JP2016215584A - Method of forming ply for tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form at high accuracy, a ply for tire using a strip including the cord rewound from a reel.SOLUTION: A ply 6 for tire is formed by sequentially cutting a strip W including a cord rewound from a reel 3 and setting out cut pieces W1 on an outer peripheral face Ds of a drum D to stick thereon. The cord-including strip W is rewound from the reel 3 in a direction in which a first surface S1 of an outer peripheral side in a reel-winding state becomes an upper side toward the drum D. In a storage process K2, a twist Q is applied to the cord-including strip W, and the first and second surfaces S1 and S2 invert to be transferred to a sticking process K3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for forming a tire ply that can form a tire ply such as a belt ply with high accuracy using a corded strip unwound from a reel.

  Patent Document 1 below proposes a method of forming a belt ply on the outer peripheral surface of a drum, which is a rigid core, for example, using a tape-like cord-containing strip. In this proposed method, as shown in FIG. 9A, the cord-incorporated strip W that has been rewound from the reel a is supplied to the affixing device C via the U-shaped reservoir b. In the affixing device C, the supplied cord-incorporated strip W is sequentially cut from the front end side by the cutting means C1, and the cut pieces W1 are sequentially arranged and affixed in the drum circumferential direction on the drum outer peripheral surface Ds, thereby the belt ply Is forming.

  At this time, as shown in FIG. 10, the cutting piece W1 is fed from the conveying means C2 of the sticking device C toward the drum D in the horizontal direction and in the tangential direction of the drum outer peripheral surface Ds. This is preferable for smoothly attaching to the surface Ds.

  However, the sending portion W1a of the cut piece W1 sent out from the conveying means C2 inevitably hangs down due to its own weight. In addition, when the cord is a metal cord, the cord-incorporated strip W has a curl whose surface on the outer peripheral side (first surface) is convexly curved in the reel winding state. Therefore, this curl is added, and the amount of sag δ from the tangent of the delivery part W1a becomes even larger.

  As a result, there arises a problem that the attaching accuracy is lowered, for example, the leading end of the cut piece W1 strongly collides with the drum outer peripheral surface Ds to cause deformation, or the attaching position of the leading end deviates more than the contact position.

  Here, the increase in the amount of sag δ due to the curl is based on the following reason. As shown in FIG. 9A, generally, the cord-incorporated strip W is wound from the reel a in such a direction that the surface (first surface) on the outer peripheral side in the reel winding state is the upper side toward the drum D. Returned. The reason for this is that a release tape E for preventing adhesion between the strips is adhered to the inner peripheral surface (second surface) of the corded strip W, and this stripped tape E is used as the corded strip. In order to peel off and collect from W, it is necessary to rewind the corded strip W in the above-described direction. Then, the cord-incorporated strip W that has been rewound in the above-described direction is supplied to the affixing device C as it is, so that the curl is in the same direction as the droop and the droop amount δ increases.

  As shown in FIG. 9B, when the second surface (inner peripheral surface) is rewound from the reel a in a direction toward the upper side toward the drum D, the curl is reversed. However, it is necessary to provide the recovery reel f of the peeling tape E on the upper side of the corded strip W, so that the space cannot be effectively used. Moreover, since the force of the direction which floats from the guide roller g acts on the strip W with a cord at the time of peeling, the problem that it will come off from the guide roller g or it will become easy to meander in the width direction also arises.

JP 2014-69563 A

  Therefore, the invention can reduce the amount of sag of the feeding portion by using the winding strip of the corded strip while suppressing the effective use of the space of the reel stand and the stripping of the corded strip from the guide roller. It is an object of the present invention to provide a method for forming a tire ply that can form a ply with high accuracy.

The present invention sequentially cuts tape-shaped cord-containing strips in which metal cords aligned in the length direction are covered with rubber from the tip side, and on the drum outer peripheral surface, each cut piece is arranged in the drum circumferential direction. It is a method of forming a ply for a tire by sticking side by side,
A strip supplying step of rewinding the cord-containing strip from a reel held by a reel stand, and feeding it from a feed roller of the reel stand;
Receiving the fed corded strip with a receiving roller and sequentially cutting into a predetermined length of cut pieces;
A step of attaching the cut piece to the outer peripheral surface of the drum in a horizontal direction and in a tangential direction of the outer peripheral surface of the drum;
And a storing step of storing the corded strip in a U shape between the feeding roller and the receiving roller.
Moreover, in the strip supplying step, the cord-containing strip is oriented in such a manner that the first surface on the outer peripheral side is the upper side toward the drum and the second surface on the inner peripheral side is the lower side toward the drum in the reel winding state. And then rewind from the reel,
In the storage step, the cord-containing strip is twisted, and the first surface and the second surface are reversed and delivered to the receiving roller.

  In the method for forming a tire ply according to the present invention, the cord-containing strip is cut obliquely at an angle θ with respect to its length direction, and the cut piece has its length direction with respect to the drum circumferential direction. It is preferable that the drums are affixed side by side in the drum circumferential direction while being inclined at an angle equal to the angle θ.

  In the method for forming a tire ply according to the present invention, it is preferable that the strip supplying step does not perform curl removal processing for removing curl by repeatedly folding the corded strip up and down.

  As described above, according to the present invention, in the strip supplying step, the cord-containing strip is rewound from the reel in such a direction that the first surface on the outer peripheral side is on the upper side toward the drum in the reel winding state. Therefore, as in the prior art, the recovery reel for the release tape can be provided below the corded strip, and the space can be effectively utilized. Moreover, since the force of the direction which presses a code | cord | peel strip to a guide roller acts at the time of peeling, detachment | leave from a guide roller, meandering, etc. can be suppressed.

  In the storage process, the cord-containing strip is twisted to invert the first surface and the second surface. For this reason, the curl of the corded strip is upside down. That is, at the stage where the cut piece is sent out, the direction of the curl is opposite to the direction of drooping due to gravity. As a result, it is possible to reduce the amount of sag of the cut-out portion of the cut piece and improve the accuracy of attaching the cut piece.

It is a conceptual diagram which shows one Example of the formation method of the ply for tires of this invention. It is a perspective view which shows the strip with a cord wound by the reel. It is a side view which shows a reel stand. It is a perspective view which shows the twist of the corded strip in a storage process. It is a side view which shows a sticking apparatus. (A), (B) is a perspective view which shows a cutting piece and a belt ply. It is a side view which expands and shows the front-end | tip part of a sticking apparatus. (A) is a side view explaining the effect of this invention, (B), (C) is a side view of a comparative example. (A) is a schematic side view showing the prior art, and (B) is a schematic side view showing a problem when the reel is mounted in the reverse direction. It is a side view which shows the problem of a prior art.

Hereinafter, embodiments of the present invention will be described in detail.
As conceptually shown in FIG. 1, the tire ply forming method of the present invention includes a strip supplying step K1, a storing step K2, and a pasting step K3.

  In the strip supply process K 1, the cord-containing strip W is rewound from the reel 3 held on the reel stand 2 and sent out from the feed roller 4 of the reel stand 2.

  In the pasting step K3, using the pasting device 5, the fed cord-containing strip W is sequentially cut from the tip side to form the cut pieces W1, and each cut piece W1 on the drum outer peripheral surface Ds in the drum circumferential direction. Paste them in order. Thereby, the tire ply 6 is formed. In this example, a case where a belt ply is formed as the tire ply 6 is shown.

  In the storage step K2, the corded strip W is suspended in a U shape between the reel stand 2 and the affixing device 5 and temporarily stored. Thereby, adjustment of the timing of strip supply process K1 and sticking process K3 is achieved.

  As shown in FIG. 2, the cord-containing strip W of this example has a tape shape in which a metal cord 7 aligned in the length direction is covered with rubber. The corded strip W is manufactured, for example, in a separate line having a rubber extruder, and is introduced into the tire ply forming line while being wound around the reel 3. At the time of winding on the reel 3, the peeling tape E is adhered to the second surface S2 on the radially inner peripheral side, and the sticking between the strips is prevented. When this cord-incorporated strip W is rewound from the reel 3, a curl in which the first surface S1 on the outer peripheral side is curved in a convex shape (the second surface S2 is concave) inevitably occurs.

  As shown in FIG. 3, the reel stand 2 of this example includes a support shaft 8A that rotatably holds the reel 3 and a plurality of guide rollers 8B, and a guide roller 8B that is disposed on the foremost side in the transport direction. Constitutes the feed roller 4. Then, the corded strip W is rewound from the reel 3 in such a direction that the first surface S1 on the outer peripheral side is on the upper side toward the drum D. “The first surface S1 is on the upper side toward the drum D” means that the first surface S1 is on the upper side in a portion where the corded strip W is conveyed in a direction (X direction) approaching the drum D. means.

  By being rewound in this direction, the second surface S <b> 2 to which the peeling tape E is attached becomes the lower side toward the drum D. As a result, the peeling tape collecting reel 9 can be arranged below the reel stand 2 and the space can be effectively used. Further, when the release tape E is peeled from the corded strip W, a force in a direction (downward in this example) can be applied to the corded strip W against the guide roller 8B. Detachment and meandering can be suppressed.

  Next, as shown in FIGS. 3 and 4, in the storage step K <b> 2, twist Q is applied to the cord-containing strip W, and the first surface S <b> 1 and the second surface S <b> 2 are reversed to receive rollers of the pasting device 5. 10 is passed. That is, the corded strip W is delivered to the affixing device 5 with the second surface S2 facing upward.

  As shown in FIG. 5, the affixing device 5 of this example includes an actuator 14 including the receiving roller 10, a conveying unit 11, a cutting unit 12, and an affixing unit 13. The actuator 14 of this example is supported by a side frame 16 that is attached to the lifting platform 15. The receiving roller 10 is a roller disposed on the rearmost side in the conveying direction, and receives the cord-containing strip W from the storage step K2 with the second surface S2 facing upward, and in this state Guide to the transport means 11.

  In the present example, the transport means 11 includes a lower conveyor portion 11L and an upper conveyor portion 11U. The lower conveyor portion 11L has a conveyor belt 18 guided by a plurality of lower guide rollers 17 so as to be able to go around. Further, the upper conveyor unit 11U has a pressing belt 20 guided by a plurality of upper guide rollers 19 so as to be able to go around. The cord-containing strip W or its cut piece W1 is conveyed by being sandwiched between a conveying surface 18S which is the upper surface of the conveying belt 18 and a pressing surface 20S which is the lower surface of the pressing belt 20. The conveyor belt 18 and the pressing belt 20 are driven at the same speed in synchronization with each other.

  The upper conveyor part 11U is divided into a conveyor part 11UR on the rear side in the conveying direction and a conveyor part 11UF on the front side, and a cutting means 12 is arranged between the conveyor parts 11UR and 11UF. The cutting means 12 sequentially cuts the corded strip W transported on the transport surface 18S from the front end side into a cut piece W1 having a predetermined length. As the cutting means 12, a known structure can be adopted.

  In this example, as shown in FIGS. 6A and 6B, the cord-containing strip W is cut obliquely at an angle θ with respect to its length direction. Then, the belt plies (tire plies 6) are formed by sticking the cut pieces W1 side by side in the drum circumferential direction while inclining the length direction thereof at an angle α equal to the angle θ with respect to the drum circumferential direction. .

  As shown in FIGS. 5 and 7, the conveyance surface 18S of this example extends in a substantially horizontal straight line, and the virtual extension line J of the conveyance surface 18S substantially contacts the drum outer circumferential surface Ds. Therefore, the conveying unit 11 can send the cut piece W1 horizontally toward the drum outer peripheral surface Ds and in the tangential direction of the drum outer peripheral surface Ds. Note that “substantially horizontal” means a range in which the inclination with respect to the horizontal line is 15 degrees or less. The transport surface 18S is maintained in a substantially horizontal straight line by the receiving plate portion 22 that receives the lower surface of the forward traveling portion of the transport belt 18.

  In the present invention, as shown in FIG. 4, twist Q is applied to the corded strip W in the storage step K2, and the first surface S1 and the second surface S2 are reversed and delivered to the receiving roller 10. Therefore, the cut piece W1 is conveyed with the second surface S2 facing upward and is sent out to the drum D side. That is, as shown in FIG. 8A, the curl of the cut piece W1 is in a direction in which the tip side warps upward. Therefore, the curl can be made to oppose gravity, and as shown by the alternate long and short dash line in the figure, in the part where the cut piece W1 is sent out from the transport surface 18S (hereinafter referred to as “sending part W1a”). The sagging amount δ (the sagging amount δ from the virtual extension line J) can be reduced. When the curl is stronger than gravity, the amount of sag δ is negative, that is, the sending portion W1a may be lifted above the virtual extension line J. In this case, the absolute value of δ is It becomes small by the amount and can approach the virtual extension line J. As a reference, FIG. 8B shows a conventional case (first surface S1 faces upward), and FIG. 8C shows a drooping of the sending portion W1a when there is no curl. In any case, the sagging amount δ is large.

  As shown in FIG. 7, the affixing means 13 includes a pressing roller 13 </ b> A that affixes the cut piece W <b> 1 sent out against the drum outer peripheral surface Ds. The attaching means 13 of this example includes a cylinder 13B attached to the side frame 16 via an arm 23, and the pressing roller 13A pivotally supported via a roller holder at the lower end of the rod. The pressing roller 13A can move up and down at a position near the contact point P between the virtual extension line J and the drum outer peripheral surface Ds, and can lower the cut piece W1 to the drum outer peripheral surface Ds.

  In the transport unit 11 of this example, the pressing surface 20S of the pressing belt 20 includes an overhanging portion 20Sa that protrudes forward in the transport direction from the transport surface 18S. The overhanging portion 20Sa has a strong curl, and even when the feeding portion W1a is about to be lifted above the virtual extension line J, the overhanging portion 20Sa can suppress the lifting, and the cutting piece W1 is pressed. Strong collision with the roller 13A can be mitigated.

  In this way, the present invention suppresses the drooping of the sending portion W1a (displacement from the virtual extension line J) by using the winding habit of the corded strip generated by the reel winding. Therefore, for example, in the strip supply step K1, etc., it is preferable not to perform the curl removal processing for removing the curl on the rewound corded strip W. Examples of the curl removal process include a process of repeatedly folding the corded strip W up and down.

  The twist Q of the corded strip W in the storage step K2 may be performed at any position in the hanging portion. That is, the twist Q can be applied at the lowest position, the position closer to the feeding roller 4 than the lowermost position, or the position closer to the receiving roller 10.

  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 Reel Stand 3 Reel 4 Delivery Roller 6 Tire Ply 7 Metal Cord 10 Receiving Roller 13A Pressing Roller D Drum Ds Drum Outer Surface K1 Strip Supplying Process K2 Pasting Process K3 Storage Process Q Torsion S1 First Surface S2 Second Surface W Code Entering strip W1 Cutting piece

Claims (3)

Cut the tape-like cord-containing strips with the metal cords stretched in the length direction and covered with rubber, sequentially from the tip side, and paste the cut pieces side by side in the drum circumferential direction on the drum outer peripheral surface A method of forming a tire ply by:
A strip supplying step of rewinding the cord-containing strip from a reel held by a reel stand, and feeding it from a feed roller of the reel stand;
Receiving the fed corded strip with a receiving roller and sequentially cutting into a predetermined length of cut pieces;
A step of attaching the cut piece to the outer peripheral surface of the drum in a horizontal direction and in a tangential direction of the outer peripheral surface of the drum;
And a storing step of storing the corded strip in a U shape between the feeding roller and the receiving roller.
Moreover, in the strip supplying step, the cord-containing strip is oriented in such a manner that the first surface on the outer peripheral side is the upper side toward the drum and the second surface on the inner peripheral side is the lower side toward the drum in the reel winding state And then rewind from the reel,
In the storing step, the cord-containing strip is twisted, and the first surface and the second surface are reversed and delivered to the receiving roller.   The corded strip is cut obliquely at an angle θ with respect to the length direction, and the cut piece is rotated around the drum circumference while inclining the length direction at an angle equal to the angle θ with respect to the drum circumferential direction. The tire ply forming method according to claim 1, wherein the tire plies are attached in a line.   3. The tire ply forming method according to claim 1, wherein the strip supplying step does not perform a curl removal process for removing curl by repeatedly folding the corded strip up and down.

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