JPS5856760A - Automatic change-over method for arrangement of processing in plate processing line - Google Patents

Abstract

PURPOSE:To prevent malfunction likely to occur when a conventional counting system is adopted, by marking an identification on the last work piece of each lot, sensing the completion of processing for each lot, and by changing over to processing of next lot. CONSTITUTION:The data for every lot are entered previously in the control parts for processing machines No.1, No.2, No.3... which constitute a processing line. An identification ''M'' is marked on the last work piece W of each lot. While processing is carried out, a work W included in a lot A is transported in the processing line, and when the last work marked with identification is fed to the processing machine No.1, a mark sensor MS and a work sensor WS sense off the marking and the length of work, the same operation being carried out at the outlet from the machine No.1, to make sure completion of processing for the lot A. Thereby the machine No.1 is placed on arrangement for processing of the following lot.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is an integrated manufacturing line for wooden products made up of a large number of boards, by confirming the end of a lot for each board loft and changing the processing setup of each processing machine (for example, moving a ruler or cutting a cutter). This relates to a method for automatically performing the exchange of

In the case of wooden products that are constructed by combining a large number of boards with different specifications such as size and shape, the details of the processing performed during manufacturing differ depending on the specifications of the boards, since the specifications of the boards differ.

Generally, such board materials are conveyed through an integrated manufacturing line, and are sequentially subjected to predetermined processing step by step in successive board processing machines, and are assembled into wooden products in the final process.

In order to carry out assembly, painting, etc. in this final process without any problems, it is desirable to balance the number of plates with different specifications at a constant ratio and supply them to the final process.

Therefore, even in the intermediate processing stages, there is a trend toward high-mix, low-volume production, and the lots of plate materials become smaller, and the lots change little by little. As a result, it becomes necessary to frequently change the machining setups of each processing machine for each lot. Although it is not impossible to change the machining setups by visual inspection and manual operation by the operator, This is extremely disadvantageous in terms of the labor-saving effect, which is the main purpose of through-holes in the production line. Therefore, it is required to automate the switching of processing setups.

In the case of an integrated manufacturing (processing or assembly) line that uses a conventional transfer device, processing setup information is sequentially sent to the control unit of each processing machine as the workpiece (workpiece or assembled part) is transferred. It is relatively easy to automatically switch the machining setup by inputting the following information. However, in an integrated manufacturing line for wood products, it is common for boards to be conveyed freely (free flow), so it is impossible to adopt this method.The number of boards passing through the processing machine is counted - (Program control methods are not impossible, but they are unreliable, as it is difficult to distinguish between two pieces if two plates are in contact with each other, and defective products may occur along the way.) If it is removed from the line and twisted, the program itself will be fundamentally disrupted.

Even in a free-flow production line, if the workpieces are placed on pallets, there is a method of placing a type of machining setup LJJ change information material called a dummy on the pallet at the end of the valley lot and sending it to the processing machine. be. However, this method cannot be used in cases where pallets are not used, such as in wood product manufacturing lines. Furthermore, if such a single dummy type is introduced into a manufacturing line for wood products such as the one mentioned above, it is necessary to prepare dummies with the same number of specifications as the specifications of the board material, and it is necessary to prepare a specific dummy with the corresponding board material without fail. It is necessary to combine the products into different lots, and furthermore, the sorting and collection bags after use become cluttered, which also impairs the labor-saving effect. In addition, unless some kind of identification device is attached to the processing machine, the dummy itself may be processed.

The purpose of this invention is to eliminate the difficulties encountered in automating the switching of processing setups in the prior art due to the uniqueness of an integrated production line for wood products made of many boards with different specifications. .

That is, in this invention, an identification mark is attached to the last plate material of each plate material lot, and by detecting this mark, processing setups are automatically switched in each processing machine. .

A more detailed explanation will be given below with reference to the drawings.

The manner in which the identification mark is attached may be designed as appropriate depending on the plate material to be processed and the method of transport thereof, but for example, as shown in FIG. 2, a transverse band-shaped identification mark M is attached to one side of the plate material W.

In an integrated manufacturing line for wood products, for example, as shown in FIG. 1, processing machines 1 to A6 are arranged in series along a board conveyance line. When carrying out this invention, a mark sensor MS and a workpiece sensor WS are arranged in pairs near the entrance and exit of each processing machine. Mark sensor M
S detects the presence of the identification mark M on the plate material, and the workpiece sensor WS detects the passage of the plate material W. Although not shown in the figure, each processing machine is equipped with a control unit such as a minicomputer, which receives the detection signals from the sensors MS and WS and inputs them in advance through numerical control, for example. A processing setup switching command is issued to the processing machine according to the data table corresponding to the setup order.

Various combinations of marks and mark sensors can be considered depending on site conditions, but the following combinations are common.

Identification mark Mark sensor aluminum foil tape Limited reflective photocell metal piece
Proximity switch color mark Color mark sensor magnetic material
It is recommended to use a regular phototube as a relay switch barcode barcode reader or work sensor.

Next, the procedure of the above-mentioned work will be explained in more detail. It is assumed that a data table as shown in FIG. 3 is input in advance to the control units of each of processing machine shops 1 to 2. It is assumed that processing is currently being carried out in the machining shops 1 to Ii 5 according to the processing setups of data A1 to A3, respectively, and a corresponding lot A of plate material is flowing on the conveyance line.

When the last workpiece W of A) reaches the entrance of the processing machine A1, the mark sensor MS detects the identification mark M on the workpiece, and the workpiece sensor WS detects that the entire length of the workpiece has entered the processing machine A1. When this is confirmed, the control section issues an instruction to prevent the next plate material (lot) B from entering the processing machine plate 1. While being processed, the last plate material of A advances to the processing machine &
Upon reaching the exit 1, the mark sensor MS detects the mark M on the plate 6, and the workpiece sensor WS confirms that the entire length of the plate has come out from the processing machine height 1. Then, the control section issues a command according to the data B1, and the processing machine A1 automatically switches the machining setup from data A1 to B1. When the switching is completed, processing a71111 performs processing on the plate material of Ron) B according to the processing setup of data B1.

When the last workpiece W of the workpiece H reaches the entrance of the processing machine A1, the mark sensor MS detects the identification mark M on the workpiece, and the workpiece sensor WS detects that the entire length of the workpiece has entered the processing machine A1. When this is confirmed, the control section issues an instruction to prevent the plate material of the next lot C from entering the processing machine 41. When the last sheet material of lot B that has not been processed advances and reaches the exit of the processing machine height 1, the mark sensor MS detects the mark V on the sheet material, and the work sensor WS detects that the entire length of the sheet material is the processing machine &1. Check that it has come out. Then, the control unit issues a command according to the data C1, and the processing machine A1 receives the data B.
Perform automatic switching of machining setup from 1 to C1. When the switching is completed, the processing machine height 1 performs processing on the plate material of lot C according to the processing setup of day IC1.

The automatic switching of machining setup according to the present invention has been described above for the processing machine jfi1, but this work procedure is exactly the same for the other processing machines &2 and A3.

As is clear from the above, according to the present invention, the end of the lot is detected by attaching an identification mark to the last board of the lot, so preparations such as those using a dummy,
There is no hassle in collection. Moreover, since the last plate material is one that should originally be processed, there is no problem even if it is processed. Furthermore, since only the last board in each lot is marked with an identification mark, and this is detected, there is a possibility that a board in the lot may be missing or the boards before and after may come into contact with each other. However, there are no malfunctions that occur when using the counting method.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of a manufacturing line for wood products to which this invention is applied, Fig. 2 is a perspective view showing an example of the implementation of this invention, and Fig. 3 is an example of processing setups for each processing machine. FIG. 41~3...Processing 41 v s...Mark sensor WS...Work sensor M...Identification mark W...Plate patent applicant Nippon Gakki Manufacturing Co., Ltd. Patent application agent Patent attorney Sugawara ~ Part 1 Figure 31! ! 1

Claims (1)

[Claims] In an integrated production line for wooden products consisting of many boards,
An identification mark is attached to the last plate material in each plate material lot, and by detecting this identification mark in the processing machine, the end of the warped lot can be confirmed, and the processing setup of the processing machine can be automatically changed. 7 Automatic switching method for processing setup in sheet material processing line.