JPS5831405B2 - Device to control sliver weight - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that makes the weight of fed fibers constant by controlling the feeding speed of the fibers.

Conventionally, the weight of the sliver measured by a differential transformer was converted into an electrical signal to automatically control the transmission at the sliver supply section, which was separated by a distance, but the detection point and operating point were approximately 3.
Due to the distance of ~5 m, the time the sliver takes to reach the operating point, that is, the gear changed by the transmission, and then the detector, that is, the differential transformer, is ``dead time'', and it is shorter than this time. The disadvantage is that it cannot be controlled.

In addition, from another point of view, there is a drawback that only the internal unevenness of the sliver can be controlled.

The present invention overcomes these drawbacks and will be explained in the following figures.

The figure shows one embodiment of the present invention, in which 1 is an electric motor;
Reference numeral 2 is a so-called wrap roller, which is a roller wrapped with a raw material such as cotton of a certain thickness and width.

3 is a feed roller that sends out the wrap of the wrap roller 2; 4 is a speed reducer that reduces the rotation of the electric motor 1; 5 is a cylinder that is equipped with needles that align the fiber direction of the wrap fed by the feed roller 3; , 6 is a speed reducer, 7 is a docker for stripping the thin cotton strips with uniform fiber direction coming out of the cylinder 5 from the cylinder 5, 8 is a speed reducer, and 9 is the thin strip cotton coming out from the doss fan 7. This is a measuring roller that applies pressure to the sliver and sends it out as a rope called sliver 10.

The machine configurations 1 to 9 described above are generally referred to as card machines.

U is a differential transformer that detects the thickness of the sliver 10, 111 is an iron core, 12 is a rotation detector that detects the rotation speed of the measuring roller 9, 13 is a speed reducer, and 14 is an upper and lower roll under pressure. A middle roller 15 is a reducer, and 16 rotates at twice the rotational speed of the middle roller 14 when the sliver 10 is in a normal state, and applies pressure to the sliver 10 to give twice the draft. The front roller is made up of upper and lower rolls.

U is an electromagnetic clutch that controls the rotational speed of the front roller 16 via a reduction gear 18, and is, for example, an induction clutch.

171 is an excitation coil, 172 is a rotation detector, and 19 is an electromagnetic brake that rotates on the same axis as the induction clutch 17, for example, an induction brake.

191 is an excitation coil, 20 is its power source, 21 is a can that stores the sliver 10 spun from the front roller 16, 22 is a speed reducer, and 23 is an automatic/manual switching switch, which is turned off when manual. .

24.25 is a converter that converts the output of the rotation detector 12.172, and when a pulse type is used for the rotation detector, it becomes a frequency type positive converter, and when a linear type is used, it becomes an amplifier. This is the result.

26 is an adder that outputs the sum of the outputs of the converters 24 and 25, and 27 is an inverting amplifier that amplifies the output of the adder.

Since the input polarity is as shown in the figure, the output of the adder represents the difference between the two.

Further, the output of the reversing amplifier 27 is output from the front roller 16.
is applied to the excitation coil 171 of the induction clutch 17, which determines the rotational speed of the induction clutch 17.

28 is an amplifier for amplifying the output of the differential transformer 11; 29
is a weight setter for the sliver 10; 30 is an adder that adds the outputs of the inverting amplifier 28 and the weight setter 29;
The polarities are as shown in the figure, and the difference between the two can be seen in the output.

31 is an inverting amplifier that amplifies the output of the adder 30.

Next, the operation will be explained.

When the switch 23 is set to 0FFL in manual mode, when the card machine rotates at a certain constant speed, the measuring roller 9 rotates at a speed commensurate with this, for example, N1 (rI"'), and the converter 24 adjusts the voltage accordingly. occurs.

Therefore, if this voltage is set to 1 and the output of the converter 25 that generates an output corresponding to the rotation speed of the induction clutch 17 is set to 2, the output of the adder 26 is (2 - 2,)
If this is ■, the inverting amplifier 27 outputs ○, the current flowing through the excitation coil 171 of the induction clutch 17 decreases, the generated torque also decreases, and the rotational speed decreases.

Therefore, (V2 V, ) becomes smaller.

On the other hand, if the amplification rate of the inversion amplifier 27 is sufficiently large,
The above (■2 - ■1) becomes close to O, and if the rotational speed of the front roller 16 at this time is N2 (rll), then in this state the ratio of the rotational speed of the middle roller 14 and the front roller 16 becomes draft. It is what it is.

In other words, while the sliver 10 passes between the middle roller 14 and the front roller 16, it is doubled in size.

Next, let's talk about automatic time.

If the sliver 10 detected by the measuring hanger 9 has the standard thickness, the output of the reversing amplifier 31 becomes O, so the reversing amplifier 27 suppresses the draft of the middle roller 14 and the front roller 16. Keep it at K.

Then, when the slider 10 changes by ±10%, the adder 3
The output of 0 becomes a factor of ±10, and the output of the inverting amplifier 31 becomes +
At 10%, the input of the adder 26 becomes a non-tenth factor.

Therefore, the induction clutch U is energized by the action of the reversing amplifier 27 which has a sufficiently large amplification rate, and as a result, the rotational speed of the front roller 16 changes by ±10%, and the sliver 10 changes by ±10%. This cancels out the changes in

In the above, the weight of the sliver 10 is detected by the measuring roller 9, and the front roller 16, which changes the speed of the sliver 10 coming out from the measuring roller 9, is controlled.
Although we have talked about so-called open loop control, this configuration can be reversed to control the sliver 10 coming out from the front roller 16.
Of course, the present invention can also be applied to a so-called closed loop system in which the front roller 16 is controlled by detecting the weight of the front roller 16.

Further, although an example has been described in which the middle roller 14 and the front roller 16 are provided at the exit of the card machine for drafting, this can of course be applied to a filament machine as it is, and can also be applied to a spinning machine and the like.

Furthermore, an example in which a differential transformer is used as a detector for the weight of the sliver 10 has been described. Of course, the weight can be measured using a capacitance type or a pneumatic type in which the sliver 10 is passed through an orifice-shaped nozzle and the weight is measured based on the pressure generated at this part.

As described above, in the present invention, since the sliver 10 taken out from the card machine is draft-controlled by the two relatively close rollers 14 and 16, even small irregularities in the sliver 10 can be corrected, and the spun sliver 10 can be corrected. When changing the width of the sliver to a larger width or when changing the dotting speed, it is only necessary to change the amplification rate of the amplification device using the adjustment resistor, and a constant sliver 10 can then be obtained automatically.

In addition, since the control system that determines the standard draft during manual operation, that is, from the middle roller 14 to the front roller 16, is a so-called closed loop control, a constant draft is maintained regardless of the deterioration of the mechanical system, and the draft during automatic operation is controlled. This draft is stably controlled depending on the output.

In addition, since an electromagnetic clutch is used as a transmission, the device for controlling the weight of the sliver 10 has a small inertia and excellent responsiveness.

[Brief explanation of drawings]

The figure shows the configuration of the device for controlling the weight of sliver according to the invention. In the figure, 10 is a sliver, 11 is a detector, 14 is a first roller, 16 is a second roller, 17 is an electromagnetic clutch, 21 is an automatic/manual changeover switch, 13.27 is a reversing amplifier, and 29 is a This is a sliver weight setting device.

Claims (1)

[Claims] 1 a first roller that determines the feed amount of the sliver; a second roller that determines the feed amount of the sliver fed by the first roller to control the weight of the spun sliver;
a detector for detecting the weight of the sliver; an inverting amplifier for amplifying the difference between the output of the detector and the output of the weight setter; and a second amplifier controlled by the output of the amplifier. A device for controlling the weight of the sliver, comprising an electromagnetic clutch that controls the rotation speed of the roller, and an automatic/manual changeover switch inserted between the output side of the reversing amplifier and the input side of the electromagnetic clutch. .