JP2971539B2 - production management system - Google Patents

Description

The present invention relates to a production management system suitable for use in, for example, a production line for painting a body of an automobile.

2. Description of the Related Art In a line for painting a body of an automobile, usually, a large number of models of the body are mixed, and the designation of a painting color is also various. Therefore, it is necessary for the operator to perform an operation corresponding to the model and the designated color on each body. Therefore,
An identification card or the like in which a code indicating the model of the body, a designated color, or the like is written is attached to a body or a transfer hanger flowing in a line, and a worker performs a predetermined operation by visually checking the identification card.

[Problems to be solved by the invention] However, in a conventional painting line using an identification card, it is necessary to determine what kind of body and how many bodies are in which process, or in which process the inserted body is currently. There was a problem that it was not possible to collectively grasp and work management became difficult. For example, when the number of body flows in a certain process on the painting line is extremely small, some sort of failure has occurred in that process.In a conventional painting line, such a situation can be grasped quickly. I couldn't.

The present invention has been made in view of the above-described circumstances, and is capable of intensively grasping information such as where a workpiece is located on a production line or how many bodies flow in each process. Accordingly, an object of the present invention is to provide a production management system capable of managing production speed and the like, finding an abnormality, and responding to a failure quickly.

[Means for Solving the Problems] In the invention described in claim 1, as shown in FIG. 1 (a), a plurality of workpieces b placed in the input section a are transported to the sending section c. Transport means d, one or a plurality of detecting means k provided in a transport path from the input section a to the sending section c and detecting passage of the transport means d,
The identification code e attached to each of the transporting means d, the reading means f for reading the identification code of the transporting means d at the loading section a, and the information on the workpiece b placed at the loading section a are input. An input means g, and a storage for storing a set of the identification code e read by the reading means f and the information inputted to the input means g each time the workpiece b is placed on the transport means d. Means h, having a plurality of storage areas connected continuously indicating the position of the transport means, inputting the identification code e read by the reading means to the first storage area,
The input identification code e is sequentially shifted toward the last storage area as long as there is a free storage area, and the transmission section c
And a register means i for discharging the identification code of the transport means d from the storage area at the last stage when the workpiece b is sent from the transport means d. When a section is divided into a plurality of sections and an identification code is input to the first-stage storage area of each section, the section sequentially shifts to the next-stage storage area as long as there is an empty area, and the detection means k detects passage of the transport means d. Then, the identification code e in the last-stage storage area of the preceding section of the corresponding boundary is shifted to the first-stage storage area of the next section.

In the invention according to claim 2, a plurality of transporting means d for transporting the workpiece b placed in the input section a to the sending-out section c, and an identification code e attached to each of the transporting means. ,
A reading unit f for reading the identification code e of the conveying unit d at the input unit a, and a plurality of storage areas connected in cascade, and the identification code e read by the reading unit f is input to the first storage area. Then, the input identification code e is sequentially shifted toward the last storage area as long as there is a free storage area, and when the work is sent from the transfer means in the sending section, the identification of the transfer means d is performed. A register block i for discharging the code from the last storage area, a plurality of transport blocks m provided in cascade, and a preceding transport block m
Transfer means n for placing the workpiece b delivered from the feeding section d in the loading section a of the subsequent transport block m, and the workpiece b loaded in the loading section a of the first transport block m
Means for inputting information relating to the first stage transport block m, the identification code e read by the reading means f of the first stage transport block m each time the workpiece b is placed on the transport means d of the first stage transport block m, and the input means g, a storage means h for storing the information inputted as a set, and a work piece b by the transfer means n.
Is transferred, the workpiece b in the storage means h
Rewriting means o for rewriting the identification code e related to the identification code e read by the reading means f of the subsequent transport block m
And

According to the third aspect of the present invention, the identification code is set in the transfer means n, and the rewriting means o performs the processing in the storage means h while the work b is in the transfer means d. The identification code e for the object is rewritten to the identification code of the transfer means, and after the transfer of the workpiece is completed, the identification code e is read by the reading means f of the subsequent transport block m.

According to the fourth aspect of the invention, the register means i is configured in the same manner as in the second aspect.

According to the fifth aspect of the invention, after the workpiece b is delivered from the delivery section c, the transport means d returns to the loading section a and circulates again.

[Operation] The identification code e of the transport means d on which the workpiece b is placed and the information of the workpiece b are stored as a set in the storage means h and input to the register means i. The identification code e is tracked according to the transport of the workpiece d. Therefore, by referring to the identification code e in the register means i and the contents stored in the storage means h, it is possible to know the information on the workpiece b and its location.

Further, in the invention according to claim 4, the conveying means d
Register means i corresponding to the detecting means k for detecting the passage of
Are divided into sections, so that the position of each transport means can be recognized in detail in section units.

According to the invention described in claim 2, when the workpiece b is transferred between the transport blocks m, the workpiece b in the storage means h
The rewriting means o rewrites the identification code e with the identification code e of the new transport means after transfer. Therefore, even if the workpiece b is successively transferred to a subsequent block in a line in which a large number of transport blocks m are provided in cascade, the storage content of the storage means h is the same as the identification code of the transport means at the latest point in time. Correctly show the correspondence with the object.

According to the third aspect of the present invention, the identification code is set in the transfer means n. Then, when the workpiece b is transferred between the transport blocks m, while the workpiece b is in the transfer means n, the storage means h relating to the workpiece b
Is rewritten to the identification code of the transfer means n. As a result, it is possible to recognize which transfer means n the workpiece is being transferred even during the transfer. Further, since the identification code of the transfer means n is known in advance, it is recognized whether or not the workpiece b is being transferred by looking at the identification code written in the storage means h. be able to.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

A: Configuration of the Example Schematic of Production Line in Example FIG. 2 is a schematic configuration diagram showing a coating line in one example of the present invention. The steps of this coating line will be described below.

After being temporarily stored in the welding stock shop, the body B is placed on a hanger conveyor (see FIG. 4) and transported to the pre-processing section 1. Here, when the pretreatment is performed, the electrodeposition coating is performed through the steps of the electrodeposition unit 2 and the electrodeposition furnace 3. Next, a sealing process is performed on the joint portion of the iron plate by the sealer 4, and a process is performed on the lower portion of the floor by the undercoat portion 5. Then, it reaches the inspection unit 7 via the sealer furnace 6,
Here, the inspection of the electrodeposition coating is performed. After passing through the inspection unit 7, the intermediate coating process is performed through the intermediate coating unit 8 and the intermediate coating furnace 9. After the intermediate coating process, it reaches the inspection unit 11 via the color alignment storage 10,
Inspect the middle coat. Next, painting of the indicated color is performed in the overcoating section 12. Then, baking is performed in the top coating furnace 14, whereby the top coating process is completed. Various inspections are performed on the body B, on which the top coating has been completed, in the inspection section 15, and the coating B reaches the wax processing section 19 through the coating stock shop 18.
Here, wax is applied. The waxed body reaches the painting stockyard 20. In the paint stocking areas 18 and 20, rearrangement is performed to efficiently pay out the bodies B in the next step (car assembly line). In the vehicle assembly process, since the work in each process differs depending on the type of vehicle, destination, and options, high efficiency is required for the permutation of the bodies flowing through the line. Therefore, sorting is performed in the coating stock sites 18 and 20 in accordance with this request. In addition, rearrangement work is performed at the painting stock sites 18, 20
The reason is that the rearrangement cannot be performed in one place. The body B paid out from the paint stocking place 20 is temporarily reserved at the car set stocking place 21 and then shifts to a car set up process. The car stocking area 21 is 10
Approximately 0 bodies can be stored, and it is a buffer for the payout body. By providing the buffer function in this manner, it is possible to increase the parts procurement time in the assembly process or to cope with a change in the processing amount in the assembly process.

In addition, electrodeposition night 22, sealer night 23, middle coating night
24 and the topcoat night 25 are orbits each configured to circulate the body, and are used at night or the like.
In the painting process, if the body stays in one place for a long time, a defective product is generated, so it is necessary to constantly move the body. Therefore, when the regular line is stopped at night or the like, the body is cut off from the normal line, enters the above-mentioned nights 22 to 25, and circulates in the same night.

Next, FIG. 3 is a block diagram showing a control system of this embodiment. In the figure, 30, 31, 32 and 33 are body B
Conveyor, which is provided in a charging step, a hand step, an automation step, and a dispensing step, respectively. The charging process is a process from “T1-ON” shown in FIG. 2 to a position before the pre-processing unit 1, and the hand process is an inspection unit.
7,11,15, and the automation process means sealer 4, undercoat 5, middle coat 8, top coat 12, and wax treatment section 19.
Etc., and the payout process refers to the coating stock space 20.
In FIG. 3, the input process, the hand process, the automation process, and the payout process are simply arranged serially for the sake of simplicity of explanation, but actually, the hand process and the automation process are alternately arranged as appropriate. Have been.

A large number of hangers 35 shown in FIG. 4 are attached to each of the hanger conveyors 30 to 33. The hanger 35 circulates in each of the hanger conveyors 30 to 33. A hanger plate 36 is attached to the hanger 35, and the hanger plate 36 is provided with eight windows as shown in FIG. These eight windows are weighted as "1", "2", "4", "8"..., And a predetermined identification code is determined according to whether the windows are open or closed. (Hereinafter referred to as hanger number). The hanger number is
The same value is not set because it is unique to the hanger.
The hanger number is read by a hanger reader 40 shown in FIG. The hanger reader 40 is provided at the loading section of each of the hanger conveyors 30 to 33 and at a predetermined position (described later), detects the tip of the hanger plate 36 by the photoelectric tube 41 as shown in FIG. Examine the opening of the window.

The travel of the hanger conveyors 30, 31, 32, 33 shown in FIG. 3 is controlled by conveyor control panels 50, 51, 52, 53, respectively. In the loading step, a card reader 55 is provided to read data from the magnetic card 56. The magnetic card 56 stores various information (hereinafter referred to as body information) regarding painting and assembly of the body B, and the magnetic card 56 is transported together with the body B to a painting process. The printer 57 prints out the body information read by the card reader 55 so that the operator can visually check the body information. 58a is a transfer device for mounting the body on the hanger 35 of the hanger conveyor 30.When the body is mounted by the transfer device 58a, the magnetic card 56 is inserted into the card reader 55 by the operator. It has become. 58b to 58d are transfer devices for transferring a body between hanger conveyors, and 58e.
Is a transfer device for transferring the body to the next step.

The body information read from the card reader 55 described above is transferred to the host computer 60. Reference numeral 61 denotes a file for storing data used by the host computer 60, processing data, and the like. The host computer 60 communicates with a computer (personal computer) 64 via modems 62 and 63. The computer 64 performs data communication with the sequencer 70, and furthermore, the sequencer 70
71, the sequencer 71 performs data communication with the sequencer 72, and the sequencer 72 performs data communication with the sequencer 73.

Computers 65 to 67 shown in FIG. 3 are respectively a sequencer 70 to 73 and a LAN (local area network).
Is composed. Any one of the computers 65 to 67 has the same information to back up the sequencers 70 to 73.

The sequencers 70 to 73 exchange data with the conveyor control boards 50 to 53, respectively, and have a shift register 80 shown in FIG. This shift register
At the first stage of 80, the hanger number read by the hanger reader 40 in the loading section of each of the hanger conveyors 30 to 33 is input.

Further, the hanger conveyors 30 to 33 are provided with limit switches LS for detecting passage of the hanger 35 at predetermined intervals, and the storage area of the shift register 80 is partitioned corresponding to each limit switch LS. (See FIG. 6). In this case, the sequencers 70 to 73 recognize the section divided by the limit switch LS as a zone, recognize the entire section of the shift register 80 as a block, and further recognize the position of each storage area of the shift register 80 as a position. It is supposed to. Shift register 80
Is a so-called first shift type, and when a hanger number is supplied to the first stage, the hanger number is sequentially shifted to the next stage as long as there is an empty area. However, the shift beyond the zone is performed only when the passage of the hanger 35 is detected by the limit switch LS. That is, when the passage of the hanger is detected by the limit switch LS, the hanger number in the last storage area of the zone before the boundary corresponding to the limit switch LS is shifted to the first storage area of the next zone. (Details of the operation will be described later).

79 shown in FIG. 3 is under the control of the conveyor control panel 51,
This is a display for performing various displays to the operator who works in the hand process. Reference numerals 81 and 82 denote a card reader and a printer, respectively, which have the same functions as the card reader 55 and the printer 57 described above. The body information read by the card reader 81 is transferred to the vehicle assembly line, which is the next step. This is because, in the vehicle assembly line, the parts to be prepared differ depending on the type of the body, so that it is necessary to know at an early stage which body flows in which order.

Next, robots 90, 91 and 92 perform various automatic operations in the automation process, and are controlled by robot control panels 93, 94 and 95, respectively. The stage master panel 96 transfers a job number and a painting color number (in the case of a painting robot) as appropriate to each of the robot control boards 93, 94, and 95.
Here, the job number is a code that specifies the operation of the robots 90, 91, and 92, and the paint color number is a code that indicates the paint to be applied by the painting robot. The stage master boards 96 and 98 transfer job numbers and the like to robot control boards (not shown) of other stages. The job number and the paint number are transferred from the model distribution board 100 to the line master board 99, and the line master board 99 distributes and transfers these to the stage master boards 96 to 98. When receiving the body information from the conveyor control panel 52, the model distribution panel 100 converts this into a job number and a paint number by referring to an internal table, and transfers the job number and the paint number to the line master panel 99. The operation until the body information is output from the conveyor control panel 52 will be described later.

In the above configuration, the sequencers 70 to 73 and the personal computer 64 to
67 and end 68 are installed together in the central control room. The terminal 68 displays management data such as the work volume and the number of process flows transferred from the management computer 67.

B: Operation of Embodiment Next, the operation of this embodiment having the above-described configuration will be described with reference to FIG.

Tracking of Hanger Number First, the body is placed on the hanger 35 at the loading section of the hanger conveyor 30 by the transfer device 58a from the welding stock site shown in FIG. At this time, the operator inserts the magnetic card 56 of the body into the card reader 55. As a result, the body information is transferred to the host computer 60, and further transferred to the computer 64 via the modems 62 and 63. On the other hand, the hanger reader 40 (see FIG. 4) provided at the loading section of the hanger conveyor 30 reads the hanger number from the hanger plate 36 and transfers it to the sequencer 70. The sequencer 70 writes the transferred hanger number in the first-stage storage area of the first zone of the register 80, and transfers it to the computer 64. When the hanger number is supplied, the computer 64 stores the hanger number in combination with the body information in an internal memory. As a result, the relationship between the body and the hanger on which it is placed is stored as data. Thereafter, the body B is moved to the hanger 35 by the transfer device 58a.
The above-described processing is performed each time the data is transferred to the computer 64, whereby the internal memory of the computer 64 stores the correspondence between the inserted body and the hanger number. here,
The hanger number read by the hanger reader 40 is
For example, if the computer 64
Correspondence as shown in FIG. 7 is stored in the internal memory. In the figure, M indicates an internal memory,
A1, A2... Indicate the storage areas. For example, the storage area A1 stores body information indicating that the domestic body, the vehicle type is A, and the color is red,
The hanger number of the hanger on which this body is mounted is stored.

On the other hand, the shift register 80 in the sequencer 70 performs the following processing. First, as shown in FIG. 8 (a), the hanger number is input to the first-stage storage area. This hanger number is sequentially shifted to the subsequent stage, and reaches the last stage of the zone (see FIG. 2B). Next, when the hanger number is input, it shifts to the subsequent stage in the same manner as described above, and is stored in the storage area immediately before the last stage of the zone (see FIG. 3C). As described above, the hanger number input to the shift register 80 is sequentially shifted to the subsequent stage as long as there is an empty area. However, no shift beyond the zone is performed in the above case. And the hanger 35 of the number moves, and the first limit switch LS
When the passage is detected, the detection signal of the limit switch LS is transferred to the sequencer 70. As a result, the sequencer 70 shifts the hanger number to the first-stage storage area of the next zone as shown in FIG. The hanger number thus shifted is sequentially shifted to the subsequent stage in the next zone. Also, in the previous zone, the hanger number,..., Is shifted to the subsequent stage by one stage since the last stage storage area becomes empty.

Next, the transport of the body B proceeds, and the hanger conveyor
A case where the data is transferred from 30 to the hanger conveyor 31 will be described. For example, when the hanger of the hanger number reaches the delivery section of the hanger conveyor 30, the body is moved to the transfer device 58.
transferred to b. At this time, the hanger number is stored in the last storage area of the shift register 80, but the shift register 80 discards the hanger number with the transfer of the body B. Therefore, the shift register
Each hanger number in 80 is shifted by one step toward the next step.

An identification number is set in advance in the transfer device 58b, and this identification number is assigned to the sequencer 70 or the computer 64.
Is stored within. Then, when the body B is transferred, a signal indicating the transfer is supplied to the computer 64 via the sequencer 70, whereby the computer 64 stores the hanger number in the storage area A1 shown in FIG.
Rewrite with the identification number of For example, the identification number is "100"
Would be rewritten to "100".
Next, the body B is transferred from the transfer device 58b to the hanger conveyor 31.
Is transferred to the hanger 35 in the loading section of Then, the hanger number of the hanger 35 is detected by the hanger reader 40 in the loading section of the hanger conveyor 31 and transferred to the sequencer 71. If a hanger number is detected, the hanger number is transferred to the sequencer 71. The sequencer 71 transfers the hanger number to the computer 64 via the sequencer 70 and inputs the hanger number to the internal shift register 80. As a result, the computer 64 rewrites the hanger number in the storage area A1 shown in FIG. 7 from “100”. The shift register 80 in the shift register 71 performs the same shift operation as the shift register 80 of the sequencer 70 described above.

The above operation is similarly performed when the body B is transferred to another hanger conveyor. That is, when the hanger on which the body is placed is changed, the computer 64 rewrites the hanger number in the corresponding storage area in the memory M with a new one. Therefore, by referring to the memory M, it is possible to know what body is mounted on each hanger.

Monitoring of tracking data As described above, each shift register in sequencers 70 to 73
80 shifts the hanger number in response to the movement of the hanger. That is, tracking of the hanger number is performed. Each of the sequencers 70 to 73 has a body B
Transfer the contents of the shift register 80 to the computers 65 to 67 at the timing when the data is transferred to the hanger conveyor on the downstream side. This transfer is performed to at least one of the computers 65 to 67, whereby the hanger number (tracking data) in each shift register 80 is duplicated and held. And sequencer 70 ~
If any one of 73 goes down, hanger number data is transferred from any of the computers 65 to 67 to the shift register 80 of the sequencer. As a result, restoration is performed quickly.

Further, the computer 64 performs the following processing for all the bodies B registered in the painting line.

I: The number of vehicles for each color is displayed by searching the body information in the memory M. This display can be performed on a block basis. This is because it is possible to recognize which block belongs to from the hanger number in the memory M.

II: By retrieving the body information in the same manner as described above, for example, aggregation processing such as vehicle type, destination, and derivative is performed.

III: By checking the movement of the hanger number in the sequencer 80, the flow number of the body B is grasped and displayed in real time. Also, since the flow number of the body B can be recognized in block units and zone units,
The occurrence of a failure can be detected from the increase or decrease in the number.
For automatic failure detection, set upper and lower thresholds for the reference flow number and provide an alarm display when the measured flow number crosses the threshold. I just need.

Furthermore, since the number of flows can be grasped, the tact (the number of products produced per unit time) can be easily controlled. Since the tact can be controlled by the rotation speed of the drive motor of the hanger conveyor, the desired tact is set while monitoring the flow number. Thus, for example, if the tact time of the vehicle set, which is the next step, goes down for some reason, the tact time of the coating line can be reduced correspondingly, and adjustment can be made.

IV: By referring to the contents of each shift register 80 and the contents of the memory M, the block and zone where the body exists are recognized.

The computer 64 and the computers 65 to 67 are connected to a LAN.
Since data can be exchanged via the sequencers 70 to 73, the above-described processing is also performed in the computers 65 to 67 as necessary.

Automatic processing by robot A hanger reader 40 is provided upstream of the robot 902 as shown in FIG.
35 hanger numbers are read. The read hanger number is transferred to the conveyor control panel 52 and further transferred to the sequencer 72. The sequencer 72 compares the transferred hanger number with the hanger number in the shift register 80. Since each storage area of the shift register 80 corresponds to each position of the hanger conveyor, a storage area corresponding to the hanger reader 40 shown in FIG. 9 can be specified. Now, assuming that this storage area is a specific area, if the hanger number tracking and the actual transport of the hanger are normally performed, the hanger number transferred to the sequencer 72 and the hanger number shifted to the specific area are used. Should match. Sequencer
At 72, the presence or absence of a match is detected, and if they do not match, a message indicating this is sent to the control panel 52. control panel
The message supplied to 52 is supplied to the robot control panel 93 via the model distribution panel 100, the line master panel 99, and the stage master panel 97, where a message indicating a mismatch is displayed. If there is a mismatch, there is some abnormality, so the operator performs a recovery process.

On the other hand, when a match is detected in the sequencer 72, the supplied hanger number is transferred to the computer 64, and the computer 64 searches the memory M for body information corresponding to the hanger number. Then, the searched body information is transferred to the model distribution board 100 via the sequencer 72 and the conveyor control board 52. In the model distribution board 100, the job number and the paint color number corresponding to the transferred body information are searched with reference to the table. This job number is supplied to the robot control panel 93 via the line master panel 99 and the stage master panel 97 in order. As a result, the robot control panel controls the robot 90 according to the job number and the paint color number (in the case of a paint robot). As a result, the approaching body B
Is automatically performed. And the robot
For the robots 91 and 92 located downstream of 90, the operation is determined by transferring the job number and the paint color number distributed as described above to the robot control panels 94 and 97.

C: Modifications In the embodiment described above, the following modifications are possible.

Although the shift register 80 is divided into a plurality of zones corresponding to the limit switch LS, the shift register 80 need not be divided unless it is particularly necessary.

In the embodiment, a plurality of blocks are provided. However, when the scale of a production line is small, a single block may be used.

In the embodiment, the rewriting of the memory M at the time of transfer between the blocks of the body B is performed once by the transfer devices 58a and 58b.
A new hanger number is written after rewriting the identification number. On the other hand, the identification number of the transfer device may be omitted, and the new body B may be replaced with the new hanger number when the new body B is mounted on the hanger.

[Effects of the Invention] As described above, according to the present invention, information such as where a workpiece is located on a production line or how many bodies flow in each process is collected. Thus, it is possible to quickly control the production speed, etc., find an abnormality, and respond to a failure.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a configuration of the present invention, FIG. 2 is a schematic configuration diagram showing a configuration of a coating line according to an embodiment of the present invention, and FIG. 3 is a control block showing a control system of the embodiment. FIG. 4, FIG. 4 is a schematic configuration diagram showing the vicinity of a loading section of a hanger conveyor, FIG. 5 is a front view showing a configuration of a hanger plate, FIG. 6 is a conceptual diagram showing a shift register provided in a sequencer, FIG. 8 is a memory map showing storage contents of the memory M of the computer 64, FIG. 8 is an explanatory diagram for explaining a shift operation of the shift register 80, and FIG. 9 is a schematic configuration diagram showing a configuration near the robot 90. 35: hanger (transportation means) 36: hanger plate (identification code), 40: hanger reader (reading means),
55 card reader (input means), 58a-58d transfer device (transfer means), 80 shift register (register means), M memory (storage means), LS limit switch (detection) Means), 64 ... computer (rewriting means).

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23Q 41/08 B23P 21/00 307 B62D 65/00 B65G 43/08

Claims (5)

(57) [Claims] 1. A plurality of transport means for transporting a workpiece placed in an input section to an output section, provided in a transport path from the input section to the output section, and detecting passage of the transport means. One or a plurality of detecting means, an identification code assigned to each of the transporting means, a reading means for reading the identification code of the transporting means at the loading section, and information relating to a workpiece placed at the loading section. Storage means for storing the identification code read by the reading means and information input to the input means as a set each time a workpiece is placed on the transfer means; It has a plurality of storage areas connected continuously indicating the position of the means, inputs the identification code read by the reading means into the first storage area, and vacates the input identification code toward the last storage area. Memory Sequentially shift as long as there is,
And register means for discharging the identification code of the transfer means from the storage area at the last stage when the workpiece is sent from the transfer means existing in the sending section, wherein the register means corresponds to the detection means. The section is divided into a plurality of sections by the boundary, and when an identification code is input to the first-stage storage area of each section, the section is sequentially shifted to the subsequent storage area as long as there is an empty area, and the passage of the transport means is detected by the detection means. A production management system, wherein the identification code in the last storage area of the preceding section of the corresponding boundary is shifted to the first storage area of the next section. 2. A plurality of transport means for transporting a workpiece placed in an input section to a sending section, an identification code assigned to each of the transport means, and an identification code of the transport means. A reading unit to be read by the unit, having a plurality of storage areas connected in series, and inputting the identification code read by the reading unit to the first storage area;
The input identification code is sequentially shifted toward the last storage area as long as there is an empty storage area, and when the workpiece is sent from the transport means in the sending section, the identification code of the transport means is changed to the last row. And (b) placing the workpieces sent from the preceding transport block on the transport means in the loading section of the subsequent transport block. (C) input means for inputting information relating to a workpiece to be placed in the input section of the first-stage transport block; and (d) a workpiece is placed on the transport means of the first-stage transport block. Storage means for storing the identification code read by the reading means of the first-stage transport block and the information inputted to the input means as a set each time the workpiece is transferred by the transfer means; The case, the production management system characterized by comprising a rewriting means for rewriting the identification code reading means has read of the workpiece identification code for the subsequent transport blocks in said storage means. 3. The transfer means is provided with a unique identification code, and the rewriting means transfers the identification code relating to the work in the storage means while the work is present in the transfer means. 3. The production management system according to claim 2, wherein the identification code is rewritten to the identification code of the means, and after the transfer of the workpiece is completed, the identification code is rewritten to the identification code read by the reading means of the subsequent transport block. 4. The apparatus according to claim 1, further comprising one or more detecting means provided in a conveying path from said input section to said transmitting section, for detecting passage of said conveying means, wherein said register means has a boundary corresponding to said detecting means. When the section is divided into a plurality of sections and an identification code is input to the first-stage storage area of each section, the section is sequentially shifted to the subsequent storage area as long as there is an empty area, and the passage of the transport means is detected by the detection means. 3. The production management system according to claim 2, wherein the identification code in the last-stage storage area of the preceding section of the boundary corresponding to and is shifted to the first-stage storage area of the next section. 5. The production management system according to claim 1, wherein said transport means circulates again after returning the workpiece to the loading section after the workpiece has been delivered at the delivery section.