JPS5816726B2 - Method for marking coated metal long bodies during continuous production - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the process of continuously coating rubber or plastic onto a metal body, the present invention provides line length marks necessary for cutting the coated elongated body into predetermined lengths in the next process. It relates to a method of applying

In general, in the coating process, winding each length onto a work bobbin required for the next process increases the number of times the bobbin needs to be replaced, which takes time and effort, and requires the use of a large number of work bobbins. This is not done for reasons of economy, and it is common practice to cover as long as possible in the coating process, and then cut it into the required length in the next process.

In this case, the single length mark was made on the covering of the long body by applying paint or wrapping tape in accordance with the instructions of a predetermined unit from a measuring device installed on the production line.

However, since such a method usually relies only on visual inspection to detect the marking location in the next step, there are problems such as overlooking these marks.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a marking method that allows easy detection of the marking location in the next process. The progress of the elongated body is partially stopped, and during this time the coated metal elongated body is held and pressurized by multiple heating blocks, and the rubber or plastic coating is melted and flowed out until the metal body is exposed. By providing the elongated body with a recessed portion covered with rubber or plastic of a predetermined length, this recessed portion can be easily detected in the next step.

The present invention will be explained using the drawings.

Fig. 1 is an explanatory diagram of a production line for coated metal elongated bodies, and shows where markings are to be made. A conductor (in the case of a cable) is coated with rubber or plastic by an extrusion rod 3 to become a coated metal body 4, cooled in a water tank 5, passed through a take-off machine 6, an accumulator 7, and a measuring device 8 to a marking device 9. After being marked with 5, it is wound up by a winding machine 10.

A case will be described in which the marking method using the marking device 9 described above is applied to a coated wire, such as a coaxial cable or a coaxial cord.

Figure 2 shows the main parts of the marking device, in which A is a side view, 11 is a coated wire, 12 and 12' are heating blocks,
13 is an air cylinder, 14, 14' is a heating block 12
, 12' have built-in heaters, and A of 12'.
-A sectional view, C shows a plan view of the side of the heating block that is in contact with the covered wire, and two heating blocks 12, 12' are disposed above and below (or horizontally) the covered wire 11.

When the coated wire reaches a predetermined unit length, a command is received from the measuring device 8 to first stop the winding machine and stop the coated wire 11 near the marking device.

Next, heating blocks 12 and 12' heated by heaters 14 and 14' clamp and pressurize the coated wire 11 to melt the rubber or plastic coating, as shown in FIG.
Recess 17 in insulator 16 (rubber or plastic coating)
(The length of the recess is usually about 30 to 40 mm) and the heating blocks 12, 12' are removed for a certain period of time and separated from the covered wire to complete the marking.

The required time is about 10 seconds, and the accumulator 7 stores the coated wire that has been stopped during this time up to the maximum amount of wire storage, so the coating operation of the extruder 3 continues without stopping.

Once the marking is completed, the partial suspension is released and normal continuous production is resumed, and the coated wire begins to advance in the longitudinal direction and is wound on the winder.

Therefore, if the measuring device, air cylinder, and winding machine are linked together, marking can be performed automatically.

To give a supplementary explanation about the heating blank, as you can see from the opening in Figure 2, there is a semicircular groove 2 with a width equal to the outer diameter of the covered wire.
The conductor diameter has a semicircular groove 2L21' within the allowable range where the conductor diameter is equal to 0.20'.

Furthermore, both ends of the groove 2L21' are slightly inclined to form a conical shape (see FIG. 2C), and serve to form rubber or plastic notches as shown in FIG. 3.

In order to detect the concave portion of the rubber or plastic formed in the coated wire as described above, that is, the marking location in the next step, a fixed roll 30, a detection roll 31, and a limit switch 32 are combined as shown in FIG. both rolls 3
Pass between 0.31 and 0.31.

Figure 4A shows the case where a normal covered wire is passing through.

In this case, the switch is closed, so the motor (not shown) incorporated in this circuit is operating.

Fig. 4 indicates passage through the recess, and the switch opens and the motor stops, making it possible to easily and reliably detect the marking location.

As explained in the examples above, the present invention is a method that can reliably mark a coated metal elongated body during continuous production, and the marking location can be accurately detected mechanically rather than visually. Therefore, its industrial value is great.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the production line, Fig. 2 is an explanatory diagram of the heating block, A is a side view, the opening is an A-A sectional view of A,
C is a plan view of one heating block, FIG. 3 is an explanatory diagram of the notch, that is, the marking location, FIG. 4 is an explanatory diagram of the marking location detection method, and A is the normal part when the detection roll passes;
2 are explanatory diagrams at the time of detecting a marking location. 7... Accumulator, 9... Marking device, 11... Covered wire, 12, 12'...
...Heating block, 13... Air cylinder, 14, 14'... Heater, 15...
Conductor, 16... Insulator, 20, 20', 21° 21... Groove of heating block, 30...
Fixed roll, 31...Detection roll, 32...
···Limit switch.

Claims (1)

[Scope of Claims] 1. By providing at least one line storage mechanism when marking is made at predetermined intervals during continuous production of elongated bodies in which rubber or plastic is continuously coated on metal bodies, The movement of the long body in the longitudinal direction near the marking position is partially temporarily stopped, and the rubber or plastic coating is held and pressurized by a plurality of heating blocks to melt and spread the long body to a predetermined length. 1. A method for marking a coated metal elongated body during continuous production, the method comprising forming a recess that can be detected in a subsequent step of the rubber or plastic coating. 2. The marking means includes a marking device consisting of a block each having a heating mechanism between the wire storage mechanism and the winding mechanism, and a measuring device installed on this production line to reach a predetermined unit length. According to claim 1, the series of operations of stopping the winding mechanism→starting the marking device→completion of marking→starting the winding mechanism and start of winding are performed in conjunction with each other in response to a command. A method for marking coated metal elongated bodies during continuous production.