameter of the coil ( 2), which diameter is measured by a displacement sensor or calculated from the measurement of the rotational speed of the coil.   11. Device according to any one of claims 1 to 8 characterized in that the pulses of the system (10) of injection or extraction are controlled by a control member according to the actual bearing force, which force can be measured by a force sensor.   12. Winding system for winding a material (F) on its support (1) to form a coil (2) characterized in that it comprises: a rotary cylinder (4) in a fixed position - a holding device (3) a tube (1) on which the coil-shaped material (F) is wound by applying it to the cylinder (4) with a supporting force, said holding device (3) being mounted with displacement capacity for varying the spacing between the coil (2) and the cylinder (4), at least one pneumatic cylinder (8) single or double effect disposed between the holding system (3) and a fixed point (6) so that the thrust and / or traction force is added to and / or subtracted from the other forces involved which contribute to the support of the spool (2) on the cylinder (4), at least one device (10) ) of injection or impulse withdrawal during the formation of the coil (2) of quantities of air dosed in at least one of the chambers (9.1, 92) of said cylinder (8) in order to gradually increase or decrease its internal pressure and therefore the pushing and / or pulling force that it generates.   13. Winding system according to claim 12, characterized in that the holding device (3) is mounted with translational displacement capacity along a linear guide system (7).   14. Winding system according to claim 13, characterized in that the linear guide system (7) for the translation of the holding device (3) is constituted by two pneumatic cylinders (8) with double rod, the rods being fixed. , and the cylinder body (8) being movable and secured to the holding system (3).