JP2012157975A - Method of forming belt ply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt ply capable of improving uniformity by minimizing the unevenness of rigidity in the circumferential direction without influencing the traveling performance of a tire.SOLUTION: By sequentially cutting a narrow strip-like cord-including tape with an arrangement body of tire cords embedded therein at an angle θ with respect to the length direction, parallelogram-like tape cut pieces are formed. By sequentially transferring the tape cut pieces to an alignment conveyer performing intermittent feed at a certain transfer pitch length P in the transfer direction equal to the cutting direction, the tape cut pieces are aligned by including intervals between side edges. By operating a conveyer arranged at the front end side in the transfer direction of the alignment conveyer at the same speed as that of a molding drum while pressing a transport surface of the conveyer against an outer peripheral surface of the molding drum, the tape cut piece alignment body on the conveyer part is transferred and stuck to the outer peripheral surface of the molding drum.

Description

  The present invention relates to a method for forming a belt ply capable of forming a belt ply for one tire with high quality using N pieces of tape cut pieces that are cut from a long narrow strip-like corded tape. .

  In recent years, for example, as conceptually shown in FIG. 7, an unvulcanized cord-containing tape b having a narrow band shape in which an array of tire cords aligned in parallel with each other is rubber-coated is provided from the front end in the longitudinal direction. The parallelogram-shaped tape cut pieces b1 are sequentially formed by cutting at an angle θ (usually 10 to 35 degrees) with respect to the length direction and a length Lc corresponding to the width of the belt ply. There has been proposed a technique for forming a belt ply c for one tire by sequentially overlapping and connecting N pieces of cut pieces b1 between the non-cut side edges.

  In this technology, since a belt ply c suitable for the width of the tire to be produced and the belt cord angle can be formed for each tire and supplied to the forming drum by using one type of corded tape b, the stock of intermediate members is available. Tires can be prevented, and tires with a strong tendency to produce a variety of products in small quantities can be produced efficiently.

  And in the following Patent Document 1, it is proposed to adjust the angle θ within an allowable tolerance (Δθ) so that the circumferential length of the belt ply c matches the circumferential length of the forming drum. That is, by changing the angle θ from, for example, θ0 to θ0 + Δθ, the circumferential width wa of each tape cut piece b1 can be changed to wa × sin θ0 / sin (θ0 + Δ0), and can be applied to tires having different diameters. It is said.

  However, in the above proposal, the belt cord angle changes although it is within the tolerance, which may cause an influence on the running performance of the tire. In addition, since the tape cut pieces b1 are overlapped and connected, there is a problem that rigidity is increased at the overlapping portion and uniformity is lowered.

JP 2004-18187 A

  Therefore, the present invention does not connect the tape cutting pieces to each other, but aligns them on the conveyor at intervals, and operates while pressing the conveying surface of the conveyor against the outer peripheral surface of the forming drum. A belt that can improve the uniformity without affecting the running performance of the tire and minimizing the uneven rigidity in the circumferential direction, based on transferring the body to the outer peripheral surface of the forming drum and attaching it. It aims at providing the formation method of a ply.

In order to solve the above-mentioned problems, the invention of claim 1 of the present application is a narrow band-shaped unvulcanized belt-shaped array in which tire cord arrays aligned in parallel to each other are covered with rubber and both side edges are parallel to the tire cord. Tape loading process for loading corded tape in the length direction by a conveyor
The corded tape to be loaded is cut at each cutting length from the front end in the length direction, both ends in the length direction are cut edges inclined at an angle θ with respect to the length direction, and both sides in the width direction are on the side A cutting step of sequentially forming parallelogram-shaped tape cutting pieces as edges;
The cut pieces of tape that have been cut extend in the transfer direction that intersects the transport conveyor at an angle equal to the angle θ, and are sequentially transferred onto an alignment conveyor that intermittently feeds the transfer direction at a constant transfer pitch length P in the transfer direction. By doing so, the side edge on the rear end side in the transfer direction of the tape cut piece transferred to the alignment conveyor and the side edge on the front end side in the transfer direction of the tape cut piece to be transferred next are not joined to each other. A cutting piece aligning step for aligning the tape cutting pieces with a gap therebetween,
And the said alignment conveyor has the conveyor part which mounts the cutting piece alignment body for one tire which consists of N pieces of tape cutting pieces in the transfer direction front end side,
And by operating the conveyor unit at a transfer speed equal to the peripheral speed of the molding drum while pressing the conveying surface of the conveyor unit against the outer peripheral surface of the molding drum, the tape cut piece alignment body on the conveyor unit is While performing a transfer pasting process to transfer and paste to the outer peripheral surface,
The transfer pitch length P satisfies the following expressions (1) and (2).
P = L / N --- (1)
L / W>N> L / W-1 (2)
(In the formula, L is the circumferential length of the forming drum, and W is the width of the tape cut piece in the transfer direction.)

  According to a second aspect of the present invention, the conveyor portion of the alignment conveyor is tilted up and down on the front end side in the transfer direction by the rear end side in the transfer direction being pivotally supported by an axis parallel to the drum axis of the forming drum. In addition, the transfer sticking step is performed by pressing the conveying surface against the outer peripheral surface of the forming drum by this tilting.

  According to a third aspect of the present invention, the distance is 1.0 mm or less.

  In the present invention, as described above, the tape cut pieces cut at an angle θ from the unvulcanized corded tape having a narrow band shape are sequentially transferred onto an alignment conveyor that intermittently feeds at a constant transfer pitch length P. Therefore, the side edge on the rear end side in the transfer direction of the tape cut piece transferred to the aligning conveyor and the side edge on the front end side in the transfer direction of the tape cut piece to be transferred next are spaced apart without joining. A cutting piece aligning step for aligning the tape cutting pieces apart from each other, and operating the conveyor unit at a transfer speed equal to the peripheral speed of the forming drum while pressing the conveying surface of the conveyor unit of the aligning conveyor against the outer peripheral surface of the forming drum. The transfer sticking process which transfers and affixes the tape cutting piece alignment body on the said conveyor part to the outer peripheral surface of a forming drum is included.

  That is, the tape cut pieces on the aligning conveyor are aligned at intervals without being joined, and the tape cut piece alignment body on the aligning conveyor is pressed against the outer peripheral surface of the forming drum to be transferred. A belt ply made of an aligned tape cut piece is formed on the surface.

  By adjusting the interval between the tape cut pieces, this can form a belt ply suitable for the circumference of the forming drum, and can be applied to tires having different diameters. That is, since the cutting angle of the corded tape is not adjusted, the belt cord angle can be set constant. Further, in the present invention, the tape cut pieces are not sequentially connected to form a single belt ply, so that no overlapping portion is formed between the tape cut pieces. Therefore, it is possible to suppress nonuniform rigidity due to the overlapping portion. Note that the change in rigidity due to the interval is smaller than the change in rigidity due to the overlapping portion, and the interval is minimized by satisfying the equations (1) and (2) to make the interval smaller than W / N. Can be limited. Therefore, the uniformity can be improved without affecting the running performance of the tire and minimizing the uneven rigidity in the circumferential direction.

It is a top view which shows an example of the belt ply formation apparatus for enforcing the formation method of the belt ply of this invention. It is a side view which shows the one part. It is a perspective view which shows a cutting device notionally. It is a perspective view explaining transfer to the alignment conveyor of a tape cut piece. (A) is a side view showing an alignment conveyor, and (B) is a partially enlarged view showing transfer onto a forming drum by the alignment conveyor. (A) is a top view which shows a corded tape, (B) is a top view which shows a tape cut piece. It is explanatory drawing which shows the formation method of the conventional belt ply.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a plan view showing an example of a belt ply forming apparatus for carrying out the belt ply forming method of the present invention.

  As shown in FIG. 1, the belt ply forming apparatus 1 includes a transport conveyor 2 that transports a narrow band-like unvulcanized corded tape S in the length direction F, and a cord that is transported into the transport conveyor 2. A cutting device 3 that cuts the tape S from the front end in the length direction F to sequentially form the tape cut pieces S1, and the tape cut pieces S1 that have been cut are sequentially transferred onto the aligning conveyor 4 and the tape cut piece alignment body RS. , A transfer drum 5, the alignment conveyor 4, and a forming drum 6 to which the tape cut piece RS on the alignment conveyor is transferred.

  In the cord-containing tape S, as shown in FIG. 6A, an array of tire cords 10 aligned in parallel to each other is covered with rubber with a topping rubber G, and both side edges E1 are parallel to the tire cord 10. Forms a narrow band. The corded tape S is supplied from the supply means 7 to the conveyor 2.

  As the supply means 7, in this example, a tape forming device 8 installed on the upstream side of the transport conveyor 2 via a festoon 9 is employed. The tape forming apparatus 8 includes a cord stand 8A that supplies a plurality of tire cords 10 aligned in parallel, and a rubber extruder 8B that forms a cord-containing tape S by rubberizing the supplied tire cords. Is done. In addition, it can replace with the said tape formation apparatus 8 as the supply means 7, and can also use the roll stand which hold | maintains the roll roll of the cord-containing tape S formed previously so that the cord-containing tape S can be rewound from this roll roll. .

  The conveyor 2 is a belt conveyor, and includes a series of upstream conveyors 2A and a downstream conveyor 2B that can be connected to each other, and the cutting device 3 is disposed between the conveyors 2A and 2B. .

  The cutting device 3 cuts the corded tape S from the front end in the length direction F for each cutting length K at a cutting position between the conveyors 2A and 2B. As a result, as shown in FIG. 6 (B), both sides of the lengthwise direction are cut edges E2 inclined at an angle θ with respect to the lengthwise direction F, and parallelogram-shaped tapes having both sides in the widthwise direction being the side edges E1. Cut pieces S1 are sequentially formed. As conceptually shown in FIG. 3, the cutting device 3 of this example has a support shaft 13 pivoted vertically on an upper frame member 12 </ b> U of the portal frame 12 straddling the transport conveyor 2. The support shaft 13 is connected to a motor M1 fixed to the upper frame member 12U via a transmission means 14 using, for example, a gear, and the lower end thereof travels the cutter 11 via a guide means 15. It is attached freely. The guide means 15 includes a guide rail 16 having a guide groove 16A, and a traveling piece 17 that can travel horizontally along the guide groove 16A. A lower end of the cutter holder 18 extending from the traveling piece 17 has, for example, a disc. A cylindrical cutter 11 is pivotally mounted along the running direction. The traveling piece 17 can travel by a motor M2 fixed to the guide rail 16.

  Therefore, the cutting device 3 can adjust the direction of the guide rail 16 by the operation of the motor M1, and can appropriately set the cutting angle θ of the cutter 11 according to the tire category. Note that the cutter 11 may be a guillotine-shaped pressing blade that descends and pushes the corded tape S. In such a case, a cylinder or the like can be suitably used as a lifting tool for moving the cutter 11 up and down. The conveyor 2 is provided with adjusting means (not shown) for adjusting the cutting length K by controlling the feed amount from the cutting position to the conveyor 2B.

  Next, as shown in FIGS. 2 and 4, the transfer tool 5 receives the tape cut piece S <b> 1 at the receiving position Q <b> 1 on the conveyor 2 </ b> B and transfers it to the transfer position Q <b> 2 on the alignment conveyor 4. Specifically, the transfer tool 5 of this example is a transfer conveyor 21 extending in the longitudinal direction F through the conveyor 2B and the alignment conveyor 4, and can be moved up and down to the frame 19 via the lifting means 20. Arranged. In this example, the transfer conveyor 21 is a belt conveyor with the conveying surface 21S facing downward, and a magnet (not shown) attached to the inner peripheral surface side of the conveyor belt attracts the tape cut pieces S1 on the lower surface of the conveyor belt. Then, it can be conveyed in the length direction F.

  The transfer conveyor 21 can suck and receive the tape cut piece S1 from the conveyor 2B in a descending state in which the transport surface 21S is substantially the same height as the upper surface of the tape cut piece S1 on the conveyor 2B. Thereafter, the transfer conveyor 21 can move up and be separated from the conveyor 2B, and then can transport the adsorbed tape cut piece S1 to a position above the transfer position Q2.

  Thereafter, the transfer conveyor 21 descends, and the adhering tape cut piece S1 is delivered to the alignment conveyor 4 at the transfer position Q2 on the alignment conveyor 4. In this example, the transfer is performed by moving the magnet away from the inner surface of the belt with a cylinder or the like and releasing the adsorption to the tape cutting piece S1, but the magnet is formed of an electromagnet and energized. It may be turned off and on.

  In this example, the elevating means 20 rises from the upper surface of the transfer conveyor 21 and an elevating tool 20A such as a cylinder fixed to the upper plate 19A of the frame 19 and having the transfer conveyor 21 attached to the lower end of the rod. And the case where it comprises from the guide shaft 20B inserted in the guide hole 19B provided in the said upper board 19A is illustrated.

  Next, as shown in FIG. 1, the alignment conveyor 4 is a conveyor extending along the transfer direction J that intersects the transport conveyor 2 at an angle α equal to the angle θ. It comprises a first conveyor section 4A on the end side and a second conveyor section 4B on the front end side in the transfer direction that is arranged to be connected to the first conveyor section 4A.

  The conveying surface of the first conveyor unit 4A is the same height as the conveying surface of the conveyor 2B of the conveying conveyor 2, and the conveying surface is intermittently fed in the transfer direction J at a constant transfer pitch length P. sell. The transfer pitch length P is larger than the width W of the tape cutting piece S1 in the transfer direction, and therefore the first conveyor unit 4A is the tape cutting unit that has been transferred to the first conveyor unit 4A first. The tape cut pieces S1 are aligned at a distance D without joining the side edge E1 on the rear end side in the transfer direction of the piece S1 and the side edge E1 on the front end side in the transfer direction of the tape cut piece S1 to be transferred next. be able to.

  The second conveyor portion 4B has a length for mounting the tape cut piece alignment body RS for one tire including the N pieces of tape cut pieces S1. As shown in FIG. 5 (A), the second conveyor portion 4B has a front end in the transfer direction by being pivotally supported by an axis 4i parallel to the drum axis 6i of the forming drum 6. Can tilt side up and down. In this example, the conveying surface 4BS is pressed from the pressing state Y1 that presses the conveying surface 4BS of the second conveyor unit 4B against the outer peripheral surface of the forming drum 6 by being biased upward by the operation of the cylinder 30. It is possible to tilt to a standby state Y2 in which it waits apart from the outer peripheral surface.

  By operating the second conveyor unit 4B at a transfer speed V2 equal to the peripheral speed V1 of the molding drum 6 while pressing the conveying surface 4BS of the second conveyor unit 4B against the outer peripheral surface of the molding drum 6, FIG. As shown in FIG. 5B, the tape cut piece alignment body RS on the second conveyor section 4B can be transferred and pasted to the outer peripheral surface of the forming drum 6.

  That is, a belt ply made of the tape cut piece alignment body RS can be formed on the forming drum 6. The forming drum 6 is a drum for forming a tread, and the tread components such as a belt ply, a band ply, and a tread rubber are sequentially pasted around the forming drum 6 and stacked. A tread ring for forming a portion can be formed.

  Next, the belt ply forming method of the present invention includes a tape carry-in process, a cutting process, a cut piece alignment process, and a transfer sticking process.

  The tape carrying-in process and the cutting process are the same conventional processes, and in the tape carrying-in process, the corded tape S is carried in the length direction F by the transport conveyor 2. In the cutting step, the loaded corded tape S is cut from the front end in the length direction F for each cutting length K, and parallelogram shaped tape cut pieces are sequentially formed.

  In the cut piece alignment step, the transfer conveyor 21 is used to receive the cut tape cut piece S1 at the receiving position Q1 on the conveyor 2B and move to the transfer position Q2 on the first conveyor section 4A. Change. At this time, each time the transfer is performed, the first conveyor unit 4A intermittently feeds the tape cut piece P1 transferred at a transfer pitch length P larger than the width W of the tape cut piece S1 in the transfer direction. The tape cut piece S1 is aligned with a gap D without joining the side edge E1 on the rear end side in the transfer direction of S1 and the side edge E1 on the front end side in the transfer direction of the tape cut piece S1 to be transferred next. Can do. In this example, when the cut piece alignment body RS for one tire composed of N tape cut pieces S1 is formed on the first conveyor portion 4A, the cut piece alignment body RS is used as the second conveyor portion. Transfer to 4B.

  In the transfer sticking step, the second conveyor unit 4B is operated at a transfer speed V2 equal to the peripheral speed V1 of the molding drum 6 while pressing the conveying surface 4BS of the second conveyor unit 4B against the outer peripheral surface of the molding drum 6. By doing so, the tape cut piece alignment body PS on the second conveyor unit 4B is transferred to the outer peripheral surface of the forming drum 6 and attached.

At this time, the transfer pitch length P needs to satisfy the following expressions (1) and (2).
P = L / N --- (1)
L / W>N> L / W-1 (2)

  Here, the symbol L is the circumference of the forming drum 6 and is determined by the diameter of the tire to be formed. Symbol W is the width of the tape cut piece S1 in the transfer direction, and is set to be constant. Therefore, the number N of the tape cut pieces S1 for forming the cut piece alignment body RS for one tire can be set by the formula (2), and the transfer pitch length at that time can be set from the formula (2). P can be set.

  That is, in this belt ply forming method, the belt ply suitable for the circumferential length L of the forming drum can be formed by adjusting the distance D between the tape cut pieces S1, and the belt ply can be applied to tires having different diameters. be able to. Further, since the belt ply formed by this method does not form an overlapping portion between the tape cut pieces, it is possible to suppress nonuniform rigidity due to the overlapping portion. Note that the change in rigidity due to the distance D is smaller than the change in rigidity due to the overlapping portion, and by satisfying the equations (1) and (2), the distance D is less than W / N. It can be kept in. Therefore, the uniformity can be improved without affecting the running performance of the tire and minimizing the uneven rigidity in the circumferential direction. In order to improve uniformity, the distance D is preferably smaller than 1.0 mm.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

2 Conveyor 4 Alignment conveyor 4B Conveyor section 6 Forming drum 10 Tire code D Interval E1 Side edge E2 Cutting edge F Length direction J Transfer direction K Cutting length RS Cutting piece alignment body S Corded tape S1 Tape cutting piece

Claims (3)

Tape carry-in, in which an array of tire cords aligned in parallel with each other is covered with rubber, and a non-vulcanized cord tape with a narrow band shape whose both side edges are parallel to the tire cord is carried in the length direction by a conveyor. Process,
The corded tape to be loaded is cut at each cutting length from the front end in the length direction, both ends in the length direction are cut edges inclined at an angle θ with respect to the length direction, and both sides in the width direction are on the side A cutting step of sequentially forming parallelogram-shaped tape cutting pieces as edges;
The cut pieces of tape that have been cut extend in the transfer direction that intersects the transport conveyor at an angle equal to the angle θ, and are sequentially transferred onto an alignment conveyor that intermittently feeds the transfer direction at a constant transfer pitch length P in the transfer direction. By doing so, the side edge on the rear end side in the transfer direction of the tape cut piece transferred to the alignment conveyor and the side edge on the front end side in the transfer direction of the tape cut piece to be transferred next are not joined to each other. A cutting piece aligning step for aligning the tape cutting pieces with a gap therebetween,
And the said alignment conveyor has the conveyor part which mounts the cutting piece alignment body for one tire which consists of N pieces of tape cutting pieces in the transfer direction front end side,
And by operating the conveyor unit at a transfer speed equal to the peripheral speed of the molding drum while pressing the conveying surface of the conveyor unit against the outer peripheral surface of the molding drum, the tape cut piece alignment body on the conveyor unit is While performing a transfer pasting process to transfer and paste to the outer peripheral surface,
The transfer pitch length P satisfies the following expressions (1) and (2), and the belt ply forming method is characterized by:
P = L / N --- (1)
L / W>N> L / W-1 (2)
(In the formula, L is the circumferential length of the forming drum, and W is the width of the tape cut piece in the transfer direction.)   The conveyor portion of the aligning conveyor is tilted up and down on the front end side in the transfer direction by pivoting the rear end side in the transfer direction on an axis parallel to the drum axis of the forming drum. 2. The method of forming a belt ply according to claim 1, wherein the transfer sticking step is performed by pressing the surface against the outer peripheral surface of the forming drum.   The method for forming a belt ply according to claim 1, wherein the interval is 1.0 mm or less.

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