JPH04361625A - Method for controlling winding of roving in roving frame - Google Patents

Abstract

PURPOSE:To improve roving quality by utilizing data on the bobbin rotational speed in a proper tension state obtained in the previous winding and operating for the next winding and operating in performing the repeated winding and operating under the same spinning conditions. CONSTITUTION:A speed change pattern of bobbin rotational speed according to an increase in a wound roving layer is preset and the bobbin rotational speed is changed based on the aforementioned speed change pattern for the increase in the wound roving layer. The roving tension in winding the same layer is simultaneously regulated on a sensed signal of a roving tension sensor. The speed change pattern in winding and operating at the (N+1)-th time is set so that the average bobbin rotational speed in a proper tension state in the i-th layer in winding and operating at the N-th time may be the bobbin rotational speed in the i-th layer in the winding and operating at the (N+1)-th time.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention automatically controls the rotational speed of the bobbin in a so-called bobbin lead type roving frame so that the roving tension is always approximately constant from the start of winding until the roving is full. The present invention relates to a roving winding control method in a roving frame.

0002

[Prior Art] A device for controlling the roving winding speed, that is, the bobbin rotation speed, so that the roving tension is always kept almost constant from the start of roving winding to the full length of the roving. A normal bobbin transmission device that gradually decreases the number of roving layers by a predetermined amount each time the number of roving layers increases, a roving position detection device that detects the roving position between the front roller and the flyer top, and the detected roving position. For example, a change device that calculates a correction amount of the bobbin rotation speed by comparing the reference position in a preset appropriate tension state and changes the bobbin rotation speed by an amount corresponding to the correction amount is, for example, Tokukai 1986
This method is proposed in Japanese Patent No.-34628.

[0003] When performing roving winding operation with this type of device, a bobbin rotational speed change pattern is set in advance as the number of wound roving layers increases in accordance with the spinning conditions, as shown by the thick line in FIG. Ru. If the spinning conditions are the same, the speed change pattern will be set the same no matter how many times doffing is repeated. If the roving sent out from the draft part is homogeneous and the winding conditions are strictly constant, the winding tension will also be constant if the bobbin rotation speed is constant when winding the same roving diameter, that is, the same roving layer. . However, due to causes such as the raw material sliver not being completely uniform and fluctuations in temperature and humidity during spinning, the roving tension deviates from the appropriate value even if the bobbin rotation speed is maintained at a value corresponding to the speed change pattern. A condition arises. In order to correct this deviation, in actual operation, as shown by the thin line in Figure 3,
The bobbin rotation speed changing device is operated many times until the bobbin rotation speed converges to a value that provides the appropriate tension.

0004

[Problem to be Solved by the Invention] In the conventional apparatus, if the spinning conditions are the same, in the winding operation after doffing, the same speed change pattern is again used to increase the number of bobbin revolutions as the number of roving layers increases. After the change is first made, the bobbin rotation speed is controlled so that the roving position at that bobbin rotation speed becomes a reference position in a preset appropriate tension state. Therefore, as shown in FIG. 3(b), during the second winding operation, the bobbin rotation speed converges to the appropriate tension as in the first winding operation shown in FIG. 3(a). It is necessary to operate the bobbin rotation speed changing device many times until the winding operation reaches the appropriate tension state, and the time required to reach the appropriate tension state is the same as during the first winding operation. Therefore, if it takes a long time to reach the appropriate tension state during the first winding operation, it will take a similar time from the next time as well.
The time spent in the incorrect state increases, which is unfavorable for the quality of the roving.

[0005] The present invention has been made in view of the above-mentioned problems, and its purpose is to maintain the proper tension state obtained during the previous winding operation when repeated winding operations are performed under the same spinning conditions. Utilizing the bobbin rotation speed data during the next winding operation, the bobbin rotation speed can be brought to the appropriate state in a short time after changing the bobbin rotation speed due to an increase in the number of roving layers to be wound, improving roving quality. An object of the present invention is to provide a method for controlling roving winding in a roving frame.

[0006]

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a bobbin rotational speed change pattern is set in advance as the number of wound roving layers increases, and each time the number of wound roving layers increases. In a roving machine that changes the bobbin rotation speed based on a speed change pattern and adjusts the roving tension when winding the same layer by controlling the bobbin rotation speed based on a detection signal from a roving tension detection device, The bobbin rotation speed at the time when the tension is corrected to an appropriate winding state is calculated by the calculation means, and the data is stored in the storage means for each roving layer, and the number of wound roving layers is increased based on the data. A new bobbin rotation speed change pattern is set, and during the next winding operation, the bobbin rotation speed is controlled based on the newly set speed change pattern.

[0007]

[Function] In the present invention, the bobbin rotation speed is changed based on a preset bobbin rotation speed change pattern each time the number of roving layers to be wound increases, and the roving tension is adjusted when winding the same layer. This is done by controlling the bobbin rotation speed so that the roving tension is in an appropriate state based on the detection signal of the tension detection device. The bobbin rotational speed at the time when the tension has been corrected to an appropriate winding state is calculated by the calculation means, and the data is stored in the storage means for each roving layer. Then, based on the data, a new bobbin rotation speed change pattern is set as the number of wound roving layers increases, and during the next winding operation, the bobbin rotation speed is controlled based on the newly set speed change pattern. will be held. The newly set speed change pattern is based on the bobbin rotation speed at the appropriate tension state for each layer during the previous winding operation, so as the number of winding roving layers increases, the bobbin rotation speed changes according to the speed change pattern. After being changed to the value corresponding to the roving layer, the bobbin rotation speed will reach the appropriate state in a short time.

[0008]

[Embodiment] An embodiment embodying the present invention will be described below with reference to FIGS. 1 and 2. The drive system of the roving frame is basically the same as the one previously proposed by the applicant of the present application (Japanese Patent Application Laid-Open No. 63-264923), but the mechanism for switching the vertical movement of the bobbin rail is different. The front roller 1 is rotatably driven through a gear train disposed between one end of its rotating shaft 1a and a driving shaft rotatably driven by a main motor M. A driven gear 3 is fitted and fixed to the upper part of the flyer 2 so as to be integrally rotatable, and the rotation of the driving shaft is rotated via a driving gear 5 fitted to a rotating shaft 4 which is transmitted via a belt transmission mechanism. It has become so. On the other hand, a rotating shaft 9 to which a driving gear 8 that meshes with a driven gear 7a of a spindle 7 mounted on a bobbin rail 6 is fitted and fixed is driven by the rotational force of the driving shaft and at variable speeds via an inverter 10. The rotational force generated by the variable speed motor 11 is combined and transmitted by the differential gear mechanism 12.

A rotary shaft 15 fitted with a gear 14 that meshes with a lifter rack 13 fixed to the bobbin rail 6 has a drive driven by another variable speed motor 16 that is variable speed driven via the inverter 10. Rotation of shaft 17 is transmitted via switching mechanism 18 and gear train. Switching mechanism 18
is an intermediate shaft 19, a pair of gear trains 20 and 21 provided between the intermediate shaft 19 and the drive shaft 17, and a gear train 20,
an electromagnetic clutch 22 that transmits the rotation of 21 to the intermediate shaft 19;
23, and the direction of rotation of the rotating shaft 15, that is, the direction of the vertical movement of the bobbin rail 6, is changed by excitation and demagnetization of the electromagnetic clutches 22 and 23. Rotating axis 1
A rotary encoder 24 is provided at the end of the bobbin rail 6 as a position detection means for detecting the vertical position of the bobbin rail 6.
is connected. Further, a rotational speed detector 26 is disposed near the gear 25 that rotates integrally with the front roller 1. Also, front roller 1 and flyer top 2
A non-contact tension detecting device (roving position detecting device) 27 for detecting the tension state of the roving R is disposed between the roving a and the roving R. As the tension detection device 27, a known tension detection device is used.

The control device 28 includes a central processing unit (hereinafter referred to as CPU) 29 as an arithmetic means, a program memory 30 consisting of a read-only memory (ROM) that stores a control program, and input data and information inputted by an input device 31. It consists of a working memory 32 as a storage means consisting of a readable and rewritable memory (RAM) for temporarily storing calculation processing results etc. in the CPU 29.
operates based on program data stored in program memory 30. Type of fiber, gel, number of twists, bobbin diameter at the start of winding, predetermined winding amount until full (
Input device 31 for inputting spinning conditions such as full pipe length) and shoulder angle
is integrated into the control device 28 as a keyboard. The detection signal from the rotational speed detector 26 is sent to the CPU 2.
9, and the detection signal from the tension detection device 27 is input to A/
The signal is input to the CPU 29 via the D converter 33. Furthermore, the excitation and demagnetization of the electromagnetic clutches 22 and 23 are controlled based on signals from the CPU 29, so that the bobbin rail 6 is switched up and down. Also, C
PU29 is output interface 34, motor drive circuit 3
5 and an inverter 10 to drive and control a variable speed motor 11.

Next, the operation of the apparatus constructed as described above will be explained. Before operating the machine, first, input device 31 inputs spinning conditions such as fiber type, gel, number of twists, bobbin diameter at the start of winding, predetermined winding amount until full pipe (full pipe length), and shoulder angle. Set by. Also, a bobbin rotational speed change pattern is set in accordance with the spinning conditions as the number of wound roving layers increases. The setting of the speed change pattern may be selected from among a large number of bobbin rotational speed change patterns stored in the program memory 30. After setting the spinning conditions and speed change pattern, the machine starts operating, and the main motor M rotates the front roller 1 and the flyer 2, respectively. As the machine is driven, output signals from the rotary encoder 24, rotation speed detector 26, and tension detection device 27 are input to the CPU 29. Further, the variable speed motor 11 is also driven at the same time as the machine is started, and the rotational force of the main motor M input to the differential gear mechanism 12 and the rotational force of the variable speed motor 11 are combined by the differential gear mechanism 12. , the rotating shaft 9 is driven by the combined rotational force, and the spindle 7 is rotationally driven. As a result, the rovings R drawn by the draft device are twisted by the flyer 2 and wound in layers around the bobbin B, which rotates at a higher speed than the flyer 2. Further, the bobbin rail 6 is moved up and down together with the lifter rack 13 via the switching mechanism 18, the rotating shaft 15, and the like. The winding speed and the raising and lowering speed of the bobbin rail 6 are changed by changing the rotational speeds of the variable speed motors 11 and 16.

The CPU 29 inputs the output signal from the rotary encoder 24 and calculates the position of the bobbin rail 6.
The bobbin rail 6 is controlled to move up and down within a predetermined range by outputting an excitation/demagnetization switching signal to the electromagnetic clutches 22 and 23 so as to obtain a roving shape (roving shoulder angle) corresponding to the spinning conditions. The output signal from the rotational speed detector 26 is input to calculate the spinning amount. In addition, the CPU 29 has one winding roving layer.
As each layer increases, the variable speed motor 11 is driven and controlled via the inverter 10 so that the bobbin rotation speed becomes the rotation speed of the relevant roving layer of the speed change pattern set by the input device 31, and the lifter rack 13, ie, In order to reduce the moving speed of the bobbin rail 6 in synchronization with the winding speed, a variable speed motor 16 is driven and controlled via an inverter 10.

[0013] the raw material sliver is not completely uniform;
Due to factors such as temperature and humidity fluctuations during spinning, even if the bobbin rotation speed is set to a value corresponding to the speed change pattern each time the number of wound roving layers increases by one layer, the value may not always be suitable for the appropriate roving. The roving tension is not necessarily in a tensioned state, and the roving tension deviates from the appropriate state. The CPU 29 inputs the output signal from the tension detection device 27, determines whether the roving tension is in an appropriate state based on the signal, and if it deviates from the appropriate tension, moves the bobbin in the direction of the appropriate tension. The variable speed motor 11 is drive-controlled so that the rotation speed is changed. The variable speed motor 11 is drive-controlled to decrease the bobbin rotation speed when the roving tension is larger than the appropriate value, and to increase the bobbin rotation speed when it is smaller.

Therefore, after the bobbin rotation speed is changed to a value corresponding to the preset speed change pattern shown by the thick line in FIG. The bobbin rotation speed is corrected as shown by the thin line in FIG. 1(a) until the bobbin rotation speed reaches the same speed. The number of corrections from the bobbin rotation speed according to the preset speed change pattern to the bobbin rotation speed corresponding to the appropriate tension state is random. In addition, the appropriate tension state (Fig. 1
The number of bobbin rotation speeds at which the rotational speed becomes F in (a) is not limited to just one, but may be multiple (for example, in the case of the 6th layer in Fig. 1(a)), and the winding of the relevant layer is completed. In some cases, the appropriate tension may not be achieved until the tension is reached. Based on the output signal from the tension detection device 27, the CPU 29 calculates the average bobbin rotation speed at the time when the tension is corrected to an appropriate state for each wound roving layer, and stores the data in the working memory 32. In addition, if the appropriate tension state is not achieved until the winding of the relevant layer is completed, the final rotational speed of the relevant layer is stored in the working memory 32 as data for the appropriate tension state.

When the second winding operation is performed under the same spinning conditions after the full tube is stopped and the doffing is completed, the CPU 29 stores information for each winding roving layer stored in the working memory 32 during the previous winding operation. Based on the average bobbin rotational speed data in the appropriate tension state, a new bobbin rotational speed change pattern for increasing the number of wound roving layers is set and stored in the working memory 32. During the second winding operation, the CPU 29 drives and controls the variable speed motor 11 to change the bobbin rotation speed according to the newly set speed change pattern every time the number of roving layers to be wound increases by one layer. . In other words, during the second winding operation, the bobbin rotation speed is changed every time the number of wound roving layers increases by one layer, depending on the appropriate tension state of each wound roving layer during the previous winding operation under the same spinning conditions. Therefore, after the bobbin rotation speed is changed to a value corresponding to the speed change pattern as shown in FIG. The number of times the bobbin rotational speed is corrected until it reaches the rotational speed is reduced compared to the first winding operation. CP even during the second winding operation.
U29 calculates the average bobbin rotational speed at the time when the tension is corrected to an appropriate state for each wound roving layer, and stores the data in the working memory 32.

[0016] Similarly, during the (N+1)th winding operation (N is a natural number), the average bobbin rotation speed at the appropriate tension state of each winding roving layer during the Nth winding operation is used as basic data. Based on the set speed change pattern, the bobbin rotation speed is changed as the number of wound roving layers increases. Therefore, as the winding operation is repeated, the bobbin rotational speed is changed according to the speed change pattern, and then the bobbin rotational speed at the appropriate tension state is reached in a short time, and the bobbin rotational speed is adjusted until the bobbin rotational speed at the appropriate tension state is reached. The frequency also decreases. Therefore, the winding time in an incorrect tension state is shortened, and fluctuations in the tension of the roving are suppressed, and the quality of the roving is improved.

Furthermore, the shoulder angle of the roving winding, that is, the angle formed between the surface of the truncated conical portion at both ends of the roving winding and the axis of the bobbin B, depends on the timing of raising and lowering the bobbin rail 6 and each It is determined by the thickness of the roving layer, and the thickness of the roving layer is influenced by the pressure applied by the presser and the roving tension during winding. Then, when the roving is wound at a bobbin rotational speed according to a preset speed change pattern, the set shoulder angle is obtained. Therefore, when the bobbin rotation speed is changed after the bobbin rotation speed is changed due to an increase in the number of wound roving layers, the larger the difference, the more the shoulder angle deviates from the desired angle. However, as described above, from the second winding operation, the deviation from the set value of the speed change pattern becomes smaller, so that a roving winding closer to the desired shoulder angle is formed.

Note that the present invention is not limited to the above-mentioned embodiments. For example, when setting a new speed change pattern for the (N+1)th winding operation, each winding pattern for the Nth winding operation is Instead of using the average bobbin rotation speed at the appropriate tension state of the roving layer as the basic data, if there are two or more bobbin rotation speeds at the same wound roving layer at the appropriate tension state, use their average value. Instead, the bobbin rotation speed at the latest appropriate tension state may be used as the basic data, or the bobbin rotation speed at the appropriate tension state when the spinning time is longest may be used as the basic data. In addition, tension detection device 2
Regardless of the output signal of step 7, the final rotational speed of the i-th layer during the Nth winding operation is used as data for the appropriate tension state, and the speed change pattern of the i-th layer during the (N+1)th winding operation is It may also be the bobbin rotation speed. Furthermore, instead of using the pair of electromagnetic clutches 22 and 23 as the switching mechanism 18 for controlling the switching of the bobbin rail 6 up and down, a variable speed motor capable of forward and reverse rotation may be used as the variable speed motor 16. Furthermore, a drive system using a cone drum may be adopted as the variable speed drive means for the spindle 7.

[0019]

Effects of the Invention As described in detail above, according to the present invention, when winding operations are repeatedly performed under the same spinning conditions, the bobbin rotational speed data at the appropriate tension state obtained during the previous winding operation can be used for the next time. During winding operation, after changing the bobbin rotation speed due to an increase in the number of roving layers to be wound, the bobbin rotation speed reaches a value corresponding to the appropriate tension state in a short time, and the frequency of tension correction decreases. Since the tension fluctuation is suppressed, the quality of the roving can be improved. Moreover, it is possible to form a roving winding in which the shoulder angle of the roving winding is closer to a desired value.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a set speed change pattern and a corrected speed change pattern of the bobbin rotation speed during roving winding when the present invention is implemented.

FIG. 2 is a schematic diagram of a roving frame implementing the present invention.

FIG. 3 is a diagram showing a set speed change pattern of the bobbin rotation speed during conventional roving winding and a speed change pattern after correction.

[Explanation of symbols]

2...flyer, 7...spindle, 11...variable speed motor,
27... Tension detection device, 28... Control device, 29... CPU as calculation means, 32... Working memory as storage means, R... Roving.

Claims (1)

[Claims] 1. A bobbin rotational speed change pattern is set in advance as the number of wound roving layers increases, and the bobbin rotational speed is changed based on the speed change pattern each time the number of wound roving layers increases. In a roving machine that adjusts the roving tension during winding by controlling the bobbin rotation speed based on a detection signal from a roving tension detection device, the bobbin rotation speed at the time when the tension has been corrected to an appropriate winding state is measured. The calculation means performs calculations, and the data is stored in the storage means for each roving layer, and based on the data, a new bobbin rotational speed change pattern is set as the number of roving layers to be wound increases, and the next winding is performed. A roving winding control method in a roving frame, which performs speed change control of the rotational speed of a bobbin during operation based on the newly set speed change pattern.