JPH041502A - Residual quantity detector for conductive thin wire reel - Google Patents

Abstract

PURPOSE:To automatically and accurately detect the residual quantity of the conductive thin wire on a reel by making a couple of conductive rollers abut on the conductive thin wire, and detecting a conductive or nonconductive state and detecting the residual quantity. CONSTITUTION:At the winding end part of the steel cord reel 2, and when conductive rollers 10 and 11 roll are turned on the steel cord 1, and the steel cord is left enough on the reel 2, a current flows to the cord 1, but is intermitted since the rolls rollers 10 and 11 are bounced. Then when the cord 1 is further unwound until one roller 10 leaves the cord 1, the roller 10 comes into contact with insulating paper P, so no current flows and a lamp 20 goes out. Consequently, the timing where one of the couple of rollers 10 and 11 leaves the cord 1 can accurately be detected and the residual quantity of the final winding string of the cord 1 remaining on the reel 2 can automatically and accurately be detected from the winding diameter of the reel 2 and the wire diameter of the cord 1.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a device for detecting the remaining amount of conductive strips on a reel wound with conductive strips, particularly for forming bead cores used in tire manufacturing. The present invention relates to a device that can automatically detect the end of a steel cord when the steel cord still remains on the steel cord reel in a steel cord unwinding facility in the process.

(Prior Art) In forming the bead cores used in manufacturing the above-mentioned tires, - A plurality of steel cords are simultaneously fed out from a plurality of steel cord reels, for example, 18 steel cord reels, to form bead cores in multiple rows and stages. is being molded. When manufacturing bead cores using this method, if the remaining steel cord on each steel cord reel is used up and then replaced with a new steel cord reel, defective products will be produced. Since no practical device has been developed that can automatically detect the remaining amount of steel cord on a reel, workers have to visually monitor multiple steel cord reels to detect when the remaining amount is low. It was necessary to replace the old steel cord reel with a new steel cord reel, which required a great deal of effort on the part of the workers and created the possibility of human error. Conventional technology for detecting the remaining amount of steel cord on a steel cord reel involves predicting the remaining amount from the length of the steel cord wound around the steel cord reel and the length of the steel cord unwound from the reel. There are some devices that stop feeding out the reel when this predicted remaining amount reaches a predetermined length. It has also been proposed to press a conductive rod into contact with a steel cord on a steel cord reel, and detect the point at which continuity is lost as the end of the steel cord.

(Issues to be Solved by the Invention!) As mentioned above, the system that predicts and detects the remaining amount from the reel payout amount is not suitable for steel cord reels because there are variations in the amount of winding from steel cord reel to reel and variations in winding amount depending on the manufacturer. It is not possible to accurately detect the amount of steel cord remaining in the steel cord, which may lead to running out of steel cord or having to replace a steel cord reel with a large amount remaining.In addition, if the conductive rod is Items that come into sliding contact with the cord reel may damage the steel cord and cause severe wear on the conductive rod.
It has the disadvantage that it must be replaced frequently, making maintenance extremely troublesome. In order to solve these drawbacks, it is possible to image the steel cord reel using an image sensor or television system and process the resulting image to detect the remaining amount of steel cord, but this is expensive. There are drawbacks. In particular, when forming bead cores, a large number of steel cord reels are used, and providing each of them with an expensive imaging device would require significant equipment costs, which is a practical problem.

It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional conductive strips, to automatically and accurately detect the remaining amount of conductive strips on a reel, and to provide a conductive strip with a simple configuration and low equipment cost. The present invention aims to provide a device for detecting the remaining amount of paper.

(Means and effects for solving the problem) The present invention provides a device for detecting the remaining amount of conductive strips on a reel wound with conductive strips, in which the conductive strips are spaced apart from each other when viewed in the reel axis direction. a pair of conductive rollers arranged so as to be in constant contact with the conductive strips on the reel; a pair of conductive bearings each rotatably supporting the conductive rollers;
means for passing an electric current through the conductive bearing, the conductive roller and the conductive strip; and means for detecting changes in the current flowing through the conductive bearing, the conductive roller and the conductive strip; The present invention is characterized by comprising means for detecting the timing at which the end of the strip comes off one of the conductive rollers.

In such a remaining amount detection device of the present invention, it is possible to accurately detect the timing when one of a pair of conductive rollers comes off the conductive strip, but at this instant, the conductive strip remaining on the roll is detected accurately. is the final winding row, and the remaining amount can be determined from the winding diameter of the roll and the wire diameter of the conductive strip. In addition, since the conductive strips are in contact with the conductive rollers that are rotatably supported by conductive bearings, the conductive strips are not damaged and the wear of the conductive rollers is extremely low. , maintenance is also easier. Furthermore, since the configuration is very simple, it can be implemented at low cost.

(Embodiment) FIG. 1 is a front view showing the configuration of an embodiment of the remaining amount detecting device for a conductive strip reel according to the present invention, and FIG. 2 is a side view thereof. In this example, a steel cord for forming a bead core used in the manufacture of tires as a conductive strip will be used as an example. Generally, a steel cord 1 is wound around a steel cord reel 2, and a plurality of steel cords let out from a plurality of steel cord reels are wound onto a drum together with a rubber sheet to form a bead core. That is, the steel cord reel 2 is rotatably supported by insulating free rollers 3 and 4, and the steel cord 1 fed out from the steel cord reel is sent out to the bead core forming drum via the guide roller 5. A detection head 6 is provided to detect the end of the steel cord l on the steel cord reel 2, this detection head is fixed to the center of the arm L7, and this arm is arranged to be rotatable about a shaft 8. An insulating plate 9 is inserted between the detection head 6 and the arm 7 to electrically insulate the detection head from the arm. The detection head 6, as clearly shown in FIG.
A pair of conductive rollers 10 and 11 are arranged at a predetermined interval in the longitudinal axis direction of the steel cord reel 2, and a pair of conductive rollers rotatably support these conductive rollers via conductive bearings 12 and 13, respectively. Conductive axis 1
4 and 5. These conductive shafts 14 and 15 are supported by support plates 16 and 17 made of insulating material, respectively.
It is connected to the frame 18 via. A housing 19 is attached to this frame I8, a lamp 20 is attached to this housing, and this lamp is connected to terminals 21 and 22 provided on the housing 19. Further, a power source 24 is provided, and one output terminal 24a thereof is connected to one of the conductive shafts 14 via a lead wire 23. In addition, the other conductive shaft 1
5 is connected to the terminal 21 via the lead wire 25 and to the siB detection circuit 27 via the lead wire 26, and this continuity detection circuit is connected to the other output terminal 24b of the power supply 24. Further, the terminal 22 provided on the housing 19 is connected to the other output terminal 24b of the power source 24 via a lead wire 29. In this way, the lamp 20 and the continuity detection circuit 27
will be connected in parallel to the power supply 24.

Now, if a sufficient amount of steel cord 1 remains on the steel cord reel 2, from one output terminal 24a of the power supply 24, the lead wire 23, the conductive shaft 14, the conductive bearing 12, the conductive The other output terminal 24 of the power supply 24 passes through the roller 10, the steel cord l remaining on the reel, the conductive roller 11, the conductive bearing 13, the conductive shaft 15, the lead wire 26, and the continuity detection port 127.
As the current flows through the conductive shaft 15, the current flows through the lead wire 23, the terminal 21, the lamp 20, the terminal 22, and the lead wire 29 to the other output terminal 24b of the power source 24. As a result, the lamp 20 will be lit, and the continuity detection circuit 27 will detect the continuity state. In this manner, the operator can see that the steel cord 1 remains on the steel cord reel 2 for a sufficient length by seeing that the lamp 20 provided on the housing 17 is lit. In addition, the continuity detection circuit 27
The detection signal outputted from the control unit 28 is transmitted to the control unit 28, and the feeding of the steel cord is controlled based on the detection signal.

FIG. 3 shows changes in the signal detected by the continuity detection circuit 27 at the end of winding of the steel cord reel. Period T1 indicates a state in which enough steel cord remains on the steel cord reel 2 for both conductive rollers 14 and 15 to move over the steel cord 1. In this state, current flows through the steel cord 1, but since the conductive rollers 14 and 15 dance on the steel cord, the current does not flow steadily but intermittently. As the steel cord 1 on the steel cord reel 2 is further unwound and one of the conductive rollers 14 comes off the steel cord, this roller comes into contact with the insulating paper P wound on its lower side. The current stops flowing and the lamp 20 goes out. The detection handle is placed at such a position that even in this state, a sufficient amount of steel cord 1 remains on the steel cord reel 2 to form one more bead core. After the detection head 6 detects the end of the steel cord 1 on the steel cord reel 2 in this way, the control section 28 enters the timer control mode.
During the period T2, for example, the steel cord is allowed to be fed out as usual for 1 minute and 10 seconds.

This time is set so that the remaining amount of steel cord on the steel cord reel is about 411. Thereafter, the feeding speed is changed to a low speed, and the feeding is stopped after being fed for a period T3, for example, for 10 seconds. At the same time, the control unit 28 sounds a buzzer to notify the worker of the end of the steel cord. The worker replaces the steel cord reel in response to the buzzer, and then resumes the bead core forming process.

(Effects of the Invention) As described above, according to the device for detecting the remaining amount of a conductive strip according to the present invention, a pair of conductive rollers is brought into contact with the conductive strip to detect whether the conductive strip is conductive or non-conductive. Since the remaining amount is detected by the detection, it is possible to accurately detect the timing when the remaining conductive strip on the reel reaches a predetermined length. In addition, since the conductive roller is rotatably supported by a conductive bearing, the conductive strip will not be damaged by contact between the conductive roller and the conductive strip, and the wear of the conductive roller will be reduced.
Maintenance is also easier because the frequency of replacement is lower. Further, as the conductive rollers and conductive bearings, generally commercially available rollers and bearings can be used as they are, and they can be manufactured at a very low cost. Therefore, in forming bead cores used in tire manufacturing, there is an advantage that the equipment cost does not increase so much even if a detection head is provided on each of a large number of steel cord reels.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the configuration of an embodiment of the remaining amount detecting device for a conductive strip reel according to the present invention, FIG. 2 is a side view thereof, and FIG. It is a graph showing changes. 1... Steel cord 2... Steel cord reel 6... Rad to detection 7... Arms 10, 11
Conductive rollers 12, 13 Conductive bearings 14, 15 Conductive shaft 16.17 Insulating plate 20 Lamp 24 Power source 27
...Continuity detection circuit 28...Control unit Fig. 2 Fig. 1 Fig. 3 Fig. 15 "Biranjuu completed link"

Claims (1)

[Claims] 1. In a device for detecting the remaining amount of conductive strips on a reel wound with conductive strips, the conductive strips are always separated from each other on the reel when viewed in the axial direction of the reel. A pair of conductive rollers arranged so as to be in contact with each other, a pair of conductive bearings that rotatably support the conductive rollers, and a current flowing through the conductive bearings, the conductive rollers, and the conductive strips. and means for sensing changes in the current flowing through the conductive bearing, the conductive roller and the conductive strip to detect when the end of the conductive strip on the reel disengages one of the conductive rollers. A remaining amount detection device for a conductive strip reel, characterized by comprising: