JPH0440146B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a production ratio control device for workpieces in a production line, particularly for controlling the production ratio of workpieces supplied from a pre-process stock line to a post-process stock line via processing means. This invention relates to improvements in devices for controlling.

[Conventional technology] Background technology Conventionally, processes from processing component materials to produce various parts to supplying the various produced parts to an assembly section are performed continuously on a series of conveyance paths. BACKGROUND OF THE INVENTION Continuous production equipment is well known and is used, for example, in a vehicle assembly line in a factory to produce and supply the required number of parts of the required type for each assembly section.

Incidentally, in each assembly section on such an assembly line, the types and quantities of parts to be assembled into a vehicle are determined in advance. For this reason, the corresponding assembly section has the required types,
A plurality of stock lines are provided in which a number of parts are stocked one by one, and workers in the assembly section take out necessary types of parts one by one and supply them to the assembly line.

FIG. 7 shows such a production device for supplying parts, and this production device includes a plurality of pre-process stock lines 1 provided corresponding to various workpieces.
0A, 10B, the parts materials 100A', 100B' supplied from this pre-process stock line are processed into predetermined parts by the processing device 12, and the processed parts 100A, 100B are processed into respective post-processes provided for each part. They are sorted and stocked in sequence on stock lines 14A and 14B.

Therefore, this post-process stock line 14A, 1
4B, for example, in an assembly section adjacent to a vehicle assembly line, workers in the assembly section can access the post-process stock lines 14A,
It becomes possible to take out the necessary parts 100A and 100B from 14B and assemble them into the vehicle.

Here, as mentioned above, the types of parts 100A and 100B required on the assembly line,
The quantity is predetermined. Therefore, it is preferable that the respective post-process stock lines 14A, 14B store the corresponding various parts 100A, 100B in quantities corresponding to the required ratio.

For this reason, such a production device for supplying parts is provided with a production ratio control device 18 in which a standard production ratio of parts 100A and 100B is set in advance, and this production ratio control device 18 Parts input signals are sequentially output to each pre-process stock line 10A, 10B based on the standard production ratio.

When the input signal is output in this way, the input device 20 is activated and each stock line 10A is activated.
Alternatively, the parts material designated by the input signal from 10B is supplied to the processing device 12.

Therefore, in this production equipment, the various parts required on the assembly line are 100A, 10
0B will be produced at a ratio according to the required quantity and will be stored in the post-process stock lines 14A, 14B.

However, normally in such a production line, there are factors that fluctuate the production volume of parts, such as eliminating defective materials and defective products and replenishing reworked products on the processing line where the processing device 12 is installed. . For this reason, the pre-process stock line 10A,
Part materials 100A', 10 supplied from 10B
If the supply ratio of 0B' is fixed, there will be a problem that the quantity of either part 100A or 100B will be insufficient or increase in the post-process stock lines 14A, 14B, and in the worst case, the quantity of either part 100A or 100B will increase. There is a problem that the parts stock amount becomes zero.

In addition, even if the quantity ratio of various parts 100A and 100B required on the assembly line is set to be constant in the final total of the day, the parts 100A and 100B required by the assembly line side during the day , 100B often varies greatly.

In such a case, as mentioned above, the component materials 100 from the pre-process stock lines 10A and 10B
If the supply ratio of A' and 100B' is set constant, there is a problem that either 100A or 100B will be insufficient or increased for one of the parts.

For this reason, generally in such production equipment, each post-process stock line 14A, 14B is equipped with
Limit switches 22A and 22B are provided as prescribed amount detection means, and limit switches 24A and 24B are further provided as pool over detection means.

The limit switches 22A and 22B for detecting the specified amount are connected to the corresponding stock lines 14A and 1
When the stock amount of 4B parts reaches a predetermined amount,
A specified amount detection signal is output to the production ratio control device 18, and the pool over detection limit switches 24A and 24B similarly detect when the parts stock amount of each stock line 14A and 14B pools over. A signal is output to the production ratio control device 18.

The production ratio control device 18 has a ratio changing means, and the limit switch 2 for detecting the specified value.
parts 10 in each post-process stock line 14A and 14B based on signals from 2A and 22B.
The supply ratio of component materials 100A' and 100B' from pre-process stock lines 10A and 10B is switched and controlled so that the stock ratio of 0A and 100B is optimized.

By doing this, the post-process stock lines 14A and 14B are always filled with parts 100A at an optimal ratio, regardless of various parts production fluctuation factors.
and 100B will be stocked, so there will be no shortage or increase in certain parts. As a result, vehicles can be assembled smoothly on the assembly line using the parts 100A, 100B stored in the stock lines 14A, 14B.

Prior Art FIGS. 8 and 9 show the main parts of a conventional production ratio control device 18, and this conventional device has the following features:
A plurality of rotary cams 30, 32, 34, 36 are attached and fixed to the same rotating shaft 38, and this rotating shaft 38
The motor 40 is configured to constantly rotate one pitch at a time in one direction via a speed reducer 42.

And each of the rotary cams 30, 32, 3
Reference numerals 4 and 36 consist of a rotating disk and a plurality of pins P provided around it for operating limit switches, and these rotary cams 30, 32, 34, 3
Limit switches LS1, LS2, LS3, which are turned on by pin P, are on the rotation trajectory plane of pin P of 6.
LS4 is installed.

Figure 10 shows each of these limit switches LS1.
~Each rotary cam 30, 3 that turns on and off LS4
2, 34, and 36 are shown, and in the embodiment, each rotary cam is attached to a pin attachment station No. 2 at a position that divides the rotating disk into 30 equal parts in the direction of rotation, as shown in FIG. 1-30
are provided, and parts 100A and 100 are attached to desired positions on these stations N=1 to 30 by means of pins P.
Part material 100A' based on the material supply ratio of B,
Supply order data of 100B' is set.

And each of these rotary cams 30, 32, 3
Component material 100A',1 set on 4,36
The supply order data of 00B' is read out by limit switches LS1, LS2, LS3, and LS4 every time these rotary cams are driven one pitch rotation, and a parts input signal is output based on this read order data. It turns out.

Here, rotary cams 30, 32, 3
The pin setting ratios of pins 4 and 36 are set to 8:19:20:21, respectively, and this conventional device appropriately combines these rotary cams based on signals input from limit switches 22A, 22B and 24A, 24B, and controls the supply of the rotary cams. It is configured to output a component input signal according to the order data.

That is, in the state of the pattern in which the rotary cams 30 and 34 are combined, the parts materials 100A' and 100A' are produced according to the predetermined standard production ratio of 8:20.
The input order data for B′ has been set. Also,
In the state of the pattern in which the rotary cams 30 and 32 are combined, the supply order data of the component materials 100A' and 100B' is set based on a production ratio of 8:21. Also, rotary cams 30 and 3
6 is combined, the supply order data for the component materials 100A' and 100B' is set based on a production ratio of 8:19, contrary to the production ratio described above.

Figure 11 shows limit switches 22A and 22B.
24A and 24B, that is, the operation pattern of the conventional apparatus corresponding to the parts stock condition at the post-process stock lines 14A and 14B is shown.

As is clear from the figure, when the stock amounts of the parts 100A and 100B in the post-process stock lines 14A and 14B are well balanced, the production ratio control device 18 outputs the combination of patterns, that is, the rotary cams 30 and 34. According to the thus-instructed supply order data (standard production ratio A:B=8:20), component materials 100A' and 100B' are supplied from the pre-process stock lines 10A and 10B. As a result, parts 100A and 100B are continuously stored in a well-balanced state in post-process stock lines 14A and 14B.

In addition, post-process stock lines 14A and 14B
Component 100A for component 100B
If the stock amount is too large, the component materials 100A' and 100B' are fed according to the combination of patterns, that is, the feeding order data indicated by the rotary cams 30 and 36. put it here,
The production ratio of rotary cams 30 and 36 is A:B=
8:21, and from the above standard production ratio, parts material 1
The ratio of 00B' is increasing. Therefore, the ratio of the parts 100A and 100B stored in the post-process stock lines 14A and 14B is corrected so that it becomes the standard production ratio.

On the contrary, in the post-process stock lines 14A and 14B, 1 part is used for 100A of parts.
If the stock amount of 00B is too large, the combination of patterns, that is, the rotary cams 30, 32
The parts materials 100A' and 100B' are supplied in accordance with the supply order data indicated by . Here, the production ratio data indicated by the rotary cams 30, 32 is A:B=8:19, and the production ratio of the component material 100B' is somewhat lower than the standard production ratio. Therefore, the ratio of the parts 100A and 100B stored in the post-process stock lines 14A and 14B is corrected so that it becomes the standard production ratio.

In this way, this production ratio control device controls the parts materials 100A', 100A' and 100B to be supplied to the processing equipment based on the stock amount of the parts 100A and 100B in the post-process stock lines 14A and 14B.
The production ratio of 100B' is switched and controlled, and the parts 10 in the post-process stock lines 14A and 14B are
It is possible to always keep the stock amount of 0A and 100B at an appropriate value close to the standard setting ratio.

[Problems to be Solved by the Invention] However, such a conventional input vehicle determining device requires the rotary cams 30 and 34 for setting the standard input ratio based on the pattern, and also requires the rotary cams 30 and 34 for setting the standard input ratio based on the pattern. Since the rotary cams 32 and 36 for setting the production ratio are also required, there is a drawback that the entire device becomes extremely large.

In other words, in conventional equipment, one rotary cam is installed to determine the amount of input for one part based on the amount of input for this part. Then, there are multiple rotary cams with different parts input amounts corresponding to each of the other parts (one for setting the standard input ratio (pattern), one for increasing the ratio (pattern), and one for decreasing the ratio (pattern).
The production ratio can be adjusted by selecting a rotary cam.
Therefore, when supplying the two types of parts mentioned above, it is sufficient to provide only four rotary cams, but when three or more types of parts are supplied as shown in Fig. 10, the number of rotary cams becomes extremely large.
The problem was that the entire device was extremely large and expensive.

For example, if there are 10 types of parts, one rotary cam is required for the standard part, and three rotary cams are required for each of the other nine parts, for a total of 28 rotary cams. I get used to it.

Furthermore, as mentioned above, in such conventional devices, the number of rotary cams used is extremely large, so setting the position of the pin P provided on each rotary cam is extremely complicated, and as a result, it is difficult to set and change data. The disadvantage is that it requires a lot of time and effort.

Purpose of the Invention The present invention was made in view of such conventional problems, and its purpose is to reduce and streamline the amount of data for setting production ratios, and to
It is an object of the present invention to provide a production ratio control device for workpieces in a production line that can be easily changed and the entire device can be extremely miniaturized.

[Means for Solving the Problems] In order to achieve the above object, the apparatus of the present invention includes a plurality of pre-process stock lines that are provided corresponding to a plurality of workpieces and sequentially supply the corresponding workpieces based on a workpiece input signal. In a production line that includes processing means for processing the workpieces supplied from the pre-process stock line, and a plurality of post-process stock lines that store the processed workpieces separately, each post-process stock line is provided with a processing means for processing the workpieces supplied from the pre-process stock line. a plurality of specified amount detection means that outputs a detection signal when the stock amount of the workpiece reaches a predetermined specified amount, and a workpiece supply order that is determined according to a predetermined standard production ratio and controls the input order by specifying each workpiece one by one. data and
thinning data indicating whether or not to thin out the supplied workpieces set corresponding to the designation of each workpiece in the supply order data; and a workpiece information storage means in which thinning data is stored in advance; If the specified amount detection signal is not output from the means, a work input signal is output according to the workpiece supply order data, and if the specified amount detection signal for any of the processed workpieces is output from the specified amount detection means. includes an input work calculation means for thinning the corresponding workpieces based on the thinning data and outputting a workpiece input signal based on the supply order data of the thinned-out workpieces, and is capable of controlling the stock of processed workpieces in the post-process stock line. The feature is that the amount is automatically adjusted to a value below a specified amount.

[Operation] With the above configuration, when the stock amounts of various workpieces on the post-process stock line are well balanced, that is, when no detection signal is output from the specified amount detection means, the ratio information storage means stores The workpieces are sequentially fed to the processing means from the previous process stock line according to the workpiece feeding order data.

As a result, various processed workpieces are continuously supplied to the post-process stocking means so as to achieve a predetermined standard production ratio.

In addition, for some reason, the stock amount of various parts on the post-process stock line is unbalanced, and the specified amount detection means outputs a detection signal that detects that the stock amount of one of the processed workpieces has reached a predetermined specified amount. In this case, the corresponding workpieces are thinned out based on the thinning data from the workpiece supply order data, and various workpieces are sequentially sent to the processing means from the pre-process stock line based on the thinned-out workpiece supply order data. supply

As described above, according to the present invention, since the workpieces that have reached a predetermined amount are thinned out using the thinning data and supplied to the processing means, the ratio of the workpieces stored in the post-process stock line gradually decreases and The production ratio will be automatically corrected to the predetermined production ratio.

As described above, according to the present invention, it is possible to automatically input the workpieces and correct the production ratio based on the predetermined production ratio based on the workpiece supply order data and thinning data. Compared to conventional devices, the amount of data used is extremely small, making it possible to downsize the entire device and easily set and change data.

[Example] Next, a preferred example of the present invention will be described based on the drawings. Note that the same reference numerals are given to the members corresponding to those of the conventional device, and the explanation thereof will be omitted.

First Embodiment Production Apparatus for Supplying Parts FIG. 2 shows a production apparatus for supplying parts used in this embodiment. and 100C' are processed by the processing device 12 based on a predetermined production ratio to produce three types of parts 100A and 100B.
and 100C.

That is, the component materials 100A', 100B' and 100 transported by a predetermined transport line
C' is sorted by the sorter 50 and sequentially stored in the corresponding pre-process stock lines 10A, 10B and 10C.

When a work input signal is input from the production ratio control device 18 to the input device 20, the input device 20 transfers the component material instructed by the work input signal from the pre-process stock line 10 to the processing device 20.
Supply to 2.

At this time, the end of the supply operation of the component material to the processing device 12 is detected by the detection switch 52, and the production ratio control device 18 sends a new work input signal to the input device 2 every time a detection signal is input from the detection switch 52. Output to.

The processing device 12 processes the input component materials into desired parts, and the processed parts are sorted by type by a sorter 54 and sent to the corresponding post-process stock lines 14A, 14B, and 14.
The data are sequentially stored in C.

The parts 100A, 100B and 100C thus stored in the post-process stock lines 14A, 14B and 14C are transported by the loading device 56 toward the parts assembly section.

Production Ratio Control Device FIG. 1 shows a first preferred embodiment of the production ratio control device 18 of the present invention, which includes a ratio information storage means 60 and an input work calculation circuit 62.

The ratio information storage means 60 stores workpiece supply order data in which the supply order of each component material 100A', 100B', and 100C' is determined according to a predetermined standard production ratio, and data set in this workpiece supply order data. Thinning-out data for thinning out the supply of component materials that have been supplied are stored in advance.

A characteristic feature of the present invention is that by appropriately combining the work supply order data set in this way and the thinning data, various parts 10
The production ratio of 0A, 100B and 100C can be adjusted as necessary.

By doing so, according to the present invention,
The amount of data used is extremely small compared to conventional devices, and as a result, data can be stored with a small memory capacity, and each data can be set and changed extremely easily.

In this embodiment, this ratio information storage means 6
0 is formed using a plurality of rotary cams.

That is, in the embodiment, the ratio information storage means 60 stores each component material 100A', 100B' and 1
Three rotary cams 64A, 64B, and 64C to which the parts input order data of 00C' are set, and one rotary cam 6 to which the thinning data is set.
6, and each of these rotary cams 64A, 6
4B, 64C, and 66 are attached and fixed to a common rotating shaft 38, and are configured to be rotated one pitch at a time by a motor 40 via a decelerator 42.

In FIG. 3, each rotary cam 64A, 64
B, 64C and 66 configurations are shown, with mounting stations 1-30 for each of these rotary cams.
, pins P indicating supply order data and thinning data of the workpieces of various component materials are provided as appropriate.

FIG. 4 shows the work input data and thinning data set in this way.
Each piece of data is represented by a black circle corresponding to the station number of each rotary cam.

Then, by means of the pin P attached to each of these stations, the corresponding limit switch LS
1 to LS4 are driven and output this signal to the input work calculation circuit 62.

In the present invention, this input work calculation circuit 62
are limit switches 22A, 22B and 22C
Post-process stock line 14A, 1 based on the output of
The rotary cams 64A, 64B determine the stock status of parts in 4B and 14C and input from the ratio information storage means 60 based on the determination result.
and 64C, and the thinning data input from the rotary cam 66 are combined as appropriate. Then, a work input signal is outputted to the input device 20 so that the various parts 100A, 100B, and 100C are stocked in each of the post-process stock lines 14A, 14B, and 14C according to a predetermined production ratio.

That is, all limit switches 22A, 2
When the specified amount detection signal is not output from 2B and 22C, the post-process stock line 14A,
It is determined that the stock status of parts in 14B and 14C is an appropriate status according to a predetermined production ratio. In this case, each rotary cam 64
Work input signals are sequentially output in accordance with the supply order data of workpieces of various component materials set in A, 64B, and 64C.

In addition, either limit switch 22A, 2
When a specified amount detection signal is output from 2B and 22C, the ratio of the parts stock amount corresponding to this specified amount detection signal to other parts stock amounts is greater than a predetermined standard production ratio. Then, the work supply order data of the part concerned is combined with the thinning data to perform the thinning process.

Then, the input work calculation circuit 62 outputs the work input signal only according to the work supply order data for the parts for which the specified amount detection signal is not output, and for the parts for which the specified value detection signal is output, A work input signal is output in accordance with the thinned-out work supply order data.

For example, each rotary cam 64A, 64B, 64
When C and 66 are opposite the detection limit switches LS1 to LS4 at the station number NO = 1, limit switches LS1 and LS4 are turned on and the part material 100A' is input, as is clear from Fig. 4. A command is input to the input work calculation circuit 62.

At this time, if the ON signal, that is, the specified amount detection signal, is input from the limit switch 22A to the input work calculation circuit 62, the input work calculation circuit 62 determines that the stock amount of the component 100A in the post-process stock line 14A is the specified amount. It is determined that the above is the case, and it is determined whether thinning data is set in the station number NO1 of the rotary cam 66. At this time, limit switch LS4
Since is turned on, it is determined that thinned data is set. Then, even though LS1 is turned on, the input work calculation circuit 62 does not output any work input signal at station number NO=1, and drives the motor 40 to rotate each rotary cam by one pitch, thereby changing the station number. Set NO=2.

Also, the rotary cam is the station number.
When NO=2 is set, as is clear from Figure 4, the LS instructs to input the component material 100B'.
The ON signal No. 2 is input to the input work calculation circuit 62. At this time, limit switches 22A, 22
Despite the outputs of B and 22C, no on signal is input from the limit switch LS4 representing the thinning data, so the input work calculation circuit 62 unconditionally inputs a work input signal instructing the input of the component material 100B'. Output to the device 20.

Then, the component material 100 is loaded by the charging device 20.
When the detection switch 52 detects the completion of loading B', the loaded work calculating circuit 62 drives the motor 40 to rotate the rotary cam one pitch and set the station number to NO=3.

In this state of station number NO=3, the limit switch LS3 is turned on and the limit switch LS4 is turned off, so the input work calculation circuit 62 unconditionally outputs a work input signal instructing to input the component material 100C'.

By repeating these operations in sequence, when the station number of the rotary cam reaches the position of NO=5, the input workpiece calculation circuit 62 contains the component material 10.
The ON signal of limit switch LS2, which instructs the input of 0B', and the ON signal of LS4, which represents thinned-out data, are simultaneously input.

At this time, when the specified value detection signal is not output from the limit switch 22B, the input work calculation circuit 62 selects the part material 1 according to the ON signal of the limit switch LS2 regardless of the existence of thinning data.
Outputs a work input signal instructing input of 00B'.

Further, if the specified value detection signal is inputted from the limit switch 22B at this time, the input work calculation circuit 62 determines that the stock amount of the component 100B in the post-process stock line 14B exceeds the specified value. And limit switch LS4
The parts material 10 is input via the limit switch LS2 based on the thinning data input via the
Thin out the supply order data of the workpiece of 0B',
No work input signal is output.

In this way, according to the present invention, when no specified value detection signal is output from the limit switches 22A, 22B, and 22C, the predetermined reference production ratio input via the limit switches LS1, LS2, and LS3 is Work input signals for various component materials are sequentially outputted from the input work calculating circuit 62 based on the work supply order data based on the work supply order data.

Also, if the stock amount of any one of the post-process stock lines 14A, 14B, and 14C exceeds the specified value, this will cause the limit switches 22A, 22B to
and 22C, respectively.

Then, the production ratio control device 18 performs a thinning process by combining the supply order data of the workpieces of the component materials corresponding to the post-process stock line 14 that exceeds the specified value with the thinning data, and adjusts the input ratio of the component materials. The production ratio is lowered to a preset value, and the stock amount in the post-process stock line 14 is automatically controlled to be below the specified amount.

As described above, according to the present invention, it is possible to relatively increase or decrease the supply ratio of various component materials by appropriately combining the thinning data with the work supply order data of each component material and performing the thinning process. , post-process stock lines 14A, 14B
And it becomes possible to control the stock amount of various parts in 14C to an appropriate value.

In addition, such a post-process stock line 14
The width for absorbing fluctuations in component stock amount in A, 14B, and 14C can be adjusted as appropriate by the thinning data set in the rotary cam 66, that is, by the set number of pins P.

Further, as another method different from the present invention, for example, post-process stock lines 14A, 14B, and 14C
If it is determined that the stock amount of any part within the stock exceeds the specified value, the supply of component materials for that part will be completely stopped, and when the stock amount of the part falls below the specified value, the parts will be replaced. It may be possible to control the supply of materials to be resumed, but if this is done, there will be a time lag until the restarted part material reaches the post-process stock line as a part, resulting in stock parts being missing in the next process. There is a risk of damage.

However, in the present invention, in such a case, the work supply order data of the part material is simply thinned out based on the thinning data, and the supply ratio of the part material is reduced with respect to the preset production ratio. However, the supply of the parts and materials will continue. Therefore, there is no risk of stock parts being out of stock due to the time lag as described above.

Further, the input work calculation circuit 62 of this embodiment is
In addition to the basic operations described above, a limit switch 2 detects a pool over of parts in the post-process stock lines 14A, 14B, and 14C.
Also using detection signals from 4A, 24B and 24C,
It also outputs a more detailed work input signal.

That is, the input work calculation circuit 62 of the embodiment
determines that the post-process stock lines 14A, 14B, and 14C are full when pool over detection signals are output from all limit switches 24A, 24B, and 24C for pool over detection. Then, regardless of the input from the ratio information storage means 60, the work input signal is not output, and the input of component materials from the pre-process stock lines 10A, 10B, and 10C to the processing device 12 is temporarily stopped.

In addition, each of these limit switches 24A, 24
When the pool over detection signal output from any one of B and 24C turns off, the input work calculation circuit 62 receives the input from the limit switches 22A, 22B, and 22C and the ratio information storage means 60, as in the case described above. The output of the work input signal is restarted based on this.

Further, the input work calculation circuit 62 of the embodiment is configured to detect the limit switch 22A, 22B, and 22C when all of the limit switches 22A, 22B, and 22C output a specified value detection signal (in such a case, the line downstream from the post-process stock line 14 is stopped). ), the existence of thinned data is ignored and the limit switches 24A, 24 for pool over detection are set.
Work input signals are output until all of B and 24C output pool over detection signals.

By doing this, in the apparatus of the embodiment, the post-process stock lines 14A, 14B and 1
It becomes possible to appropriately control the stock amount of various parts within the 4C to a value below a specified value without causing an overflow.

Second Embodiment FIG. 5 shows a second preferred embodiment of the production ratio control device according to the present invention, and the feature of this embodiment is that the production ratio control device 18 is controlled by using a programmable controller. It's because it's configured.

In this embodiment, as a ratio information storage means.
A RAM 70 is provided, and an input work calculation section 72 is provided as input work calculation means. This RAM 70 and input work calculation section 72
corresponds to the ratio information storage means 60 and input work calculation circuit 62 of the first embodiment shown in FIG.

In the RAM 70, the work supply order data and thinning data shown in FIG. 4 are stored as numerical codes based on the following equation.

Ci=Ni+100M However, i... Station number N... 0 if there is no component material to be supplied, 1, 10 if the component material to be supplied is 100A'
It is set to 2 for 0B' and 3 for 100C'.

M: Set to 1 if a thinning day is set, and set to 0 if not set.

Therefore, as shown in FIG. 4, for example, the coded data with station number No=1 is i
=1, N=1, M=1, and its value is C ₁
= 101. Similarly, the coded data for station number N=2 is i=
2, N=2 and M=0, and the value is C ₂
=2.

Further, the input work calculation section 62 is connected to the limit switch 22 via an input interface 76.
The signals A, 22B, 22C, 24A, 24B, 24C and the detection switch 52 are input.

This input work calculating section 72 has an operation pattern shown in FIG. 6 in a ROM provided therein.
Data that is programmed in advance and stored in the RAM 70 is sequentially read out according to the station number. And input interface 7
Based on the signal inputted through the interface 7, a workpiece input signal is calculated in the same manner as in the first embodiment, and the calculated workpiece input signal is outputted to the interface 7.
8 and sequentially output to the input device 20.

In addition, FIG. 6A represents the supply pattern of the component materials 100A', and B represents the supply pattern of the component materials 100B', C.
represent the supply pattern of the component material 100C', respectively.

Here, the circle mark is part material 100A', 1
This means that the input signal is output according to the supply order data of 00B' and 100C'.

Further, * means that the following calculation operation is performed according to the outputs of the limit switches 22 and 24. That is, the limit switch 22A,
When all of 22B and 22C are turned on, the parts material 100A' according to the supply order data,
The input signals of 100B' and 100C' are outputted. Further, when all of the limit switches 24A, 24B, and 24C are turned on, the output of the closing signal is temporarily stopped until an off signal is output from one of the limit switches 22A, 22B, or 22C. In other cases, regardless of the reading of component material supply order data, the corresponding input signal is not output, and the data of the next station number is read.

Also, ** indicates limit switches 22A, 22
This means that the input signal is not output unless the ON signal is output from all of B and 22C at the same time, and the data of the next station number is read.

As is clear from the figure, the production ratio control device 18 of this embodiment sequentially outputs work input signals to the input device 20 in the same way as the device of the first embodiment, and as a result, the post-process stock is reduced. The stock condition within the lines 14A, 14B and 14C is always well controlled to an optimum condition.

In this embodiment, data is read from the RAM 70 in ascending order starting from the station number N=1, and when the station number reaches the maximum value, data is read sequentially from the station number N=1 again. be exposed.

Furthermore, since the device of this embodiment is formed using a programmable controller, the RAM7
It is possible to easily change data writing to 0 as necessary, and since the entire device is constructed using semiconductor elements, it is extremely small and lightweight compared to the first embodiment. becomes possible.

In addition, in the first and second embodiments,
In both cases, the present invention has been explained using an example in which the present invention is applied to a device that produces parts for vehicles, but the present invention is not limited to this, but is also effective for devices that produce other workpieces. Needless to say.

Further, in the above embodiment, the case where the stock amount of two or three different types of parts is controlled is explained as an example, but the present invention is not limited to this.
Even for three or more types of parts, the production ratio can be well controlled in accordance with the stock amount in the post-process stock line.

[Effects of the Invention] As explained above, according to the present invention, by using a combination of work supply order data and thinning data, it is possible to extremely reduce the amount of data used compared to conventional devices. As a result, data creation and changes can be easily made.
Moreover, the entire device can be made extremely small and simple.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a preferred first embodiment of the production ratio control device according to the present invention, FIG. 2 is an explanatory diagram of a parts production device formed using the device shown in FIG. 1, and FIG. 1 is an explanatory diagram of a rotary cam used in the apparatus shown in FIG. 1, FIG. 4 is an explanatory diagram of work supply order data and thinning data set in the apparatus shown in FIG. 1, and FIG. 5 is an explanatory diagram of a preferred embodiment of the present invention. FIG. 6 is an explanatory diagram showing the operation pattern of the apparatus shown in FIG. 5, FIG. 7 is an explanatory diagram showing the general configuration of the parts production apparatus, and FIGS.
Figure 10 is an explanatory diagram of a conventional production ratio setting control device.
The figure is an explanatory diagram showing the work supply order data and its correction data set in the conventional device shown in FIGS. 8 and 9, and FIG. 11 is an explanatory diagram showing the operation pattern of the conventional device shown in FIGS. 8 and 9. FIG. 10A, 10B, 10C...Pre-process stock line, 12...Processing device, 14A, 14B, 14C...
Post-process stock line, 18... Production ratio control device, 22A, 22B, 22C... Limit switch, 24A, 24B, 24C... Limit switch, 60... Ratio information storage means, 62... Input work calculation circuit, 100A', 100B', 100C' ...Parts material, 100A, 100B, 100C...Parts,
70...RAM, 72...Input work calculation section.

Claims (1)

[Scope of Claims] 1. A plurality of pre-process stock lines provided corresponding to a plurality of workpieces and sequentially supplying the corresponding workpieces based on a work input signal, and processing means for processing the workpieces supplied from the pre-process stock lines. , multiple post-process stock lines that store processed workpieces separately for each workpiece, and a production line that is installed in each post-process stock line and outputs a detection signal when the stock amount of processed workpieces reaches a predetermined amount. a plurality of specified quantity detection means for detecting a plurality of specified quantity, workpiece supply order data that is determined according to a predetermined standard production ratio and controls the input order by specifying each workpiece one by one, and designation of each workpiece in this supply order data. a workpiece information storage means in which thinning data indicating whether or not to perform thinning processing on the supplied workpieces set corresponding to the above is stored in advance; outputs a workpiece input signal according to the workpiece supply order data, and when a specified amount detection signal for any of the processed workpieces is output from the specified amount detection means, the corresponding workpiece is thinned out based on the thinning data. , an input workpiece calculating means for outputting a workpiece input signal based on the thinned-out workpiece supply order data, and automatically adjusts the stock amount of processed workpieces in the post-process stock line to a value equal to or less than a specified amount. A production ratio control device for input workpieces in wine production, characterized by: 2. In the apparatus according to claim 1, the workpiece information storage means includes a plurality of rotary cams corresponding to each workpiece to which workpiece supply order data is set, and one rotary cam to which thinning data is set; A workpiece production ratio control device in a production line, characterized in that data set on each rotary cam is output using a limit switch provided corresponding to each rotary cam. 3. The apparatus according to claim 1, wherein the workpiece information storage means and the input workpiece calculation means are formed using a programmable controller. 4. In the device according to any one of claims 1 to 3, the input work calculation means ignores the thinning data when the specified amount detection signal is output from all the specified amount detection means, and performs the feeding of the work. A workpiece production ratio control device in a production line, which outputs a workpiece input signal based only on order data. 5. In the apparatus according to any one of claims 1 to 4, the post-process stock line is provided with a plurality of pool over detection means for detecting work pool over, and the input work calculation means is configured to detect work pool overs. A workpiece production ratio control device in a production line, characterized in that outputting a workpiece input signal is stopped when all of the overage detection means output a poolover detection signal.