CH633835A5 - AUTOMATIC DEVICE FOR LIFTING COILS ON A COIL FORMING MACHINE. - Google Patents

Description

The subject of the invention is an automatic device for lifting spools of thread and for placing empty bobbins with formation of thread reserve on a machine for forming cylindrical or conical spools, such as a spinning bench, winder or finisher. , in which each winding unit is surmounted by a rotary winding cylinder on which rests a bobbin guided between two arms which can pivot under the action of gravity on a horizontal axis and move away from one of the 'other for lifting a full reel and setting up an empty reel.

Automatic reel lifting devices are already known which include means for detecting a full reel stopping the corresponding spinning unit and controlling the coming, opposite this spinning unit, of a carriage fitted with empty reels of replacement. But this has the disadvantage that each spinning unit must be periodically stopped and that the carriage must move, sometimes in one direction, sometimes in the other to reach, by the shortest path, the unit whose reel must be changed. The invention aims to remedy this drawback.

To this end, the device according to the invention, for lifting thread spools and placing bobbins on a machine for forming cylindrical or conical windings, is defined as stated in claim I.

Thanks to this device, a practically continuous operation of the machine is carried out without having to interrupt the rotational movement of the winding cylinders in order to change the reels, and this in a fully automatic manner.

The invention will be better understood on reading the description which follows and on examining the appended drawings which show, by way of example, an embodiment of a device according to the invention for automatically lifting the spools of thread and the placement of empty bobbins on a spinning bench of released fibers.

In these drawings:

Figure 1 is a side view of the entire device; Figure 2 is a partial plan view corresponding; FIG. 3 shows the mechanism for controlling the advance and the reverse of the suction nozzle;

FIG. 4 shows the mechanism for controlling the raising and lowering of the suction nozzle;

FIGS. 5 and 6 illustrate, in two different positions,

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the wire cutting device;

Figure 7 shows the mechanism for raising and lowering the winding arm;

Figure 8 is a corresponding partial plan view; Figure 8A shows another position of the members shown in Figure 8;

FIG. 9 illustrates the gripper mechanism for picking up and feeding empty tubes;

Figure 10 is a sectional view of the suction nozzle, showing the thread reserve cutting mechanism;

Figure 11 shows the empty tube magazine;

Figures 12 to 16 illustrate, in perspective, the successive phases of a cycle of the installation;

Figure 17 is, on a larger scale, a partial plan view of a probe observed along the line XVII-XVII of Figure 1;

Figure 18 is, also on a larger scale, a partial plan view of a safety hook observed along the line XVIII-XVIII of Figure 1; and Figure 19 shows the hook of Figure 18 in another position.

The device shown in a simplified manner, in profile in Figure 1 and in plan in Figure 2, is intended to automatically carry out the lifting of spools of thread and the placement of empty bobbins on a spinning bench of released fibers ,

without interrupting the spinning process or the unwinding of the yarn tangentially to the spool (unwinding) or axially (unwinding).

This device comprises a carriage 1 provided, at its upper part, with rollers 2 which roll on a horizontal upper rail 3 and, at its lower part, rollers 4 which roll against a horizontal lower rail 5, so that said carriage can pass successively in front of all the spinning 11 and corresponding winding stations 7 by moving all around the machine. Each winding unit 7 comprises: a delivery cylinder 12 with its pressure cylinder 13 carried by a pivoting arm 14; a winding cylinder 17 which supports and rotates the reel 21 formed from the wire 22 supplied by the spinning unit 11; a system of two arms 23, 24 pivoting on a horizontal axis 25 (see also FIG. 12) to which we will return later and which serve to position the spool of wire 21 on the winding cylinder 17 by two pivots 27, respectively integral with the two arms 23, 24 and engaged in the two ends of a bobbin 30 which carries the bobbin 21; a wire guide 26 (Figure 12) movable back and forth in front of the winding cylinder 17; and an inclined plane 28 (FIG. 11) for the evacuation of the full coils 29.

The movements of the carriage 1 on its rails 3.5 are ensured by an electric motor with propulsion reducer 32 carried by the carriage 1 and whose output shaft 33 is connected to the running rollers 2. The supply of the electric motor 32 is ensured by means of a system of wipers 34 which slide on a fixed supply rail 35 carried by the running rail 3. The motor 32 drives the carriage 1 always in the same direction in its movement around the machine . The supply circuits of the propulsion electric motor 32 are placed under the control of a programmer 38 with electrical contacts actuated by cams and driven in rotation by an electric motor 39 also carried by the carriage 1 and controlled by said programmer.

The carriage 1 carries a photoelectric cell 42, which during the movement of the carriage, emits a signal when passing in front of a coil 21 whose maximum desired diameter is reached, with a view to causing the said carriage to stop as well as the triggering of the process of lifting a full spool and replacing it with an empty spool. As a variant, the signal can be produced, for example, by a feeler 43 also carried by the carriage and capable of being hooked to the passage by the end of an extension 24A of the arm 24 for positioning the coil. Anyway, the emission of this signal causes the interruption of the supply of the electric motor 32 propelling the carriage and the engagement of a movable bolt 46 carried by the carriage 1 in a keeper 47 fixed against the upper rolling rail 3. Thus, the carriage is firmly held temporarily immobile on its rails and precisely positioned in front of the spinning station 7 considered.

A suction nozzle 51 (see also FIGS. 3 and 4) is pivotally mounted, by an axis 52, on an arm 53 itself pivotally mounted on the carriage 1, by means of an axis 54. The nozzle 51 has an extension 51A subjected to the action of a cam 56 for controlling movements of raising and lowering of the nozzle as well as to the action of a return spring (not shown) towards the cam. The arm 53 has an extension 53A subjected to the action of a cam 58 for controlling the forward and backward movements of the nozzle and to the action of a return spring (not shown) towards the cam. The two cams 56 and 58 are fixed to a camshaft 59 which rotates in the carriage 1 and which is connected to the shaft of the electric motor 39 which is already used to drive the electric program-driver 38. The suction nozzle 51 is placed under vacuum via a flexible pipe 62, under the action of a suction fan 63 carried by the carriage 1 (FIG.

1).

In the end of the suction nozzle 51, a curved wire-cutting blade 66 (FIGS. 5 and 6) provided with a hook 67 is pivotally mounted by an axis 68 and it is urged to pivot in the dextrorsum direction, that is to say that of the arrow fl in FIG. 5, by a torsion spring 71 to cut the wire 22 and reach the angular position represented in FIG. 6. The wire-cutting blade 66 can be brought back to its initial angular position of FIG. 5 against the force of the spring 71, by an electromagnet 73 mounted in the suction nozzle 51 and acting on a connecting rod 74, one end of which is articulated, by an axis 75, on an extension 66A of the wire cutting blade 66 and the other end of which slides in a pivoting nut 76 mounted in the nozzle.

A bent lever 79 (FIGS. 7 and 8) can pivot, by its top, on a horizontal axis 81 carried by the carriage 1. One of the branches 82 of this lever is subjected to the action of a cam 83 fixed on the camshaft 59 and by the action of a spring (not shown) returning towards the cam, while its other branch is formed by a leaf of spring steel which, in the free state, has the configuration shown in Figure 8. An electromagnet 87, carried by the carriage 1, can push the branch 85 in the direction of the arrow f2 (Figure 8) as shown in Figure 8A. The end of the branch 85 carries a lug 89 suitable for lifting the end of the extension 24A of the arm 24 for positioning the coil.

The empty coils or tubes 30 on which the wire coils 21 will be formed come from a reserve contained in a hopper 102 (FIGS. 1, 2 and 11), the lower part of which is in communication with an upward bent passage 103 whose opening upper is surmounted by a reel take-up device designated as a whole by 105. This device comprises a bent lever 106 (FIG. 9) pivotally mounted, by its top, on a horizontal axis 107 carried by the carriage 1. The one, 106A, of the branches of this lever is subjected to the action of a cam 109 fixed to the camshaft 59. The other branch, 106B, of the lever 106 carries a clamp 112 for picking up the coils 101. The clamp 112 comprises two jaws 113,114 articulated, by a pin 115, on the end of the branch 106B. The two jaws 113,114 are resiliently urged to approach one another by a spring 116 (see also Figure 11) whose two ends are

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attached respectively to the ends of two extensions 117,118 of said jaws. A jaw opening device comprises an electromagnet 122 carried by the branch 106B and the movable armature of which is articulated on one end of two rods 122,123, the other end of which is articulated on the end of the corresponding jaw extension 117 or 118.

When the clamp 112 is in the position for engaging a bobbin, as shown in FIGS. 9 and 11, an electrical contact 127, carried by the carriage 1, is in the active position. Another electrical contact 128 carried by the clamp is in the active position when there is no coil between the branches of the clamp.

Below the lower orifice of the hopper 102, a drawer 131, actuated by an electromagnet 132, is responsible for pushing the bobbins 30 into the corridor 103. A vertical register 135, subjected to the action of a electromagnet 136, temporarily retains the last pushed bobbin 30A to allow the next bobbin 30B to fall from the lower part of the hopper 102 into the drawer 131 while the latter moves back.

Inside the suction nozzle 51 (FIG. 10), a knife 141, actuated by an electromagnet 142, is responsible for cutting, against an anvil 143, the part of wire 22 which is inside of said nozzle.

All the aforementioned electromagnets are controlled by means of the electric programmer 38 carried by the carriage 1.

The operation of the assembly is as follows.

The carriage 1 (Figures 1 and 2) moves on the rail 1 under the action of the roller 3 driven in rotation by the motor 32, the electric current supply of which is placed under the control of the electric programmer 38, so that said carriage passes successively in front of all the spinning stations 7 of the machine.

When the diameter of a coil of wire 21 reaches the desired predetermined value, the photocell 42 or the probe 43, carried by the carriage 1, emit a signal which triggers the automatic process of lifting said coil and replacing it with a bobbin empty. This signal causes, on the one hand the cut of the power supply of the electric motor 32, so that the carriage 1 stops in front of the spinning station 7 whose reel is full and, on the other hand, the excitation d 'an electromagnet for engaging the bolt 46 carried by the carriage in the keeper fixed to the rail 3, so that the carriage is now perfectly immobilized in a precise working position relative to the spinning station.

The electric programmer 38 supplies the electric motor 39 which drives, among other things, the cam 56 (see also FIG. 4) so that the suction nozzle 51 pivots on the axis 52 in the direction of the arrow f3 and that its mouth is placed above the level of the delivery cylinder 12. The cam 58, driven at the same time as the cam 56, rotates the arm 53 (FIG. 3) in the direction of the arrow f4, which advances the suction nozzle 51 whose mouth is now against the wire 22 (Figure 12). The programmer 38 cuts off the supply of the electromagnet 73 (FIG. 5); the spring 71 suddenly turns the curved wire cutter 66 in the direction of the arrow f 1, so that the wire 22 is cut just above the delivery cylinder 12 at the same time as the hook 67 catches the connected wire part to the spinning unit 11 and subjected to the vacuum which prevails in the suction nozzle 51 (FIG. 6); this part of the wire is guided in the right part of the nozzle in FIG. 6 (see also FIG. 13). The thread 22 is drawn from the spinning unit 11 by the delivery cylinder 12 and it is sucked into the nozzle 51 by the vacuum which prevails there.

The camshaft 59 also drives the cam 83 (FIGS. 2,

7 and 8) which rotates the bent lever 85 in the direction of arrow f5, which causes the lifting of the extension 24A of the arm 24 (FIG. 13) and, consequently, the lifting of the coil 21 out of contact with the winding cylinder 17. The electric programmer 38 causes the excitation of the electro-magnet 87 (FIG. 8); the latter repels the arm 85 which, in turn, repels the extension 24A of the arm 24 in the direction of the arrow f2. The arm 24 moves away from the arm 23 (FIG. 8 A) so that the bobbin, the length of which is less than the current spacing of the two arms 23, 24, is no longer maintained. At the same time, the suction nozzle 51 continues to rise (FIG. 14) under the action of the cam 56 and pushes, on the inclined plane 28 (FIG. 1), the finished coil 21 which rolls on the latter, as indicated. at 29, to an evacuation transporter. The suction nozzle still rises under the action of the cam 56 (Figure 4) and advances in the machine under the action of the cam 58 (Figure 3) to the position shown in Figure 14 and beyond , to the position shown in Figure 15, that is to say clearly above the reel support arms 23,24 and inside the machine, while the wire 22 continues to be sucked inside the nozzle 51, so that the latter pulls the wire upwards, over the winding cylinder 17.

The electric programmer 38 releases the electromagnet 122 (FIG. 9) so that the spring 116 controls the abrupt closing of the clamp 112 on the empty bobbin 30 (FIG. 11) which is at the top of the guide passage 103. L por-tecames shaft 59, which continues to rotate, drives the cam 109 (Figure 9) which rotates the bent lever 106 in the direction of the arrow f6 so that the aforementioned empty bobbin comes to be placed in front of the wire 22, between the pivots 27, 28 (FIGS. 2 and 15) of the two reel arms 23, 24. The electric programmer 38 releases the electromagnet 87 (FIG. 8) and the arm 24 approaches the arm 23 so that the bobbin is now centered on the two pivots 27, 28, while the electromagnet 122 (FIG. 9) is excited by the programmer to produce the opening of the clamp 112 and allow it to disengage from the bobbin that it has just set up; the continued rotational movement of the cam 109 ensures the pivoting of the two-arm lever 106 in the opposite direction to that of the arrow f6 (FIG. 9) in order to bring the clamp 112 inside the carriage 1.

The camshaft 59 continues to rotate and the cam 83 now pivots the lever with two arms 85 (FIG. 7) in the opposite direction to that of the arrow f5, so that the two arms 23,24 descend so resting the bobbin 30 on the winding cylinder 17 (FIG. 16) whose rotational movement has not been interrupted for lifting the full bobbin and replacing it with an empty bobbin. The wire 22 is clamped between the winding cylinder 17 which rotates and the bobbin which rests on said cylinder, so that the winding of the wire begins and continues normally.

The programmer causes the excitation of the electro-mant 142 (FIG. 10) which actuates the knife 141 for cutting the wire 22 against the anvil 143 inside the suction nozzle 51. The choice of the moment where this knife is actuated makes it possible to adjust the length of the reserve of wire 22a (FIG. 16) which forms, emerging from the suction nozzle, on the spool 30 rotating against the winding cylinder 17, since the 'mouth of the suction nozzle is still in front of said coil. Under the action of the cams 58 and 56 (FIG. 2), the suction nozzle 51 moves back and back down into the carriage 1.

The cycle ends with the lace of an empty bobbin in the clamp. When the electrical contact 127 (FIG. 11) signals that the clamp 112 is in the waiting position in the carriage and that the electrical contact 128 signals the absence of a coil in the clamp, an appropriate electrical circuit excites

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the electromagnet 132, so that the slide 131 advances in the direction of the arrow f7 and causes all the bobbins which are in the corridor 103 to rise, so that the upper bobbin engages in the clamp positioned just at above him. The electromagnet 122 closes the clamp on the coil. The register 135 descends under the action of the electromagnet 136 to prevent the coils 30 from going back down into the corridor 103 while the drawer 131 moves back to its initial position shown in FIG. 11 and the coil 30B, which is located in the lower opening of the hopper 102, falls into said drawer, after which the register 135 rises. The cycle of lifting a full spool and placing an empty spool is complete.

The bolt 46 comes out of the keeper 47 (Figure 1); the electric propulsion motor 32 starts again and drives the carriage 1 in search of a new coil having the diameter sufficient to be lifted.

In the embodiment which has just been described, it has been assumed that the vacuum in the suction nozzle 51 comes from a fan 63 carried by the carriage 1, but it could, in a variant, come from a fan carried by an auxiliary carriage connected to the carriage 1, or else a vacuum sheath running alongside the machine.

In another variant, the initiation device could be used with the formation of a wire reserve described in French patent application No. 79.00718 comprising, at each winding station, a fixed suction nozzle and a fixed hook of special configuration, but, while in the device which is the subject of the aforementioned previous application, an operator must place, by hand, the wire on the suction nozzle and on the hook to cause the rewinding of the winding of the wire with formation of a reserve of wire, in the present device, the adoption of the previous system in question would imply that one adds a suction nozzle and a special hook to each winding station and that the trolley is provided with own means replacing the operator's hand for placing the wire on said nozzle and on the hook.

We will now describe a security system which comprises a probe 6 (FIG. 1) and a special hook 9.

The probe 6 is intended to check the presence and the tension of the portion of wire 22 between the delivery cylinder 12 and the winding cylinder 17. It is pivotally mounted on the carriage 1 by means of a vertical axis 6A (see also Figure 17) and it is biased towards the path of the wire 22 by a spiral spring 6B.

The special hook 9 is intended to cooperate with the thread part 22 between the spinning unit 11 and the delivery cylinder 12. It is also pivotally mounted on the carriage 1 by means of a vertical axis 9A (see also figure 18) and it is elastically urged by a spiral spring 9B against a stop 9C also carried by the carriage 1. It ends in an inclined part 9D situated against the normal path of the wire 22 when the carriage 1 is stopped in front of the station spinning considered. On this inclined end of the hook 9, can pivot a

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pallet 15 which is mounted on an axis 16 which is spring-loaded, by a spiral spring 18, against a stop 19 carried by the hook 9. The pallet 15 can be locked against the stop 19 by the movable core of an electromagnet 20 also carried by the hook 9; when the core of this electromagnet is retracted, as shown in FIG. 19, the pallet 15 can pivot against the force of its return spring 18. When the pallet 15 occupies its standby position shown in FIG. 18 , that is to say against the stop 19, it forms, with the inclined end 9D of the hook, a sort of open clamp in the form of a "V" which encloses the wire 22. Finally, when the hook 9 s away from its stop 9C, it acts on an electrical micro-contact 10 carried by the carriage 1 (FIG. 1).

The operation of this security system is as follows.

If, during its journey, the carriage 1 detects a full spool 21 and if the thread is present between the spinning unit and the delivery cylinder 12, it becomes caught in the "V" formed at the end of the hook 9 and rotates the latter against its return spring 9B, moving it away from the stop 9C and forcing it, at the same time, to actuate the micro-contact 10. The latter then conditions the control circuit of the carriage propulsion motor 32 so as to stop it and allow the lifting of the full reel under the conditions which have been described above in detail. The lifting cycle having ended, the probe 6 (FIGS. 1 and 17) notes whether the wire is present and suitably stretched between the delivery cylinder 12 and the winding cylinder 17. Two cases can then arise. In a first case, when the carriage restarts, the probe 6 finds that the wire is present at this location, by the fact that it is slightly repelled by the wire and immediately actuates a micro-contact (not shown) placed in a circuit power supply of the electromagnet 10 (Figure 19) so that the core of the latter is swallowed and allows the wire to slide along the inclined end of the hook 9 by pushing, in front of him, the pallet 15 which pivots against the force of its return spring 18. As soon as the wire has left the hook 9 and the pallet 15, the latter is returned against the stop 19 by the return spring 18. In the second case, if , when the carriage restarts, the wire is not present in the location considered, it cannot repel the probe and the micro-contact for supplying the electromagnet 10 is therefore not actuated. The pallet 15 is kept locked on the hook 9, against the stop 19, by the core of the electromagnet, so that the wire 22 remains trapped in the "V" formed by the hook and the pallet and that is torn off from the first movement of the carriage.

Finally, if there is no wire between the spinning unit 11 and the delivery cylinder 12, it cannot retain the hook 9 driven by the carriage 1, so that the microswitch 10 is not not actuated and that the carriage propulsion motor supply circuit is not interrupted; the carriage then continues on its way without stopping and does not lift the spool. It will have to be carried out beforehand with a reattachment of the wire.

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10 sheets of drawings

Claims (11)

633835 1. Automatic device for lifting spools of thread and placing empty bobbins on a machine for forming cylindrical or conical windings, in which each winding unit comprises a rotary winding cylinder on which rests a bobbin guided between two arms which can pivot under the action of gravity on a horizontal axis and deviate from each other for the lifting of a full reel and the positioning of an empty reel, characterized by the fact that it comprises a carriage (1) movable on a rail (3) whose configuration allows the carriage to pass successively in front of all the winding units (7) of the machine by moving all around said machine, the carriage comprising a motor (32) propelling the carriage along the rail, driving the carriage always in the same direction in its movement around the machine, means (42 or 43) for detecting a full reel (21) in a unit winding (7) in front of which the chain passes riot (1), means (46,47) for immobilizing the carriage in front of the winding unit in response to a signal emitted by the full reel detection means, means (79,83,89) for lifting the arm (23,24) for guiding the full reel (21) and for letting them recline with an empty reel (30) until said reel rests on the rotary winding cylinder (17), means (66) for cutting the wire (22) between the delivery cylinder (12) and the spool (21), means (85,87) for spreading the arms (23,24) guiding the spool (21) to release the latter and to tighten them against an empty bobbin (30), a magazine (102) of empty bobbins (30), and means for taking an empty bobbin (30) in the magazine (102) and for placing it between the guide arms (23, 24), means (51) for retaining the end of the portion of thread connected to the delivery cylinder, the portion of retained thread being in front of the delivery and winding rollers, but behind the empty bobbin , and a programmer (38) for controlling all the aforementioned means. 2. Device according to claim 1, characterized in that the means for retaining the end of the portion of wire connected to the delivery cylinder (12) consist of a suction nozzle (51). 2 3. Device according to claim 2, characterized in that the suction nozzle (51) is carried by the carriage (1) and is subjected to the action of an up and down control mechanism (51 A, 56 ) as well as forwards and backwards (53,58). 4. Device according to claim 3, characterized in that the suction nozzle (51) is articulated on a lever (53) pivotally mounted on the carriage (1) and its control mechanism comprises cams (56,58) controlled by the programmer (38) and acting on the lever. 5. Device according to claim 3, characterized in that the means for cutting the wire (22) between the delivery cylinder (12) and the coil (21) consist of a cutting blade (66) mounted in the nozzle suction (51) and subjected to the action of cutting control means (73) connected to the programmer (38). 6. Device according to claim 1, characterized in that the means for taking an empty bobbin (30) in the magazine (102) and for placing it between the guide arms (23, 24) consist of a clamp (112) whose jaws (113,114) are actuated by an electromagnet (122) and which is carried by a pivoting arm (106) subjected to the action of a cam (109), the electromagnet and the cam being connected to the programmer (38 ). 7. Device according to claim 3, characterized in that the suction nozzle (51) is connected to a suction fan (63) carried by the carriage (1). 8. Device according to claim 1, characterized in that it comprises means (141, 142, 143) for cutting the reserve wire to the desired length. 9. Device according to claim 8, characterized in that the means (141,142,143) for cutting the reserve wire to the desired length are carried by the suction nozzle (51). 10. Device according to claim 1, characterized in that the carriage (1) carries a releasable hook (9) adapted to engage on the part of the thread (22) between a spinning unit (11) and a delivery cylinder corresponding (12), as well as a sensor (6) for detecting the presence of the wire (22) between the delivery cylinder (12) and the winding cylinder (17), the hook (9) controlling a contact (10) stopping the carriage propulsion motor (32) and the probe controlling a supply contact of an electromagnet (20) for releasing the hook (9). 11. Device according to any one of claims 3 to 10, characterized in that the control mechanism of the suction nozzle gives the latter a movement such that said nozzle itself pushes the full coil released from the arms (23 -24) to a member (28) for discharging the full coils (29).