JP2018012211A - Joint device for cord ply for tire and method of manufacturing cord ply for tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of variation in overlap amount in a joint portion of a tire cord ply after manufacturing by simply and accurately adjusting a descending position of a plate according to a state of a ply piece being conveyed. Provide the technology that can. SOLUTION: The plate is provided with a plate for pressing and fixing the vicinity of the tail end of a preceding ply piece from above, and a crimping means for pressing and joining the overlapping portions of two ply pieces, and the downstream side of the plate. The overlap amount detection sensor, the position adjustment mechanism that adjusts the descending position of the plate in the conveying direction of the ply piece, the overlap amount detection result by the overlap amount detection sensor, and the preset allowable value. In comparison, a joint device for a tire cord ply, comprising position adjusting control means for controlling the position adjusting mechanism to adjust the descending position of the plate when the detection result of the overlap amount deviates from the allowable value. [Selection diagram] Figure 2

Description

  TECHNICAL FIELD The present invention relates to a tire cord ply joint device used for manufacturing a tire cord ply and a tire cord ply manufacturing method using the joint device.

  In the manufacturing process of a pneumatic tire, a tire cord ply in which a plurality of cords arranged in parallel are covered with a topping rubber is used. This tire cord ply is made long by cutting an elongated top piece to produce a ply piece, and then performing an overlap joint that joins the ends of the cut ply pieces together. .

  FIG. 1 is a side view for explaining the manufacture of a tire cord ply. Specifically, first, as shown in FIG. 1 (a), the leading ply piece Wa is conveyed in the direction of arrow A until the tail end Wa1 of the preceding ply piece Wa exceeds the positioning portion 1, and then the ply piece as shown in FIG. 1 (b). Wa is reversed in the direction of arrow B, and the tail end Wa1 of the preceding ply piece Wa is abutted against the positioning portion 1 for positioning.

  Next, the plate 2 is lowered as shown in FIG. 1 (c) to fix the ply piece Wa, and then the subsequent ply piece Wb is conveyed as shown in FIG. 1 (d) to bring the tip Wb1 into contact with the plate 2. . Then, the overlapping portions of the two ply pieces Wa and Wb are pressure-bonded by using the pressure-bonding means 3 as shown in FIG. And the cord ply for tires is elongated by repeating the operations of FIGS.

  In manufacturing the tire cord ply, the operator adjusts the lowering position of the plate 2 shown in FIG. 1C in advance so that the two ply pieces Wa and Wb are overlapped. The amount is adjusted.

Japanese Patent No. 5801799 JP 2014-87956 A Japanese Patent No. 4616383

  However, in the manufacture of the tire cord ply described above, even if the lowering position of the plate 2 is the same, the amount of overlap may vary depending on the state of the ply piece being conveyed, waste material is generated, The uniformity of the tire after manufacture was deteriorated and it was discarded as a defective tire.

  Since the ply piece is produced by cutting the top anti-slip, if the top anti-type is changed, it is necessary to repeatedly adjust the lowering position of the plate until an appropriate overlap amount is obtained. In the meantime, an unstable amount of overlap may continuously occur and waste materials may be continuously generated.

  Therefore, the present invention simply and accurately adjusts the lowering position of the plate according to the state of the ply piece being conveyed, and suppresses the occurrence of variations in the overlap amount at the joint portion of the tire cord ply after manufacture. It is an object of the present invention to provide a technique that can be used.

The invention described in claim 1
A tire cord ply joint device for manufacturing a tire cord ply that is elongated by overlapping a tail end portion of a preceding ply piece and a tip portion of a succeeding ply piece,
A plate for pressing and fixing the vicinity of the tail end of the preceding ply piece from above and positioning the subsequent ply piece by contacting the tip of the subsequent ply piece;
A pressure-bonding means that presses and joins an overlap portion between the tail end portion of the preceding ply piece and the tip portion of the subsequent ply piece;
An overlap amount detection sensor that is disposed on the downstream side of the plate and detects the overlap amount of the jointed ply pieces;
A position adjusting mechanism for adjusting the lowering position of the plate in the conveying direction of the ply piece;
The detection result of the overlap amount by the overlap amount detection sensor is compared with a preset allowable value, and the position adjustment mechanism is controlled when the detection result of the overlap amount is out of the allowable value. And a position adjusting control means for adjusting the lowered position of the plate.

The invention described in claim 2
The position adjusting mechanism is
A motor connected to the position adjustment control means;
A trapezoidal screw that is attached to the motor and expands and contracts by driving the motor;
The tire cord ply joint device according to claim 1, further comprising: a plate holding member that holds the plate and moves along a conveying direction of the ply piece by expansion and contraction of the trapezoidal screw. is there.

The invention according to claim 3
The tire cord ply joint device according to claim 1, wherein an encoder that detects a rotational speed of the motor is attached to the motor.

The invention according to claim 4
4. The tire cord ply joint device according to claim 2, wherein a proximity sensor that detects expansion and contraction of the trapezoidal screw is provided on the plate holding member. 5.

The invention described in claim 5
A tail end sensor for detecting the position of the tail end of the preceding ply piece;
A tail that adjusts the position of the tail end of the preceding ply piece when the tail end portion of the preceding ply piece overlaps the tip end portion of the subsequent ply piece based on the detection result of the tail end sensor. The tire cord ply joint device according to any one of claims 1 to 4, further comprising an end adjusting means.

The invention described in claim 6
The position adjustment control means is a control means for adjusting the lowered position of the plate by controlling the position adjustment mechanism based on an average value of a plurality of detection results of the overlap amount. The tire cord ply joint device according to any one of claims 1 to 5.

The invention described in claim 7
The position adjustment control means is control means set so as to stop the operation of the apparatus when the detection result of the overlap amount is out of the allowable value. 7. The tire cord ply joint device according to any one of items 6 above.

The invention according to claim 8 provides:
The allowable value set in advance in the position adjustment control means is set to a width of ± 1 to 10 mm centering on the overlap amount as a target value. A tire cord ply joint device according to claim 1.

The invention according to claim 9 is:
A method for producing a tire cord ply for producing an elongated tire cord ply using the tire cord ply joint device according to any one of claims 1 to 8,
A ply piece fixing step of fixing the preceding ply piece by lowering and pressing down the plate near the tail end of the preceding ply piece;
By conveying the subsequent ply piece until the tip of the subsequent ply piece comes into contact with the lowered plate, the tail end portion of the preceding ply piece overlaps the front end portion of the subsequent ply piece. The overlap process;
A joint step of jointing by pressing the overlap portion between the tail end portion of the preceding ply piece and the tip portion of the subsequent ply piece by the pressure-bonding means,
When the position adjustment control means compares the detection result of the overlap amount by the overlap amount detection sensor with a preset allowable value, and the detection result of the overlap amount is out of the allowable value, A method for manufacturing a cord ply for a tire, wherein the position adjustment mechanism is controlled to adjust the lowered position of the plate.

  According to the present invention, the lowering position of the plate is easily and accurately adjusted according to the state of the ply piece being conveyed, and the occurrence of variation in the overlap amount in the joint portion of the tire cord ply after manufacture is suppressed. Technology that can be done can be provided.

It is a side view explaining manufacture of the cord ply for tires. It is a top view showing typically the joint device of the cord ply for tires concerning one embodiment of the present invention. It is a side view explaining the tail end detection sensor in the joint device of the cord ply for tires concerning one embodiment of the present invention. It is a graph which shows the measurement result of an Example and a comparative example.

  Hereinafter, the present invention will be described with reference to the drawings based on embodiments.

1. FIG. 2 is a plan view schematically showing the tire cord ply joint device according to the present embodiment. The lower side of the drawing is downstream in the conveying direction of the ply pieces Wa and Wb. On the side.

  The joint device according to the present embodiment basically has the same structure as the conventional device, and as shown in FIG. 1, presses and fixes the vicinity of the tail end Wa1 of the preceding ply piece Wa. At the same time, the plate 2 for positioning the succeeding ply piece Wb by bringing the tip Wb1 of the succeeding ply piece Wb into contact with each other and pressing and overlapping the overlapping portion between the tail end portion and the tip end portion of the two ply pieces. A crimping means 3 is provided. 2 is provided with an elevating mechanism (not shown), and is configured to elevate in a direction perpendicular to the paper surface of FIG.

  In the joint device according to the present embodiment, three overlap amount detection sensors 4a to 4c for detecting the overlap amount of the ply piece after the joint are provided on the downstream side of the plate 2, and the ply piece The position adjustment mechanism 10 for adjusting the lowering position of the plate 2 in the transport direction is provided, and the next lowering position of the plate 2 based on the detection results of the overlap amounts by the overlap amount detection sensors 4a to 4c. It is characterized in that it is provided with position adjustment control means (not shown) for performing feedback control for adjusting.

  In this way, by performing feedback control of controlling the lowering position of the next plate 2 based on the detection result of the overlap amount by the overlap amount detection sensors 4a to 4c, the state of the ply piece being conveyed is determined. Since the lowering position of the plate 2 can be easily adjusted with high accuracy, it is possible to reduce the occurrence of the variation of the overlap amount only once, thereby reducing the generation of waste material, and after the production. It can contribute to the improvement of tire uniformity.

2. Specific Structure of Characteristic Part of Present Embodiment Hereinafter, a structure related to feedback control of the lowered position of the plate, which is a characteristic of the joint device according to the present embodiment, will be described in detail.

(1) Overlap amount detection sensor As described above, the overlap amount detection sensors 4a to 4c are provided on the downstream side of the plate 2, and the ply after the joint that passes below the overlap amount detection sensors 4a to 4c. The overlap amount at the joint part of one piece is detected.

  In the present embodiment, three overlap amount detection sensors are provided along the width direction of the ply piece so as to detect the overlap amounts at both side edges and the center portion of the ply piece after the joint, respectively. It is configured.

  Conventionally, a sensor for inspecting the overlap amount of the ply piece is provided on the downstream side of the plate so that the operator can rework the joint part when a joint failure occurs. It can also be used as a wrap amount detection sensor.

(2) Position Adjustment Mechanism The position adjustment mechanism 10 according to this embodiment includes a plate holding member 8, a trapezoidal screw 7, and a motor 5. The plate holding member 8 holds the plate 2, and the plate holding member 8 and the motor 5 are connected via a trapezoidal screw 7. The position adjusting mechanism 10 can adjust the lowered position of the plate 2 by driving the motor 5 and rotating the trapezoidal screw 7 to move the plate holding member 8 forward and backward along the conveying direction of the ply piece. It is configured.

  In this embodiment, an encoder 6 is attached to the motor 5, and the drive status of the motor 5 is transmitted to the position adjustment control means. Also, a proximity sensor 9 is attached to the plate holding member 8, and the mechanical limit is not exceeded when the trapezoidal screw 7 is rotated by detecting the position of the plate holding member 8 with the proximity sensor 9. ing.

  In addition, this position adjustment mechanism may be provided in the both-sides edge part of the ply piece, In this case, the downward position of the plate 2 in a both-sides edge part can be adjusted independently.

(3) Position Adjustment Control Unit The position adjustment control unit is connected to the overlap amount detection sensors 4a to 4c and the motor 5 of the position adjustment mechanism 10, and the motor is based on the detection results of the overlap amount detection sensors 4a to 4c. By driving 5, feedback control of the lowered position of the plate 2 is performed.

  Specifically, the position adjustment control means compares the detection result of the overlap amount of the ply piece transmitted from the overlap amount detection sensors 4a to 4c with a preset allowable value of the overlap amount, and detects it. It is determined whether the result is within the allowable range.

  If the overlap amount detection result is not within the allowable range, the overlap amount of the two ply pieces Wa and Wb (see FIG. 1) will be within the allowable range in the next joint operation. In addition, the driving of the motor 5 of the position adjusting mechanism 10 is controlled to adjust the lowered position of the plate 2 in the transport direction.

  The adjustment of the lowering position of the plate 2 by the position adjustment control means may be performed each time the overlap amount detection sensors 4a to 4c detect the overlap amount of the ply, but the number of adjustments increases and the control becomes complicated. From the viewpoint of preventing this, it is preferable to adjust the lowered position of the plate based on the average value of a plurality of detection results at the timing when the overlap amount is detected a predetermined number of times (for example, 5 times).

  Further, the allowable value of the overlap amount set in the position adjustment control means can be appropriately changed according to the type of the ply piece to be jointed, but it is ± 1 to 10 mm around the overlap amount as the target value. The width is preferably set.

  The position adjustment control means automatically operates the apparatus when the detection result of the overlap amount transmitted from the overlap amount detection sensors 4a to 4c is out of the predetermined allowable range. It is preferably set to stop. Thereby, it is possible to prevent the tire cord ply having a problem in the overlap amount from being supplied to the next process.

(4) Tail end detection sensor Further, in the present embodiment, as shown in FIG. 3, the tail end detection sensor 11 that detects the tail end Wa1 of the preceding ply piece Wa, and the detection result of the tail end detection sensor 11 Is further provided with tail end adjusting means (not shown) for adjusting the position of the tail end Wa1 of the preceding ply piece Wa.

  Thus, when the tail end Wa1 of the preceding ply piece Wa is aligned with the positioning unit 1, the position of the tail end Wa1 of the ply piece Wa is detected by the tail end detection sensor 11, and the ply piece Wa of the ply piece Wa is detected based on the detection result. Since the backward movement of the ply piece Wa can be controlled so that the tail end Wa1 is accurately positioned in the positioning portion 1, the preceding ply piece Wa is positioned with high accuracy, and the variation in the overlap amount is more appropriately controlled. Can be prevented.

3. 2. Manufacturing method of tire cord ply according to the present embodiment Next, a manufacturing method of the tire cord ply according to the present embodiment using the joint device shown in FIG. 2 will be described.

  In the tire cord ply manufacturing method according to the present embodiment, first, the preceding ply piece and the succeeding ply piece are jointed in the same procedure as the conventional method shown in FIG.

  Specifically, after the preceding ply piece Wa is conveyed as shown in FIG. 1A, the tail end Wa1 of the ply piece Wa preceding the positioning unit 1 is moved backward as shown in FIG. After positioning the tail end Wa1 of the preceding ply piece Wa by abutting, the ply piece for lowering the plate 2 as shown in FIG. 1 (c) and fixing the preceding ply piece Wa with the plate 2 The fixing process is performed.

  Next, as shown in FIG. 1 (d), the subsequent ply piece Wb is conveyed until the tip Wb1 of the subsequent ply piece Wb contacts the plate 2, and the tail ends and the tips of the two ply pieces Wa and Wb are conveyed. An overlapping process for overlapping the part is performed.

  And the joint process which joins by pressing the overlap part of two ply pieces Wa and Wb using the crimping | compression-bonding means 3 is performed.

  Each of the above steps is the same as each step in the conventional method, but in the present embodiment, unlike the conventional method, the overlap amount of the joint portion of the ply pieces jointed by the above-described steps, As shown in FIG. 2, detection is performed by overlap amount detection sensors 4 a to 4 c provided downstream of the plate 2.

  Then, the overlap amount detection result is transmitted to the position adjustment control means, and the position adjustment control means determines whether or not the current overlap amount is appropriate by comparing it with a predetermined allowable value. If the detection result of the amount is out of the allowable range, feedback control of the lowered position of the plate 2 in the transport direction is performed before the lowering of the plate 2 shown in FIG. I do.

  For example, when the detection result of the overlap amount is less than the allowable value, a deviation amount between the detection result and the allowable value is calculated, and the plate 2 is moved downstream in the transport direction by the calculated deviation amount. Then, the motor 5 is driven to perform feedback control of the lowered position of the plate 2. This makes it possible to increase the overlap amount at the time of the next joint so as to approach the allowable value.

  On the other hand, when the detection result of the overlap amount exceeds the allowable value, similarly, the deviation amount between the detection result and the allowable value is calculated. Then, the plate 2 is moved to the upstream side in the transport direction by the calculated shift amount, and the overlap amount is reduced at the next joint to approach the allowable value.

  As described above, according to the present embodiment, the next lowering position of the plate 2 can be easily and accurately adjusted by feedback control based on the detection result of the overlap amount. Can improve the yield of materials and improve the uniformity of tires after manufacturing (especially prevention of dents caused by joints) to reduce defective tires. it can.

  Further, in the conventional apparatus, when the overlap amount varies, the apparatus is stopped and the operator performs the mechanical adjustment, which takes time for the adjustment and causes a reduction in production efficiency. However, in the present embodiment, the lowered position of the plate 2 can be easily and automatically adjusted, so that productivity can be improved in combination with reduction of defective tires.

  Hereinafter, the present invention will be described based on examples.

1. Example and Comparative Example (1) Example Using the joint device shown in FIG. 2, the ply piece was jointed 30 times while adjusting the lowered position of the plate by feedback control. In FIG. 2, three overlap amount detection sensors 4a to 4c are provided, but in this embodiment, the overlap amount detection sensor is disposed above both side edges of the ply pieces Wa and Wb. Only 4a, 4c were used.

  Moreover, in the present Example, the target value of the overlap amount was set to 5.0 mm, and the allowable range was set to 5.0 ± 1.0 mm (4.0 to 6.0 mm).

  The specific contents of the feedback control were set as shown in Table 1 below. In Table 1, X indicates the current lowering position of the plate upstream of the overlap amount detection sensor 4a, and Y indicates the current lowering position of the plate upstream of the overlap amount detection sensor 4c.

  As shown in Table 1, in the joint device of the example, for example, the average value of detection results for five times of the overlap amount detection sensor 4a exceeds 6.0 mm, and the average value of the overlap amount detection sensor 4c is 4. If the distance is less than 0 mm, the plate lowering position X upstream of the overlap amount detection sensor 4a is moved 0.5 mm upstream at the next joint, and the plate lowering position Y upstream of the overlap amount detection sensor 4c is moved. Feedback control of moving 1.0 mm downstream is performed.

(2) Comparative Example Ply piece joints were performed 30 times under the same conditions as in the example except that a conventional apparatus that does not perform feedback control of the plate lowering position was used.

2. Evaluation The amount of overlap of the ply pieces after the joint was visually measured. The results are shown in FIG. The horizontal axis in FIG. 4 indicates the overlap amount (mm) of the joint portion, and the vertical axis indicates the number (frequency) of the overlap amount. In FIG. 4, the overlap amount obtained in 30 joint portions. Is distributed.

  As shown in FIG. 4, in the comparative example using the conventional apparatus, the overlap amount varied in the range of 0 to 6.0 mm, but in the example in which the feedback control of the plate descending position was performed, 4.5 to The overlap amount within the range of 5.5 mm was obtained, and it was found that the variation in the overlap amount was suppressed.

  Moreover, when the average value of each overlap amount of an Example and a comparative example was computed, it will be 5.02 mm in an Example and 5.10 mm in a comparative example, and the direction of an Example is closer to a target value (5.0 mm). An average value was obtained.

  Furthermore, when the standard deviation of the overlap amount was calculated, it was 0.21 mm in the example and 0.38 mm in the comparative example. Therefore, in the example, the standard deviation is reduced by about 45% compared to the comparative example, and in the example in which the feedback control of the plate lowering position is performed, the variation in the overlap amount is appropriately suppressed. It could be confirmed.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Positioning part 2 Plate 3 Crimping means 4a, 4b, 4c Overlap amount detection sensor 5 Motor 6 Encoder 7 Trapezoid screw 8 Plate holding member 9 Proximity sensor 10 Position adjustment mechanism 11 Tail end detection sensor Wa Preceding ply piece Wa1 Preceding ply The tail end of the piece Wb The following ply piece Wb1 The tip of the succeeding ply piece b)

Claims (9)

A tire cord ply joint device for manufacturing a tire cord ply that is elongated by overlapping a tail end portion of a preceding ply piece and a tip portion of a succeeding ply piece,
A plate for pressing and fixing the vicinity of the tail end of the preceding ply piece from above and positioning the subsequent ply piece by contacting the tip of the subsequent ply piece;
A pressure-bonding means that presses and joins an overlap portion between the tail end portion of the preceding ply piece and the tip portion of the subsequent ply piece;
An overlap amount detection sensor that is disposed on the downstream side of the plate and detects the overlap amount of the jointed ply pieces;
A position adjusting mechanism for adjusting the lowering position of the plate in the conveying direction of the ply piece;
The detection result of the overlap amount by the overlap amount detection sensor is compared with a preset allowable value, and the position adjustment mechanism is controlled when the detection result of the overlap amount is out of the allowable value. And a position adjusting control means for adjusting the lowered position of the plate. The position adjusting mechanism is
A motor connected to the position adjustment control means;
A trapezoidal screw that is attached to the motor and expands and contracts by driving the motor;
2. The tire cord ply joint device according to claim 1, further comprising a plate holding member that holds the plate and moves along a conveying direction of the ply piece by expansion and contraction of the trapezoidal screw.   The joint device for a tire cord ply according to claim 1 or 2, wherein an encoder for detecting the number of rotations of the motor is attached to the motor.   4. The joint device for a tire cord ply according to claim 2, wherein a proximity sensor for detecting expansion and contraction of the trapezoidal screw is provided on the plate holding member. A tail end sensor for detecting the position of the tail end of the preceding ply piece;
A tail that adjusts the position of the tail end of the preceding ply piece when the tail end portion of the preceding ply piece overlaps the tip end portion of the subsequent ply piece based on the detection result of the tail end sensor. The tire cord ply joint device according to any one of claims 1 to 4, further comprising an end adjusting means.   The position adjustment control means is a control means for adjusting the lowered position of the plate by controlling the position adjustment mechanism based on an average value of a plurality of detection results of the overlap amount. The joint device for a tire cord ply according to any one of claims 1 to 5.   The position adjustment control means is control means set so as to stop the operation of the apparatus when the detection result of the overlap amount is out of the allowable value. Item 7. The tire cord ply joint device according to any one of Items 6 to 7.   The allowable value set in advance in the position adjustment control means is set to a width of ± 1 to 10 mm centering on the overlap amount as a target value. A joint device for a cord ply for tire according to claim 1. A method for producing a tire cord ply for producing an elongated tire cord ply using the tire cord ply joint device according to any one of claims 1 to 8,
A ply piece fixing step of fixing the preceding ply piece by lowering and pressing down the plate near the tail end of the preceding ply piece;
By conveying the subsequent ply piece until the tip of the subsequent ply piece comes into contact with the lowered plate, the tail end portion of the preceding ply piece overlaps the front end portion of the subsequent ply piece. The overlap process;
A joint step of jointing by pressing the overlap portion between the tail end portion of the preceding ply piece and the tip portion of the subsequent ply piece by the pressure-bonding means,
When the position adjustment control means compares the detection result of the overlap amount by the overlap amount detection sensor with a preset allowable value, and the detection result of the overlap amount is out of the allowable value, A method for manufacturing a cord ply for a tire, wherein the position adjustment mechanism is controlled to adjust the lowered position of the plate.

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