JPH0876853A - Cutting length correcting method for electric wire - Google Patents

Abstract

PURPOSE: To reduce the cutting length error of an electric wire and to extremely reduce the fraction defective of products. CONSTITUTION: The actually measured length of an electric wire is stored in a memory for every production condition, and the data on the work conditions are read out of the memory by a management computer 6 in response to a transmission request. When plural actually measured length data obtained under the production conditions requested for transmission are stored, these length data are extracted and the instructed length is outputted after the production condition has been corrected by operation of the least square, and the production conditions including the corrected instructed length data are sent to a control means 2 that requested the transmission of the length data. Therefore, the conventional input mistake of production condition can be prevented, and no expertness is required for a worker unlike a conventional case when the instructed length is corrected. Furthermore, it is possible to cause no calculation mistake, to reduce the cutting length error of the electric wire, and to extremely reduce the fraction defective of products.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire cutting length correction method for correcting an error between an indicated length and an actually measured length when measuring the length of the electric wire and cutting the electric wire to a predetermined indicated length. .

[0002]

2. Description of the Related Art Conventionally, as an apparatus for measuring the length of an electric wire and cutting the electric wire into a predetermined designated length, for example, Japanese Patent Laid-Open No. 4-2
In this type of device, as shown in FIG. 4, condition data is input to the control means 2 every time the preparation conditions such as the type and size of the electric wire are changed by the input means 1 such as a keyboard. Then, under the control of the control means 2, the measurement cutting means 3 cuts the electric wire so as to have the set instructed length.

However, the actual length (actually measured length) of the cut electric wire has an error with respect to the indicated length due to various factors, and in order to guarantee the quality of the product, the tolerance according to the indicated length ( If the measured length of the electric wire cut by the measurement cutting means 3 does not fall within the tolerance with respect to the specified length, the allowable error) is predetermined and is discarded as a defective product.

At this time, the operator calculates the error between the measured length of the electric wire and the designated length, further calculates the difference between the designated length and this error, and uses this as the corrected designated length as input means 1
Is input to the control means 2 and a new electric wire is cut based on the corrected instruction length.

By the way, the following factors can be considered as factors of the above-mentioned error.

Firstly, the first factor is the difference in the type and size (cross-sectional area) of the electric wire.

That is, in general, a maker of a wire harness for automobiles or OA equipment uses several tens of kinds of electric wires, and these electric wires are variously processed. At this time, the measuring cutting means 3 is shown in FIG. In the case of a configuration using such rollers, the instruction length L that is command data given to the servo motor control unit 1, the reduction ratio of the speed reducer K is K, and the number of output pulses of the encoder 8 that detects the rotation of the servo motor 7 Is N (PPR), and the radius of the measuring roller 9 around which the electric wire W is wound about half a round is r, a rotation command signal S1 proportional to L1 / (2πr / N · K) from the servo motor control unit 5 to the servo motor 7. Is output, and this rotation command signal S
Based on 1, the electric wire W has an indicated length L1 (= 2πr · S1 / N
The wire should have a radius R (Fig. 5).
The electric wire W is cut to a length L2 (= 2πR · S1 / N · K) determined by (see).

Therefore, the measured length L2 of the cut electric wire W
And the designated length L1, the difference ΔL (= 2π ·
A cutting length error of S1 (R−r) / N · K) occurs, and this error ΔL can be theoretically obtained depending on the type and diameter of the wire, but strictly speaking, it is the same type and wire of the same diameter. Also, the expansion / contraction rate of the electric wire W changes depending on the rotation speed of the measuring roller 9 and the ambient environment (temperature, humidity) conditions that change depending on the season, the region, etc., and these factors also cause the error ΔL.

Next, as the second factor, the measuring roller 9
The dimensional accuracy and the dimensional change due to friction, the backlash of the speed reducer 6, and the like, and the variation of each part of the device and the secular change can be mentioned.

Then, in consideration of an error caused by such a factor, the operator inputs the data obtained by adding the empirical correction to the instructed length for each preparation condition by the input means 1.

[0011]

However, when the creation conditions are changed several tens of times a day in the same device, it takes a long time to operate the input means 1 for each change, and the amount of data to be input is huge. Since it is a large amount, it is easy to cause an input error, and since the correction value is calculated by artificial calculation, it takes skill to determine the correction amount, and it is easy to make a calculation error and also to reduce the defective rate of the product. There is a limit, and there is a problem that it adversely affects both the productivity and the quality of a wire of a predetermined length.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and an object thereof is to reduce an error in the cutting length of an electric wire and to significantly reduce the defective rate. .

[0013]

According to the first aspect of the present invention,
Input means for inputting data and the like, measurement cutting means for cutting the electric wire to measure the cutting length thereof, and control for controlling the measurement cutting means based on the data input and set by operating the input means In a method for correcting a cut length of an electric wire for correcting an indicated length when an electric wire is cut by an electric wire measuring / cutting device including a means, a plurality of preparation conditions including combinations of different kinds of wires, sizes, indicated lengths, etc. Data in advance is stored in a storage device, and the measured length of the electric wire obtained by actual measurement of the measurement cutting means and input by operation of the input means is stored in the storage device for each of the creation conditions. The data of the working condition corresponding to the transmission request from the control means is read from the storage device by the arithmetic processing device, and the measured length data obtained under the creation condition requested to be transmitted When a plurality of accumulated lengths are accumulated, the measured length data is extracted from the storage device by the arithmetic processing unit to derive a corrected instruction length of the preparation condition by the calculation of the least squares method, and the correction is performed. It is characterized in that the creation condition including the subsequent instruction length data is transmitted to the control means that has requested the transmission.

Further, as described in claim 3, input means for input operation of data and the like, measurement cutting means for cutting the electric wire to measure the cutting length thereof, and input and setting by operation of the input means. A plurality of electric wire measuring and cutting devices provided with control means for controlling the measuring and cutting means on the basis of the obtained data are provided, and a main controller for management and each of the control means are connected via a communication line to connect different electric wires. Data of a plurality of creation conditions consisting of combinations of types, sizes, designated lengths, etc. is stored in advance in a storage device, and the electric wires are actually measured by the measurement / cutting means and input by operating the input means. The length is stored in the storage device for each of the creation conditions, and the data of the creation conditions corresponding to the transmission request from the control unit is read from the storage device by the main control device,
When a plurality of the actually measured length data obtained under the creation condition requested to be transmitted are accumulated, the main controller extracts these actually measured length data from the storage device and uses the least squares method. It is also effective to derive a corrected instruction length of the creation condition by calculation and to send the creation condition including the corrected instruction length data to the control unit that requested the transmission.

[0015]

According to the present invention, the measured length of the electric wire is stored in the storage device for each production condition, the data of the production condition corresponding to the transmission request is read from the storage device by the arithmetic processing device, and the transmission request is made. When a plurality of measured length data obtained under the created conditions are accumulated, the arithmetic processing device extracts these measured length data and corrects the created conditions by the calculation of the least squares method. Derive the indicated length,
Since the creation condition including the corrected instruction length data is transmitted to the control means, the input error of the creation condition as in the past is prevented, and the optimum corrected instruction length is automatically calculated. It is possible to reduce the error in the cutting length of the electric wire and significantly reduce the defective rate without such a calculation error.

According to a third aspect of the present invention, the control means of the plurality of electric wire measuring and cutting devices are connected to the main control device by a communication line, and the preparation condition corresponding to the transmission request from any one of the control means is stored in the storage device. It is possible to set the required creation conditions for each of the plurality of wire measuring and cutting devices without error by reading the data from the device and transmitting it to the control means.

[0017]

1 is a flow chart for explaining the operation of an embodiment of the present invention, FIG. 2 is a block diagram showing the overall schematic configuration,
FIG. 3 is a schematic view of a part.

First, the structure of the entire system will be described. As shown in FIG. 2, the input means 1 including a keyboard and the like for inputting data relating to an instruction length for cutting the electric wire and the electric wire are cut. A plurality of electric wire measuring / cutting devices 5a, 5b, each of which is constituted by a measuring / cutting means 3 for actually measuring the cutting length and a control means 2 for controlling the measuring / cutting means 3 based on the data inputted by the input means 1.
Are provided to connect the management computer 6 which is the main control device for management and each control means 2 via the communication line 7.

By the way, the management computer 6 has a built-in memory as a storage device, and in this memory, data of a plurality of preparation conditions consisting of combinations of different electric wire types, sizes, designated lengths, etc. are stored in advance. When a transmission request for the necessary preparation conditions is transmitted from any of the control means 2 to the management computer 6 and is received by the management computer 6, the management computer 6 responds to the code requested by the control means 2. The data of the creation condition to be read is read from the memory, and the read data of the creation condition is transmitted to the control means 2 which requested the transmission via the communication line 7.

A code is assigned to each production condition in advance, and every time the production condition is changed by the operation of the input means 1, the code of the production condition to be requested next is input and the input code is corresponded to. Management condition 6
To the control means 2 by operating the input means 1 to previously register the change timing of the creation condition and the codes of each creation condition before and after the change, and the control means 2 judges whether the change time has come. The management computer 6 is requested to send a creation condition corresponding to the code of the creation condition to be changed.

Then, according to the preparation conditions transmitted from the management computer 6, the control means 2 causes the measurement cutting means 3 to operate.
Is controlled so that the wire is cut to the specified length, but the actual cut length deviates from the specified length due to the various factors mentioned above.Therefore, there is an error between the measured length of the wire and the indicated length. It is necessary to correct the indicated length in order to minimize the above. Therefore, the measured length of the electric wire, which is obtained by the actual measurement of the measuring and cutting means 3 and is input by the operator's operation of the input means 1, is set by the control means 2. The data is transmitted to the management computer 6 via the management computer 6 and stored in a memory for each creation condition. In this way, the measured length data obtained under the creation condition requested to be sent is stored in the memory as n1 (where n1 is When a total of 2 or more natural numbers) have been stored, these measured length data are extracted from the memory by the management computer 6, and the instruction length after correction of the creation condition requested to be transmitted is calculated by the least squares method. Guide , And transmits the derived creation conditions including the instruction length data corrected transmission request to the control unit 2.

At this time, the actually measured length data are, for example, as shown in Table 1, in the order in which they are generated under the condition of preparing the range of wire type, size, and cut length for each wire measuring and cutting device 5a, 5b, .... The time-series data is stored and accumulated in the memory for each creation condition.

[0023]

[Table 1]

The measured length data thus accumulated and the designated length data in the pre-registered preparation conditions are respectively stored in the electric wire measuring and cutting devices 5a and 5a as shown in FIG.
The measured data file FJ and the instruction data file FS, which are separately formed, are stored for each category for the type, size (cross-sectional area), and cut length of the electric wire.

Next, the correction process of the designated length will be described with reference to FIG.
This will be described with reference to the flowchart of FIG.

Now, when it is necessary to change the preparation conditions in any of the electric wire measuring and cutting devices, the control means 2 sends a request for transmitting the necessary preparation conditions to the management computer 6 (step S1), and the management computer 6 is sent. When this request is received, the management computer 6 retrieves the requested creation condition from the instruction data file FS in the memory (step S2).

Then, the management computer 6 searches the measured data file FJ of the electric wire measuring and cutting device, which is the request source, on the basis of the created conditions searched (step S3).
If the designated length and the actually measured length in the corresponding cutting length range are obtained, and the accumulated number n1 of data of the obtained actually measured lengths exceeds a predetermined number n (<n1), the latest n actually measured lengths are obtained. If the data is extracted and (n1-n) past data is deleted, and the accumulated number n1 of the measured length data is less than or equal to a predetermined number n (≧ n1), the latest n1 measured lengths Data is extracted (step S4).

Next, the management computer 6 derives the corrected instruction length by the least square method based on the extracted measured length data. That is, this correction value is obtained by the general formula represented by Formula 1, the coefficients a and b in Formula 1 are represented by Formula 2 and Formula 3, respectively, and the coefficients a and b are calculated by the formulas 2 and 3, respectively. The instruction length x obtained by optimally correcting the instruction length y of the newly created creation condition that is obtained is derived (step S5). However, in Equations 2 and 3, n1 indicates the number of pieces of data of the extracted actual measurement length, x ′ indicates the designated length, and y ′ indicates the actual measurement length.

[0029]

[Equation 1]

[0030]

[Equation 2]

[0031]

(Equation 3)

Then, the preparation condition including the corrected instruction length data obtained in step S5 is transmitted to the requesting control means 3 (step S6), and the series of instruction length correction processing ends.

Therefore, when the creation condition is changed, the creation condition is automatically transmitted from the management computer 6 to the control means 2 which has requested the transmission, so that it is possible to prevent the conventional input error of the creation condition. Further, since the optimum corrected instruction length is automatically calculated, it is possible to reduce the error in the cutting length of the electric wire without requiring skill in determining the correction value as in the conventional technique and without causing a calculation error. Therefore, the defective rate of the product can be significantly reduced.

Further, the control means 2 of each of the electric wire measuring and cutting devices 5a, ... Is connected to the management computer 6 by the communication line 7, and the preparation condition according to the request from any one of the control means 2 is read out from the memory and its control is performed. By transmitting to the means 2, it becomes possible to set the necessary preparation conditions for each electric wire measuring and cutting device 5a ,.

In the case of one electric wire measuring and cutting device,
Similar to the above-described embodiment, data of a plurality of creation conditions, which are combinations of different types of electric wires, sizes, designated lengths, etc., are stored in advance in the built-in memory of the management computer 6 as a storage device, and cut by the measurement cutting means. The measured length of the electric wire is input by the operation of the input means 1, the measured length of the electric wire is stored in the memory for each preparation condition, and the data of the preparation condition according to the transmission request from the control means 2 is calculated. When a plurality of actually measured length data obtained by reading out by the management computer 6 which is a processing device and obtained under the creation condition requested to be transmitted are accumulated, the actually measured length data is extracted from the memory by the management computer 6. Then, the corrected instruction length of this production condition is derived by the calculation of the least squares method, and the production condition including the corrected instruction length data is transmitted to the control means that requested transmission. Even Unishi, it is possible to practice the present invention, it is possible to obtain the same effects as described above.

The storage device is not limited to the built-in memory of the management computer, but may be an external memory.

[0037]

As described above, according to the first aspect of the invention, the measured length of the electric wire is stored in the storage device for each preparation condition, and the measured length obtained under the preparation condition requested to be transmitted. When multiple data are stored,
To extract the measured length data and derive the corrected instruction length of the creation condition by the calculation of the least squares method, and to send the creation condition including the corrected instruction length data to the control means, It is possible to prevent the generation of mistakes in creating conditions as in the past, and to automatically calculate the optimal corrected instruction length, so it does not require skill to determine the correction value as in the past, and moreover there are no calculation errors. It is possible to reduce the cutting length error of the electric wire without causing it, it is possible to significantly reduce the defective rate of the product, and it is possible to reduce the burden on the operator much more than before. Moreover, the skill of the operator is not required.

Further, as described in claim 3, the control means of the plurality of electric wire measuring and cutting devices are connected to the main control device by a communication line, and the preparation condition according to the transmission request from any one of the control means is stored in the storage device. It is possible to set the required creation conditions for each of the plurality of wire measuring and cutting devices without error by reading the data from the device and transmitting it to the control means. For example, a wire consisting of the plurality of wire measuring and cutting devices in a factory. The measurement and cutting system can be operated smoothly.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining the operation of an embodiment of the present invention.

FIG. 2 is a block diagram showing an overall schematic configuration of one embodiment.

FIG. 3 is a schematic diagram of a portion of one embodiment.

FIG. 4 is a block diagram of a conventional example.

FIG. 5 is a schematic view of part of a conventional example.

[Explanation of symbols]

 1 Input Means 2 Control Means 3 Measuring / Cutting Means 5a, 5b Electric Wire Measuring / Cutting Equipment 6 Management Computer 7 Communication Wires

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area // B65H 61/00 H01B 13/00 513 Z

Claims (4)

[Claims] 1. An input means for inputting data and the like, a measurement cutting means for cutting an electric wire to measure the cut length thereof, and a measurement cutting based on data input and set by operating the input means. In the method for correcting the cutting length of an electric wire for correcting the indicated length when cutting the electric wire by means of the electric wire measuring and cutting device equipped with the control means for controlling the means, from the combination of different kinds of wires, sizes, indicated lengths, etc. Data of a plurality of forming conditions are stored in a storage device in advance, and the measured length of the electric wire obtained by the actual measurement of the measuring and cutting means and input by the operation of the input means is stored for each of the creating conditions. The data obtained by storing the data of the working condition in accordance with the transmission request from the control means from the storage device by the arithmetic processing device and obtained under the creation condition requested to be transmitted. When a plurality of length measurement data are accumulated, the measured length data is extracted from the storage device by the arithmetic processing unit and the designated length after correction of the creation condition is calculated by the least square method. A method for correcting the cutting length of an electric wire, which comprises deriving and transmitting the creation condition including the corrected instruction length data to the control unit that has made a transmission request. 2. The method according to claim 1, wherein the storage device is built in the arithmetic processing unit. 3. Input means for inputting data and the like, measurement cutting means for cutting an electric wire to measure the cut length thereof, and measurement cutting based on data input and set by operating the input means. A plurality of electric wire measuring and cutting devices provided with control means for controlling the means are provided, and the main control device for management and each of the control means are connected via a communication line, and the types, sizes and designated lengths of different electric wires, etc. Data of a plurality of production conditions consisting of a combination of the above is stored in advance in a storage device, and the actually measured length of the electric wire obtained by the actual measurement of the measurement / cutting means and input by the operation of the input means is set for each of the production conditions. In the storage device, the data of the creation condition corresponding to the transmission request from the control means is read from the storage device by the main control device, and the actual data obtained under the creation condition requested to be transmitted. When a plurality of length measurement data are accumulated, the main control unit extracts these actually measured length data from the storage unit and calculates the indicated length after correction of the creation condition by the calculation of the least squares method. A method for correcting the cutting length of an electric wire, which comprises deriving and transmitting the preparation condition including the corrected instruction length data to the control unit that has requested transmission. 4. The method according to claim 3, wherein the storage device is built in the main control device.