JPH0369823B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a yarn winding machine for a textile machine, and more particularly to a turret type yarn winding machine.

<Prior art> A turret-type yarn winding machine is a yarn winding machine in which two bobbin support tubes are installed on a freely rotatable turret, and a plurality of bobbins are inserted into the bobbin support tube and are continuously fed. The yarn is alternately wound around bobbins inserted into the two bobbin support tubes.

The above turret type yarn winding machines generally include a spindle drive type in which the bobbin support cylinder is directly driven to rotate, and a spindle drive type in which the bobbin or the surface of the yarn layer of the wound yarn is brought into contact with a rotating friction roller. There is a friction type that indirectly rotates the bobbin support cylinder. The present invention is applied to the latter friction type yarn winding machine.

In the above friction type yarn winding machine as well, when the bobbin at the winding position is fully wound and the turret rotates, that is, the rotation of the fully wound package after it is separated from the friction roller. Some machines are equipped with auxiliary rotational drive means that directly rotates the bobbin support cylinder so that the speed does not decrease.

The inverter controlling the auxiliary rotation drive means (hereinafter simply referred to as auxiliary motor) simultaneously controls two bobbin support cylinders.

When the bobbin at the winding position is fully wound, the turret
Rotate 180 degrees. At that time, until the empty bobbin in the standby position is moved from the standby position to the winding position, the inverter is used to increase the rotation speed from zero to the rotation speed Va, which is the same circumferential speed as the friction roller. Rotationally driven by a controlled auxiliary motor.

<Problems to be Solved by the Invention> As mentioned above, the above inverter controls the frequency of the two bobbin support cylinders simultaneously, so when the empty bobbin is raised to the above rotation speed Va, the rotation speed of the fully wound package is also increased to Va. It will rotate until. In reality, although the rotational speed does not rise to the above-mentioned rotational speed Va due to the inertial force due to the weight of the wound yarn, the circumferential speed of the fully wound package definitely increases compared to when rotational drive is applied by the friction roller.

Therefore, the yarn tension increases when switching the yarn from the full package to the empty bobbin, resulting in problems such as yarn breakage or failure to successfully perform the yarn change. In particular, when winding a stretched yarn, the above problem occurs more frequently.

<Means for Solving the Problems> The present invention detects and stores the rotational speed of the fully wound bobbin when the bobbin at the winding position is fully wound and the turret starts rotating, and detects and stores the rotational speed of the fully wound bobbin when the bobbin is fully wound at the winding position and the turret starts rotating. The rotational speed of the fully wound bobbin is successively compared with the stored rotational speed, and the rotational speed of the fully wound bobbin is controlled based on the comparison result.

<Function> Based on the rotational speed of the fully wound bobbin at the start of the turret rotation, the rotational speed of the fully wound bobbin during the turret rotation does not deviate significantly.

<Example> Fig. 1 schematically shows a yarn winding machine 1 showing this embodiment, 2 is a main body of the yarn winding machine, and 3 is the main body 2.
It shows the control unit installed in the

The configuration of the yarn winding machine main body 2 will be explained. This machine feeds two yarns Y continuously from the top of the figure.
The bobbins B1 and B2 are used to alternately and continuously wind the bobbins, and are roughly divided into a slide box part 4 and a turret part 5, which can be raised and lowered.

The slide box section 4 includes a friction roller 6 which applies contact pressure to the winding bobbin B1 (described later) and contacts the bobbin B1 or the yarn layer surface of the winding yarn to rotate the winding bobbin B1, within the traverse range. A traverse device 8 has a traverse guide 7 that traverses the yarn, and the relationship between the yarn Y and the traverse guide 7 is used when transferring the yarn from a fully wound bobbin to an empty one of the two bobbins. Yarn shifting guides 9 for uncoupling and moving the yarn Y out of the traverse range are supported by slide boxes 10, respectively.

In the turret section 5, the turret 11 can be rotated about a shaft 13 by a motor 12, and the turret 11 has two bobbin support cylinders 1.
4,15 are supported. The support tubes 14, 15
are rotatable by auxiliary motors 16 and 17, respectively. Each support cylinder 14, 15 has a bobbin B.
A plurality of supporting cylinders 1 and B2 are mounted, and one of the supporting cylinders is located at the winding position M, and the other is located at the standby position N. When the yarn Y is fully wound on the bobbin B1 at the winding position M, the turret 11 rotates 180 degrees, switches the positions of the bobbin support tubes 14 and 15, and empties the yarn Y from the fully wound package P. Bobbin B2
Transfer to. The 180 degree rotation of the turret 11 is detected by a detector (not shown). Gears 18 and 19 for rotational speed detection are fixed to the bobbin support tubes 14 and 15, respectively, and the gears 18 and 19 rotate together with the bobbin support tubes 14 and 15. 20, 21
indicates a gear sensor which is a rotation speed detector.

Next, the configuration of the control section 3 will be explained. A signal output from the CPU 30 is input to a D/A converter 32 via a bus line 31. The analog signal output from the D/A converter 32 is input to an inverter 33.
The inverter 33 controls each auxiliary motor 1 of the bobbin B1 and bobbin B2 by the analog signal.
6 and 17 are controlled simultaneously and in the same way. The motors 16 and 17 are activated and deactivated by ON or OFF signals from the CPU 30 via switches 34 and 35, respectively.

The rotation speed detected by the gear sensors 20 and 21 is only the rotation speed of the bobbin B1 located at the winding position M.
Each gear sensor 20, 21 is inputted to the CPU 30 via a switch 36.
It is connected to the. In order to prevent the wiring from being twisted due to the rotation of the turret 11, the signal from the gear sensor 20 is sent to the switch 36 via a slip ring 37, as shown in FIG. The slip ring 37 includes a fixed plate 38 made of a conductor fixed to the rotating shaft 13 of the turret 11;
A sliding brush 3 that can slide on the circumference of the fixed plate 38
It consists of 9. When the turret 11 rotates, the stationary plate 38 does not move, but the gear sensor 20 and the sliding brush 39 rotate. A similar structure using a slip ring is also applied to the other bobbin and between the auxiliary motors 16, 17 and the inverter 33.

The CPU 40 for system control is listed above.
It is connected to the CPU 30 by a bus line 41 and sends and receives signals. The CPU 40 also controls the motor 12 for rotating the turret 11.

The operation of this embodiment configured as above will be explained with reference to the flowchart shown in FIG.

The bobbin B1 located at the winding position M is rotationally driven by the friction roller 6 and winds the yarn Y. During the winding, the auxiliary motors 16 and 17 are not driven. When a predetermined amount of yarn Y is wound up, the CPU 30 issues a full winding signal (step). Due to the full wind signal, switch 3 is first activated.
5 becomes "through" and bobbin B2 starts rotating (step). Next, the motor 12 is operated from the CPU 30 via the system control CPU 40 to rotate the turret 11 (step).
At the same time as the turret starts rotating, that is, the fully wound package P and the friction roller 6 are separated, the switch 34 is opened and the bobbin B1 starts rotating (step).

The upper limit of the rotational speed of the auxiliary motors 16 and 17 is set by an inverter 33 so that the circumferential speed of the empty bobbin is the same as the circumferential speed of the friction roller 6. It is controlled by the CPU 30. The auxiliary motor 16 rotates to wind up the continuously supplied yarn Y even while the turret 11 is rotating, and the auxiliary motor 17 rotates when the empty bobbin B2 is at the winding position M.
In order to be able to start winding the yarn Y immediately when the winding reaches the end, it starts rotating at the same time as the full winding signal.

The rotational speed Vc of the bobbin B1 at the start of the turret rotation (step) is detected by the gear sensor 20 (step), and the rotational speed Vc is detected by the CPU 30.
Store it in the internal memory (step).

Now, let Va be the peripheral speed of the friction roller 6, that is, the yarn speed of the wound yarn, and let Vb be the rotation speed of the empty bobbin B1 to obtain the speed Va, and let the peripheral speed when the package P is fully wound be If the rotational speed of the package P for obtaining Va is Vc, the rotational speed of the bobbin B1 at the winding position M is driven by the friction roller 6 at a constant circumferential speed Va. As the roll becomes thicker, the rotation speed gradually decreases.
Now, assuming that the diameter of the fully wound package P is k times the diameter of the empty bobbin B2 (k>1), the relationship between the rotational speeds Vc and Vb of both under the condition of constant circumferential speed is Vc = (1/k) ×Vb.

As described above, the rotational speed set by the inverter 33 for the auxiliary motors 16, 17 is such that the rotational speed of each bobbin B1, B2 becomes Vb.
Auxiliary motors 16 and 17 after turret 11 rotations start
The rotation of the bobbins B1 and B2 increases so as to reach the above-mentioned set rotational speed Vb.

In the case of the empty bobbin B2, the circumferential speed when the rotational speed Vb is reached is Va, and there is no problem. However, in the case of a fully wound package P, the circumferential speed of the package P when the rotational speed of the package P reaches Vb is (k x Va), and the rotational speed of the fully wound package P changes from Vc while the turret is rotating. (k×Vc). Due to such an increase in rotational speed, the yarn Y wound around the fully wound package P
However, in this embodiment, the increase in yarn tension is prevented as follows.

At the same time as the rotational drive of the auxiliary motor 16 starts, the rotational speed Vp of the bobbin B1 is sequentially detected and the CPU
30 (steps). The captured rotational speed Vp is compared with a value obtained by multiplying the stored rotational speed Vc by an allowable value (α) (step). The value of the tolerance (α) is given by a number in the range of 1.01≦α≦1.03, for example. Note that the above Vp is given as a variable.

If the rotational speed Vp is smaller than (α×Vc), the process advances to NO and the same operation is repeated again from the step.

If the rotational speed Vp is equal to or greater than (α×Vc), the process advances to YES, and only the auxiliary motor 16 of the bobbin B1 at the winding position M is activated.
A motor rotation stop command is issued from the CPU 30 via the switch 34, and the rotation of the motor 16 is stopped (step).

After the auxiliary motor 16 is stopped, or between the above steps, it is checked whether the turret 11 has rotated 180 degrees (step). If 180 degree rotation of the turret is confirmed, proceed to step. The subsequent explanation will be given later. In step 1, if the turret 11 has not rotated 180 degrees, proceed to step, and similarly in step /, proceed to step. In this step, the bobbin B1 is again
The rotational speed Vp is detected, the rotational speed Vp is compared with the rotational speed Vc (step), and if the speed Vp is not greater than the speed Vc, the process advances to YES, and the above operation is repeated from step. The speed Vp is the speed
If it is above Vc, proceed to NO and repeat the same operation from step.

When a detector (not shown) detects that the turret 11 has rotated 180 degrees, the motor 12 stops driving to stop the rotation of the turret 11 (step), and the rotational drive of the auxiliary motors 16 and 17 is stopped (step). Step), transfer the yarn Y from the full package P to the empty bobbin B2 (step), forcibly stop the inertial rotation of the full package P mechanically with a stopper (not shown), and carry out the package P (step). step).

FIG. 4 shows the time course of the rotational speed Vp of the bobbin B1 due to the above operation. The bobbin B1, which was rotating at the rotational speed Vc when fully wound, increases its speed by driving the auxiliary motor 16 (curve L1
). When the speed Vp reaches (α×Vc), the auxiliary motor 16 stops driving, and the bobbin B
1 rotates by inertia while gradually decreasing its speed (the part shown by curve L2). Usually, the curve L2
The rotation of the turret 11 ends during the period indicated by . When the speed Vp reaches the speed Vc while the turret is rotating, the auxiliary motor 16 is operated again to increase the bobbin rotation speed Vp (the portion shown by curve L3). As described above, the speed Vp is calculated as Vc≦Vp≦
The tension is maintained within the range α×Vc, and winding can be performed without increasing the tension of the yarn Y.
Furthermore, by suppressing the increase in yarn tension, failure to transfer the yarn Y from the full package P to the empty bobbin B2 is prevented.

<Effects of the Invention> As explained above, according to the present invention, it was possible to prevent the yarn tension of the yarn taken on the fully wound bobbin during rotation of the turret from increasing. Therefore, the occurrence of thread breakage or failure of thread transfer, which occurs when transferring thread from a full bobbin to an empty bobbin, is completely eliminated. Furthermore, it has become possible to wind the stretched yarn, which conventionally has frequently been broken due to the generation of yarn tension, without any problems.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, and FIG.
The figure is a side view showing the slip ring installed between the gear sensor and the switching device, FIG. 3 is a flowchart showing the operation of the embodiment shown in FIG. 1, and FIG.
FIG. 3 is a graph diagram showing the temporal progression of the rotational speed of the fully wound bobbin according to the illustrated embodiment. 1... Yarn winder, 11... Turret, 14, 15
...Bobbin support tube, 20, 21...Rotation speed detector, 3
0...CPU, Y...Yarn, B1, B2...Bobbin, M
... Winding position, N... Standby position.

Claims (1)

[Claims] 1. Two bobbin support cylinders into which a plurality of bobbins are inserted and for winding yarn, one of the two bobbin support cylinders is rotatably supported in a winding position and the other in a standby position, and A yarn winding method for a yarn winding machine having a turret that mutually switches the position of each bobbin support cylinder, in which the rotation speed of a fully wound bobbin at the start of turret rotation is memorized, and the The rotational speed of the full-wound bobbin during rotation of the turret is successively compared with the stored rotational speed, and the rotational speed of the full-wound bobbin during rotation of the turret is controlled based on the comparison result. Winding method.