Multi-slot test fixture consumable parts life monitoring method and related equipment
By importing life information into the consumable parts monitoring platform of multi-slot test fixtures and using the test fixtures for real-time scanning and data interaction, real-time monitoring and automatic reminder of the number of consumable parts is achieved, solving the problem of inefficiency in traditional monitoring methods and improving the accuracy and production efficiency of monitoring.
Patent Information
- Application Number
- CN202411839919.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-04-08
AI Technical Summary
The traditional multi-slot test fixtures are inefficient in consumable parts monitoring methods, which are prone to omissions and misjudgments, resulting in excessive use of consumable parts, increasing the risk of test fixture failure and affecting the normal operation of the production line.
By importing the life information of various consumable parts into the consumable parts monitoring platform, controlling and testing fixtures on the production line to scan various consumable parts, obtain product information of various consumable parts, and interacting with the monitoring platform data to determine whether the number of times each consumable part is used exceeds the preset threshold. When the number of usage exceeds the threshold, a reminder email will be automatically sent to the operation and maintenance personnel.
It significantly improves the accuracy and real-time nature of consumable parts monitoring, reduces production line interruptions caused by monitoring errors, improves response speed, reduces overall production costs caused by consumable parts problems, and extends the service life of the fixture.
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Figure CN119784229A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of program design, and in particular to a method for monitoring the life of consumable parts of a multi-slot test fixture and related equipment. Background Art
[0002] In modern manufacturing, test fixtures are key tools for electronic product production and quality control. The durability of their wearing parts directly affects the test efficiency and reliability of the product. With the continuous development of technology and the improvement of automation, higher requirements are placed on the monitoring and management of fixture wearing parts. Traditional monitoring methods often rely on manual records and regular inspections. This method is not only inefficient, but also prone to omissions and misjudgments, resulting in overdue use of wearing parts, increasing the risk of test fixture failure, and affecting the normal operation of the production line. Therefore, realizing intelligent and automated monitoring and early warning systems for wearing parts life has become an important research direction in the field of industrial automation.
[0003] Traditional multi-slot test fixture consumable parts monitoring is achieved through regular maintenance, manual recording and other methods. Due to the large number of multi-slot test fixtures, the random loading of parts in each test slot, the wide variety of slot consumable parts, and the different life spans of each model, it is impossible to effectively replace them in real time through regular maintenance. As a result, it is difficult to monitor the life of multi-slot consumable parts. Some slot consumable parts are still in use after exceeding their maximum service life, which greatly increases the instability factor of the test, thereby increasing the test cost, wasting test resources, and affecting the normal delivery of products. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a method and related equipment for monitoring the life of consumable parts of a multi-slot test fixture, aiming to monitor the consumable parts in the multi-slot test fixture in real time, reduce the involvement of manual operation, and improve the accuracy and efficiency of monitoring.
[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for monitoring the life of consumable parts of a multi-slot test fixture, comprising:
[0006] Import the life information of various wearing parts into the wearing parts monitoring platform;
[0007] Control the test fixture on the production line to scan various vulnerable parts and obtain product information of various vulnerable parts;
[0008] The acquired product information of various consumable parts is exchanged with the consumable parts monitoring platform to determine whether the usage times of each consumable part exceeds the preset threshold;
[0009] When the usage count of a wearing part exceeds the preset usage count threshold, a reminder email is automatically sent to the operation and maintenance personnel.
[0010] Furthermore, after the life information of various wearing parts is imported into the wearing parts monitoring platform, it also includes:
[0011] The life information of wearing parts in different data formats is converted into a standard format and stored in the database.
[0012] Furthermore, when the number of times a consumable part is used exceeds a preset usage threshold, a reminder email is automatically sent to the operation and maintenance personnel, specifically including:
[0013] When the number of times a consumable part is used is less than the maximum service life, the number of times the consumable part is used is increased by 1, a warning message is returned, and a reminder email is pushed to the operation and maintenance personnel, and the test can be carried out normally;
[0014] When the number of times a consumable part has been used is greater than or equal to its maximum service life, an untestable message is returned and an email is sent to the operation and maintenance personnel to remind them to replace the consumable part.
[0015] Furthermore, when the number of times the wearing parts are used is less than the warning value, the number of times the wearing parts are used is increased by 1, returning to the normal value, and the test can be carried out normally.
[0016] The present invention also provides a multi-slot test fixture consumable parts life monitoring device, comprising:
[0017] Data import module, used to import the life information of various wearing parts into the wearing parts monitoring platform;
[0018] The scanning module is used to control the test fixture on the production line to scan various vulnerable parts and obtain product information of various vulnerable parts;
[0019] The data verification module is used to exchange the acquired product information of various wearing parts with the wearing parts monitoring platform to determine whether the number of times each wearing part is used exceeds a preset threshold;
[0020] The email sending module is used to automatically send a reminder email to the operation and maintenance personnel when the number of times a wearing part is used exceeds a preset usage threshold.
[0021] Furthermore, the multi-slot test fixture consumable parts life monitoring device also includes:
[0022] The format unification module is used to convert the life information of wearing parts in different data formats into a standard format and store it in the database.
[0023] Furthermore, the data verification module is specifically used for:
[0024] When the number of times a consumable part is used is less than the maximum service life, the number of times the consumable part is used is increased by 1, a warning message is returned, and a reminder email is pushed to the operation and maintenance personnel, and the test can be carried out normally;
[0025] When the number of times a consumable part has been used is greater than or equal to its maximum service life, an untestable message is returned and an email is sent to the operation and maintenance personnel to remind them to replace the consumable part.
[0026] Furthermore, the multi-slot test fixture consumable parts life monitoring device also includes: a normal value return module, which is used to increase the number of times the consumable parts are used by 1 when the number of times the consumable parts are used is less than the warning value, and return to the normal value so that normal testing can be carried out.
[0027] The present invention also provides a computer device, which includes a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the method for monitoring the life of consumable parts of a multi-slot test fixture as described in any one of the above items is implemented.
[0028] The present invention also provides a storage medium storing a computer program, which, when executed by a processor, can implement the method for monitoring the life of consumable parts of a multi-slot test fixture as described in any one of the above items.
[0029] The beneficial effects of the present invention are as follows: by importing the life information of various consumable parts into the consumable parts monitoring platform; controlling the test fixture on the production line to scan various consumable parts and obtain the product information of various consumable parts; exchanging data between the obtained product information of various consumable parts and the consumable parts monitoring platform to determine whether the number of times each consumable part has been used exceeds a preset threshold; when the number of times a consumable part has been used exceeds the preset usage threshold, a reminder email is automatically sent to the operation and maintenance personnel. This solution significantly improves the accuracy and real-time performance of consumable parts monitoring and reduces production line interruptions caused by monitoring errors. Through the intelligent early warning and email push mechanism, the response speed is improved and the overall production cost caused by consumable parts problems is reduced. Through the automated monitoring and early warning system, production efficiency and product quality are improved, and the market competitiveness of the enterprise is enhanced. Through data analysis and predictive maintenance, the occurrence of unexpected failures is reduced and the service life of the fixture is extended. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] The specific structure of the present invention is described in detail below with reference to the accompanying drawings.
[0031] Figure 1 This is a flow chart of a method for monitoring the life of consumable parts of a multi-slot test fixture according to an embodiment of the present invention;
[0032] Figure 2 A flow chart of another method for monitoring the life of consumable parts of a multi-slot test fixture according to an embodiment of the present invention;
[0033] Figure 3 This is a block diagram of a device for monitoring the life of consumable parts of a multi-slot test fixture according to an embodiment of the present invention;
[0034] Figure 4 A block diagram of another device for monitoring the life of consumable parts of a multi-slot test fixture according to an embodiment of the present invention;
[0035] Figure 5 The present invention is a schematic block diagram of a computer device according to a specific embodiment of the present invention. DETAILED DESCRIPTION
[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0037] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.
[0038] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.
[0039] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0040] like Figure 1 As shown, the first embodiment of the present invention is: a method for monitoring the life of consumable parts of a multi-slot test fixture, comprising the steps of:
[0041] S10. Import life information of various wearing parts into the wearing parts monitoring platform.
[0042] In this embodiment, through a user-friendly interface, the operation and maintenance personnel can manually import the life information of the wearing parts. The system automatically executes the data conversion algorithm and stores the converted standardized information in the database.
[0043] S20. Control the test fixture on the production line to scan various vulnerable parts to obtain product information of the various vulnerable parts.
[0044] In this embodiment, a QR code or RFID scanning module is integrated on the test fixture to automatically scan the identification code on the consumable parts, and the identification code information read by the scanning module is sent to the consumable parts monitoring platform.
[0045] S30: exchanging data between the acquired product information of various wearing parts and the wearing parts monitoring platform to determine whether the usage times of each wearing part exceeds a preset threshold.
[0046] In this embodiment, after receiving the identification code information, the wearing parts monitoring platform automatically matches it with the standard format information in the database, and updates the current usage count and status of the wearing parts.
[0047] S40. When the usage count of the wearing parts exceeds a preset usage count threshold, a reminder email is automatically sent to the operation and maintenance personnel.
[0048] In this embodiment, in the consumable parts monitoring platform, a preset usage threshold is set for each consumable part, including a maximum service life threshold and a warning threshold. The monitoring platform and the test fixture interact with each other in real time to ensure that the usage count of the consumable parts can be updated in real time.
[0049] like Figure 2 As shown, in a specific embodiment, after the life information of various consumable parts is imported into the consumable parts monitoring platform, it also includes:
[0050] The life information of wearing parts in different data formats is converted into a standard format and stored in the database.
[0051] In this embodiment, it is possible to identify and parse the life information of wearing parts in various data formats, including XML, JSON, and CSV. Through a data conversion algorithm, information in different formats is converted into a unified standardized format.
[0052] In a specific embodiment, the life information of consumable parts includes: fixture name, fixture ID, fixture location, fixture responsible person, email recipient, product to which the fixture belongs, consumable part position number, consumable part code, consumable part status, maximum number of uses, number of uses, warning value, and the latest update timestamp of component information.
[0053] In a specific embodiment, when the number of times a consumable part is used exceeds a preset number of times threshold, automatically sending a reminder email to the operation and maintenance personnel specifically includes:
[0054] When the number of times a consumable part is used is less than the maximum service life, the number of times the consumable part is used is increased by 1, a warning message is returned, and a reminder email is pushed to the operation and maintenance personnel, and the test can be carried out normally;
[0055] When the number of times a consumable part has been used is greater than or equal to its maximum service life, an untestable message is returned and an email is sent to the operation and maintenance personnel to remind them to replace the consumable part.
[0056] In a specific embodiment, when the number of times a wearing part is used is less than the warning value, the number of times the wearing part is used is increased by 1, returning to the normal value, and the test can be performed normally.
[0057] In a specific embodiment, setting the automatic sending of reminder emails specifically includes:
[0058] Email template design: Two email templates are designed, one is a warning email and the other is an untestable email. The email template contains specific information about the wearing parts and recommended actions.
[0059] Email sending mechanism: When the status of a consumable part changes, the system automatically sends the corresponding email according to the preset logic. For example, when the status of a consumable part changes to a warning or untestable, the system automatically sends an email to the mailbox of the operation and maintenance personnel.
[0060] Email Notification System: An email service is integrated to send reminder emails. The service can handle email sending failures and provide a retry mechanism.
[0061] In a specific embodiment, real-time updating and monitoring of wearing parts information specifically includes:
[0062] Real-time database update: Each time the test fixture scans the consumables and sends information to the monitoring platform, the monitoring platform will update the usage count and status of the consumables in the database in real time.
[0063] Monitoring interface design: A monitoring interface was developed so that maintenance personnel can view the usage and status of each wearing part in real time. The interface design takes user experience into consideration and provides an intuitive data display and operation interface.
[0064] Exception handling: The monitoring system is able to identify and handle abnormal situations, such as communication interruptions or data inconsistencies. In these cases, the system will log the abnormal event and automatically resume monitoring after the problem is resolved.
[0065] In a specific embodiment, the replacement and maintenance operations of wearing parts specifically include:
[0066] Replacement instruction: When the status of a wearing part becomes untestable, the system will generate a replacement instruction to inform the operation and maintenance personnel of the specific wearing part that needs to be replaced.
[0067] Maintenance records: After each replacement or maintenance operation of wearing parts, the operation and maintenance personnel need to record the operation results in the monitoring platform. The system will update the wearing parts information in the database, including the replacement date and the new number of times used.
[0068] Historical data analysis: The system supports the query and analysis of historical data. Operation and maintenance personnel can analyze the usage of wearing parts based on historical data to optimize replacement strategies and predict future maintenance needs.
[0069] The beneficial effects of the above embodiments are:
[0070] Improve production efficiency: Through automated monitoring of the life of wearing parts, the time and human resources consumed by manual inspection are reduced.
[0071] Reduce production risks: Timely reminder emails can reduce production interruptions or inaccurate test results caused by damaged wearing parts.
[0072] Improve test accuracy: Ensure that wearing parts are replaced in time within their service life, avoiding test errors caused by excessive wear.
[0073] Easy maintenance and management: Unified information management of wearing parts and standardized data format make the maintenance and management of wearing parts easier.
[0074] like Figure 3 As shown, the present invention also provides a multi-slot test fixture consumable parts life monitoring device, comprising:
[0075] The data import module 10 is used to import the life information of various wearing parts into the wearing parts monitoring platform;
[0076] The scanning module 20 is used to control the test fixture on the production line to scan various vulnerable parts and obtain product information of various vulnerable parts;
[0077] The data verification module 30 is used to exchange data between the acquired product information of various consumable parts and the consumable parts monitoring platform to determine whether the number of times each consumable part is used exceeds a preset threshold;
[0078] The email sending module 40 is used to automatically send a reminder email to the operation and maintenance personnel when the usage count of the wearing part exceeds a preset usage count threshold.
[0079] like Figure 4 As shown, in a specific embodiment, the multi-slot test fixture consumable parts life monitoring device also includes:
[0080] The format unification module is used to convert the life information of wearing parts in different data formats into a standard format and store it in the database.
[0081] In a specific embodiment, the data verification module 30 is specifically used for:
[0082] When the number of times a consumable part is used is less than the maximum service life, the number of times the consumable part is used is increased by 1, a warning message is returned, and a reminder email is pushed to the operation and maintenance personnel, and the test can be carried out normally;
[0083] When the number of times a consumable part has been used is greater than or equal to its maximum service life, an untestable message is returned and an email is sent to the operation and maintenance personnel to remind them to replace the consumable part.
[0084] In a specific embodiment, the multi-slot test fixture consumable parts life monitoring device also includes: a normal value return module, which is used to increase the number of times the consumable parts are used by 1 when the number of times the consumable parts are used is less than the warning value, and return to the normal value so that normal testing can be performed.
[0085] It should be noted that technicians in the relevant field can clearly understand that the specific implementation process of the above-mentioned multi-slot test fixture consumable parts life monitoring device can refer to the corresponding description in the aforementioned method embodiment, and for the convenience and brevity of description, it will not be repeated here.
[0086] The above-mentioned multi-slot test fixture consumable parts life monitoring device can be implemented in the form of a computer program. The computer program can be used in Figure 5 Runs on the computer device shown.
[0087] See also Figure 5 , Figure 5 5 is a schematic block diagram of a computer device provided in an embodiment of the present application. The computer device 500 may be a terminal or a server, wherein the terminal may be an electronic device with communication functions such as a smart phone, a tablet computer, a laptop computer, a desktop computer, a personal digital assistant, and a wearable device. The server may be an independent server or a server cluster composed of multiple servers.
[0088] See also Figure 5 The computer device 500 includes a processor 502 , a memory and a network interface 505 connected via a system bus 501 , wherein the memory may include a non-volatile storage medium 503 and an internal memory 504 .
[0089] The non-volatile storage medium 503 can store an operating system 5031 and a computer program 5032. The computer program 5032 includes program instructions, and when the program instructions are executed, the processor 502 can execute a method for monitoring the life of consumable parts of a multi-slot test fixture.
[0090] The processor 502 is used to provide computing and control capabilities to support the operation of the entire computer device 500 .
[0091] The internal memory 504 provides an environment for the operation of the computer program 5032 in the non-volatile storage medium 503. When the computer program 5032 is executed by the processor 502, the processor 502 can execute a method for monitoring the life of consumable parts of a multi-slot test fixture.
[0092] The network interface 505 is used to communicate with other devices over the network. Figure 5 The structure shown in the figure is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device 500 to which the solution of the present application is applied. The specific computer device 500 may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.
[0093] The processor 502 is used to run the computer program 5032 stored in the memory to implement the multi-slot test fixture consumable parts life monitoring method as described above.
[0094] It should be understood that in the embodiment of the present application, the processor 502 may be a central processing unit (CPU), and the processor 502 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.
[0095] It can be understood by those skilled in the art that all or part of the processes in the method for implementing the above embodiment can be completed by instructing the relevant hardware through a computer program. The computer program includes program instructions, and the computer program can be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the process steps of the embodiment of the above method.
[0096] Therefore, the present invention also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the multi-slot test fixture consumable parts life monitoring method as described above.
[0097] The storage medium may be a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk, etc., which are computer-readable storage media that can store program codes.
[0098] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.
[0099] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of each unit is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
[0100] The steps in the method of the embodiment of the present invention can be adjusted in order, combined and deleted according to actual needs. The units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs. In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
[0101] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, terminal, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention.
[0102] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.
Claims
1. A method for monitoring the life of consumable parts of a multi-slot test fixture, characterized in that: include: Import the life information of various wearing parts into the wearing parts monitoring platform; Control the test fixture on the production line to scan various vulnerable parts and obtain product information of various vulnerable parts; The acquired product information of various consumable parts is exchanged with the consumable parts monitoring platform to determine whether the usage times of each consumable part exceeds the preset threshold; When the usage count of a wearing part exceeds the preset usage count threshold, a reminder email is automatically sent to the operation and maintenance personnel.
2. The method for monitoring the life of consumable parts of a multi-slot test fixture according to claim 1, characterized in that: After importing the life information of various consumable parts into the consumable parts monitoring platform, it also includes: The life information of wearing parts in different data formats is converted into a standard format and stored in the database.
3. The method for monitoring the life of consumable parts of a multi-slot test fixture according to claim 1, characterized in that: When the number of times a consumable part is used exceeds the preset usage threshold, a reminder email is automatically sent to the operation and maintenance personnel, including: When the number of times a consumable part is used is less than the maximum service life, the number of times the consumable part is used is increased by 1, a warning message is returned, and a reminder email is pushed to the operation and maintenance personnel, and the test can be carried out normally; When the number of times a consumable part has been used is greater than or equal to its maximum service life, an untestable message is returned and an email is sent to the operation and maintenance personnel to remind them to replace the consumable part.
4. The method for monitoring the life of consumable parts of a multi-slot test fixture according to claim 1, characterized in that: Also includes: When the number of times the wearing parts are used is less than the warning value, the number of times the wearing parts are used is increased by 1, and the value returns to the normal value, and the test can be carried out normally.
5. A multi-slot test fixture consumable parts life monitoring device, characterized in that: include: Data import module, used to import the life information of various wearing parts into the wearing parts monitoring platform; The scanning module is used to control the test fixture on the production line to scan various vulnerable parts and obtain product information of various vulnerable parts; The data verification module is used to exchange the acquired product information of various wearing parts with the wearing parts monitoring platform to determine whether the number of times each wearing part is used exceeds a preset threshold; The email sending module is used to automatically send a reminder email to the operation and maintenance personnel when the number of times a wearing part is used exceeds a preset usage threshold.
6. The multi-slot test fixture consumable parts life monitoring device according to claim 5, characterized in that: Also includes: The format unification module is used to convert the life information of wearing parts in different data formats into a standard format and store it in the database.
7. The multi-slot test fixture consumable parts life monitoring device according to claim 5, characterized in that: The data verification module is specifically used for: When the number of times a consumable part is used is less than the maximum service life, the number of times the consumable part is used is increased by 1, a warning message is returned, and a reminder email is pushed to the operation and maintenance personnel, and the test can be carried out normally; When the number of times a consumable part has been used is greater than or equal to its maximum service life, an untestable message is returned and an email is sent to the operation and maintenance personnel to remind them to replace the consumable part.
8. The multi-slot test fixture consumable parts life monitoring device according to claim 5, characterized in that: Also includes: The normal value return module is used to return the normal value when the number of times the wearing parts are used is less than the warning value, and the number of times the wearing parts are used is increased by 1, and the test can be carried out normally.
9. A computer device, characterized in that: The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the multi-slot test fixture consumable parts life monitoring method according to any one of claims 1 to 4 when executing the computer program.
10. A storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the method for monitoring the life of consumable parts of a multi-slot test fixture according to any one of claims 1 to 4 can be implemented.