JPH0347341B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for improving the operating rate of a loom that manufactures textiles, and more specifically, the present invention is an apparatus for improving the operating rate of a loom that manufactures textiles. The present invention relates to a device that improves the overall operating rate by operating a machine.

(Prior Art) Conventionally, efforts to improve the operating rate of looms have been directed solely to improving the operating rate of individual looms themselves. For example, by properly maintaining the loom, the number of warp and weft breaks can be reduced, thereby reducing downtime. The aim is to improve the splicing skills of the thread holder (called a stand holder) to shorten the splicing time, and to reduce friction when the warp and weft intertwine by applying a sizing process to the warp threads. Therefore, efforts have been made to improve the operating rate of looms by taking various measures, such as reducing warp and weft breakage and reducing downtime. In addition, based on our many years of experience in operating looms, we have explored ways to optimize the number of looms and the number of loom owners.
Determine the number of looms to be spliced per person,
Efforts have also been made to improve the operating rate of the entire loom fleet.

(Problems to be Solved by the Invention) However, all of the above-mentioned measures to improve the loom operating rate are effective to some extent on the premise that both the warp and weft yarns are continuously supplied without interruption. If there are frequent stoppages while waiting for yarn supply, even if such measures and efforts are taken, it will become meaningless. In other words, the raw yarn processing process (dyeing and twisting of raw yarn), which is a pre-process of the weaving process, and the supply of raw yarn from the spinning process to the weaving process are not always carried out as planned, resulting in delays of one to two weeks, and sometimes delays. The reality is that there is a delay of more than one month. Furthermore, in recent years, with the diversification of textiles and the trend toward small lots of a wide variety of products, it is necessary to use different types of yarn for each loom, and the types of yarn used have increased significantly. The waiting time for warp beams and weft threads has become increasingly severe, and this has forced an increase in the time the loom is stopped.

Therefore, if we speed up the arrangement of yarn to solve the above problem, the number of stops due to waiting for yarn will be reduced, but it will increase the inventory of yarn in progress in the weaving process, resulting in a huge amount of capital and raw material. This causes other major problems, such as wasted space for storing yarn.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to suppress the unfinished stock of raw yarn in the weaving process, dynamically grasp the raw yarn supply status to the weaving process, and adjust the rotation speed of the loom based on this. The object of the present invention is to provide a loom operating rate improvement device that improves the operating rate of the entire loom group by controlling the looms.

(Means for Solving the Problems) Hereinafter, the configuration of the loom operating rate improving device of the present invention will be explained based on FIG. 1.

Reference numeral 100 denotes a loom yarn amount measuring means for measuring the amount of yarn set in each of a plurality of looms for each warp and weft.

Reference numeral 101 denotes yarn inventory monitoring means for determining the inventory amount of warp and weft yarns.

Reference numeral 102 denotes a yarn arrival date and time grasping means for grasping the delivery date of warp and weft yarns.

Reference numeral 103 denotes a warp beam inventory grasping means for grasping the amount of warp beams in stock.

Reference numeral 104 denotes a warp beam creation time determining means for determining the time required to create the warp beam depending on the load condition of the warping process.

Reference numeral 105 indicates the current amount of weft in progress obtained from the loom in-process yarn amount measuring means 100, the weft inventory amount for each loom obtained from the yarn inventory grasping means 101, and the estimated yarn arrival date and time grasping means 102. This is a weft supply duration measuring means that measures the time during which weft can be continuously supplied to each loom based on the scheduled arrival date and time of the weft.

Reference numeral 106 denotes a warp supply duration measuring means that measures the time during which warp threads can be continuously supplied to each loom based on the amount of remaining threads in the warp beam at the present time obtained by the loom in-process thread amount measuring means 100.

107 is a time period during which the loom stops waiting for weft supply, based on the date and time when weft supply cannot be continued, which is obtained from the weft supply duration measuring means 105, and the scheduled weft arrival date and time, which is obtained from the scheduled yarn arrival date and time grasping means 102. This is a weft waiting time measuring means for measuring the weft waiting time.

108 is the date and time when warp supply cannot be continued, which is obtained from the warp supply duration measuring means 106, and the warp beam creation date and time, which is obtained from the warp beam stock grasping means 103, the yarn stock grasping means 101, and the warp beam creation time grasping means 104. This is a warp waiting time measuring means for measuring the time during which the loom stops waiting for the warp to be supplied.

A rotation speed instruction 109 determines and instructs the rotation speed of each loom from the weft supply duration obtained from the weft supply duration measurement means 105 and the warp supply duration obtained from the warp supply duration measurement means 106. This is means A.

110 ascertains the weft supply duration time and the warp supply duration time for each loom, and based on this, the weft waiting time obtained by the weft waiting time measuring means 107;
This is a rotation speed instructing means B that determines and instructs the rotation speed of each loom from the warp waiting time obtained by the warp waiting time measuring means 108.

Reference numeral 111 denotes an adjusting means for adjusting the rotational speed instructions issued from the rotational speed indicating means A109 and the rotational speed indicating means B110.

Reference numeral 112 denotes a rotation speed control means for controlling the rotation speed of each loom according to the rotation speed adjusted by the adjustment means 111.

The loom operating rate improvement device of the present invention includes the above-mentioned loom in-process yarn amount measuring means 100, raw yarn stock grasping means 101, raw yarn arrival date and time grasping means 102, warp beam stock grasping means 103, and warp beam creation necessary means. Time grasping means 104, weft supply duration measuring means 105, warp supply duration measuring means 106, weft waiting time measuring means 107, warp waiting time measuring means 108, rotation speed indicating means A109, rotation speed indicating means B110, adjusting means 111 , rotation speed control means 112.

(Function) Therefore, the amount of remaining yarn of each of the warp and weft threads set in the loom is determined by the loom thread amount measuring means 1.
00 for each loom of the loom, and on the other hand, the amount of yarn in stock, which is a raw material for textiles, is grasped for each loom by the yarn inventory grasping means 101, These pieces of information are input to the weft supply duration measuring means 105.

In addition, the yarn arrival date and time grasping means 102 includes:
The delivery date to the weaving process notified from the spinning process or yarn processing process is stored, and the weaving process knows when the yarn will arrive from the spinning process or yarn processing process, which is the previous process, that is, the raw yarn. The scheduled arrival date and time of raw yarn and the amount of yarn are grasped for each loom of the loom where the yarn is scheduled to be used, and these are also input into the weft supply duration measuring means 105.

Then, the weft supply duration measuring means 105
The loom in-process yarn amount measuring means 1 inputted to this
The duration of weft supply is measured using the current amount of weft in progress according to 00, the weft inventory amount for each machine by the yarn inventory grasping means 101, and the scheduled arrival date and time of yarn according to the yarn scheduled arrival date and time grasping means 102. do.

On the other hand, regarding the warp, the warp supply duration is measured by the warp supply duration measuring means 106 using the remaining quantity of the warp beam at the present time obtained by the loom in-process thread quantity measuring means 100.

After the supply duration of both yarns is measured in this way, the waiting time of each yarn is then measured. That is, for the weft yarn, the date and time when it becomes impossible to continuously supply the weft yarn to the loom is determined from the weft yarn supply duration (the date and time when weft yarn supply cannot be continued), and this date and time is determined by the raw yarn arrival date and time grasping means 102. The amount of time the loom will stop due to lack of weft is determined by subtracting it from the scheduled arrival date and time of the yarn. For one of the warps, first, the presence or absence of the warp beam is checked by the warp beam inventory grasping means 103, and if there is a warp beam to be set, the beam with no warp is removed from the loom, and the next warp beam is placed on the loom. The time required to set the warp is the warp waiting time. If there is no warp beam to be set for this, the time required to create the warp beam can be determined based on the arrival date and time of the warp to the weaving process obtained by the yarn inventory checking means 101 and the expected yarn arrival date and time checking means 102. Means 10
By adding the time required to create the warp beam obtained from step 4 (warp beam creation time), the date and time when the warp beam can be created is measured. Further, from the warp supply duration measured by the warp supply duration measuring means 106, the date and time when the currently installed warp beam runs out of warp is determined,
By subtracting this from the time required to create the warp beam, the time during which the loom stops due to no warp is calculated as the warp waiting time.

When the supply duration and waiting time are measured for each of the warp and weft as described above, control is performed to change the rotational speed of the loom based on these. At this time, the warp and weft supply durations are input to the rotational speed indicating means A109, and the rotational speed indicating means A109 grasps the weft and warp supplying durations for all looms, and determines the length of this time. Give instructions to change the rotation speed of the loom depending on the situation. On the other hand, the respective waiting times for the warp and weft are input to the rotation speed indicating means B110, and the rotation speed indicating means B110 grasps the weft waiting time and the warp waiting time for all looms, and also determines the supply duration of the warp and weft. Based on this, instructions are given to change the rotation speed of the loom.

In this way, the two rotation speed indicating means A109 and B
The rotation speed instructions outputted from 110 are both input to the adjustment means 111, and the rotation speed instructions adjusted by the adjustment means 111 are input to the rotation speed control means 112.
The rotational speed of the loom is controlled to an appropriate rotational speed for the loom.

In other words, by creating a difference between the rotational speed of a loom with a large amount of raw yarn that is being loaded or can be loaded on the loom, and the rotational speed of a loom with less yarn remaining, a difference will inevitably occur in the frequency of yarn cutting. , the time spent on splicing is reduced for the less frequent looms, i.e. the looms with fewer threads left and the rotational speeds are lowered, and as a result, the time spent on splicing is reduced for the looms with less thread left and the rotational speeds are higher. will be concentrated and the overall operating rate will be improved.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Figure 2 shows an overview of the device of this embodiment, where 1 is an input device such as a keyboard, 2 is a display device such as a CRT display or printer, and 3 is a CPU.
(Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory),
A microcomputer consisting of an I/O port, etc., 4 is an auxiliary storage device such as a magnetic disk or magnetic tape, 5 is a rotation speed control device that controls the rotation speed of the loom, and 6 is a loom that monitors the operating status of all looms. This is a driving status monitoring device, and each device is connected through an interface circuit.

The auxiliary storage device 4 includes a yarn inventory file 4a that stores the amount of raw yarn in stock for textiles woven by looms for each warp and weft and for each loom, and a yarn inventory file 4a for storing the raw yarn inventory amount of textiles woven by looms and for each loom, and a spinning process or yarn processing that is a pre-process of the weaving process. A yarn arrival schedule file 4b that stores the scheduled date and time of yarn arrival from the process to the weaving process and its quantity for each warp and weft and for each loom.
, a warp beam inventory file 4c that stores the amount of warp beams in stock, and a warp beam creation time file 4d that stores the time required to create warp beams for each loom. That is, the yarn inventory file 4a is the yarn inventory grasping means 10.
1, the yarn arrival schedule file 4b is used as the yarn arrival scheduled date and time grasping means 102, the warp beam inventory file 4c is used as the warp beam inventory grasping means 103, and the warp beam creation time file 4d is the warp beam creation time file 4d. Grasping means 10
It is used as 4.

Further, this auxiliary storage device 4 stores master tables A to D.

For example, in the master table A, the looms are divided into classes according to the weft supply duration and warp supply duration in the format shown in FIG.
The number of revolutions per minute is registered. In the example shown in the figure, if the supply duration is 12 hours or more for both the warp and the weft, the class is A1 and the number of revolutions is 400 per minute.

Furthermore, in the master table B, classification of looms based on weft waiting time is registered in the format shown in Figure 4, for example, and on the other hand, classification of looms based on warp waiting time is registered in the format shown in Figure 5, for example. Classification is registered in master table C. Then, in the master table D, the number of rotations per minute of the loom is registered for all combinations of each class classified in the master tables A, B, and C, respectively, in the format shown in FIG. 6, for example. There is. As can be seen from the example in the same figure, the rotation speed of the loom is different in classes where the warp supply duration is longer (for example, classes A2, A3, and A4), and in classes where the weft waiting time is shorter (for example, in classes where the weft waiting time is shorter).
B1, B2, B3), and conversely, in classes with longer weft supply durations (e.g. classes A5, A6, A7), the shorter the warp waiting time (e.g. classes C1, C2, C3), the higher the It has been set and registered. This is done in consideration of the fact that if either the warp or the weft cannot continue to be supplied first, the shorter the waiting time, the sooner the loom can resume operation. In the example shown in the figure, if the warp supply duration and weft supply duration are both 12 hours or more and belong to class A1, and the weft waiting time is less than 0.5 hours, that is, class B1, the warp waiting time About class C1~
The number of revolutions per minute of the loom is designated as C5.
It is registered as 400, 395 for C6, and 390 for C7.

Note that the numerical examples shown above are values for convenience of explanation, and do not necessarily match actual values.

The ROM of the microcomputer 3 mainly stores the following programs, including the loom in-process yarn amount measuring means 100, the weft supply duration measuring means 105, the warp supply duration measuring means 106, and the weft waiting time. They are used as the measuring means 107, the warp waiting time measuring means 108, the rotation speed indicating means A109, the rotation speed indicating means B110, and the adjusting means 111. That is, a program for adding, updating, and deleting the contents of the master tables A, B, C, and D using the input device 1 and the display device 2, and a program for adding, updating, and deleting the contents of the master tables A, B, C, and D using the input device 1 and the display device 2; , the yarn arrival schedule file 4b, the warp beam inventory file 4
c. From the program for adding, updating, and deleting the contents of the warp beam creation time file 4d and the loom operating status monitoring device 6, the amount of warp of the warp beam set on the loom, the amount of weft, and the amount of weft for each loom. A program that imports loom data such as the date and time when the machine started operating, and the date and time when it stopped, the data of this loom and the data of the yarn inventory file 4a,
The weft supply duration, warp supply duration, weft waiting time, and warp waiting time for each loom are determined from the data in the raw yarn arrival schedule file 4b, the data in the warp beam inventory file 4c, the data in the warp beam creation time file 4d, etc. A program for calculating time, a program for calculating the weft supply duration for each loom, the warp supply duration, and the rotation speed A for each loom from the master table A, and a program for calculating the rotation speed A for each loom from the master tables B, C, and D. The rotation speed control device 5 adjusts the value between the rotation speed A and the rotation speed B by using a program to obtain another rotation speed B.
This is the program to be sent to. However, these programs do not necessarily need to be stored in the ROM, and may be stored in the auxiliary storage device 4, loaded into the RAM, and then executed.

The rotation speed control device 5 is a microcomputer 3
The rotation speed of all the looms is controlled based on the specified rotation speed.

Next, a specific example of the processing performed by the microcomputer 3 will be explained using flowcharts shown in FIGS. 7 to 9.

FIG. 7 is a flowchart of a program for determining the weft supply duration. In the step shown in the figure, the amount of weft yarn in stock for each loom is read from the raw yarn inventory file 4a and input into the microcomputer 3.

In the step, the amount of weft yarn in the loom is determined by the following formula (a) based on the data of the loom, such as the amount of raw yarn initially set and the time since the start of operation.

(Amount of weft in progress) = (Amount of weft initially set) -
(Amount of weft yarn used per unit time) × (Loom operating time from the start of work to the present)
In the −(a) step, the weft supply duration is measured by the following equation (b).

(Weft supply duration) = (Weft inventory) + (Current amount of weft in progress) / (Weft usage per unit time) - (B) The weft usage per unit time in the above formula (B) is It is the rate at which the weft yarn is consumed during normal operation, and its unit is kilograms per hour. In addition, the current amount of weft in progress is the amount of weft threads set in the loom, and the product of the elapsed time from the start of weft up to the present time and the amount of weft used per unit time is calculated at the time of start of weft. It is measured by subtracting it from the amount of work in progress.

In the step, the yarn arrival scheduled file 4 is
The scheduled yarn arrival date and time is read from b, and it is determined whether the weft supply to the loom will continue until the next scheduled yarn arrival date and time. When it is determined that the loom can continue to operate until the scheduled arrival date and time of the yarn, the process proceeds to step.

In the step, the yarn arrival scheduled file 4 is
The expected arrival amount of raw yarn is read from b, and the following formula (c) is added to the weft supply duration, and this value is set as the weft supply duration.

(Scheduled arrival amount of yarn)/(Weft usage amount per unit time)
-(c) However, if it is determined in the above judgment that the operation of the loom cannot be continued, the value obtained in step is taken as the weft supply duration.

In the step, it is checked whether there is a next yarn arrival schedule following the step by searching the yarn arrival schedule file 4b, and if there is, the process returns to the step, and if not, the value obtained in the step is used to continue the weft supply. It is time.

Next, a method for calculating the weft waiting time will be explained based on the flowchart of the program for calculating the weft waiting time shown in FIG.

First, in step, the date and time when weft supply cannot be continued is determined using the following equation (d).

(Date and time when weft supply cannot be continued) = (Current date and time)
+(Weft supply duration)-(d) Next, in the step, the scheduled arrival date and time of the yarn is read from the yarn arrival schedule file 4b.

Then, in the step, the above-mentioned date and time when weft supply cannot be continued is compared with the scheduled yarn arrival date and time, and if the scheduled yarn arrival date and time is earlier, return to the step and read the next scheduled yarn arrival date and time, and if it is later, The following formula
Calculate the weft waiting time using (e).

(Weft waiting time) = (Estimated arrival date and time of yarn) -
(Date and time when weft supply cannot be continued) - (E) Next, the other warp will be explained based on the flowchart of the program for determining the warp waiting time shown in FIG.

First, in step, the presence or absence of a warp beam is read from the warp beam inventory file 4c, and if there is a warp beam, the process advances to step; otherwise, the process advances to step.

In the step, the warp waiting time is the time required to remove the beam with no warp threads, set the warp beam in stock on the loom, and restart the loom operation.

In the step, first, based on the above-mentioned loom data, the remaining yarn amount of the warp beam is determined by the following equation (f), and then using this, the warp supply duration is determined by the following equation (g).

(Amount of yarn remaining on the warp beam) = (Amount of yarn on the first warp beam set) - (Amount of warp used per unit time) × (Loom operating time from the start of work to the present) -
(F) (Warp supply duration) = (Amount of yarn remaining on the warp beam) / (Warp usage amount per unit time) - (G) Next, using the warp supply duration determined above, use the following formula (H). Find the date and time when warp supply cannot be continued.

(Date and time when warp supply cannot be continued) = (Current date and time) + (Warp supply duration) - (H) In the step, the time required to create the warp beam is determined from the warp beam creation time file 4d.

In the step, the yarn inventory file 4a is searched to see if there is a warp needed to create a warp beam, and if there is, the process advances to the step; if not, the process advances to the step.

In the step, the warp beam creation date and time is calculated by adding the time required to create the warp beam obtained in the step to the current date and time.

On the other hand, in the step, the expected warp arrival date and time is read from the yarn arrival schedule file 4b, and the warp beam creation date and time is determined by adding the time required for creating the warp beam to this.

In this step, this warp beam creation date and time is compared with the date and time when the warp supply cannot be continued, which was found in the step, and if the date and time when the warp supply cannot be continued is later, the process returns to the step, and if it is earlier, the process advances to the step.

In the step, the warp waiting time is determined by the following equation (i).

(Warp waiting time) = (Warp beam creation date and time) -
(Date and time when warp supply cannot be continued) + (warp waiting time of step) - (li) When the supply duration and waiting time are measured for each warp and weft as described above, the rotation of each loom is determined based on these. Find the number. That is, as for the rotation speed A, the supply duration of the warp and weft is classified into classes as shown in Figure 3a of the master table A mentioned above, and the looms are classified by class as shown in Figure 3b, for example. Use the one determined by reading the rotation speed.

On the other hand, regarding the rotation speed B, the weft waiting time is classified into classes as shown in FIG. 4 of the master table B mentioned above, and the warp waiting time is classified into classes as shown in FIG. 5 of the master table C mentioned above. All the combinations of each class are created using the master tables A, B, and C, and the looms are transferred from the master table D to which the rotational speed of the loom is given for each combination as shown in FIG. 6, for example. Use the value obtained by reading the rotation speed of.

Finally, the rotation speed A and the rotation speed B obtained in this way are adjusted, one of the values is adopted, and this is input to the rotation speed control device 5.
This is because if all the data from the loom by the loom operating status monitoring device 6 is normally sent from the microcomputer, the value of the rotation speed B is adopted, but if some data from the loom is missing, the weft When the waiting time cannot be calculated, or when the warp waiting time cannot be calculated, the rotation speed A
This is done by instructing the rotation speed control device 5 of the rotation speed of the loom using the value of .

(Effects of the Invention) As described above, the loom operation rate improvement device of the present invention grasps the raw yarn supply situation to the loom, and increases the rotation of the loom where there are many warps and wefts that are being loaded or can be loaded into the loom. While increasing the number of threads to increase the productivity of the loom, the number of rotations of the loom, which will soon cut off the supply of warp and weft threads to the loom, is lowered to reduce the amount of warp and weft threads used per unit time of the loom. By doing so, the continuous supply of warp and weft yarns to the loom can be extended until the new warp and weft yarns arrive at the weaving process, making it possible to improve the operating rate of the entire loom group. In other words, if the loom will soon be unable to supply warp or weft to the loom, there is no need to increase the rotation speed considering that the loom will stop waiting for the yarn, but by lowering the rotation speed,
To reduce the frequency of thread cutting in this loom and reduce the time consumed by the stand holder for thread splicing work. As a result, the stand holder can increase the time consumed for splicing on a loom where both the warp and weft are supplied to the loom for a long time. As a result, wasted stop time and work time are eliminated, and the operating rate of the entire loom group is significantly improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining the configuration of the present invention, FIG. 2 is a block diagram showing one embodiment of the present invention, and FIGS. 3, 4, 5, and 6 are master table A. , B, C and D, 7th
The figure is a flowchart showing the procedure for determining the weft supply duration, FIG. 8 is a flowchart showing the procedure for determining the weft waiting time, and FIG. 9 is a flowchart showing the procedure for determining the warp waiting time. 1... Input device, 2... Display device, 3... Microcomputer, 4... Auxiliary storage device, 5...
Rotation speed control device, 6... Loom operation status monitoring device,
100... Loom in-process yarn amount measuring means, 101...
Yarn inventory grasping means, 102... Means for grasping the scheduled arrival date and time of yarn, 103... Warp beam inventory grasping means,
104...Means for determining the time required to create the warp beam, 1
05... Weft supply duration measuring means, 106...
Warp supply duration measuring means, 107... Weft waiting time measuring means, 108... Warp waiting time measuring means, 109... Rotation speed indicating means A, 110... Rotation speed indicating means B, 111... Adjustment means, 112 …
...Rotation speed control means.

Claims (1)

[Scope of Claims] 1 (a) A loom yarn amount measuring means for measuring the amount of yarn set in each of a plurality of looms for each warp and weft, and (b) Ascertaining the amount of warp and weft in stock. (c) means for ascertaining the expected arrival date and time of yarn for ascertaining the delivery date of warp and weft yarns; (d) means for ascertaining warp beam inventory for ascertaining the amount of warp beams in stock; (e) warping (f) means for determining the time required to create the warp beam according to the load status of the process; The time required to continuously supply weft to each loom is measured based on the weft inventory amount for each loom obtained by the yarn inventory grasping means and the scheduled arrival date and time of the weft obtained from the yarn stock arrival date and time grasping means. (g) from the remaining yarn amount of the warp beam at the current time obtained from the loom in-process yarn amount measuring means;
(h) a warp supply duration measuring means for measuring the time during which the warp can be continuously supplied to each loom; (h) a date and time when the weft supply cannot be continued, obtained from the weft supply duration measuring means, and a means for grasping the scheduled arrival date and time of the raw yarn. (i) a weft waiting time measuring means for measuring the time during which the loom stops waiting for weft supply from the expected weft arrival date and time obtained from the above-mentioned weft yarn arrival date and time; and the warp beam creation date and time obtained from the warp beam stock grasping means, the raw yarn stock grasping means, and the warp beam creation time grasping means, to measure the time during which the loom stops waiting for warp supply. (j) from the weft supply duration obtained from the weft supply duration measurement means and the warp supply duration obtained from the warp supply duration measurement means;
(k) a weft supply duration and a warp supply duration obtained from the weft supply duration measurement means and the warp supply duration measurement means; is grasped for each loom, and based on this, the rotation speed of each loom is determined from the weft waiting time obtained from the weft waiting time measuring means and the warp waiting time obtained from the warp waiting time measuring means, and an instruction is issued. rotational speed indicating means B; (l) adjusting means for adjusting the rotational speed instructions issued from the rotational speed indicating means A and the rotational speed indicating means B; and (m) the rotational speed adjusted by the adjusting means. A loom operating rate improvement device comprising a rotation speed control means for controlling the rotation speed of each loom according to the rotation speed. 2. The rotation speed indicating means A sets the shorter of the weft supply duration and warp supply duration measured for each loom as the yarn supply duration, and the higher the rotation speed of the loom with the longer yarn supply duration. 2. The loom operation rate improving device according to claim 1, wherein the loom outputs an instruction as the rotation speed is lower for a shorter loom. 3. The rotation speed indicating means B compares the warp supply duration and the weft supply duration for each loom, and in a group of looms where the former is longer, the loom with a shorter weft waiting time is set to a higher rotation speed, and the latter is set to a higher rotation speed. 2. The loom operating rate improving device according to claim 1, wherein in a long loom group, the loom with a shorter warp waiting time is given a higher rotational speed.