JPH02216227A - Measurement of rotary bobbin diameter in roving frame - Google Patents

Abstract

PURPOSE:To provide the title measurement procedure intended for accurately determining the rotary bobbin diameter in roving frames and to be applied to cone drumless roving frames, so designed that the diameter of a bobbin winding roving is measured through the change in the rotational angle between a rotating flier and its presser. CONSTITUTION:Optical sensors A and B are located so as to face a flier 3 and a presser 4 (solid line). Using the distance l between the center of a bobbin 5 and the flier 3, the distance L between the flier and the tip 4' of the presser 4 and the rotational (central) angle beta, the diameter x of the bobbin winding roving can be determined.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for measuring the diameter of a rotating bobbin in a roving frame.

BACKGROUND OF THE INVENTION Conventionally, roving machines that have been practically used are of the so-called bobbin lead system, in which roving is wound onto a bobbin by the difference between the bobbin rotational speed and the flyer rotational speed, which is smaller than the bobbin rotational speed. In this method, the roving sent out from the front roller is slightly stretched due to the resistance while passing through the flyer presser of the flyer and being wound onto the bobbin (this is called "inconstant draft"). , the winding speed of the roving is slightly faster than the spinning speed from the front roller. The fluctuation in the weight of the roving that causes the yarn count fluctuation in this method is due to the fluctuation in the irregular draft amount, and in order to adjust this irregular draft amount to a constant value from the beginning of winding to the end of winding of the bobbin, various methods have been used in the past. The number of revolutions of the bobbin is controlled by the following method.

That is, the spinning speed from the front roller: Vex/w
in, flyer rotation speed Nf r, p, m, bobbin winding diameter: Dbc, w, bobbin rotation speed at that time 2N
b r, p, m, undefined draft amount: a, (N
b −Nf ) yr·Db = a·V.

In a normal roving frame, the rotation speed Nr of the flyer and the spinning speed V are constant during spinning operation, so the rotation speed Nb of the bobbin is inversely proportional to the bobbin diameter Db. For this reason, a control mechanism that uses a speed cam to control the number of rotations of the bobbin is employed.

However, it is very difficult to spin rovings with different spinning conditions at a constant and variable draft amount using one type of cone drum or cam.

Therefore, a method has been proposed in which the bobbin diameter Db is directly measured along with the bobbin rotation speed Nb and the flyer rotation speed Nf, the measurement results are sent to a computer, and the bobbin rotation speed is controlled so that the bobbin rotation speed does not fluctuate due to the irregular draft amount. (“
"Cone drumless roving frame", for example, 1986-15
(Refer to Publication No. 29) By the way, the method of measuring the bobbin IDb mentioned in such a method of controlling the number of rotations of the bobbin is limited to a method that does not damage the roving wound around the bobbin. , which used ultrasonic waves to measure the distance to the bobbin surface or flyer presser. However, all of these measuring devices are expensive and cannot be applied to a roving frame, and in particular, those using ultrasonic waves are not sufficiently accurate.

Furthermore, the method of measuring the distance to the flyer presser using laser beams or ultrasonic waves requires a mechanism for synchronization (detecting the passage of the flyer presser), making the device complex.

Other methods such as laser Doppler are also possible, but
The surface speed is high, making it difficult to apply and cost-effective.

In addition, when using a photoelectric sensor consisting of a normal emitter and receiver, the diameter is measured by blocking the light beam by the wound roving, so it is necessary to arrange a large number of photoelectric sensors. However, due to the diffusion of light, the sensor pitch could not be narrowed, and accurate measurement of the bobbin diameter could not be expected.

Problems to be Solved by the Invention Conventional methods for measuring the diameter of the rotating bobbin in roving frames are either insufficiently accurate or cannot be applied to many types due to cost considerations, and in practice It is difficult to apply it to a roving machine.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for measuring the diameter of a rotating bobbin, which eliminates the drawbacks of the conventional technology and allows the realization of a practical cone drumless roving frame.

Means for Solving the Problems In order to achieve the above object, the method of the present invention is such that as the bobbin diameter increases, the presser moves away from the line connecting the flyer and bobbin centers, and conversely, the presser moves away from the line connecting the flyer and bobbin centers. The angle between the center and the line connecting the center of the alessor and the bobbin (
This method was developed based on the fact that the rotation angle (rotation angle) gradually decreases, and the amount of change in this angle is inversely proportional to the radius of the bobbin.The rotation angle between the rotating flyer and the presser of this flyer is measured. , the diameter of the bobbin around which the roving is wound is determined by the amount of change in this rotation angle.

Operation Referring to Fig. 2, optical sensors A and B are installed at positions facing the flyer and presser (solid line) just when the presser of the flyer is in contact with the bare bobbin, and the diameter of the bobbin is As the roving is wound up, the size gradually increases, and the case where the flyer has just rotated to the position of the optical sensor A is shown by the dotted line.

If the distance from the bobbin center 0 to the flyer = 1, the distance from the flyer to the tip of the presser, and the rotation (center) angle is β, then χ” + 12-21χeO8β = L 2
(2) Using equations (2) to (2), the diameter of the bobbin around which the roving is wound can be determined from the rotation angle β.

EXAMPLE Hereinafter, a case will be described in which an example of the method of the present invention is applied to the roving frame shown in the drawing.

As shown in FIG. 1, the roving 2 spun from the front roller 1 of the roving frame is guided from the top of the flyer 3 to the flyer arm 3a, the presser 4 and its tip 4', and wound around the bobbin 5. It has been taken. Note that 6 is a bare bobbin.

The fryer 3 is driven by a drive shaft 9 via a gear 10, the bobbin 5 is fitted onto a spindle 14, and the spindle 14 is driven via a gear 13 from a drive shaft 12 in a bobbin rail 11 that moves up and down. There is. Note that this is a bobbin lead method in which the number of revolutions of the bobbin is higher than the number of revolutions of the flyer.

In the example of FIG. 1.2, optical sensor A.

B is provided at a position facing the flyer 3 and the presser 4 when the tip 4' of the presser 4 of the fryer 3 is in contact with the bare bobbin 6, and furthermore, the flyer arm 3a and the tip 4 of the presser A reflective detection plate 7 is attached to '. A gear 8a is meshed with a gear 10 that drives the fryer 3, and an encoder 8 is attached to the gear 8a to measure the rotation angle of the fryer 3.

Note that the fryer 3 is operated at a constant speed, for example, approximately 1500/r.
, p, are driven by wheels, but the encoder 8 measures the rotation angle more accurately.

As shown in FIG. 2, when two optical sensors A and B are arranged, the rotation angle β between the fryer 3 and the presser 4 at the start is β. is equal to, so flyer 3
and the amount of change in the closing rotation angle of the presser 4 from the beginning, for example, the rotation angle β. - It is easy to measure the increase in rotation angle α of rotation angle β. That is, as shown in FIG. 3, when the fryer 3 is detected by the optical sensor A, counting of pulses of the encoder 8 is started based on the signal, and the optical sensor B detects the presser 4 and the signal is It will be easily understood from FIG. 2 that when counting is stopped, the number of pulses during this period corresponds to the rotation angle α.

In this example, instead of encoder 8, the circuit shown in FIG. 4 is connected to sensor A and sensor B, and the number of pulses counted by counter 1 is divided by the number of pulses counted by counter 2. By multiplying by 360, the rotation angle a is obtained as the amount of change in the rotation angle β between the fryer 3 and the presser 4 of the fryer. In other words, the same effect as when the encoder 8 is attached is obtained.

As in the above example, when the encoder 8 is attached to the fryer 3, the number of sensors can be reduced to one, and the rotation angle β is measured by the number of pulses. The number of pulses must be confirmed.

Effects of the Invention According to the method of the present invention, the diameter of a rotating bobbin in a roving frame can be accurately measured in a non-contact manner using an inexpensive measuring device.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of a roving frame for carrying out the method of the present invention;
FIG. 2 is a plan view of the main parts of the roving frame, FIG. 3 is a flow chart of one embodiment of the method of the present invention, and FIG. 4 is a circuit diagram of another embodiment of the method of the present invention. 2... Roving, 3... Flyer, 4... Presser 4'... Presser tip, 5... Bobbin, 6...
...Bare bobbin, 7...Detection plate, 8...Encoder, 9, 12...Drive shaft, 11...Bobbin rail, A,
B...Sensor.

Claims (1)

[Claims] A method for measuring the diameter of a rotating bobbin in a roving machine, characterized by measuring the rotation angle between a rotating flyer and a presser of the flyer, and determining the diameter of the bobbin around which roving is wound based on the amount of change in this rotation angle. .