JPS5938450Y2 - Device to control sliver thickness - Google Patents

Description

[Detailed description of the invention] This invention keeps the weight of cotton called sliver coming out of a spinning machine, such as a card machine, constant even if the thickness of the wrap of a cotton feeder, such as an input wrap roller, changes. This invention relates to a card operation control device.

First, a description will be given with reference to FIG. 1 showing a conventional device.

In the figure, 1 is an electric motor, and 2 is a wrap roller called a wrap, which is wrapped with cotton of a certain thickness and width.

3 is a feed roller that sends out the wrap of the wrap roller; 4 is a reducer that reduces the rotation of the electric motor; 5 is a reducer that reduces the rotation of the electric motor;
6 is a cylinder in which a needle is planted to align the fiber direction of the wraps sent out by the feed roller, 6 is a docker that sends out the wraps with the same fiber direction from the cylinder, and γ is a speed reducer.

Reference numeral 8 denotes a roller that collects a certain width of wrap coming out of the doffer to form a single sliver 9, and 10 represents a speed reducer that determines this rotation.

11 is a sliver can for storing the sliver.

Next, the VC operation will be explained.

The electric motor 1 is kept at a constant rotation speed, and the motor 6 is
By selecting the reduction ratios of the reducers 7 and 10 so that the roller 8 also has a constant rotation speed, the speed at which the sliver 9 comes out becomes constant.

In addition, since the feed roller 3 also rotates at a constant speed determined by the reducer 4, the thickness of the sliver 9 can be determined mainly by the ratio of the rotation speed of the dot 6 and the feed roller 3, and therefore the weight per unit length. becomes constant.

However, it is normal for the wrap of the wrap roller 2 to be uneven. For example, if the wrap becomes thicker, the feed roller 3
Since the rotation of the sliver 9 is constant, the amount of feed increases and the sliver 9 becomes thicker.

For this reason, when measuring the weight of a full sliver can 11, it becomes heavier when the thick wrap continues for a long time, and becomes lighter when the opposite is the case.

Therefore, when the weight is heavy, the number of revolutions of the feed roller 3 is adjusted by changing the reduction ratio of the reducer 4 to reduce the amount of feed for low combs and laps.

However, this method has the drawback of measuring the weight of the sliver can, which causes a time delay, and requires the operator to stop the machine and replace the gear, which is time-consuming and requires continuous correction. It had the disadvantage that it could not be used.

The present invention solves these drawbacks, and the embodiment shown in FIG. 2 will be explained below.

In the figure, 12 is a sensor that detects the rotational speed of the doffer 6, and 13 is a converter that converts this output into a DC voltage, and the higher the rotation speed, the lower the voltage.

14 is an induction clutch that controls the input rotation of the reducers 7 and 10 that determines the rotation of the doffer 6 and roller 8; 141 is its excitation coil; if a large amount of current flows through this coil, the induction clutch The slippage is reduced, and therefore the output rotation, the slip reducer 7,
The speed of input rotation of 10 becomes higher.

15 is the excitation coil 1 of the induction clutch 14
This is a setting device for setting the input of 41, and is a variable resistor connected to the power supplies of (g) and (c).

16 is a resistor for inputting the output of the setting device 15 to the amplifier 17, 18 is a resistor for inputting the output of the converter 13 to the amplifier 17, and 19 is a feedback resistor.

Since the polarity of the setting device 15, converter 13, and amplifier 17 is selected as shown in the figure, for example, if a high-speed side voltage is applied to the setting device 15, the output of the amplifier 17 will be the voltage of O. Therefore, the output rotational speed of the induction clutch 1-4 increases, and the rotation of the converter 6 increases.

This increases the output of sensor 12 and increases the output of converter 13.
Output increases.

The difference between the e output of Even if the difference is extremely small, a sufficiently large current can flow through the excitation coil 141 of the induction clutch 1-4.

First, if the setting device 15 is set arbitrarily, the doffer 6 will rotate at a rotational speed extremely close to the set value.

A differential transformer 20 is mechanically connected to the roller 8 and outputs an output according to the thickness of the sliver 9.

Here, pressure is applied to the roller 8, and the sliver 9 passing through this portion is crushed, and the thickness is proportional to the weight per unit length, so the thickness can be controlled.

21 is a converter, and when the sliver is thicker than the standard, the output of the converter 21 becomes e output.

22 is a setting device for the thickness of the sliver 9, (→, ni)
It is connected to the power supply, and the ←) side is thick and the (to) side is thin.

23 and 24 are input resistors, 25 is an amplifier, and 26 is a feedback resistor.

Since the polarities of the converter 21 and setter 22 of the differential transformer 20 are selected as shown in the figure, the input to the amplifier 25) shows the difference between the converter and the setter, and the switching deviation. This signal is inverted and amplified by amplifiers 2 and 5.

Reference numeral 27 is an adjustment section for processing the above-mentioned inverted and amplified deviation, and so-called proportional, integral, and differential elements can be appropriately combined according to the specifications required for the sliver 9.

28 is an input resistor, which is connected to the input of the amplifier 29 by the adjustment section 27.
Enter the output of

30 is a sensor that detects the rotation speed of the feed roller 3;
31 is a converter that converts this output into a DC voltage, and the higher the rotation speed, the higher the voltage.

32 is a resistor that inputs this output to the amplifier 29.

33 is a converter 1 which shows an output corresponding to the rotation of the doffer 6;
3 is a resistor that inputs the output of 3 to the amplifier 2, and 34 is the amplifier 2.
9 feedback resistance.

3-5 is an induction clutch and a 351 box excitation coil. If a large amount of current flows through this coil,
The input rotational speed of the reducer 4 increases, and therefore the rotation of the feed roller 30 increases.

Since the converter 31, 13, setter 22, and amplifier 25 are selected to have the polarity shown, the e input of the amplifier 29 is based on the difference between the rotation speed of the feed roller 3 and the rotation speed of the docker 6. ,
Since the signal obtained by processing the deviation signal from the setting device 22 and the differential transformer 20 is inverted and amplified by the amplifier 29, the thickness of the sliver 9 is adjusted according to the setting value of the setting device 22. , the output of the amplifier 25 is O,
At this time, if the output of the adjustment section 27 is also 0, the resistance 32.3
The feed roller 3 follows the docker 6 at a ratio determined by 3.

Next, the operation will be explained.

When the docker 6 is set at a constant rotation by the setter 15 and the setter 22 is set to the reference position (output 0), the adjustment section 2
The output of 7 becomes O.

Therefore, only the outputs of the converters 31 and 13 are added to the input of the amplifier 29, and the output of the amplifier 29 causes the feed roller 3 to follow the dots so that the sliver becomes the standard sliver.

Next, when you move the setting device 22 in the thicker direction, the ■output appears,
Since the difference with the converter 21 and the deviation become greater than in the previous state, the output of the amplifier 25 increases to e, and therefore the output of the adjustment section 27 also increases to e.

As a result, the output of the amplifier 29 increases to ■, the current of the induction clutch 351 decreases to 1, the rotation of the feed roller 3 increases, and the number of laps supplied increases.
The sliver 9 becomes thicker ○ This increases the e output of the converter 21, and the setting device 2
2, the deviation appearing at the e input of the amplifier 25 is reduced by 75 points, but since the feedback resistor 26 is selected to be larger than the resistors 23 and 24, the output is large.

Finally, the feedback resistor 26 and the resistors 23, 2
If the amplification rate defined by 4 is set sufficiently high, the above deviation can be made sufficiently small.

Note that if the amplification rate is increased too much, the system tends to become unstable, so if the constants of the proportional, integral, and differential elements of the adjustment section 2γ are appropriately determined, the sliver 9 can be adjusted without increasing the amplification rate too high.
The thickness can be made equal to the setting value of the setting device 22.

As described above, the present invention uses a differential transformer to detect the thickness of the sliver and automatically controls the rotation of the feed roller so that the thickness becomes the set value.
The influence of this on the sliver 9 can be minimized by immediately automatically controlling the large and small irregularities in the lap of the sliver 9.

Note that there are other cotton feeding devices such as air chutes, but the present invention can be applied to them as well.Also, the feed roller is driven by the induction clutch 35, and the dosing device is driven by the induction clutch 1.
4, these induction clutches 35 and 1
Since the coils 351 and 141 of No. 4 are independently excited by the differential output between the thickness setting device and the differential transformer, and the differential output between the rotation speed of the doffer and the set rotation speed, each induction clutch 14.35 can be driven by a common electric motor (that is, the electric motor that drives the cylinder), and there is no need to change the gear of the reducer 4, making handling easier and allowing the use of the card motor of the conventional device. It also has the advantage of being excellent in terms of remodelability.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a conventional device, and FIG. 2 is a configuration diagram showing an embodiment of this invention. In the figure, 1 is an electric motor, 3 is a feed roller, 6 is a docker, 8 is a roller, 9 is a sliver, 14.35 is an induction clutch, 20 is a differential transformer, 21.31 is a converter, 22 is a setting device, 25 .29 is an amplifier, and 27 is an adjustment section. In addition, the same symbols in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In the card device that forms sliver from the cotton feeding device,
A differential transformer that detects the thickness of the sliver, a thickness setting device that sets the thickness of the sliver and outputs the set value, and a difference between the output of this thickness setting device and the differential transformer. It has a first widening device that increases the width, and a first coil whose excitation force is controlled according to the output of the first widening device, the rotational speed of a feed roller that sends out the lap, and the rotational speed of a docker. The second electromagnetic clutch includes a first electromagnetic clutch that drives the feed roller, and a second coil that is excited by a differential output between the rotation speed of the doffer and a set rotation speed. What is claimed is: 1. A card operation control device comprising: an input shaft side of each of the first electromagnetic clutch and the second electromagnetic clutch connected to an electric motor that drives a cylinder.