JPS5840238A - Control system of production line - Google Patents

Abstract

PURPOSE:To promptly and surely perform control work of an assembly line, by storing assembly order information to a buffer memory and writing the next work content from the buffer memory through a work end signal of each line. CONSTITUTION:A day's assembly order in each line is extended by a host computer 2 and stored to a file memory 10 in a terminal unit 6. Then the assembly order, adjusted by order change information of production program change and the like, is fed from the file memory 10 to a buffer memory 15, and stored. Information of a product, assembled first in each line 19-1-19-n, is output from the buffer memory 15 to a printer 21 through a character generator 17 and written to a printing tape 1. Detectors 23-1-23-n, detecting the product placed to line-off, are placed in the final end of the assembly lines 19-1-19-n, and information of the next product is output from the buffer memory 15 by an output of the detector 23.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control system for a production line that continuously assembles a wide variety of products such as automobiles.

Generally, this type of production line consists of a large number of assembly lines, and many types of products with large differences in the number of man-hours are produced on one conveyor line. Therefore, if the final assembly line and the unit line are not synchronized, and the unit line and the parts manufacturing process are not synchronized, the amount of work in progress will quickly increase, and conversely, the line will stop due to a shortage of necessary items.

For this reason, this type of production line has conventionally adopted a control system in which each line starts construction only after receiving an instruction to start construction. Conventional line control operations are based on production plans to ensure that the number of man-hours on each line is not unevenly distributed.
We draw up daily assembly sequence plans, incorporate information such as unexpected equipment failures, part abnormalities, or changes in production plans due to sales needs as sequence change information, and manually perform assembly sequences. This was done with a modification.

Specifically, according to the above assembly order on the instruction information printing device,
A production manager manually inputs the details of the work to be started for each machine for each line, and writes it out on a wide printing tape 1 as shown in FIG. This printed tape 1 is printed with information such as the management number, car number code, car number, number of tires, type of tensioner, etc. for each car, and this printed tape 1 is attached to the parts at the starting position of each line. The information was sent to each line to help line workers understand the work details.

However, the work of manually correcting the assembly order by incorporating order change information such as equipment failure is complicated and requires a lot of man-hours.
If a line worker misreads an entry due to omissions, errors, or incorrect characters in the input work of the printing device, the leveling of the man-hour load on each line is likely to be disrupted, and at the same time, synchronization may be difficult. Occasionally, situations could arise.

The present invention solves the above problems, and uses a conventional instruction information printing device to more reliably and quickly perform line control operations for controlling each line so that they are synchronized with each other, with fewer man-hours. The purpose is to provide a production line control method that can be used to

The present invention relates to a processing device that is connected to a host computer that determines production lines for a large number of assembly lines and that controls each assembly order of the assembly lines, and an assembly order that is connected to this processing device and that is transmitted from the host computer. There is a file memory that stores information, a rough memory that temporarily stores the work to be started based on the instructions from the processing device, and a rough memory that automatically records when a product is placed on the line at the end of each assembly line. A detector for detecting, a means for automatically capturing the detection information of this detector, a character generator for transmitting the contents of the work to be started stored in the above-mentioned Notnotsufa memory as a character signal, and each of the above-mentioned assembly lines. A printing device is placed at the starting position and receives the character signal from this character generator and prints out the characters, and when the detection information of the detector is received from the above-mentioned importing means, it is stored in the above-mentioned notnotsufa memory. The present invention is characterized by comprising a control processing device that causes the character generator to transmit the content of the work to the printing device as a character signal.

The present invention will be explained in detail below based on examples.

9. FIG. 2 is a configuration diagram of a production line control device according to an embodiment of the present invention. In Fig. 2, 2 is a host computer, and in order to optimize the man-hour load of the entire production line, the man-hour load of each line is determined based on the number of vehicles and delivery date based on the monthly production plan. By simulating this, the production turn that equalizes the man-hour load on each line is determined. This host computer 2 connects to a distributed processing terminal 6 via an output interface 3 and a modem 5.
connected to.

This distributed processing terminal 6 includes a modem 7 connected to the modem 5, a processing device 9 connected to the modem 7 for controlling the assembly order of a large number of assembly lines, and a host connected to the processing device 9. A file memory 10 that stores information sent from the computer 2 and this processing device 9
and a workstation 11 for displaying the operation contents of the processing device 9 and for instructing the operation of the processing device 9.

A control processing device 14 of a printing device control section 13 is connected to the processing device 9 of the distributed processing terminal 6.

This control processing device 141C is connected to a nozzle memory 15 that temporarily stores the contents of work to be started for each line according to instructions from the processing device 9. Also, the control processing device 1
A character generator 17 is connected to the character generator 4 and the display memory 15. The control processing device 14 detects a line-off signal input via an input interface 18, which will be described later, and performs control to transfer instruction contents from stored information to the character generator 17.

19 is the final assembly line, and the line flows from left to right as shown by the arrow by a conveyor. This assembly line 1
A printing device 21 is arranged at the start position of each line 9. The output of the character generator 17 is connected to the input of the printing device 21 via the output interface 22 of the printing device control section 13 . This printing system [2
1 writes the characters shown in FIG. 3 on the printing tape 1' based on the character generator 170 character signal. This printing device 21
receives character signals for one machine, writes the character signals on the printing tape 1', and then stops.

Further, at each line end of the assembly line 19, a detector 23 is arranged to automatically detect when a product has been taken off the line. The detection output of this detector 23 is connected to the control processing device 14 via the input ink of the printing device control section 13 and the face 18 .

To explain the operation of this embodiment with such a configuration, first, the assembly order plan for each line for one day developed in the host computer 2 is stored in the file memory of the distributed processing terminal 6 through the operation of the workstation 11. 10.

Next, if there is order change information such as a change in production plan due to equipment failure or sales needs, the confirmed order information is adjusted to change the order to the optimal order at that time by operating the workstation 11. The processing device 9 (which can temporarily store the contents of instructions for up to 10 machines per line) is sent out every month. If there is no order change information, assembly order information previously stored in the file memory 10 is sent from the processing device 9 to the notifier memory 15.

In the memory 15 of this printing device control section 13,
Instruction information is stored in the order of instructions for the printing device 21 of each line and is waiting for transmission.

When the line-off detection signal from the detector 23 is given to the control processing device 14 via the input interface 18, the control processing device 14 detects one unit of the corresponding assembly line 19 in the nosofa memory 15. The information is sent to the character generator 17 to generate characters, and the output interface 2
The instruction information is outputted to the printing device 21 of the corresponding line 19 through the channel No. 2.

Now, for example, if one product on the assembly line 19-8 comes off the line, the detection signal from the detector 23-1 is taken into the control processing device 14 via the input interface 18, and the control processing device 14 Optimum assembly order information for one VC on the assembly line 19-1 in the A-rough memory 15 is sent to the character generator 17. As a result, the printing device 21- installed at the starting position of the assembly line 19-8 from the character generator 17
A character signal for one machine is transmitted to 1 via the output interface 22, and instructions for starting work based on the optimum assembly order are automatically written on a wide printing tape 1'.

Note that the confirmed order information instructed by the processing device 9 is stored in the file memory IO as a completion record, and is aggregated and sent to the host computer 2 at the end of one day's worth of work.

In addition, although the final assembly line was described in the above example to simplify the explanation, the production line is not limited to the final assembly line, and as shown in Figure 4, the control of each assembly line in a multi-stage production line can be done overall. That is, by installing the device of this embodiment on all assembly lines, when one vehicle named rAJ comes off the assembly line F2, the first process of the F2 line is instructed to start construction of pewter jA+nI, and the frame assembly is started. It is controlled to take over the completed frame rBJ on line PK. (Here n
means the depth of the process. ) Similarly, when the frame rBJ comes off the line on the PK line, the start of the [+n2Jth construction is instructed for this first process, and the frame part rOJ
Furthermore, the FO line, which is a hole-drilling line for frame assembly, is also controlled so that a construction start instruction is issued each time the PK line takes over the next one.

Φ As described above, according to the present invention, assembly order information with a leveled man-hour load is automatically transmitted to the printing device placed at the start position of each assembly line, and printing tapes with the same pattern as conventional ones are printed. By printing and writing out the work details, (a) each line will be able to produce in synchronization and the amount of work in progress can be kept to the bare minimum. It has great effects and can be done quickly.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the printing state of a printing tape used in a conventional production line. FIG. 2 is a configuration diagram of a production line control device according to an embodiment of the present invention. FIG. 3 is a diagram showing the printing state of the printing tape written by the printing device of the control device. FIG. 4 is a diagram showing a production line of another embodiment. 1.1'...Print tape, 2...Host computer, 3...Output interface, 5...Modem, 6
...Distributed processing terminal, 7...Modem, 9...Processing device, 10...File memory, 11...Workstation ζ13-M device control unit, 14...Control processing device , 15... ζ buffer memory, 17... Character generator, 18... Input interface, 19...
Assembly line, 21...Printing device, 22...Output interface, 23...Detector. Patent Applicant Hino Motors Co., Ltd. Agent Patent Attorney Nao Takashi Ide Figure 1 Figure 2 Figure 35! I

Claims (1)

[Claims] (1) A processing device that is connected to a host computer that determines production patterns for a large number of assembly lines and controls each assembly order of the assembly lines, and a processing device that is connected to this processing device and stores assembly order information sent from the host computer. A file memo 9 to be processed, a memory that temporarily stores the contents of the work to be started based on the instructions from the processing device, and a memory that automatically detects when a product is rolled off the line at the end of each assembly line. a means for automatically importing the detection information of the detector; a character generator for transmitting the contents of the work to be started stored in the above-mentioned Nono Sofa memory as a character signal; and each of the above-mentioned assembly lines. A printing device is placed at the start position and receives the character signal from this character generator, and when the detection information of the detector is received from the printing device and the above-mentioned importing means, it is stored in the above-mentioned Schiff memory. A control system for a production line, comprising a control processing device that causes the character generator to transmit work content as a character signal to the printing device.