JP4119588B2 - Work production ratio controller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a workpiece production ratio control apparatus in a production line, and more particularly to an improvement in an apparatus for controlling a production ratio of workpieces supplied from a front stock line to a rear stock line via a processing machine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is used a continuous production apparatus that continuously performs a process from a process of processing a component element to a production of various parts to a process of assembling the produced various parts on a series of conveyance paths. One example is a vehicle assembly line in a factory. In addition, the assembly line of the vehicle is provided with a production line for producing and supplying a necessary quantity of parts necessary for assembly for each assembly section.
[0003]
The production line is generally provided corresponding to a plurality of types of parts (workpieces), and processes a plurality of previous stocklines that carry out the corresponding workpieces by a workpiece carry-out signal, and workpieces that are carried out from the previous stocklines. And a plurality of rear stock lines for storing processed workpieces by type. And the kind and quantity of each part in this production line are determined beforehand, and it can contribute to the improvement of work efficiency by always stocking the parts stored in the back stock line at the optimum ratio.
[0004]
In a production line that produces a plurality of workpieces as described above, Japanese Patent Publication No. 4-40146 discloses an apparatus for controlling the production ratio of workpieces supplied from the previous stock line to the rear stock line via the processing machine. There is a "Production Proportional Control Device for Production Lines". If this production proportional control device is used, it is possible to reduce the number of data by combining the workpiece supply sequence data and the thinning data, and the overall size of the device is reduced.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional production proportional control device, it is necessary for the user to create at least the supply sequence data and the thinning data of the workpiece, and to give this to the production proportional control device. The work supply order must be set after taking into account different factors depending on the type of work, such as the time and production ratio required for work production. There is a problem that it is necessary to prepare the order of combination by a skilled worker who is familiar with the production site.
[0006]
In addition, the production ratio of each workpiece is not necessarily constant, but rather the number of workpieces may increase or decrease due to defective machining of the workpiece or due to artificial reasons. In other words, if there is a change in the work production ratio, it will be necessary to change the supply sequence data and thinning data accordingly. There was also a problem that it was necessary to set data and thinned data.
[0007]
The present invention has been made in consideration of the above-mentioned matters, and the object of the present invention is to easily set and change the production proportion of the workpiece and to make the production ratio set efficiently. It is an object of the present invention to provide a workpiece production ratio control device for unloading workpieces in a proper order.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a workpiece production ratio control apparatus according to the present invention includes a plurality of front stock lines that are provided corresponding to a plurality of types of workpieces and carry out the corresponding workpieces by a workpiece carry-out signal, and the previous stock lines. In a production line having a processing machine that processes workpieces transported from the machine and a plurality of rear stock lines that store processed workpieces by type, each rear stock line is provided with a predetermined number of workpieces stored. A plurality of specified amount detection means for outputting a detection signal when reaching the number, and a programmable controller for outputting a work carry-out signal to each front stock line, and this programmable controller is a reference production ratio of each work by the user And the production ratio of each workpiece becomes the input standard production ratio, and each rear stocker Leveling calculation to determine the unloading order for outputting workpiece unloading signals as appropriate and the detection signals from each specified amount detection means are input to skip the unloading sequence of the workpieces. A computer-readable storage medium storing a proportional control program for instructing whether or not to output a workpiece unloading instruction, and a calculation unit for executing the proportional control program, wherein the proportional control program includes: Leveling Calculation This leveling calculation program corrects the input standard production ratio so that the sum becomes a predetermined size, and then performs the leveling calculation to show the output order of the workpiece unloading signal. Consists of order data Said It is programmed to create a carry-out order data table of a predetermined size, and perform leveling calculation of a data table method in which thinned data is added to the carry-out order data at an appropriate ratio, and the proportional control program is The workpiece unloading signal is output in accordance with the unloading sequence data table, while the workpiece unloading signal is output when the detection signal is input from the specified amount detection means of the rear stock line corresponding to the unloading sequence data to which the thinning data is added. The ratio at which the programmable controller inputs a detection signal from each specified amount detection means in order to skip the work carry-out instruction by the user can be set, and Let the programmable controller execute a calculation using a leveling calculation program It is characterized by having a force unit.
[0009]
Therefore, in the workpiece production ratio control device, by inputting the standard production ratio from the input unit, the user can arbitrarily change the standard of the production ratio of each group, and the production ratio of the workpiece by the production line can be changed. Can be tailored to the actual situation. In addition, since the proportional control program has a function to determine whether or not to skip the workpiece unloading order by inputting a detection signal from the specified amount detection means, the workpiece production ratio is reduced due to workpiece machining defects or artificial reasons. Even a slight change can be accommodated.
In addition, since it is possible to check the leveling work unloading order data, it is easy for the user to grasp the production instruction status.
Furthermore, the user can input the detection signal from each specified amount detection means at an arbitrary ratio, and can skip the output of the workpiece carry-out signal along with this detection signal. That is, the allowable range of the variation range of the workpiece production ratio relative to the reference production ratio can be easily set by the user.
[0010]
Storage over detection means for detecting that the number of workpieces stored in each rear stock line is sufficient, and the proportional control program detects the detection signals of all storage over detection means provided in each rear stock line. If the workpiece is programmed not to be instructed to be carried out when the workpiece is input, if for some reason the workpiece has accumulated too much in the rear stock line, the workpiece unloading instruction to the previous stock line is issued. It can be stopped and the work can be prevented from overflowing.
[0011]
The proportional control program sequentially adds the following series of processes, that is, the numerical values of the standard production ratio, respectively, to create accumulated data corresponding to each stock line. When it becomes larger, the output order of the work carry-out signal for the previous stock line corresponding to the accumulated data is set, and the output order of the work carry-out signal is sequentially repeated by repeating the process of subtracting the constant from the accumulated data. If you have a leveling calculation program that determines the number of workpieces, it is possible to determine the work carry-out order so that the same work is not as continuous as possible by simple addition, subtraction, and numerical comparison. Even if it can only perform the above-mentioned calculation processing, it is possible to perform leveling calculation that determines the exact work delivery order. Can.
[0012]
[0013]
When the leveling calculation program is programmed to perform leveling calculation of the leveling method at any time to obtain the output order of the workpiece carry-out signal at any time, and the proportional control program outputs the workpiece carry-out signal The workpiece is subjected to processing for skipping the output of the workpiece carry-out signal when a detection signal is input from the specified amount detection means of the rear stock line corresponding to the previous stock line which issues the workpiece carry-out instruction at an appropriate ratio. If you have an unloading instruction program, even if there is a large difference in the size of the standard production ratio, you can easily output a workpiece unloading signal that accurately reflects this standard production ratio and easily handle workpieces that are produced in small quantities. In addition, there is an advantage that the reference production ratio can be easily changed even during operation of the production line.
[0014]
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing an example of a workpiece production ratio control apparatus 1 according to an embodiment of the present invention. In FIG. 1, 2 a to 2 e are front stock lines provided corresponding to a plurality of types of work Wa to e, and 3 is to combine the works Wa to e carried out from the previous stock lines 2 a to 2 e together. Conveying conveyor 4 is a processing machine for processing a workpiece from the conveyor 3, 5 is an inspection / sorting sorter that sorts processed workpieces into Wa to We, and 6 is a conveyor that conveys the sorted workpieces Wa to We. , 7a to 7e are a plurality of rear stock lines for storing the workpieces Wa to We, and 8 is a programmable controller for outputting workpiece unloading signals to the stock lines 2a to 2e.
[0016]
In the following example, the types of workpieces handled by the production ratio control device 1 are described as five types, and each has five workpieces Wa to We, front stock lines 2a to 2e, and rear stock lines 7a to 7e. However, in practice, it is possible to control the production ratio of more workpieces. In other words, it goes without saying that the present invention does not limit the types of workpieces to five types, whether it is four or fewer types of workpieces or six or more types of workpieces. The production ratio can be controlled.
[0017]
Each rear stock line 7a-7e has a ratio change limit switch La as a specified amount detection means. ₁ ~ Le ₁ , And limit switch La as a storage over detection means for detecting that the number of stored workpieces Wa to We is sufficient ₂ ~ Le ₂ Is provided. These limit switches La ₁ ~ Le ₁ , La ₂ ~ Le ₂ It is desirable that the position to be provided is located at a position where it can be detected that the accommodation number is a specified amount or a sufficient amount according to the production ratio of the workpieces Wa to We.
[0018]
That is, for example, the limit switch Le provided in the rear stock line 7e when the production ratio of work Wa: work We is 2: 1. ₁ The third position of the workpiece, limit switch Le ₂ Is placed at the sixth workpiece position, the limit switch La provided on the rear stock line 7a ₁ The position of the sixth workpiece, limit switch La ₂ Is desirably arranged at the position of the 12th workpiece. By doing so, it is possible to prevent the number of workpieces with a high production ratio (fast rotation) from being stored shortly, and an unnecessarily large amount of workpieces with a low production ratio (slow rotation) can be accommodated. .
[0019]
FIG. 2 is a diagram showing an example of the configuration of the programmable controller 8. In FIG. 2, 9 is an arithmetic unit for performing various arithmetic processes in the programmable controller 8, 10 is a recording medium readable and writable by the arithmetic unit 9, 11 is setting information such as a reference production ratio R set by the user, A display unit that outputs display information indicating the operation status of the production ratio control device 1, 12 is a touch panel type input unit formed on the surface of the display unit 11, 13 is an input interface for inputting an external signal, and 14 is It is an output interface for outputting a control signal from the production ratio control device 1 to the outside.
[0020]
The input interface 13 includes the limit switches La. ₁ ~ Le ₁ , La ₂ ~ Le ₂ Detection signal Sa from ₁ ~ Se ₁ , Sa ₂ ~ Se ₂ Further, a transfer completion signal Sf, which will be described later, is input, and work output signals Ca to Ce are output from the output interface 14 to the front stock lines 2a to 2e.
[0021]
P is a proportional control program executed by the calculation unit 9, and R ′ is a predetermined size that matches the reference production ratio R with the size of a carry-out order data table T (hereinafter referred to as the number of frames L), which will be described later. Standard production ratio corrected to L, P ₁ Is a leveling calculation program for calculating the reference production ratio R ′ and calculating the unloading order of the workpieces Wa to We using the reference production ratio R ′, and T is the leveling calculation program P ₁ Unloading order data table generated by P, ₂ Is an unloading instruction program for outputting the work unloading signals Ca to Ce in the order according to the unloading order data table T.
[0022]
These programs P, P ₁ , P ₂ Is executed in the arithmetic unit 9 and is illustrated in the arithmetic unit 9, but the present invention is not limited to the programs P, P ₁ , P ₂ Is not limited to the place to record the normal program P, P ₁ , P ₂ Is recorded in the recording medium 10 (usually a memory such as a RAM or a ROM, which is hereinafter referred to as the memory 10 but may be an auxiliary storage device such as a hard disk). Similarly, the standard production ratios R and R ′ and the carry-out order data table T are generally recorded in the memory 10, but it is also conceivable that all these pieces of information are formed by registers in the calculation unit 9. .
[0023]
The programmable controller 8 skips the workpiece unloading instruction when the display unit 11 inputs the previous reference production ratios Ra to Re, the number of frames L, and the detection signals from the respective predetermined amount detection means of each workpiece Wa to We. Ratio r, and various buttons B that allow the user to operate the programmable controller 8 by operating a touch panel type input unit (hereinafter simply referred to as a touch panel) 12. ₁ ~ B ₃ And numeric keypad K are displayed. That is, the user can freely change the above-described numerical values R to Re, L, and r by operating the touch panel 12. When various numerical values are set, execution button B ₁ By pressing the touch panel 12 on which is displayed, the leveling calculation program P ₁ The calculation by is executed.
[0024]
FIG. 3 shows the leveling calculation program P ₁ It is a figure which shows the example of the leveling calculation by. In FIG. ₁ Is the standard production ratio Ra to Re entered by the user and its total R _SUM Table showing T ₂ The standard production ratios Ra ′ to Re ′ obtained by correcting the standard production ratios Ra to Re so that the sum thereof becomes a predetermined size 180 in accordance with the number of frames L and the total R _SUM Table showing 'T ₃ Is a table for explaining a method of performing leveling calculation using the corrected reference production ratios Ra ′ to Re ′. ₃ The work unloading order data table T is created.
[0025]
That is, the leveling calculation program P ₁ First, table T ₁ The total R of the standard production ratio R entered by the user as shown in _SUM And this is calculated to be 219 in this example. And table T ₂ As shown in FIG. 4, a standard production ratio R ′ corrected based on the standard production ratio R is obtained. At this time, the total R of the standard production ratio R ′ _SUM In order to make the input size 180 as 'number of frames L', each of the reference production ratios Ra to Re is multiplied by the number of frames L (that is, 180 times in this example), and then the total R _SUM Divide by (that is, 219 in this example).
[0026]
The leveling calculation program P ₁ Table T using the corrected reference production ratio R ′ ₃ As shown in FIG. Table T ₃ Using the leveling calculation program P ₁ The operation of will be described.
[0027]
That is, in the calculation order 1, the reference production ratio R ′ is substituted. Then, after the calculation order 2, each of the reference production ratios Ra ′ to Re ′ is sequentially added to create accumulated data (step S). ₁ ). While continuing this accumulation sequentially, each accumulated value corresponding to each workpiece is given a certain constant (in this example, the total R of the standard production ratio R ′ _SUM ') And compare (step S ₂ ). For example, in the calculation order 3, the accumulated value corresponding to the work Wa is 186, and the total R _SUM It can be determined that the value is larger than 180 of ', and when such a condition is satisfied, the order of outputting the work Wa carry-out instruction is set, and the total R is calculated from the above numerical values. _SUM The value 180 of 'is subtracted (step S ₃ ).
[0028]
Step S is performed as described above. ₁ ~ S ₃ By sequentially repeating these processes, the order in which the workpiece unloading instruction is output can be determined. In the calculation of the calculation order 10, in the calculation related to the workpieces Wc and We, the respective numerical values are 210 and 194, and both are total R _SUM It can be determined that it becomes larger than 180 of '. When such a condition is met, the order of the workpiece unloading instruction is set in order from the top, and the workpiece unloading order is determined in the order of the workpiece Wc and the workpiece We. In such a case, the constant R _SUM Next step S until the unloading order for all workpieces larger than 'is determined. ₁ Is not performed.
[0029]
FIG. 4 shows the table T ₃ It is a figure which shows the carrying-out order data table T obtained by determining the carrying-out order of a workpiece | work with the method demonstrated in FIG. In FIG. 4, D is unloading order data for determining the unloading order of works in the unloading order data table T (in this example, since the number of frames L is 180, unloading order data D ₁ ~ D ₁₈₀ The numerical values 1, 2, 3, 4, and 5 indicated by the unloading order data D recorded in each frame number of the unloading order data table T correspond to the workpieces Wa, Wb, Wc, Wd, and We, respectively. ing. In addition, for each of the workpieces Wa to We, an unrestricted seat (thinning data) is set at an appropriate ratio r (in the example shown in FIG. 2, the ratio is set to 20% by the user). The carry-out order data D to be performed is marked by adding, for example, 100 as the thinning data set for this unreserved seat.
[0030]
Various methods can be considered to determine whether or not to add the thinned data. For example, each time the work discharge order is determined, the numerical value 20 of the ratio r is accumulated separately for each work. It is possible to determine whether or not to add thinned data by repeating the process of setting the thinned data when it exceeds 100 and subtracting 100. Furthermore, it is possible to generate an appropriate random number of, for example, 100 or less, and add thinned-out data when the value of the ratio r is, for example, 20 or less.
[0031]
According to the leveling calculation method, the calculation used to create the carry-out order data D is only simple four arithmetic calculations. ₃ Since the operations shown in the explanation are addition and subtraction of integers, an extremely simple operation may be performed. Therefore, the calculation function required for the calculation unit 9 may be minimal, and the configuration of the programmable controller 8 can be simplified accordingly. That is, it is not necessary to use a high-performance ratio assisting computer in order to control the production ratio of the workpiece production ratio control apparatus 1, and the production cost of the production line can be kept low.
[0032]
In addition, since the unloading order of the workpieces Wa to We can be reliably and evenly distributed, even if there are those that require a lot of time for manufacturing the workpieces Wa to We, it is as efficient as possible. Production can be done. In addition, the operator can arbitrarily change the reference production ratio R according to the situation at the site, and the calculation unit 9 side can create a carry-out order data table T corresponding to the new reference production ratio R. Thus, it is no longer necessary to create the carry-out order data by a worker who is familiar with the site as in the prior art.
[0033]
As described above, in the present example, when the carry-out order data table T having 180 frames is created, the leveling calculation is finished, and the carry-out instruction program P using the next created carry-out order data table T is used. ₂ Can output an instruction to carry out the workpieces Wa to We. In addition, when the unloading order data table T is created and the instructions for unloading the workpieces Wa to We are output as in this example, it is possible to confirm the unloading schedule of the workpiece only by confirming the contents of the data table T. There are advantages you can do.
[0034]
Next, referring to the carry-out order data table T shown in FIG. ₂ The operation of will be described. Although the carry-out data table T shown in this example shows a case where the number of frames L is 180, it goes without saying that the present invention does not limit the size L of the data table T. That is, in this example, the size L of the carry-out data table T is 180, but in reality, the maximum number of frames 200 can be handled, and the size determined by the user within the range up to 200. The number of L frames can be set freely.
[0035]
The carry-out data table T is stored in the memory 10 shown in FIG. 2 and has carry-out order data D corresponding to at least the carry-out order N. In this example, a mark ● indicating the work carry-out signals Ca to Ce of the respective works Wa to We and a mark ● indicating a place set in the thinning data are added.
[0036]
Therefore, the carry-out instruction program P ₂ Reads out the unloading data D recorded in the memory 10 in accordance with the unloading order N, thereby controlling the workpiece production ratio control device 1 to sequentially output the workpiece unloading signals Ca to Ce of the appropriate workpieces Wa to We. Can do. Also, the 180th frame unloading data D which is the final unloading sequence N ₁₈₀ Next, the first frame export data D ₁ Returning to, the export instruction is repeatedly output.
[0037]
Now, the unloading instruction program P ₂ For example, the unloading sequence data D of the unloading sequence 1 ₁ If the processing by ₁ Is 1, the carry-out instruction program P ₂ Outputs the workpiece carry-out signal Ca of the workpiece Wa to the previous stock line 2a via the output interface 14. And after the workpiece | work Wa conveyed to the processing machine 4 via the conveyor 3 is processed by the processing machine 4, the processed workpiece | work Wa is carried out to the test | inspection distribution device 5, and the conveyance completion signal Sf is output. .
[0038]
On the other hand, the calculation unit 9 carries out the carry-out instruction program P ₂ The transfer completion signal Sf is input through the input interface 13 by the transfer interface data D ₁ Finish the process. Then, the next carry-out order data D from the carry-out data table T ₂ Are sequentially output from the workpiece carry-out signals Ca to Ce.
[0039]
In addition, the calculation unit 9 sends the carry-out instruction program P ₂ For example, the 6th unloading sequence data D ₆ Is read out, carry-out order data D ₆ Is 101 and 100 or more, it can be known that this is thinned-out data. Also, carry-out order data D ₆ If 100 is subtracted from, it becomes 1, so that it can be known that the workpiece to be transported next is the workpiece Wa. In this case, the calculation unit 9 first outputs the ratio change limit switch La before outputting the workpiece carry-out signal Ca of the workpiece Wa. ₁ Are input from the input interface 13.
[0040]
And unloading instruction program P ₂ Is the limit switch La ₁ Is off, that is, when the number of workpieces Wa stored in the rear stock line 7a is small, a workpiece carry-out signal Ca is output and the limit switch La is output. ₁ Is turned on, it is programmed to perform a process of skipping the work Wa carry-out order by not outputting the work carry-out signal Ca. That is, the carry-out order data D set in the thinning data ₆ , D ₇ ,... Are processed, limit switches La of the rear stock lines 7a to 7e are processed. ₁ By confirming this state and skipping the workpiece carry-out signals Ca to Ce, the production ratio R of the workpieces Wa to We can be adjusted according to the number of workpieces stored.
[0041]
Further, the carry-out instruction program P ₂ The storage over limit switch La ₂ ~ Le ₂ Always monitor the status of all limit switches La ₂ ~ Le ₂ When is in the on state, the transfer of the workpieces Wa to We is programmed to be temporarily interrupted. By doing so, it is not possible to perform production such that the workpieces Wa to We cannot be stored in the rear stock lines 7a to 7e.
[0042]
By creating the carry-out data table T in advance as in this example, the user can confirm the leveling state of the carry-out order by checking the carry data table T. In addition, since the calculation unit 9 can automatically create the transport data table T that is surely leveled according to the production ratio R of the workpieces Wa to We, even when producing workpieces with different production tacts, It is possible to output the optimum workpiece carry-out signals Ca to Ce that do not cause variations in the above.
[0043]
FIG. 5 is a diagram showing another example for outputting the workpiece carry-out signals Ca to Ce using the programmable controller 8 according to the present invention shown in FIG. In this example shown below, members denoted by the same reference numerals as those in FIGS. 2 and 3 are the same or equivalent members.
[0044]
The proportional control program P ′ executed by the calculation unit 9 of the programmable controller 8 in this example is a leveling calculation program P that calculates the unloading order of the workpieces Wa to We using the reference production ratio R. ₁ 'And this leveling calculation program P ₁ Unloading instruction program P for outputting the workpiece unloading signals Ca to Ce in the order determined by ' ₂ 'And have.
[0045]
In this specification, the programmable controller 8 of this example that executes the proportional control program P ′ is illustrated in a form different from the programmable controller 8 shown in FIG. The configuration of 8 need not be changed by the proportional control programs P and P ′. That is, the two proportional control programs P and P ′ can be executed by the programmable controller 8 having the same configuration. In this embodiment, the proportional control programs P and P ′ can be selectively executed by the same programmable controller 8, and the user can select which proportional control program P and P ′ is used for control. Yes.
[0046]
Leveling calculation program P of this example ₁ 'Does not create the carry-out order data table T shown in FIG. ₂ The leveling calculation is performed at any time before the transfer instruction by ', and the leveling calculation shown in FIG. 2 is performed in that the leveling calculation is performed using the standard production ratio R of each workpiece inputted by the user as it is. This is different from the computerized calculation program P1.
[0047]
FIG. 6 shows the leveling calculation program P of this example. ₁ The method of leveling calculation by 'is shown. In FIG. ₃ 'Is a table for explaining a method of performing leveling calculation using the reference production ratios Ra to Re input by the user.
[0048]
That is, the leveling calculation program P ₁ 'First, table T ₁ As shown, the total Rsun of the reference production ratio R input by the user is calculated, and this is calculated to be 219 in this example. And the leveling calculation program P of the leveling method at any time of this example ₁ 'Is the table T using the standard production ratio R as it is. ₃ As shown in ', find out the workpiece unloading order.
[0049]
Note that the basic method of leveling calculation is as described in detail in the description corresponding to FIG. 3, and the detailed description thereof is omitted. In this example, when the accumulated value of the accumulated data corresponding to each workpiece Wa to We becomes larger than 219 which is the size of the total Rsun of the standard production ratio R, the workpiece corresponding to the accumulated data is displayed. On the other hand, the order of outputting the workpiece unloading instruction is used. In addition, in response to an instruction to carry out the workpieces Wa to We, unreserved seats with a ratio r determined by the user are set by an arbitrary method already described in detail.
[0050]
Next, a description will be given of a procedure for outputting the workpiece conveyance instructions Ca to Ce using the leveling method as needed.
[0051]
The leveling calculation program P ₁ The calculation by 'is performed in order from the calculation order 1, and in the calculation order 3, the unloading order for the workpiece Wa can be obtained. Here, the leveling calculation program P ₁ The leveling calculation by 'is temporarily interrupted, and then the transport instruction program P ₂ The workpiece conveyance instruction Ca is output to the workpiece Wa by '. In this specification, for the sake of easy understanding, the leveling calculation program P ₁ 'And transfer instruction program P ₂ Although 'is shown separately, it is needless to say that one program may be provided to perform leveling calculation and conveyance instruction as needed.
[0052]
Next, the calculation unit 9 carries out the carry-out instruction program P ₂ By inputting the transfer completion signal Sf through the input interface 13 by the above, the leveling calculation program P is again input. ₁ The leveling calculation by 'can be resumed and the calculation of calculation order 4 can be performed.
[0053]
The conveyance instruction program P ₂ 'Is the carry-out order data D set in the thinning-out data in response to the carry-out instruction set in the above-mentioned free seat. ₆ , D ₇ ..,..., And the limit switch La of the rear stock lines 7a to 7e. ₁ The production ratio R of the workpieces Wa to We is adjusted according to the number of stored workpieces by checking whether the workpiece unloading signals Ca to Ce are skipped.
[0054]
In addition, the conveyance instruction program P ₂ 'Is storage over limit switch La ₂ ~ Le ₂ Always monitor the status of all limit switches La ₂ ~ Le ₂ When is in the on state, the conveyance of the workpieces Wa to We is programmed to be temporarily interrupted. That is, it is not possible to perform production such that the workpieces Wa to We cannot be stored in the rear stock lines 7a to 7e.
[0055]
In this way, by performing the leveling calculation while outputting the workpiece transfer instructions Ca to Ce by the proportional control program P ′ of the present example, an accurate workpiece according to the reference production ratio R input by the user can be obtained. There is no need to calculate in advance the carry-out order data table T as shown in FIG. That is, it is possible to quickly cope with a change in the standard production ratio R by the user. That is, the user can change the standard production ratio R at an arbitrary time.
[0056]
In addition, as shown in FIG. 3, there is no need to make an adjustment for adjusting the standard production ratio R determined by the user to the size L of the carry-out order data table T, so there is a large difference in the standard production ratio R. Even if it is a case (for example, when the ratio is adjusted to 450: 2, it becomes 180: 0), it is possible to instruct to carry out the workpiece faithfully with the reference production ratio R input by the user. it can.
[0057]
【The invention's effect】
As described above, according to the present invention, by inputting the standard production ratio from the input unit, the user can arbitrarily change the standard of the production ratio of each group, and the production ratio of workpieces by the production line Can be adapted to the actual situation. In addition, since the proportional control program has a function to determine whether or not to skip the workpiece unloading order by inputting a detection signal from the specified amount detection means, the workpiece production ratio is reduced due to workpiece machining defects or artificial reasons. Even a slight change can be accommodated.
[0058]
Further, the proportional control program sequentially adds the following series of processing, that is, the numerical values of the standard production ratio, respectively, to create accumulated data corresponding to each stock line. On the other hand, when it becomes larger, it is in the order of outputting the work carry-out signal for the previous stock line corresponding to the accumulated data, and by repeating the process of subtracting the constant from the accumulated data, the work carry-out signal is sequentially outputted. If you have a leveling calculation program that determines the output order, you can determine the work delivery order so that the same work is not as continuous as possible by simple addition, subtraction, and numerical comparison. Even if only arithmetic processing can be performed, it is possible to perform leveling calculation that determines an accurate work delivery order.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of a workpiece production ratio control apparatus according to the present invention.
FIG. 2 is a block diagram showing a configuration of a programmable controller for controlling the workpiece production ratio control device.
FIG. 3 is an explanatory diagram showing an example of a data table type leveling calculation using the workpiece production ratio control apparatus;
FIG. 4 is a diagram showing an example of a carry-out order data table obtained by the leveling calculation.
FIG. 5 is a block diagram showing another example of a programmable controller that performs control using the workpiece production ratio control apparatus of the present invention.
FIG. 6 is an explanatory diagram showing an example of leveling calculation of the leveling method at any time in the example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Work production ratio control apparatus, 2a-2e ... Front stock line, 4 ... Processing machine, 7a-7e ... Rear stock line, 8 ... Programmable controller, 9 ... Calculation part, 10 ... Storage medium, 12 ... Input part, Ca to Ce: Work carry-out instruction, D (D ₁ ~ D ₁₈₀ ) ... Unloading order data, La ₁ ~ Le ₁ ... Prescribed amount detection means, La ₂ ~ Le ₂ ... Over storage detection means, P, P '... Proportional control program, r ... Ratio, R (Ra to Re), R' (Ra 'to Re') ... Standard production ratio, T ... Unloading order data table, Wa to We …work.

Claims (4)

A plurality of previous stock lines that are provided corresponding to a plurality of types of workpieces and carry out workpieces corresponding to workpiece delivery signals, a processing machine that processes workpieces that are carried out from the previous stock lines, and processed workpieces that are In production lines with multiple rear stock lines that are stored by type,
A plurality of specified amount detection means that are provided in each rear stock line and output a detection signal when the number of workpieces stored reaches a predetermined number, and a programmable controller that outputs a work carry-out signal to each front stock line Have
In order for this programmable controller to input the standard production ratio of each workpiece by the user, the production ratio of each workpiece is the input standard production ratio, and so that the workpieces are evenly stored in each rear stock line, Leveling calculation to determine the unloading order to output the workpiece unloading signal as appropriate, and input the detection signal from each specified amount detection means to determine whether to skip the unloading order of the workpiece and output the unloading signal A computer-readable storage medium storing a proportional control program for instructing to carry out a workpiece, and a calculation unit that executes the proportional control program,
The proportional control program has a leveling calculation program, and the leveling calculation program corrects the inputted standard production ratio so that the sum becomes a predetermined size, and then performs the leveling calculation to perform work. create the predetermined size of the carry-out order data table consisting of unloading the order data indicating the output order of the carry-out signal, so as to perform the leveling calculation data table method for adding thinned data at an appropriate ratio to the carry-out order data In addition, the proportional control program sequentially outputs workpiece unloading signals in accordance with the unloading order data table, while detecting the specified amount of the rear stock line corresponding to unloading order data to which thinning data is added. When the detection signal is input from the means, the process of skipping the output of the workpiece carry-out signal is performed.
The programmable controller can set the ratio at which the detection signal from each specified amount detection means is input so that the user can skip the workpiece unloading instruction, and the programmable controller can execute the calculation by the leveling calculation program A production ratio control device for a workpiece, characterized by comprising an input unit for making the workpiece.   Storage over detection means for detecting that the number of workpieces stored in each rear stock line is sufficient, and the proportional control program detects the detection signals of all storage over detection means provided in each rear stock line. The workpiece production ratio control apparatus according to claim 1, wherein the workpiece production ratio control device is programmed not to issue a workpiece carry-out instruction when inputting the input.   The proportional control program sequentially adds the following series of processes, that is, the numerical values of the standard production ratio, respectively, to create accumulated data corresponding to each stock line. When it becomes larger, the output order of the work carry-out signal for the previous stock line corresponding to the accumulated data is set, and the output order of the work carry-out signal is sequentially repeated by repeating the process of subtracting the constant from the accumulated data. The work production ratio control device according to claim 1, further comprising a leveling calculation program for determining   When the leveling calculation program is programmed to perform leveling calculation of the leveling method at any time to obtain the output order of the workpiece carry-out signal at any time, and the proportional control program outputs the workpiece carry-out signal The workpiece is subjected to processing for skipping the output of the workpiece carry-out signal when a detection signal is input from the specified amount detection means of the rear stock line corresponding to the previous stock line which issues the workpiece carry-out instruction at an appropriate ratio. The work production ratio control device according to claim 3, further comprising a carry-out instruction program.

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