JPH0321650B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention involves winding roving yarn twisted by a flyer at a constant rotation speed onto a bobbin that rotates at a higher speed than the flyer and forming it into a predetermined package. In a so-called bobbin-lead type roving frame, the winding speed of the bobbin is automatically controlled so that the roving tension is always approximately constant from the start of winding for package forming until the roving is full. This invention relates to a control device for taking speed.

BACKGROUND TECHNOLOGY In a conventional bobbin-lead type roving frame, when winding twisted roving yarn onto a bobbin in layers, the winding speed of the roving yarn is always adjusted to the spinning speed from a drafting device. In order to make the bobbin uniform, a transmission mechanism using a pair of cone drums is built into the drive system of the bobbin, and a belt wound between the pair of cone drums of the transmission mechanism is moved by a predetermined amount for each layer of the package. The number of revolutions of the bobbin is gradually decreased for each layer.

However, the winding speed of the roving for each layer of this package is not simply proportional to the number of roving layers, but depends on factors such as the type of fiber, fiber properties, roving count, number of twists, pressurizing force of the presser, etc. It changes slightly depending on the conditions. Therefore, with one type of cone drum pair designed based on certain specific spinning conditions, the winding speed of the roving for each layer of the package will always be the same as the spinning speed over a wide range of spinning conditions. It was practically difficult to make them the same. For this reason, it is possible to change the belt feed amount using an auxiliary cam that can be adjusted according to the spinning conditions, and the number of claw teeth of the drive source of the shifter that feeds the belt of the cone drum pair is larger than the predetermined number of teeth. The belt is set about one tooth less, and the belt is fed slightly more to make the roving yarn in the process of winding a little slack. When this slack accumulates, it is detected by photoelectric means and the control motor is energized for a short time. By applying this control input to the gear train from the gear meshing with the shifter's rack rod to the ratchet wheel, the belt feed is slightly returned to correct the bobbin rotation speed (Japanese Patent Publication No. 52-22532). The roving between the front roller and the flyer top of the machine is actively vibrated by applying an external force from a jet of air, and the natural frequency of the roving is measured with a frequency measuring device, and the natural frequency and setting are determined. If there is a deviation between the natural frequency and the set frequency, the bobbin rotation speed will be increased or decreased depending on the deviation value, and the bobbin will be full from the beginning of winding for package forming. A roving winding device for a roving frame (Japanese Patent Publication No. 1982-25525) has already been proposed, which winds the roving while keeping the roving tension constant throughout the roving.

Problems to be Solved by the Invention According to the above-mentioned conventional technology, it is necessary to perform many trial spinning to set the feed rate of the belt of the corn drum each time the spinning conditions change, which is not desirable in practice. It's not something. In addition, according to , each time the yarn layer of the package is changed, the belt is fed a large number of times and the roving is wound with a little slack, and when the slack accumulates and reaches a certain amount, the belt is returned and the roving tension is increased. The roving is wound with correction to the side. Therefore, when the roving is wound using this method, the roving tension is corrected to the tension side once every few layers, and the first correction value is relatively large. Because the tension changes rapidly, it is easy for shoulders to collapse at both ends of the package cage, and if the roving yarn count, which is related to the winding speed, changes beyond a certain level, the number of teeth on the ratchet wheel must be changed. Must be. Furthermore, an air jet device is installed to actively vibrate the braided yarn by intermittently blowing a jet of air onto the roving yarn between the front roller of the drafting device and the flyer top. In the sample weight, the pressure of the air flow that is intermittently blown acts on the roving between the front roller and the flyer top, especially in the case of lightly twisted roving made of synthetic fibers or blended with synthetic fibers. Incorrect drafts are more likely to occur, and at the same time, more fluff is generated. Furthermore, there is a drawback that a difference in roving tension occurs between the sample spindle and other spindles due to the blowing of the ejected air flow, making it impossible to make the winding conditions of the roving uniform over all the spindles. Furthermore, in this roving winding device, an external force is applied to the roving between the front roller and the flyer top to actively vibrate it, and the natural frequency of the roving when that external force is applied is calculated as the corresponding value of the roving tension. The natural frequency is compared with a preset set frequency, and the rotation speed of the bobbin is increased or decreased depending on the deviation between the natural frequency and the set frequency. There is. Therefore, in this device, the set value of the set frequency of the set value indicating device is an important point for keeping the roving tension at an appropriate constant value. Therefore, in order to set the set frequency of this set value indicating device to an appropriate value corresponding to a wide range of spinning conditions (fiber type, fiber specification, roving count, number of twists, etc.), it is necessary for each spinning Find the appropriate roving tension for each spinning condition by trial spinning, find the natural frequency when blowing airflow to the roving under the appropriate roving tension, and calculate the natural frequency as described above. It is necessary to set the setting value on the setting value indicating device. Therefore, even if a roving machine equipped with such a conventional roving winding device is equipped with a device that winds the roving yarn while keeping the roving tension constant, it is difficult to set the set frequency of the device. Furthermore, the above-mentioned operation, which is more troublesome than that of the conventional roving frame using the aforementioned auxiliary cam, has to be carried out every time the spinning conditions change, which is still not desirable from a practical standpoint.

Means for Solving the Problems The present invention provides that when the tension of the roving threads passing between the front roller and the flyer top becomes high, the average position (average center position) of the roving threads will be lower than the position of the proper tension state. This method was created by focusing on the relationship between roving tension and roving position, in which the roving moves upward, and when the tension is low, the average position moves below the position of the appropriate tension. The structure of the invention will be explained with reference to FIG. 1.A large number of photoelectrons are installed on the sides of the vertical vibration space of the roving yarn vibrating between the front roller and the flyer top to detect the vibration position of the roving yarn in the vertical direction. a roving position detection device comprising detectors arranged in sequence; means for calculating an average center position of vibrations in the vertical direction of the roving based on a position detection signal from the detection device; a correction signal generating means for calculating a correction amount of the bobbin rotation speed from a deviation value from a preset reference setting position of the roving and a correction coefficient, and generating a correction signal for making a correction of a magnitude corresponding to the correction amount; and a changing device for changing the rotation speed of the bobbin by an amount corresponding to the correction signal.

Operation According to the above configuration, the position of the roving thread passing between the front roller and the flyer top is detected by the roving position detection device disposed on the side of the vertical vibration space of the roving thread, and the detected roving thread position is The average center position of the roving is calculated based on the detection signal, and the bobbin rotation speed is changed by the bobbin rotation speed correction amount calculated from the deviation value between this average center position and a preset reference setting position and the correction coefficient. As a result, no matter how the roving vibrates, the roving tension can be controlled by calculating the average center position of the roving, which is closely related to the tension, and bringing this closer to the reference setting position. There are no adverse effects on the roving yarn or package cage due to shoulder collapse of the package cage that occurred in the equipment, incorrect drafting of the roving on the sample weight, increased fuzz, and differences in roving tension between the sample weight and other spindles. The roving standard setting position can be set to the appropriate position only once, and thereafter, even if the spinning conditions change, the average center position of the roving vibrations will be kept the same, so the roving standard setting position can be set to the appropriate position. There is no need to change the setting position, and the bobbin rotation speed from the start of winding for package forming until the full tube is automatically controlled to always match the spinning speed from the drafting device. The roving tension becomes approximately constant up to the point where the roving tension is approximately constant, making it possible to form a good package.

FIRST EMBODIMENT FIG. 2 shows a bobbin lead type roving frame showing a first embodiment of the present invention, in which a driving shaft 5 is driven from a main motor 1 via V pulleys 2, 3 and a V belt 4, and its driving Gear train 7 incorporating twist chain gear 6 from shaft 5
The front rollers 8 of the drafting device are driven via. A top shaft 12 for driving the flyer is driven from the driving shaft 5 via pulleys 9, 10 and a timing belt 11, and a gear 13 fixed to the top shaft 12 meshes with a gear 15 attached to an upper supported flyer 14. The flyer 14 is driven at constant speed rotation. On the other hand, the gear 16 fixed to the driving shaft 5 meshes with the external gear 18 of the differential gear mechanism 17, and the chain wheel 20 provided at the shaft end of the rotating plate 19 of the differential gear mechanism 17 and the intermediate chain wheel 21 are connected to each other. A chain 22 is wound, a chain 24 is wound between an intermediate chain wheel 21 and another chain wheel 23, and a gear 25 coaxial with this chain wheel 23 is wound.
meshes with the gear 27 of the bobbin shaft 26, and the gear 28 on the bobbin shaft 26 meshes with the bobbin wheel 29 that drives the bobbin 30, and if there is no rotational input from the input shaft 39, which will be described later, the bobbin 30 will be the same as the flyer 14. A constant speed drive mechanism is configured to drive the rotation speed. Further, a top cone drum 34 is fixed to the top cone drum shaft 33 to which the intermediate gears 31 and 32 of the gear train 7 are fixed, and a gap between the top cone drum 34 and a bottom cone drum 35 pivotally supported below the top cone drum 34 is fixed. A belt 36 is wound around the bottom cone drum 35.
The output shaft 37 of the differential gear mechanism 17 is connected to a gear 40 attached to the input shaft 39 of the differential gear mechanism 17 via a gear train 38, and a rack 42 is connected to a belt shifter 41 for moving the belt 36. , the rack 42 meshes with an external gear 45 on the output side of a differential gear mechanism 44 mounted on a hard shaft 43. The external gear 45 has a disk 45a integrally attached to its upper part.
The sun gear 44 passes through this external gear 45.
The shaft a protrudes downward and is integrally constructed with a bevel gear 71a, which will be described later, so that it can rotate relative to the external gear 45, and the hard shaft 43 passes through the center of the sun gear 44a, etc. , the sun gear 44a, etc., so that they can rotate relative to each other. The hard shaft 43 is further keyed to an internal gear 44b, and the internal gear 44b and the sun gear 44a are interlocked by a planetary gear 44c. In addition, this rigid shaft 43 is biased in the direction of the arrow A in the figure through a pulley 46, rope 47, and weight 48 fixed to its upper end, and the biased rigid shaft 43 is biased through a gear train 49 at its lower end. Rotation is regulated by the connected ratchet wheel 50 and pawls 51 and 52, and the pawls 51 and 52 alternately engage the ratchet wheel 50 at both ends of package molding in conjunction with a known molding device (not shown). By engaging and disengaging, the hard shaft 43 moves in the direction of the arrow A shown in the figure at both ends of the vertical movement of the bobbin rail (not shown) due to the biasing force of the plumb weight 48.
The rotation of the hard shaft 43 causes the rack 4 to rotate by a predetermined amount through the differential gear mechanism 44 and the external gear 45.
2, a belt shifter 41, and a belt 36 are intermittently sent to the left or right side in FIG. However, a normal bobbin transmission device 53 is configured so that the winding speed of the roving is the same as the spinning speed from the front roller 8. Therefore, the bobbin 30 installed between the flyer 14 and the bobbin wheel 29 is driven at a constant speed (same rotational speed as the flyer) by the constant speed drive mechanism extending from the gear 16 of the driving shaft 5 to the bobbin wheel 29. The increased speed driven by the bobbin transmission 53 to wind up the roving is combined by the differential gear mechanism 17, rotates at a higher speed than the flyer 14, and the front roller 8
The roving 55 spun from the roving and twisted by the flyer 14 in front of the roving is wound up in layers as the bobbin rail moves up and down to form a predetermined package. In addition, 54 is a known bobbin rail lifting device for raising and lowering the above-mentioned bobbin rail.

Next, 56 in FIGS. 2 and 3 indicates the front roller 8 and flyer top 14 of the drafting device.
The roving position detecting device 56 is installed between the front roller 8 and the flyer top 14a, and the roving position detecting device 56 detects vibrations of the roving 55 in the vertical direction (the third Arrow direction B)
, the projectors 57a... and the receivers 58a... are each addressed to one or two rows (Fig. 3 shows the case of 10 on one side) with different distances from the roving 55 to the optical axis. In addition, as is clear from FIG.
The photodetectors 57a and 58a are located in such a way that a large number of sets of photoelectric detectors (57a, 58a,
58a), the front roller 8 of the drafting device and the flyer top 1 are connected to the side of the vertical vibration space of the roving.
The vibration position in the vertical direction of the vibration generated in the roving thread 55 between the threads 4a is detected. The roving position detecting device 56 has a large number of photoelectric detectors, and the distance between the photoelectric detectors in the direction of arrow B in FIG. 3 is set as small as possible.
It is preferable to accurately detect the vibration position in the vertical direction. For this reason, the photoelectric detector may be, in addition to the above-mentioned light emitter/receiver, an image sensor or a photodetector using an optical fiber, which can reduce the distance between the light receivers. Also, photoelectric detectors (57a, 58) of this roving position detecting device 56
Since a) is for detecting the vibration position of the roving 55 in the vertical direction, it is sufficient that the distances from the roving 55 to the optical axis in the arrow direction B in FIG. 3 are at different positions. Therefore, the arrangement direction and installation position of the photoelectric detectors (57a, 58a) are not limited to the illustrated example. Further, the roving position detection device 56 does not need to be installed on all the spindles of the roving frame, and may be installed on one spindle or two to three spindles for one roving frame.

Next, 59 is a well-known microcomputer,
Mainly, as shown in Figure 4, the CPU60, ROM61,
Consists of RAM 62, input/output ports 63, 64, I/O interface 65, bus line 6
6. The input port 63 has the photoelectric detectors [57a, 58a] (these are
For example, from the top, the photodetector number n is n=
They are numbered 1, 2...10. ) from the I/O interface 65, that is, a signal indicating which phototube has been blocked.
In connection with the bobbin forming operation of the bobbin rail (not shown), photoelectric detectors (57a, 58
A limit switch 67 arranged to output a tension detection signal to start the detection of a) and a limit switch 68 arranged to output a correction command signal to start correction are connected, and signals from these are connected to the input port 63. is input to.

Next, the correction device 69 will be explained. 70 is a control motor, 71 is a bevel gear wedged on the output shaft of the control motor, and 71a is the bobbin transmission 53.
The bevel gear is loosely fitted onto the hard shaft 43 of the differential gear mechanism 44 and meshes with the bevel gear 71, and rotates integrally with the sun gear 44a, so that the rotation of the control motor 70 is transmitted to the sun gear 44a. It's getting old. 7
Reference numeral 2 denotes a known motor controller connected to the I/O interface 65, which turns the control motor 70 on and off, as well as in forward and reverse directions, based on the calculation result (correction value) in the microcomputer 59. It's summery. An encoder 73 detects the rotation of the control motor 70, generates a pulse signal according to the amount of rotation, counts this pulse signal up to a correction value in a microcomputer, and turns off the motor controller 70. It's summery.

In the first embodiment configured as above, the operation of the normal bobbin transmission 53 will be explained first. When the roving machine starts operating, the fiber bundle spun from the front roller 8 of the drafting device is twisted by the flyer 14 rotating at a constant speed to become the roving yarn 55. The bobbin 30 rotates at high speed and moves up and down as a bobbin rail (not shown) moves up and down, and the bobbin 30 winds it up in layers and forms it into a predetermined package. During this package forming from the start of winding to the full tube, each time the bobbin rail (not shown) reaches its rising and falling ends, a claw 51 that operates in conjunction with a known forming device (not shown) , 52, the ratchet wheel 50 of the bobbin transmission 53 rotates by a predetermined amount in the direction of arrow A due to the biasing force of the weight 48, and the rotation of the ratchet wheel 50 causes the gear train 49, the hard shaft 43, and the differential The external gear 45 moves in the direction of the arrow A via the dynamic gear mechanism 44.
The rotation of the external gear 45 moves the belt 36 wound between the upper and lower cone drums 34 and 35 via the rack 42 and the belt shifter 41 by a predetermined amount from the left side to the right side in FIG. , this belt 3
6, the rotation speed of the bobbin 30 is reduced by a predetermined amount for each layer of the package.

Next, the operation of the correction device 69 will be explained with reference to the flowchart shown in FIG. The program starts as soon as the power to the machine is turned on, and in step P1, a tension detection signal is input from the limit switch 47 installed in connection with the molding operation.
At step P2, the photoelectric detector number n is set for a certain period of time.
The shading degree (or shading time) Sn (n= 1, 2, 3...). The tension of the roving thread between the front roller and the flyer top has become low.
It does not mean that the amplitude becomes large and large ballooning occurs; for example, it does not vibrate with a very large amplitude even when it is in a relaxed state with low tension, and it does not vibrate at all under this tension state, or when it is under proper tension. When the roving machine spins, it often happens that there is almost no vibration in this state, or that the roving is ballooned due to the rotation of the flyer top and the roving is positioned above the straight line connecting the flyer top and the front roller. It is well known among those skilled in the art that the behavior of the roving is extremely unstable, but since the photoelectric detectors are arranged side by side in order in the vertical vibration space of the roving,
Even if such roving yarn vibration occurs, the roving yarn position can be captured as data. Next, in step P3, the formula _K 〓 ⁿ⁼¹ (n・Sn)/ _K 〓 ⁿ⁼¹ Sn (K is the photoelectric detector (K=10 in this example)
The average center position of the vibrations in the vertical direction is calculated as an expression of the tension state of the roving. The average center position is preset in step P4, and the ROM
The deviation value (Xo
-) and the correction coefficient C, a correction value l corresponding to the correction amount of the bobbin rotation speed is calculated using the following equation l=C(Xo-). The correction coefficient C is a so-called sensitivity, and is set in advance so that the average center position quickly approaches the reference setting position Xo. Then, when a correction command signal is input in step P5, a correction signal based on the correction value l is outputted in step P6. The output correction signal is transmitted to the motor controller 72,
The motor controller 72 rotates the control motor 70 in forward and reverse directions based on this correction signal. This control motor 70
The encoder 73 converts the amount of rotation into a pulse signal, and when the control motor 70 rotates by an amount corresponding to the correction value l, a control motor stop signal is output. When the control motor 70 rotates in this manner, the external gear 45 of the bobbin transmission 53 is rotated by the bevel gears 71, 71.
a and the differential gear mechanism 44, and the belt 36 rotates between the rack 42 and the belt shifter 41.
The roving thread is moved to the right or left side in FIG. Ru. Therefore, by repeating this correction of the bobbin rotational speed, the roving tension from the beginning of winding for package forming to the full tube is always kept at an appropriate constant value.

Second Embodiment As shown in FIG. 6, in this embodiment, the drive source of the bobbin transmission 53A is a control motor 70A which is also driven by a correction signal, and the rack 42 of the belt 36 feeding mechanism is connected to the control motor 70A. An external gear 45A wedged on the output shaft of the 70A is meshed with the output shaft of the 70A, which performs fixed deceleration of the bobbin rotation speed for each layer of the package and correction of the bobbin rotation speed according to fluctuations in roving tension.
This is done by a common control motor 70A. In addition, a limit switch (not shown) is installed to detect the rising end and descending end of the bobbin rail, and this detection signal is sent to the I/O interface 65.
A reference speed change value setting device is connected to the input port 63 for setting a reference speed change value Lo at which the rotational speed of the bobbin is reduced for each layer of the package.

The operation of this configuration will be explained with reference to the flowchart shown in FIG. Similarly to the first embodiment, if there is no tension detection signal at step A3 and the bobbin rail is at the ascending end or descending end at step A1 during the period from the start of winding to the full tube during package forming, the process proceeds to step A2. A reference speed change signal corresponding to the reference speed change value Lo set in advance is transmitted to the motor controller 72, and the motor controller 72 drives the control motor 70 based on this signal, and by this rotation, the external gear 45A, the rack 42 , the upper and lower cone drums 34, 35 via the belt shifter 41.
The belt 36 wound therebetween moves by a predetermined amount from the left side to the right side in FIG. 6, and as the belt 36 moves, the rotational speed of the bobbin 14 is reduced by a predetermined amount for each layer of the package. If the bobbin rail is not in the up/down position in step A1, and the tension detection signal is input in step A3 as in the first embodiment, then step A4 is performed as in the first embodiment.
In ~A8, data is read from the roving position detection device, the average center position of vertical vibration of the roving is calculated, and a correction value l is calculated and output. The control motor 70A is driven by this correction signal, and the belt 36 is moved between the rack 42 and the belt shifter 41.
The rotational speed of the bobbin is decelerated or increased by a correction amount corresponding to the correction value l, and the roving tension from the front roller 8 to the bobbin 14 is corrected.

Moreover, according to such a configuration, control is also performed by the flowchart shown in FIG. According to this flowchart, after calculating the average center position and correction value l in steps B1 to B4, step B
5, the shift value L (the sum of the reference shift value Lo and the correction value l) is calculated, and then, in step B6, when the bobbin rail reaches the vertical switching position, the shift value L is calculated.
A shift signal corresponding to
6 to perform the standard shift and correction at the same time.

In each of the above embodiments, a transmission mechanism using a cone drum has been described, but the present invention is not limited to this, and other known transmission mechanisms such as a chain type transmission mechanism may be used. Furthermore, in the second embodiment, the belt shifter 41 was moved by easy feeding, but the present invention is not limited to this. The member may be coupled to a belt shifter and moved by a screw feed. In this case, instead of the control motor, a control drive source consisting of a ratchet wheel, a ratchet pawl, and a solenoid for operating the ratchet pawl may be used, and the ratchet wheel may be fixed to the lead screw rod. Furthermore, the belt shifter can also be moved using a pressure cylinder equipped with a position detection sensor.

Effects of the Invention As described above, the present invention sequentially arranges a large number of photoelectric detectors to detect the vertical vibration position of the roving on the sides of the vertical vibration space of the roving extending between the front roller and the flyer top. , calculate the average center position of the vibration in the vertical direction of the roving based on the position detection signal output from each of those photoelectric detectors,
The bobbin rotation speed is corrected so that the average center position approaches the preset reference setting position, so if the roving vibrates irregularly, etc. However, it is possible to collect enough roving position data by applying an external force to the roving, and to accurately calculate the average center position of the vertical vibration of the roving, which is closely related to the roving tension. can be understood correctly. the result,
It is possible to accurately bring the average center position (roving tension) close to the predetermined reference setting position (appropriate tension), preventing uneven tension and fuzzing of the roving between the front roller and flyer top, and improving the roving. The thickness and surface uniformity can be significantly improved. In addition, the average center position of the vibrations, which is unrelated to the spinning conditions such as the roving yarn count, is calculated, and the correction amount is calculated from the deviation value between this average center position and the preset reference setting position of the roving yarn, and the correction coefficient. However, the bobbin rotation speed is corrected using the correction amount so that the average center position approaches the reference setting position, so when installing the photoelectric detector, the roving reference setting position can be set only once. Thereafter, even if the spinning conditions change, there is no need to change the reference setting position, and preparatory work at the time of changeover can be eliminated, and operability can be significantly improved. Furthermore, since the number of revolutions of the bobbin is corrected in accordance with the correction amount calculated above, it is possible to immediately correct changes in the tension of the roving between the front roller and the flyer top and quickly return it to the predetermined tension. This is a practical invention that can maintain an appropriate tension at all times, and as a result, can keep the tension of the roving substantially constant from the beginning of winding to the end of winding.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the configuration of the invention, FIG. 2 is an overall view showing the first embodiment, FIG. 3 is a side view of the roving position detection device, FIG. 4 is a configuration diagram of electronic components, and FIG. 5 is a flowchart, FIG. 6 is a diagram showing the main part of the second embodiment, and FIGS. 7 and 8 are flowcharts of FIG. 6. 8...Front roller, 14...Flyer, 1
4a... flyer top, 55... roving, 56...
...Roving position detection device, 59...Microcomputer, 70, 70A...Control motor, 72...Motor controller.

Claims (1)

[Claims] 1. In a bobbin reed type roving frame, (a) the vibration position in the vertical direction of the roving yarn is detected on the side of the vertical vibration space of the roving yarn vibrating between the front roller and the flyer top; (b) a roving position detection device comprising a number of photoelectric detectors arranged in sequence; (c) calculating a correction amount for the bobbin rotation speed from the deviation value between this average center position and a preset reference setting position of the roving and a correction coefficient; Control of roving winding speed in a roving machine, comprising: a correction signal generating means for generating a correction signal for making a correction of a corresponding magnitude; and (d) a changing device for changing the rotation of the bobbin by an amount corresponding to the correction signal. Device. 2. The changing device is a normal bobbin transmission device that gradually reduces the rotation speed of the bobbin by a predetermined amount for each layer of package molding, and a correction device that corrects the rotation of the bobbin via a control motor driven by the correction signal. A roving winding speed control device in a roving frame according to claim 1, characterized in that it is constructed by: 3. The roving winding speed control device in a roving frame according to claim 1, wherein the changing device is constituted by a bobbin transmission device using a control motor as a drive source. 4 The means for calculating the average center position consists of a memory in which the degree of shading based on the position detection signal from the photoelectric detector is written in correspondence with the number of a large number of photoelectric detectors, and a roving from the degree of shading and the photoelectric detector number. 2. A control device for a roving winding speed in a roving frame according to claim 1, further comprising an average center position calculating means for calculating an average center position of the roving machine.