JPS6018337B2 - Method and apparatus for eliminating single lap weight fluctuations and longitudinal weight fluctuations - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for eliminating single wrap and longitudinal weight variations.

There are weight variations in the slivers or wraps used in spinning mills. This weight fluctuation can be broadly divided into long-period weight fluctuation and short-period weight fluctuation. If we look at this with a wrap former machine, for example a sliver wrap machine or a ribbon machine which is a comb preparation machine in a cotton comber, the length of each wrap is set to a constant length by a counter, so the long cycle The weight fluctuation appears as a fluctuation in the weight of a single wrap formed by the wrap former machine, while the short-period weight fluctuation appears as a weight fluctuation in the longitudinal direction of the wrap. Fluctuations in the weight of each wrap are caused by long-term fluctuations in the weight of the raw material supplied to the wrap former machine.

Particularly in modern spinning mills where the cross-line process and streamline process are continuous, there is a mirror direction in which the slivers of all the cotton machines connected to one series of cross-line devices become heavier or lighter all at once. Therefore, the wrap of the wrap former machine made using this sliver also tends to last for a while (if the weight of the sliver becomes heavier, it will remain heavy), or if it becomes lighter, it will remain lighter for a while. If such long-period weight fluctuations are left unchecked, they will eventually lead to fluctuations in yarn count, so they must be removed. However, this weight fluctuation has a long period and occurs for all lots connected to one series of crosstalk devices, so it cannot be eliminated by doubling. Another option is to take a sample from the streamline machine or preparation machine, measure it, and then correct it by replacing gears on the streamline machine or preparation machine, but this method requires a large amount of work and In practice, this method cannot collect samples due to the inability to obtain appropriate measurement timing. Therefore, the current situation is that we have no choice but to leave such long-period weights as they are. On the other hand, the weight fluctuation in the longitudinal direction of the wrap is a phenomenon caused by irregular drafts that occur when the wrap, which has a low binding force between fibers, is placed on a pair of crease rollers and wound up.

In other words, when the diameter of the wrap is small, the wrap undergoes irregular drafting due to the influence of the crease roller, resulting in a thinner wrap.On the other hand, as the diameter of the wrap increases, the influence of the crease roller becomes weaker and irregular draft occurs. <
), and as a result, the wrap does not become thinner. The timing at which the thickness of the wrap changes due to this irregular draft differs from one wrap former machine to another even when the same raw material is lap formed under the same conditions. It is. If a wrap with weight fluctuation in the longitudinal direction is processed by a combing machine as described above, the weight fluctuation of the lap supplied to the sliver of the combing machine will naturally occur, and this will cause problems in the combing process and subsequent processes. Even if some compensation is provided by the doubling operation, the fluctuation in the weight of the wrap ultimately has the disadvantage of reducing the uniformity of the yarn. Therefore, the subordinate had to randomly use the wraps in the combing process to compensate for variations in the longitudinal weight of the wraps. It is an object of the present invention to eliminate the above-mentioned drawbacks of the subordinate wrap former machines, and to form wraps in which single wrap weight fluctuations and longitudinal weight fluctuations are eliminated using respective wrap former machines.

The purpose of the present invention is to weigh the weight of one wrap formed by a wrap former machine, compare the weighed value with the standard weight of one wrap, detect the difference, and set the wrapper based on the difference. The adjustment reference draft was set by adjusting the standard draft ratio of the drafting means of the lap former machine, and also the characteristics of the lap forming mechanism in the lap former machine and the longitudinal direction of the wrap that occurs due to changes in the outer diameter of the wrap during wrap winding. The head value of the weight fluctuation is measured, and a draft ratio set to cancel the trend value is sequentially added to the adjusted draft ratio of the drafting means of the wrap former machine as the wrap formation progresses, and the wrap former machine This is achieved by eliminating the longitudinal weight fluctuations of the wraps that occur in the above-mentioned process along with the fluctuations in the weight of each wrap due to the setting of the adjustment reference draft ratio.

The method of the present invention will be explained below using figures to compare it with adjusting the weight of the wrap in a conventional wrap former machine.

That is, FIG. 1 is a diagram for explaining the method of eliminating single-wrap weight fluctuations and longitudinal weight fluctuations of the present invention. The three stages of regulating changes in are shown in juxtaposition. The horizontal axis direction indicates from the beginning to the end of one wrap for each stage. In Figure 1, SD
The stage indicated by indicates the standard draft ratio of the draft part in the lap former machine. This reference draft ratio is determined in a known manner by the difference in weight per unit length of the supplied sliver or wrap and the processed wrap. If a wrap of the desired weight cannot be obtained, work such as gear replacement is performed to change the standard draft ratio. That is, in FIG. 1, if the desired wrap weight per unit cannot be obtained by weaving with the standard draft ratio al, the standard draft ratio is manually changed to a2 or a3.
This work is the same method used in traditional spinning factories.
This is done relatively often due to differences in draft effects due to the influence of overflowing humidity within the factory. Note that when the target weight of a single wrap changes, it is necessary to significantly change the standard draft ratio as shown by a10 in FIG. In the method of the present invention, the method of eliminating the weight fluctuation of one wrap, which will be described later, is to change the standard draft ratio al in FIG. 1 to a2 or a3.
It automates the work of manually changing the However, it is not possible to make a small change up to al0 in one part of the draft part as will be described later because there is a risk of degrading the quality of the wrap, but instead it is done by replacing gears as before. In FIG. 1, the steps indicated by A indicate the steps for eliminating single-wrap weight variations, and the steps indicated by B indicate the steps for eliminating longitudinal weight variations of the wraps.

First, in step B, curves aIW1, aIW2 . aIW3
and aIW4 are shown. This curve is a model showing the weight fluctuation per unit length in the longitudinal direction of one wrap. As mentioned above, this is the longitudinal weight variation of the wrap that occurs as the wrap is wound, and this curve differs depending on the individual wrap former machines, that is, depending on the habits of the machine. This curve has various forms as shown in Fig. 1, but it usually has a shape similar to the curve aIWI, and the deviation value from the center line indicated by the dashed line is changed over the longitudinal direction of the wrap using a wrap former machine. Make it. The method of removing the longitudinal weight fluctuation of the wrap in the present invention is to obtain by measurement a mirror value of the longitudinal weight fluctuation of the wrap, for example, a curve indicated by aIWI, and cancel this deflection value to indicate a dot-dashed line. The draft ratio of the draft part of the wrap former machine is automatically changed in accordance with the formation of the wrap so that the weight per unit length corresponding to the indicated center line can be obtained. As a result, it is possible to obtain a wrap with a uniform weight per unit length over the entire area from the beginning to the end of the wrap. Next, in stage C, the curve aIW1bl,
aIW1b2 and aIW1b3 are shown.

Although the shapes of the respective curves are the same, the center weights indicated by the dashed lines are different. This difference in center weight corresponds to the difference in weight of one wrap. As mentioned above, in a wrap former machine, the weight of a single wrap varies due to variations in the weight of the feedstock, ie, the sliver or wraps to be fed. Therefore, if the processed wrap is connected to the next process without changing the weight of one wrap, the wrap 1 will be processed at step B.
Even if the weight fluctuation in the longitudinal direction of the book is removed, the effect will be erased by the next process of doubling. Therefore, in the method of the present invention, in addition to the step of removing the weight fluctuation in the longitudinal direction of the wrap in step B, the weight fluctuation of one wrap is removed. In other words, each time a wrap is formed using the wrap former machine, the wrap is weighed, the weight of each wrap is measured, and the weight value of each wrap is compared with the target one home base weight value, that is, the standard weight value of one wrap. Detect the difference value, adjust the reference draft ratio of the draft part of the set lap former machine based on the diamond value, set the adjusted reference draft ratio, and adjust the length of the lap of stage B based on this adjusted reference draft ratio. This is a method for eliminating directional weight fluctuations. To explain this using Figure 1, if there is no change in the weight of one wrap, the process is performed at stage B using curve aIW1bl, and if there is a change in the weight of one wrap, curve aIW1b2
Or adjust the standard draft ratio like aIW1b3.
At this stage B, a tolerance range is set for the variation in the weight of one bottle,
It is preferable to issue a warning when a wrap having a weight exceeding the allowable range occurs, and to stop the wrap former machine if necessary. If this exceeds the allowable range, there is a cause such as draft breakage on the feed material side, so this can be eliminated.On the other hand, changing the standard draft ratio in one part of the draft part to the extreme is a new draft. This is because it is undesirable as it may lead to the occurrence of spots. Further, it is not necessarily necessary to adjust the reference draft ratio for each lap.

If the operation of the lapformer machine is stable, doffing may be performed every few doffings, every work shift, or every day. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the apparatus for eliminating single-wrap weight fluctuations and longitudinal weight fluctuations of the present invention will be described in detail below with reference to the accompanying drawings.

The device of the present invention for eliminating weight fluctuations in one lap and longitudinal weight fluctuations includes a standard draft ratio adjustment mechanism for setting an adjustment standard draft ratio for eliminating weight fluctuations in one lap, and the standard draft ratio adjustment mechanism. and a draft ratio control mechanism that eliminates longitudinal weight fluctuations of the wrap with reference to the adjusted reference draft ratio.

FIG. 2 shows an embodiment of a device for eliminating single-wrap weight fluctuations and longitudinal weight fluctuations of the present invention. shows the diagram.

In FIG. 2, the part surrounded by broken line A shows the block diaphragm of the reference draft ratio adjustment mechanism, and the part surrounded by broken line B shows the draft ratio control mechanism. The reference draft ratio adjusting device A is composed of a weighing device, a comparator, a comparison calculator, and an alarm device.

The weigher is a device that weighs the weight of one wrap that has been doffed after being wound to a certain length by the winding means of the wrap former machine.Weighting is performed every time the doffing is performed, and this weighed value is sent to a comparator as an electrical signal. is output to. Upper and lower limit values for the weight of one wrap are set in the comparator. The comparator is a device that compares the electric signal input from the scale with the upper and lower limit set values, and outputs a signal to the alarm device if the electrical signal is outside the upper and lower limit set values. The warning device includes a flashing lamp and/or a warning buzzer, and also has a signal transmitting device for stopping the drive device of the lap former machine. On the other hand, if the signal from the weighing device is within the upper and lower limit set values, the signal is output to the comparator.

A center weight setting value corresponding to the target weight per unit length of the wrap formed by the wrap former machine is set in the comparator. The comparison calculator - Compares the electrical signal input from the comparator with the center weight setting value, calculates the deviation value from the value measured up to the previous time, and calculates and outputs the weighted average of the value in a geometric series. It is a device. The output from the comparator is input to the draft ratio control mechanism B. As mentioned above, in the standard draft ratio adjustment mechanism, the deviation value between the weighed value of one wrap formed by the wrap former machine and the center weight setting value corresponding to the target weight per unit length of the wrap is calculated up to the previous time. Since the measured values are weighted and averaged in a geometric series and output to the draft ratio control mechanism, the standard draft ratio used by the draft ratio control mechanism is adjusted.

For example, if the weighed value of one wrap is 3% heavier than the center weight set value, the draft ratio control mechanism will operate based on the adjusted standard draft ratio that is 3% higher than the standard draft ratio. In this case, if there is a significant difference in the measured value of the weight of a single wrap formed by the wrap former machine with respect to the center weight setting value, the adjustment reference draft ratio will be significantly different from the reference draft ratio. The draft mechanism of the lap former machine has a standard draft ratio set so that the supplied sliver or wrap can be properly drafted, so drafting is performed using an adjusted standard draft ratio that is significantly cornered than the standard draft ratio. If this happens, draft spots will occur on the formed wrap. Since it is undesirable for such a draft to occur, the comparator of the standard draft ratio adjustment mechanism is configured to have upper and lower limit set values so that the wrap former machine stops in a range where proper draft cannot be guaranteed. There is. In this embodiment, the upper and lower limit set values are set within 2% soil based on the weight of one wrap. If the upper and lower limit set values are exceeded, this is mainly due to the fact that the weight of the supplied sliver or wrap is not as specified, so the sliver or wrap may be removed or adjusted. Next, the draft ratio control mechanism B will be explained.

As shown in FIG. 2, the draft ratio control mechanism B includes a storage device,
It consists of a draft ratio changing mechanism and a storage device operating mechanism.
A draft ratio for eliminating longitudinal weight fluctuations of the wrap is stored in the storage device.

Then, a signal corresponding to the required draft ratio is generated in response to the progress of the lap processed in the draft part by receiving an instruction from the storage device from the storage device operating mechanism that is linked to the rotation of the main motor that drives the entire lap former machine. Issued to the draft ratio changing mechanism. The draft ratio stored in the storage device refers to the characteristics of the wrap forming mechanism of each wrap former machine to which the device for eliminating single wrap weight fluctuations and longitudinal weight fluctuations of the present invention is attached, that is, the characteristics of the wrap former machine. The tendency value of the longitudinal weight fluctuation of the wrap, which occurs due to the change in the outer diameter of the wrap during winding, is determined by cutting the wrap at regular lengths and weighing it. This is the draft ratio determined. FIG. 3 shows an example of the trend value of the weight fluctuation in the longitudinal direction of the wrap. In FIG. 3, the vertical axis shows the weight per unit length of the wrap, and the horizontal axis shows the length of the wrap in the longitudinal direction. In the example shown in FIG. 3, the wrap gradually becomes heavier from the beginning, becomes heaviest near the end, and then becomes lighter again. Therefore, the draft ratio stored in the storage device is such that the weight per unit length of each portion of the wrap is 3.
It is sufficient that the weight is set to the average weight per unit length shown by the dashed line 22 in the figure. That is, when the portion of the wrap corresponding to the portions 1 to 4 on the horizontal axis in FIG. When the portion of the wrap corresponding to the portion indicated by 5 to 10 is processed in the wrap former machine, a draft ratio higher than the standard is given corresponding to the curve 21 and the dash-dotted line is applied over the entire length of the wrap. The draft ratio may be set so that the weight per unit length is as shown in 22). The draft ratio may be stored continuously or intermittently.

In other words, in the case of continuous recording, for example, the curve 21 shown in FIG. 3 is used as the stored draft ratio, and the curve 21 is sequentially followed by a phototube, and the vertical change in FIG. 3 is taken out from the storage device as an electrical signal. Bye. In addition, in the case of recording between songs, the longitudinal direction of the rap is divided into a plurality of parts, the trend value is grasped, and the same number of storage elements as the number of the divided parts are provided in the storage device, and each storage element is A draft ratio that cancels the tendency value of each divided portion may be stored, and as the lapping process progresses, the corresponding draft ratio may be sequentially extracted from the storage element as an electrical signal. The draft ratio changing mechanism is a mechanism that receives a signal obtained by adding the signal from the reference draft ratio adjusting device A to the signal from the storage device and changes the draft ratio of the draft part.

FIG. 4 shows an embodiment of the draft ratio changing mechanism. The draft ratio changing mechanism in FIG. 4 consists of a motor control section 38, control motor mechanisms 39 and 80, and a differential gear 42. The motor controller 38 is a mechanism that amplifies a signal from the storage device, that is, a voltage value in this case, and transmits it to the control motor mechanism. The control motor mechanism consists of a control motor 39 and a mechanical coupling means such as a reducer 40. The control motor 39 generates a rotational force at a rotational speed corresponding to the voltage amplified by the motor control section 38, and the mechanical coupling means The rotational force is transferred to the differential gear 4.
2. This differential gear 42 has a control motor 39
In addition to the rotational force from the draft part, a rotational force set to give a reference draft ratio to the draft part is transmitted. That is, as shown in FIG. 4, an input shaft 41 is connected to one end of the writing gear 42, and the rotational force from the main motor is applied to the input shaft 41 through a plurality of mechanical coupling mechanisms to adjust the standard draft ratio of the draft part. The rotation speed is converted to correspond to the given rotation speed. As a result, the rotational speed becomes a combination of the rotational speed of the output shaft 43 of the differential gear 42 and the rotational speed of the rotational force from the main motor. This combined rotation speed is given to the draft part. As is well known, the draft part of the wrap former machine is composed of a plurality of pairs of draft rollers.

one pair of draft rollers among the plurality of pairs of draft rollers;
The combined rotational speed is given to the back bottom roller of the kojitsune. On the other hand, the other draft rollers are rotated by the main motor via a predetermined mechanical connection mechanism.
Therefore, since the combined rotational speed varies according to the draft ratio set to cancel the weight fluctuation value in the longitudinal direction of the wrap stored in the standard draft ratio adjusting device A and the storage device, the draft part is The total draft of the passing lap will be changed. The storage device operating mechanism is a device for instructing the timing of retrieval of a corresponding draft ratio from the storage device during the formation of one wrap.

When the draft ratio is stored continuously as described above, for example, a sheet of paper with a curve 21 as shown in FIG.・It is sufficient to move it between both end positions. Alternatively, the paper may be fixed and the optical tube may be moved relative to the paper in accordance with the winding of the wrap.
On the other hand, when interludes are stored as described above, a pulse generator is attached to any part of the lap former machine that is linked to the rotation of the main motor, the pulses from the pulse generator are counted by a counter, and the interludes are recorded. The configuration may be such that a signal is extracted from a storage element in the storage device every count value corresponding to the interval. Since the method and apparatus for eliminating single-wrap weight fluctuations and longitudinal weight fluctuations of the present invention are constructed as described above, weight fluctuations per unit length within one wrap are eliminated, and one-wrap weight fluctuations are eliminated. This also means that weight fluctuations from time to time are also removed.

Therefore, the long-term symmetry of the yarn edged from the wrap made using the method and apparatus of the present invention is very good.

[Brief explanation of the drawing]

FIG. 1 is a diagram comparing and explaining the basic structure of the weight of the wrap in a wrap former machine with the conventional method and the method of the present invention, and FIG. 2 is a block diagram of an embodiment of the apparatus of the present invention. FIG. 3 is a graph showing the same amount of longitudinal weight fluctuation of the wrap, and FIG. 4 is a diagram showing an example of the draft ratio changing mechanism used in the apparatus of the present invention shown in FIG. 2. In the figure, A is a reference draft ratio adjustment mechanism, B is a draft ratio control mechanism, 21 is a curve showing the longitudinal weight fluctuation of the wrap, 22 is a straight line showing the average weight per unit length, 38 is a motor control section, and 39 is a control motor, 40 is a speed reducer, 41
Reference numeral 42 indicates the input shaft of the driving force from the main motor, 42 indicates the output shaft of the sardine gear, and 43 indicates the output shaft of the sardine gear. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A method for eliminating single-lap weight fluctuations and longitudinal weight fluctuations in a lap former machine that doubles, drafts, and winds a sliver or lap to form a lap, the method comprising: The draft means of the wrap former machine is configured to measure the weight of one lap formed by the method, compare the weighed value with the standard weight of one lap, detect the difference value, and set the draft means based on the difference value. The step of adjusting the reference draft ratio of the wrap and setting the adjusted reference draft, the characteristics of the wrap forming mechanism in the wrap former machine, and the trend value of longitudinal weight fluctuation of the wrap caused by changes in the outer diameter of the wrap during winding the wrap. The draft ratio set to cancel the trend value is sequentially added to the adjustment reference draft ratio of the drafting means of the lap former machine as the lap formation progresses, and the laps generated in the lap former machine are and removing longitudinal weight variations of a lap. 2. A device for eliminating single-lap weight fluctuations and longitudinal weight fluctuations in a lap former machine comprising a sliver or lap doubling means, a sliver or lap drafting means, and a lap winding means,
a reference draft ratio adjustment mechanism for setting an adjusted reference draft ratio to eliminate single weight fluctuations of the lap; and a reference draft ratio adjustment mechanism for removing longitudinal weight fluctuations of the lap with reference to the adjusted reference draft ratio from the reference draft ratio adjustment mechanism; a draft ratio control mechanism, wherein the reference draft ratio adjustment mechanism includes a weighing device, a comparator, a comparison calculator, and an alarm device, and the weighing device is wound up to a predetermined length by the winding means. This is a device that measures the weight of one dopped lap and outputs it as an electrical signal to the comparator, and the comparator measures the upper limit and/or It includes a storage means for storing and storing a lower limit single lap weight value, and the single lap weight value outputted as an electric signal from the scale is set as the upper limit or lower limit single weight value in the storage means. In comparison, when the weight of one of the laps is within the predetermined width, an electric signal is output to the comparator, and on the other hand, when the weight of one of the laps is outside the predetermined width, the alarm device outputs an electric signal to the comparator. The device outputs an electrical signal to the device, and the comparator includes storage means for summarizing and storing a desired single weight value of the lap, compares it with the electrical signal from the comparator, and calculates the deviation value by an equal ratio. The device calculates an adjustment reference draft ratio by weighted averaging in a series and outputs it to the draft ratio control mechanism, and the alarm device receives an electric signal from the comparator and generates a signal to stop driving the lap former machine. The draft ratio control mechanism includes a storage device, a storage device operating mechanism that outputs a signal for operating the storage device, and a draft ratio changing mechanism that operates based on a signal from the storage device, and the draft ratio control mechanism shall memorize the characteristics of the lapforming mechanism in the lapformer machine and the draft ratio set to cancel the tendency of longitudinal weight fluctuations that occur due to changes in the outer diameter of the lap when winding the lap. A device for eliminating single-lap weight fluctuations and longitudinal weight fluctuations, characterized by: 3. The device for eliminating single-lap weight fluctuations and longitudinal weight fluctuations according to claim 2, wherein the alarm device is provided with a lamp and/or a buzzer that is activated in response to a signal from the comparator. .