JP5059396B2 - Belt server for pneumatic tire manufacturing - Google Patents

Description

  The present invention relates to a pneumatic tire manufacturing belt server used when a waved belt is molded.

  Waved belts (WAVED belts) are frequently used as belts constituting pneumatic tires. When molding this waved belt, conventionally, a long member including a plurality of cords extending in a wavy shape is supplied to a belt molding drum by a belt server for manufacturing a pneumatic tire and is affixed to the drum surface.

  In that case, it is necessary to apply tension to the long member. For this reason, a tension device that applies tension to the long member is provided in the belt server. This tension device is usually provided with a tension roller around which a long member is wound, and a motor connected to the tension roller, and the long member is wound around the tension roller. The tension is generated in the.

Further, when the long member is supplied to the belt molding drum by the belt server, it is important to control the tension of the long member within an allowable range. Here, the greater the current that flows through the motor connected to the tension roller, the greater the torque that acts on the tension roller (that is, the long member), and in addition to the long member in relation to the rotational speed of the belt molding drum. The tension that is generated is basically determined. For this reason, conventionally, the tension is adjusted by calculating the tension based on the current flowing through the motor and adjusting the current.
However, the tension applied to the long member itself cannot be measured.

In addition, Patent Document 1 discloses that the tension of the waved belt is continuously measured with high accuracy, but this is not the tension at the time of molding the waved belt but the tension at the time of winding the waved belt. It is an example of measuring the above, and it is not disclosed to solve the above problem.
JP-A-8-25514

  In view of the above facts, the present invention has an object to provide a belt server for manufacturing a pneumatic tire capable of measuring tension with high accuracy by measuring tension applied to the long member itself. .

The invention according to claim 1 is a pneumatic tire that is used when a waved belt is molded, and includes a long member that is attached to the belt molding drum and includes a cord extending in a wavy shape, to the belt molding drum. A manufacturing belt server comprising a load cell that is pressed in contact with the long member, and includes a tension calculating means for calculating a tension of the long member based on a pressing force received by the load cell, The belt is arranged between a tension roller that applies tension to the long member and the belt molding drum .

  According to the first aspect of the present invention, when the long member unwound from the pneumatic tire manufacturing belt server is stuck on the belt molding drum, the pressing force applied to the load cell by the long member is used as the tension calculating means. Measure with Here, it is possible to obtain the tension of the long member based on the pressing force by considering the contact form in which the long member contacts the load cell. In the invention according to claim 1, the tension calculating means To calculate the tension of the long member.

  Thus, in the invention described in claim 1, the tension applied to the long member itself can be directly obtained by measuring the force (pressing force) by which the load cell is pressed by the long member. Thus, a pneumatic tire manufacturing belt server capable of measuring tension with high accuracy can be obtained.

The tension of the long member varies depending on factors such as the winding state of the waved belt, variation in rotational resistance of the bearing member of the belt server for manufacturing pneumatic tires, and adhesion of rubber. Therefore, according to the first aspect of the present invention, it is possible to measure the tension of the long member when being molded by the belt molding drum with high accuracy.

The invention according to claim 2 has a function of interrupting the sticking of the long member to the belt molding drum when the tension calculated by the tension calculating means is out of an allowable range. Features.

  This can reliably prevent the cord waveform of the waved belt from being disturbed by tension outside the allowable range. In addition, the application of the long member to the belt molding drum is interrupted, the cause of the abnormality is checked, the abnormal long member or cord is removed, and the application can be resumed. Quality assurance can be further ensured.

Since the present invention has the above configuration, the following effects can be obtained.
According to the invention described in claim 1, by measuring the force (pressing force) that the load cell is pressed by the long member, the tension applied to the long member itself can be directly obtained. Measurement can be performed with high accuracy.
According to invention of Claim 2, the tension | tensile_strength of a elongate member when shape | molding with the drum for belt shaping | molding can be measured with high precision.
According to the invention described in claim 3, the sticking of the long member to the belt molding drum is interrupted, the cause of the abnormality is inspected, the abnormal long member or cord is removed, and the sticking is resumed. Therefore, the quality assurance of the waved belt can be further ensured.

  Hereinafter, embodiments will be described and embodiments of the present invention will be described. As shown in FIG. 1, a belt server 10 for manufacturing a pneumatic tire according to an embodiment of the present invention is a belt used when a waved belt having a plurality of steel cords extending in a wavy manner is formed. It is a server and is arranged so as to supply a ribbon-shaped long member S to be attached to the belt molding drum 16 to the belt molding drum 16. The long member S is a member in which steel cords 12 (see FIG. 3; hereinafter simply referred to as cords 12) are arranged.

  The belt server 10 includes a tension roller 20 that applies tension to the long member S supplied from the upstream side in the conveyance direction, a motor 21 that applies a rotational force to the tension roller 20, and front and rear sides of the tension roller 20 (conveyance). The first bearing 18 and the second bearing 22 are provided respectively on the upstream side in the direction and the downstream side in the transport direction. The second bearing 22 is disposed on the downstream side in the conveyance direction of the tension roller 20. A long member S wound around the tension roller 20 is supported by the first bearing 18 and the second bearing 22.

  Further, the belt server 10 is sequentially provided with a third bearing 24, a tension meter 26 (see also FIG. 2), and a fourth bearing 28 on the downstream side of the second bearing 22 in the conveying direction. The long member S is disposed at a position immediately before reaching the belt molding drum 16. As shown in FIG. 2, the tensiometer 26 has a load cell 27, and the lower surface side of the long member S abuts against the load cell 27 to press the load cell 27.

  The tension meter 26 is a commercially available device, and as shown in FIG. 2, a measurement function for measuring the pressing force applied to the load cell 27 and an operation for calculating the tension of the long member S based on the measured pressing force. And a device having a function.

  Further, the belt server 10 includes a control unit 30. The control unit 30 stops the conveyance of the long member S and the rotation of the belt forming drum 16 by the belt server 10 when the tension calculated by the tension meter 26 is out of the allowable range, and the long member The entire manufacturing system is controlled so that the application of S to the belt molding drum 16 is interrupted. This allowable range is set in advance according to the specification of the long member S and the like.

  In the present embodiment, when the long member S unwound from the belt server 10 is stuck on the belt molding drum, the pressing force applied to the load cell 27 by the long member S is measured. Here, based on the winding angle θ (180 ° in this embodiment) around which the long member S is wound around the load cell 27 and the measured pressing force, the tension of the long member S is measured by the tensiometer 26. Can be sought. Therefore, the tension applied to the long member S itself can be directly obtained, and the tension measurement can be performed with high accuracy.

  Further, since the load cell 27 is disposed at a position immediately before the long member S reaches the belt forming drum 16, the tension of the long member S when formed by the belt forming drum 16 is highly accurate. Can be measured.

  Furthermore, when the tension calculated by the tension meter 26 falls outside the allowable range, the control unit 30 intermediately attaches the long member S to the belt molding drum 16. Accordingly, the interruption can be performed to check the cause of the abnormality, the long member S having the abnormality can be removed and the pasting can be resumed, and the quality assurance of the waved belt can be further ensured. .

(Example)
Hereinafter, an example of the above embodiment will be described in more detail. In this embodiment, the long member S is a strip material having a width of about 20 mm by arranging about 9 to 10 steel cords extending in a wavy manner and coating them with rubber. Further, the belt server 10 is configured to affix the long member S while moving in the width direction of the belt molding drum 16. The width of the tension meter 26 (the width of the load cell 27) is preferably about 50 mm.

  In the present embodiment, a three-point support type tension meter was used as the tension meter 26. The measurement allowable range of the tensiometer 26 used in this example is 10 to 200N.

  In this embodiment, first, the current (tension output) flowing through the motor 21 and the tension actually applied to the long member S by the tension roller 20 were measured, and the correlation between the two was obtained (see FIG. 4). ). In FIG. 4, the values measured by each of the four belt servers are plotted, and the tension output indicates how much current is supplied with respect to the rated current of the motor 21.

  Further, the tension output and the wave magnitude 2a of the waved belt W (see FIG. 1) when the long member S is actually attached on the belt molding drum 16 are set to the wave wavelength λ (both shown in FIG. 3). The correlation with the value (2a / λ) divided by (see FIG. 5) was obtained (see FIG. 5). In FIG. 5, the vertical axis is indicated by a value 100 times 2a / λ. 2a and λ were obtained by copying the waved belt W on the belt molding drum 16 with a camera and measuring the wavelength λ and the amplitude 2a.

  Here, since the movement of the belt server 10 in the drum width direction stops at the end in the width direction of the waved belt W, a tendency slightly different from the central portion (near the center line) of the waved belt W is shown. Therefore, in FIG. 5, the correlation at the width direction end of the waved belt W is plotted with a black rhombus, and the correlation at the center line of the waved belt W is plotted with a black square. The two straight lines shown in FIG. 5 are straight lines drawn based on a black rhombus plot and a black square plot, respectively. The reason why the two straight lines are shown in this way is that the 2a / λ of the waved belt W is a factor that greatly affects the tire performance, and therefore needs to be set more accurately.

  Further, the correlation between the current (tension output) flowing through the motor 21 and the pressing force to the load cell 27 which is a substitute value of the tension actually applied to the waved belt W was obtained (see FIG. 6).

  Further, based on these data, a correlation between the wave size 2a of the long member S and the tension applied to the long member S was derived. And the tolerance | permissible_range of the pressing force to the load cell 27 was set. The upper limit value (allowable upper limit value) and lower limit value (allowable lower limit value) of the allowable range are also shown in FIG.

  When the pressing force to the load cell 27 falls outside the allowable range, that is, when an abnormal value of the pressing force to the load cell 27 occurs, the control unit 30 attaches the long member S to the belt molding drum 16. The production system was suspended.

  The embodiments of the present invention have been described with reference to the embodiments. However, the above embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. Needless to say, the scope of rights of the present invention is not limited to the above embodiment.

It is a side view showing composition of a belt server for manufacture of a pneumatic tire concerning one embodiment of the present invention. It is a perspective view of the tension meter provided in the belt server for pneumatic tire manufacture concerning one embodiment of the present invention. It is a top view of the code | cord | chord which comprises a waved belt. It is a graph which shows the correlation with the tension | tensile_strength measured with the tension output and the tension meter in the belt server for pneumatic tire manufacture of an Example. FIG. 6 is a graph showing a correlation between a tension output and a value obtained by dividing a wave magnitude 2a of a waved belt by a wave wavelength λ in the pneumatic tire manufacturing belt server of the example. It is a graph which shows correlation with tension output and the pressing force to a load cell in the belt server for pneumatic tire manufacture of an Example.

Explanation of symbols

10 Belt server (for manufacturing pneumatic tires)
12 Code 16 Belt molding drum 26 Tension meter (tension calculation means)
27 Load Cell S Long Member W Waved Belt

Claims (2)

A pneumatic tire manufacturing belt server that is used when a waved belt is molded and includes a cord that extends in a wavy shape and is attached to the belt molding drum.
Tension calculating means for calculating the tension of the long member based on the pressing force received by the load cell having a load cell that is pressed in contact with the long member;
The belt server for manufacturing a pneumatic tire , wherein the load cell is disposed between a tension roller that applies tension to the long member and the belt molding drum .   2. The function according to claim 1, wherein when the tension calculated by the tension calculating unit is out of an allowable range, the function of interrupting the sticking of the long member to the belt molding drum is provided. Belt server for pneumatic tire manufacturing.

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