JPWO2005065924A1 - Belt characteristic detection method and belt characteristic detection apparatus - Google Patents

Abstract

It is an object of the present invention to provide a belt characteristic detection method and a belt characteristic detection device capable of enhancing quality control of product tires. The belt characteristic detection device is a device that detects the characteristic of the belt 22 affixed on the drum 21, and applies laser beams to two irradiation positions 28R and 28L on a straight line on the outer peripheral surface of the drum along the drum rotation axis. A laser displacement meter that measures the radial displacements of the irradiation positions 28R and 28L by irradiating and measuring each reflected light, and a measurement signal received from the laser displacement meter, and a difference between the radial displacements of the irradiation positions 28R and 28L Whether the direction of the edge 22E in the traveling direction R of the belt 22 is rising to the right or to the left is detected based on the calculating unit that calculates the difference, the sign of the difference calculated by the calculating unit, and the rotation direction of the drum 21 And a detecting unit. As a result, it is possible to easily detect whether the edge 28E is rising to the right or rising to the left by the sign of the difference. [Selection] Figure 6

Description

  The present invention relates to a belt characteristic detection method and a belt characteristic detection device for a belt constituting a tire, and more particularly, a belt characteristic detection method and belt optimal for manufacturing a pneumatic tire for heavy loads in particular. The present invention relates to a characteristic detection device.

  When producing a pneumatic tire, a belt is wound around the drum and stuck on the drum to produce an unvulcanized tire.

  When the belt is applied in this manner, for example, in Patent Documents 1 and 2, as shown in FIG. 14, the edge 82E on the front end side of the belt 82 with respect to the conveyance direction U is in the conveyance direction while the belt 82 to be adhered is being conveyed. It is disclosed that whether or not the inclination direction of the edge 82E of the belt 82 with respect to the transport direction U is correct is determined before sticking by detecting whether the belt 82 is rising to the right or to the left.

  However, conventionally, after the belt 82 has been applied, it has not been determined whether or not the inclination direction is correct. Therefore, for example, it is necessary to peel off the belt 82 after it has been applied, and when this belt is then re-applied by hand, even if the direction of the outer peripheral surface and inner peripheral surface of the belt is applied incorrectly, the belt 82 is still in the air. Production of tires is continued, and defective pneumatic tires are produced. For this reason, there has been a problem that quality control of product tires is insufficient. This problem has been particularly serious in heavy-duty pneumatic tires.

  In this way, attaching the belt 82 with a wrong inclination direction of the end edge 82E (that is, with the predetermined front and back of the belt 82 reversed) is a belt prepared in advance in a normal molding operation. The probability that occurs when an extraordinary operation such as manually attaching is carried out is much higher than the probability that occurs when the material is carried and attached.

Conventionally, it has not been determined whether or not the belt 82 has been forgotten to be stuck, and a practical detection means that can reliably detect the number of belts stuck for quality control of product tires. The appearance was desired.
JP-A-9-201885 JP-A-7-323490

  In view of the above facts, an object of the present invention is to provide a belt characteristic detection method and a belt characteristic detection device that can improve the quality control of a product tire.

  As a result of examination by an experiment etc., the present inventor has a difference in the polarity of the lateral direction component generated in the belt when the tire is rotated due to the difference in the belt attaching direction, that is, the difference between right-up and left-up. I found out. And further examination was repeated and it came to complete this invention.

  The invention according to claim 1 is characterized by measuring a lateral direction component of a force generated in the tire by rotating the tire, and detecting a characteristic of a belt constituting the tire based on the lateral direction component. And

  Thereby, the belt characteristics can be easily measured in a short time.

  The invention according to claim 2 is characterized in that the lateral direction component is measured by attaching and rotating the tire on a uniformity machine.

  As a result, the lateral direction component can be measured using an existing apparatus provided in a production line or the like, and there is no need to significantly modify the existing testing machine.

  The invention according to claim 3 is characterized in that the direction of the belt is detected based on the rotation direction of the tire and the polarity of the lateral direction component.

  Thereby, when the belt is affixed in the wrong direction (for example, when the belt is affixed with the front and back of the belt reversed in advance), this can be easily detected in a short time. .

  According to a fourth aspect of the present invention, the presence or absence of the belt is detected based on the size of the lateral direction component.

  Thereby, when the belt is not stuck, this can be easily detected in a short time.

  According to a fifth aspect of the present invention, there is provided a belt characteristic detecting device for detecting a characteristic of a belt stuck on a drum, wherein a laser is applied to two irradiation positions on a straight line on the outer peripheral surface of the drum along the drum rotation axis. A laser displacement meter that radiates light and measures each reflected light to measure a radial displacement of the irradiation position of the two points; receives a measurement signal from the laser displacement meter; Based on the calculation unit for calculating the difference in radial displacement, the sign of the difference calculated by the calculation unit, and the rotation direction of the drum, the direction of the circumferential edge of the belt rises to the right or to the left And a detector for detecting the above.

  In this specification, the difference means a value including positive and negative. The sign of the difference is reversed between the case where the circumferential edge of the belt is rising to the right and the case where it is rising to the left. Therefore, it is possible to easily detect whether the circumferential edge is rising to the right or rising to the left by the sign of the difference.

  The invention according to claim 6 is characterized in that the irradiation positions of the two points are separated from each other by 0.5 cm or more.

  This makes it possible to reliably detect whether the circumferential edge is rising to the right or rising to the left.

  The invention according to claim 7 is an input unit that inputs in advance whether the setting direction of the circumferential edge of the belt is rising to the right or rising to the left, a determination unit to which input data from the input unit is transmitted, The determination unit determines whether the direction of the circumferential edge of the belt is normal or abnormal based on a signal from the detection unit and the input data.

  As a result, the belt characteristic detection device determines whether the direction of the circumferential edge of the belt is normal or abnormal, so that it is not necessary for the operator to determine based on the data detected by the detection unit.

  The invention according to claim 8 is provided with an edge direction warning means for notifying an operator of an abnormality, and the determination unit detects the edge direction when the detected direction of the circumferential edge is different from the set direction. A warning means is activated by sending a signal.

  Thereby, it is reliably transmitted to the operator that the determination unit has determined that the abnormality has occurred.

  According to a ninth aspect of the present invention, the laser displacement meter measures the reflected light from at least one of the two irradiation positions over a predetermined circumferential length of the drum, thereby increasing the radial height of the drum outer peripheral surface. The maximum value is measured, and the determination unit determines that the belt has been applied by increasing the maximum value by a belt thickness every time a signal indicating that the belt application operation has been performed is received. It is characterized by that.

  Thereby, when there is a sticking missing, this can be detected by the belt characteristic detecting device.

  According to a tenth aspect of the present invention, the outer peripheral surface of the drum is configured by outer peripheral surfaces of a plurality of segments, and the predetermined peripheral length is a length within a range from the peripheral length of the outer peripheral surface of one segment to the entire periphery of the drum. It is characterized by that.

  Accordingly, even if the cross section of the outer peripheral surface of the drum is not a perfect circle due to unevenness between adjacent segments, the effect of the ninth aspect can be reliably achieved.

  The invention according to claim 11 is provided with a sticking warning means for notifying an operator of abnormality, and the determination unit increases the maximum value by a belt thickness even when receiving a signal indicating that the belt sticking operation has been performed. Otherwise, a signal is transmitted to the sticking warning means to actuate.

  Thereby, it is reliably transmitted to the operator that there is a lack of sticking and the determination unit determines that there is an abnormality.

  Since the present invention is configured as described above, it is possible to realize a belt characteristic detection method and a belt characteristic detection apparatus that can improve the quality control of product tires.

In 1st Embodiment, it is a top view which shows that the direction of a belt is a correct direction. In 1st Embodiment, when the direction of a belt is a right direction, it is a graph which shows LF value obtained by a uniformity machine. In 1st Embodiment, it is a top view which shows that the direction of a belt is a wrong direction. In 1st Embodiment, when the direction of a belt is a wrong direction, it is a graph which shows LF value obtained by a uniformity machine. It is a block diagram which shows the structure of the belt characteristic detection apparatus which concerns on 2nd Embodiment. In 2nd Embodiment, it is the partial side view seen from the drum outer peripheral surface side which shows that the direction of the belt affixed on the drum is a correct direction. It is a graph which shows the value of the radial direction height H obtained by a laser displacement meter in 2nd Embodiment. It is a graph which shows the difference of the radial direction height H obtained by the laser displacement meter in 2nd Embodiment. In 2nd Embodiment, it is the partial side view seen from the drum outer peripheral surface side which shows that the direction of the belt affixed on the drum is a wrong direction. It is a graph which shows the value of the radial direction height H obtained by a laser displacement meter in 2nd Embodiment. It is a graph which shows the difference of the radial direction height H obtained by the laser displacement meter in 2nd Embodiment. In 2nd Embodiment, it is a graph which shows the value of the radial direction height H in the drum surface obtained by a laser displacement meter. In the second embodiment, a graph showing a state in which the values of the radial heights H of the drum surface, the first belt surface, and the second belt surface obtained by the laser displacement meter are displayed in an overlapping manner. is there. FIG. 10 is a plan view showing that it is conventionally determined whether the edge on the leading end side of a belt being conveyed is rising to the right or rising to the left.

  Hereinafter, embodiments will be described and embodiments of the present invention will be described.

[First Embodiment]
First, the first embodiment will be described. In this embodiment, the inspection specification is determined by a bar code attached to each product tire.

  In the present embodiment, a product tire is attached to a general uniformity machine (not shown), and a lateral direction component (hereinafter referred to as LF) of a force generated in a belt 12 (see FIGS. 1 and 3) constituting the tire by the uniformity machine. Value). The belt 12 is composed of a plurality of ply pieces 14 arranged in the same direction.

  More specifically, as shown in FIG. 1, when the direction of the belt 12 is normally provided (that is, when the front and back of the belt 12 coincide with a predetermined front and back, the traveling direction R As shown in FIG. 2, the polarity of the LF value is determined when the tire rotates in the forward direction, when the end edge 12E of the front end portion rises to the right when viewed in the direction orthogonal to the belt surface from the drum outer peripheral surface side. Positive and negative when reversing. As shown in FIG. 3, when the direction of the belt 12 is reverse (that is, when the front and back of the belt 12 do not coincide with the predetermined front and back, the edge 12E of the front end in the traveling direction R rises to the left. 4), the polarity of the LF value is opposite to that of the case where the belt 12 is normally provided.

  On the other hand, the uniformity machine is provided with an operation screen for inputting in advance whether the polarity of the lateral direction component measured when the direction of the belt 12 is normal is positive or negative. This polarity is input in advance based on the tire size, tire type, etc. read by the code. Note that the uniformity machine may automatically read and input a barcode.

  The uniformity machine has an abnormality in the direction of the belt 12 based on the rotation direction of the tire (that is, the traveling direction R of the belt 12), the polarity of the measured LF value, and the polarity of the LF value input in advance. If it is determined that there is an abnormality, a determination unit (not shown) that determines whether there is an abnormality is displayed on the operation screen.

  Thus, according to the present embodiment, by measuring the LF value with a uniformity machine operating in the mass production factory and checking whether there is an abnormality in the polarity or magnitude of the LF value (LF check), It is possible to easily inspect in a short time whether there is an abnormality such as an error in the orientation of the belt 12 or forgetting to stick. Therefore, it is not necessary to provide a new detector or to remodel the existing testing machine.

  An alarm device may be connected to the uniformity machine so that when such an abnormality is detected, an alarm sounds and the operator is alerted.

[Second Embodiment]
Next, a second embodiment will be described. As shown in FIG. 5, the belt characteristic detection device 20 according to the present embodiment determines the characteristic of the belt 22 (see FIGS. 6 and 9) stuck on the drum 21 to form an unvulcanized tire. Device.

  The belt characteristic detection device 20 includes a laser displacement meter 26 that measures the displacement of the outer peripheral surface of the drum in the radial direction. The laser displacement meter 26 irradiates laser beams 30R and 30L to two irradiation positions 28R and 28L on a straight line on the outer peripheral surface of the drum along the drum rotation axis 21A, and measures each reflected light, thereby Each height in the radial direction on the outer peripheral surface is measured. The irradiation positions 28R and 28L are separated from each other by 0.5 cm.

  Further, the belt characteristic detection device 20 includes a calculation unit 34 that calculates a difference between two radial heights transmitted from the laser displacement meter 26 via the amplifier 32, and a rotation direction detection that detects the rotation direction of the drum 21. Part 36.

  Further, the belt characteristic detection device 20 receives data from the calculation unit 34 and the rotation direction detection unit 36, and the edge 22E of the affixed belt 22 is viewed from the drum outer peripheral side in a direction perpendicular to the belt surface. And a detection unit 38 for detecting whether the belt 22 is rising to the right or to the left (hereinafter referred to as the detection direction of the belt 22).

  Further, the belt characteristic detection device 20 determines whether the edge 22E on the front end side in the rotational direction of the belt 22 should be raised to the right or the left (hereinafter, referred to as a setting direction of the belt 22). A sequencer 40 that is preliminarily input via a screen is provided. Furthermore, the belt characteristic detection device 20 includes a determination unit 42 that receives data from the sequencer 40. The determination unit 42 compares the detection direction of the belt 22 with the set direction of the belt 22, and is attached to the belt. When it is determined that there is an abnormality in the direction of the head 22, the fact is displayed on the operation screen and the alarm device 46 provided in the belt characteristic detection device 20 is sounded.

  Further, the detection unit 38 detects the number of belts 22 applied based on the data from the laser displacement meter 26, and the determination unit 42 receives data from the detection unit 38 and the belt 22 is not attached. When it is determined, the alarm device 46 is sounded with a different sound type from that when it is determined that the orientation is abnormal.

  Hereinafter, the operation of the belt characteristic detection device 20 will be described.

(Action for judging correctness of belt detection direction)
When the two laser beams 30R and 30L are irradiated from the laser displacement meter 26 in a state where the drum 21 is rotated in the forward direction (that is, the rotation direction indicated by the arrow in FIG. 5), the respective reflected lights from the irradiation positions 28R and 28L. Is measured by the laser displacement meter 26, and the radial heights of the irradiation positions 28R and 28L are monitored.

  Here, as shown in FIG. 6, when the direction of the affixed belt 22 is the same as the set direction, the end on the front end side in the rotational direction of the belt 22 with respect to the traveling direction R of the belt 22 due to the rotation of the drum 21. Since the edge 22E is inclined clockwise by an angle θ (θ is a value within the range of 0 ° <θ <90 °), the irradiation position 28L has a higher radial height before the irradiation position 28R. . Accordingly, the relationship between the radial height H of the irradiation position 28R and the elapsed time t is like a line 50R as shown in FIG. 7, and the relationship between the radial height H of the irradiation position 28L and the elapsed time t is shown in FIG. A line 50L as shown in FIG. As a result, the height difference G between the irradiation position 28R and the irradiation position 28L calculated by the calculation unit 34 is as shown in FIG. 8, and the height difference G when the edge 22E passes the irradiation position 28 is positive. It becomes the value of.

  On the other hand, as shown in FIG. 9, when the direction of the affixed belt 22 is opposite to the set direction, the edge on the front end side in the rotational direction of the belt 22 with respect to the traveling direction R of the belt 22 due to the rotation of the drum 21. Since 22E is inclined counterclockwise by an angle θ (that is, an angle −θ clockwise), the irradiation position 28R has a higher radial height before the irradiation position 28L. Therefore, the relationship between the radial height H of the irradiation position 28R and the elapsed time t is as shown by a line 52R as shown in FIG. 10, and the relationship between the radial height H of the irradiation position 28L and the elapsed time t is shown in FIG. A line 52L as shown by 10 is obtained. As a result, the height difference G between the irradiation position 28R and the irradiation position 28L calculated by the calculation unit 34 is as shown in FIG. 11, and the height difference G when the edge 22E passes the irradiation position 28 is negative. It becomes the value of.

  When the belt 22 is affixed in the correct direction, the determination unit 42 is input in advance that the set direction of the belt 22 is positive. Therefore, the correctness / incorrectness of the direction of the affixed belt 22 can be determined instantaneously based on the rotation direction of the drum 21 and the sign of the calculated height difference G. That is, when the rotation direction of the drum 21 is the positive direction, when the height difference G is positive, it is determined that the belt 22 is attached in the correct direction, and when the height difference G is negative, the belt 22 is determined. Is determined to have been attached in the wrong direction.

  When the drum 21 is rotated in the reverse direction, the value of the height difference G is calculated in the reverse direction compared to when the drum 21 is rotated in the forward direction. When the rotation direction of the drum 21 is the reverse direction, the determination unit 42 determines the correct / incorrect determination based on whether the height difference G is positive or negative as opposed to the positive direction. That is, in this embodiment, when the rotation direction of the drum 21 is reversed, when the height difference G is negative, the belt 22 is stuck in the correct direction, and when the height difference G is positive. It is determined that the belt 22 is stuck in the wrong direction. Then, the alarm device 46 is sounded to call attention to the operator.

  As described above, the reflected light at the two irradiation positions 28R and 28L is measured by the sensor (not shown) of the laser displacement meter 26, and the difference is obtained and determined. Whatever the number of stacked belts, it can be determined by a single logic and a single threshold value.

(Action for judging correctness of the number of belts attached)
The laser displacement meter 26 measures the reflected light from the irradiation position 28R over the entire drum. Here, the drum 21 is composed of a plurality of segments 21P (see FIG. 5), and the cross section of the outer peripheral surface of the drum is not necessarily a perfect circle, and the radial height H measured at the irradiation position 28R is as follows. The relationship with the elapsed time t is as shown by a line 54R in FIG. For example, when a belt 22 having a thickness of 1 mm is attached to the outer peripheral surface of the drum, the relationship between the radial height measured at the irradiation position 28R and the elapsed time t is as shown by a line 56R in FIG. 13 (in FIG. 13, the drum 21 It also shows the radial height of its outer periphery. When a belt 22 having a thickness of 1 mm is further affixed thereon, the relationship between the radial height H measured at the irradiation position 28R and the elapsed time t is as shown by a line 58R shown in FIG.

  Accordingly, if the maximum height of the drum surface (the maximum peak value of the radial height H) is HD, the maximum height of the first belt 22 is H, and the maximum height of the first belt 22 is H2. HD, H1, and H2 always satisfy the following relational expression.

HD <H1 <H2
The determination unit 42 determines the number of belts 22 to be applied based on the maximum height of the drum outer peripheral surface measured by the laser displacement meter 26.

  The determination unit 42 receives a signal to that effect each time the belt 22 is applied, and even if this signal is received, the maximum height is equal to the gauge thickness (belt thickness). ) Is not increased, the alarm device 46 is sounded. Note that the sound type (scale, timbre, etc.) at that time may be a sound type different from the sound type that is sounded when the direction of the belt 22 is determined to be incorrect.

  Thus, by determining the number of belts 22 to be applied based on the maximum height of the outer peripheral surface of the drum, the first belt 22 has a portion 61 whose height is lower than HD, and the second belt 22 has H1. Even if there is a portion 62 having a lower height than that, the number of belts 22 to be attached can be reliably measured.

  In addition, the belt characteristic detection device 20 according to the present embodiment performs the sticking confirmation at the belt sticking station of all tire molding machines regardless of the member supply method such as the fixed length server method, the winding cut method, and the rear hand sticking method. It can be used as a device to perform, and is not limited by the server form.

  Further, since the change in the radial height (change in gauge) of the outer peripheral surface of the drum is constantly monitored, the orientation of the belt 22 can be confirmed not only by a presumed sticking operation but also by manual rework. And the number of pasted sheets can be confirmed reliably.

  In addition, by determining with the maximum height in this way, even if there are irregularities between adjacent segments constituting the drum 21 or irregularities or eccentricity in the segments of the drum 21 itself, the number of pasted sheets can be detected reliably. can do.

  In this embodiment, the number of belts 22 attached is determined by measuring the reflected light from the irradiation position 28R over the entire circumference of the drum. However, by measuring the reflected light from the irradiation position 28L over the entire circumference of the drum. You may judge.

  As described above, according to the present embodiment, if the orientation of the belt 22 or the number of pieces to be attached is wrong in the tire forming process for attaching the belt 22, this can be detected and excluded. Accordingly, it is possible to prevent defective products from flowing out in subsequent processes.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these 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.

  As described above, the belt characteristic detection method and the belt characteristic detection device according to the present invention are suitable for use as a belt characteristic detection method and a belt characteristic detection device that can improve the quality control of the product tire.

Explanation of symbols

12 Belt 12E Edge 20 Belt characteristic detection device 21 Drum 21A Drum rotation shaft 21P Segment 22 Belt 22E Edge 26 Laser displacement meter 28R, L Irradiation position 34 Calculation unit 38 Detection unit 42 Determination unit 44 Input unit 46 Alarm device (edge) Direction warning means, sticking warning means)
82 Belt 82E Edge

Claims (11)

Measure the lateral component of the force generated in the tire by rotating the tire,
A belt characteristic detection method, comprising: detecting characteristics of a belt constituting the tire based on the lateral direction component.   The belt characteristic detection method according to claim 1, wherein the lateral direction component is measured by attaching and rotating the tire on a uniformity machine.   The belt characteristic detection method according to claim 1, wherein the direction of the belt is detected based on a rotation direction of the tire and a polarity of the lateral direction component.   4. The belt characteristic detection method according to claim 2, wherein presence / absence of the belt is detected based on a size of the lateral direction component. A belt characteristic detection device for detecting the characteristics of a belt affixed on a drum,
Laser displacement for measuring the radial displacement of the two irradiation positions by irradiating laser light to two irradiation positions on a straight line on the outer peripheral surface of the drum along the drum rotation axis, and measuring each reflected light Total
A calculation unit that receives a measurement signal from the laser displacement meter and calculates a difference in radial displacement between the two irradiation positions;
A detection unit that detects whether the direction of the circumferential edge of the belt is rising to the right or rising to the left based on the sign of the difference calculated by the calculation unit and the rotation direction of the drum;
A belt characteristic detecting device comprising:   6. The belt characteristic detecting apparatus according to claim 5, wherein the irradiation positions of the two points are separated from each other by 0.5 cm or more. An input unit in which whether the setting direction of the circumferential edge of the belt is rising to the right or rising to the left is input in advance;
A determination unit to which input data from the input unit is transmitted, and
The said determination part determines whether the direction of the circumferential edge of the said belt is normal or abnormal based on the signal from the said detection part, and the said input data. Belt characteristic detection device. An edge direction warning means for notifying the operator of an abnormality is provided,
8. The belt characteristic according to claim 7, wherein when the detected direction of the circumferential edge is different from the set direction, the determination unit transmits a signal to the edge direction warning means to operate. Detection device. The laser displacement meter measures the reflected light from at least one of the two irradiation positions over a predetermined circumferential length of the drum, whereby the maximum value in the radial direction of the drum outer peripheral surface is measured,
8. The determination unit determines that the belt has been applied each time a signal indicating that the belt application operation has been performed is received by increasing the maximum value by a belt thickness. Or the belt characteristic detection apparatus of 8. The drum outer peripheral surface is constituted by outer peripheral surfaces of a plurality of segments,
The belt characteristic detecting device according to claim 9, wherein the predetermined circumferential length is a length in a range from a circumferential length of an outer peripheral surface of one segment to a whole circumference of the drum. Attaching warning means to notify the operator of abnormalities,
If the maximum value does not increase by the belt thickness even if the signal indicating that the belt sticking operation has been performed is received, the determination unit transmits a signal to the sticking warning means to actuate the belt. The belt characteristic detecting device according to claim 9 or 10.

Images