JP5303388B2 - Stitching equipment - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a stitching device that presses a laminated body formed by laminating two or more belt-shaped tire constituent members and press-bonds these tire constituent members to each other. To do.

  A pneumatic tire has a laminated structure in which a large number of tire components such as an inner liner, a chafer, a carcass ply, a side tread, a belt and a top tread are laminated. The operation | work which presses these tire structural members laminated | stacked on the top or on the conveyance conveyor, and is crimped | bonded (stitching) is needed. This is a very important operation to ensure that the tire components to be bonded and laminated are securely bonded without causing air accumulation between them and the quality of the product tire is good. Become.

  For example, in the process of forming a top tread by bonding other tire components having different shapes and rubber properties to unvulcanized rubber tire components extruded from an extruder, to prevent air accumulation, etc. It is necessary to stitch the tire component along the bonded portion.

  Similarly, in the step of attaching a tire constituent member such as a belt or a top tread to the toroidal-shaped green case, it is necessary to stitch the tire constituent member from the radially outer side to the inner side.

  Conventionally, as a stitching apparatus for performing such stitching, one using a stitching roller has been mainstream. For example, as shown in FIG. 5, a tire constituent member (mini side wall rubber MS) made of different rubber is bonded to a tire constituent member (tread rubber TR) made of unvulcanized rubber extruded from an extruder (not shown). When forming the tread, the laminated body LB formed by laminating two or more of these tire constituent members TR and MS having a belt shape is conveyed by the conveyer 100 and can be rotated around the axis of the support shaft 101. Stitching is generally performed by pressing the laminated body LB against the conveyor 100 with a stitching roller 102 supported by a support shaft. Similarly, Patent Document 1 discloses an apparatus that uses a stitching roller to stitch tire constituent members such as a belt and a top tread that are attached to a toroidal green case.

JP-A-2005-280258

  However, in the conventional stitching apparatus, since the stitching roll has a constant shape, when the shape of the member to be stitched changes, the stitching roll may be uneven due to misalignment of the stitching roll, etc. was there. When such spots occur, there is a possibility that air pools will occur at locations where stitching is insufficient, or that moisture may accumulate during the water cooling process after extrusion. Therefore, conventionally, when the shape of the member to be stitched changes, it is necessary to move or replace the stitching roller to match the shape of the member to be stitched each time. There was a problem.

  Therefore, the present invention provides a stitching device capable of improving the problem of crimping between tire constituent members without causing the above-described problem of increasing man-hours even when the shape of the member to be stitched changes. Objective.

  In order to solve the above-mentioned problems, the stitching device according to the present invention is the stitching device for pressing the laminated body formed by laminating two or more of the tire-constituting members having a belt shape and press-bonding the tire constituent members to each other. A support means for supporting the body from its back surface so that the body can travel in the longitudinal direction, and a surface of the laminate supported by the support means, corresponding to at least overlapping portions of the tire constituent members in the laminate An air spraying means for spraying compressed air onto the surface region to crimp the tire constituent members together is provided.

  In such a stitching device, compressed air is blown by the air blowing means to a predetermined surface area of the laminated body supported by the supporting means, and the laminated tire constituent members are pressure-bonded.

  Therefore, according to the stitching device of the present invention, even when the shape of the member to be stitched changes, the laminate can be reliably pressed by compressed air without causing problems such as displacement (that is, compressed air). Is not affected by changes in the shape of the member to be stitched), so there is no need to move or replace the stitching roll to match the shape of the member to be stitched, resulting in increased man-hours. In addition, it is possible to improve the crimping failure between the tire constituent members.

  In the stitching device of the present invention, the compressed air spraying position on the laminate by the air spraying means may be on the rear side in the traveling direction as it goes inward in the width direction of the laminate. preferable.

  In the stitching device of the present invention, the air blowing means has a compressed air discharge port, and the distance from the discharge port to the surface of the laminate is inward in the width direction of the laminate. It is preferable to gradually decrease as it goes to.

  According to the present invention, even when the shape of a member to be stitched changes, stitching that can improve the problem of crimping between tire components without causing the problem of increased man-hours due to movement or replacement of the stitching roll. A device can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS The stitching apparatus concerning embodiment of this invention is shown schematically, (a) is a perspective view, (b) is a top view. It is a perspective view which shows the air nozzle applicable to this invention. It is a perspective view which shows the air nozzle applicable to this invention. (A), (b) is a bottom view when the air nozzle applicable to this invention is seen from the front end side. It is the perspective view which showed schematically the stitching apparatus concerning a prior art.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, FIG. 1 schematically shows a stitching apparatus according to an embodiment of the present invention, in which (a) is a perspective view and (b) is a plan view.

  Some pneumatic tires have a rubber strip with a generally triangular cross section that exists in the connecting region between the sidewall rubber and the tread rubber, known as the so-called “mini sidewall”. The wall can be pasted on both ends of the tread rubber extruded from a dual extruder or the like, or can be molded by coextrusion with the tread rubber using a triple extruder or the like.

  However, when the former method, which does not require major modification of the equipment, is adopted, the third rubber member (here, mini-sidewall rubber) is bonded on the extrusion train, so stitching is performed to strengthen the adhesive force. This work is essential. Conventionally, stitching is performed by pressing the stitching roller 102 against the mini sidewall rubber MS as shown in FIG. 5, so the shape and size of the mini sidewall rubber MS, the width and shape of the tread rubber TR, etc. As described above, the rollers 102 may be misaligned or the like may cause a press-bonding failure. Therefore, here, a description will be given of a stitching apparatus in the case of applying a mini-sidewall rubber to a tread rubber as a rubber extruded product extruded from an extruder and press-bonding to form a top tread.

As shown in FIG. 1, this stitching apparatus 1 is composed of a laminate LB formed by laminating a mini-sidewall rubber MS on a belt-shaped tread rubber TR extruded from an extruder (not shown). A conveying conveyor 2 as a supporting means for supporting from the back side so that it can travel in the traveling direction A, and a tread rubber TR and a mini sidewall on at least the surface of the laminated body LB supported by the conveying conveyor 2 An air blowing device 3 as air blowing means for blowing compressed air is provided on the surface region S _OL corresponding to the overlapping portion with the rubber MS.

  The conveyor 2 is a conveyor that conveys from an upstream extruder to a downstream process (such as a water cooling process), and has a large number of parallel and horizontal rollers 4. The laminated body LB is transported in the direction of arrow A by being connected to a motor (not shown) via a chain or the like. The conveyor 2 is controlled to a predetermined speed by controlling the rotational speed of the motor by a control device (not shown).

  In the present embodiment, the air blowing device 3 is a regulator 8 for adjusting the pressure in the compressed air supply line 7 after the compressed air supplied from the compressor 5 as a compressed air supply source is once filled in the buffer tank 6. In addition, air is supplied to the air nozzle 10 through an electromagnetic valve 9 for turning on / off the air. Furthermore, the amount of air supplied from the compressor 5 can be adjusted by controlling the regulator 8 and the electromagnetic valve 9 by a control device (not shown). The buffer tank 6 also has a function of storing air inside even when the compressor 5 is stopped, and homogenizing fluctuations in output of the supplied compressed air.

The air nozzle 10 is disposed above the conveyor 4 and is held so as to be adjustable in angle with respect to the width direction d (direction orthogonal to the traveling direction A) of the stacked body LB via an angle adjustment mechanism (not shown). ing. The air nozzle 10 has a discharge port 11 for discharging the supplied compressed air at its front end and a compressed air intake 12 at its rear end. As shown in FIG. 2, eight discharge ports 11 are arranged on the front end surface of the air nozzle 10, and each has a rectangular opening shape. The discharge port 11 is designed so that at least compressed air can be blown over a wider range in the width direction than the surface region _SOL corresponding to the overlapping portion of the stacked body LB. For example, when a type in which air is jetted straight is used as the discharge port 11, the arrangement range L of the discharge port 11 can be made equal to the width W _SOL of the surface region S _OL , while the discharge port 11 has a wide-angle injection. In the case of adopting such a type, the arrangement range L of the discharge port 11 can be made smaller than the width W _SOL of the surface region S _OL .

The number of discharge ports 11 and the opening shape are not particularly limited as long as compressed air having a desired pressure can be blown onto the surface of the laminate LB. For example, a single slit-like shape extending linearly as shown in FIG. The discharge port 11 may be used. As the pressure of the air supplied to the air nozzle 10, the total opening area of the discharge port 11, the distance h from the discharge port 11 to the surface of the laminate LB (see FIG. 1), and the pressure required to press the laminate LB. It can be determined in consideration of wind power. The wind force that presses the stacked body LB (pressure on the surface of the stacked body LB) is preferably 0.25 MPa to 0.4 MPa. If the wind force that presses the laminated body is less than 0.25 MPa, the pressing force by the compressed air is insufficient, and there is a risk that sufficient pressure bonding between the tire constituent members may not be ensured. This is because there is a risk of excessively deforming unvulcanized tire components. In this example, the pressure of the compressed air supply line 7 is 0.3 MPa, the opening area of the discharge port is 150 mm ² , the pitch of the discharge ports is 5 mm, the distance h from the discharge port to the surface is 5 mm on the innermost side in the width direction, The outermost width is 30 mm.

In the stitching device 1 such embodiment, at the same time the laminate LB is conveyed in the traveling direction A by conveyor 2, compressed to at least a predetermined surface area S _OL of the laminate LB with air blow device 3 is conveyed Air is applied, whereby the tread rubber TR and the mini sidewall rubber MS are pressure-bonded.

  Therefore, according to this stitching apparatus 1, even when the shape of the member to be stitched changes, the laminate LB can be surely pressed by the compressed air, so the stitching roll can be adjusted to match the shape of the member to be stitched. It is not necessary to move or exchange, and it becomes possible to improve the crimping | compression-bonding problem of tire structural members, without producing the problem of an increase in a man-hour.

  In this stitching device 1, the compressed air is blown to the laminated body LB by the air blowing device 3 at the upstream side in the transport direction (traveling direction A) as it goes inward in the width direction d of the laminated body LB. (Back side) is preferable. That is, as shown in FIG. 1B, the air nozzle 10 is disposed so as to be inclined (angle θ) with respect to the width direction d of the stacked body LB, and the discharge port 11 located inside the width direction d is closer to the discharge port 11. It is preferable to be positioned upstream of the traveling direction A of the stacked body LB.

  According to this, the tire constituent members (here, the tread rubber TR and the mini sidewall rubber MS) from the inner side to the outer side in the width direction d of the laminated body LB (that is, from the inner part P1 to the outer part P2). Can be sequentially pressure-bonded, so that even if air remains between these tire constituent members, the air-pressure can be pressure-bonded while being efficiently discharged. In addition, when the mini sidewall rubber MS is pressure-bonded to both ends of the tread rubber TR as in the present embodiment, there is no tread rubber TR that supports the lower end of the mini sidewall rubber MS (see FIG. 1), when the stitching is performed from the outer end portion, a free portion which is not restrained by the tread rubber TR becomes easy to move, and as a result, there is a possibility that wrinkles are generated at the time of crimping. By sequentially pressing the tire constituent members from the inner side to the outer side in the width direction d of the tire, stitching can be performed from the portion constrained by the tread rubber TR. Can do. The angle θ is preferably in the range of 30 to 60 degrees. This is because by setting the range of the angle θ to 30 to 60 degrees, it is possible to surely obtain the effect of sequentially pressing the tire constituent members from the inner part P1 toward the outer part P2. Although the angle θ can be set to 80 to 85 degrees at the maximum, in this case, there is a concern that the arrangement range L of the discharge port 11 becomes longer and the apparatus becomes larger, and the air nozzle 10 and the tire configuration. There is also a concern that a problem of contact with the member may occur.

Further, in this stitching device 1, the distance from the discharge port 11 to the surface area S _OL of the laminate LB h (see FIG. 1), gradually decreasing him to go inward in the width direction d of the laminate LB It is preferable. Alternatively, when the distance from the discharge port 11 to the surface area S _OL of the laminate LB is constant, the discharge port 11 (see FIG. 4 (a)) the opening area or slit-like discharge port 11 (FIG. 4 (b It is preferable to make the opening width w of (see)) smaller as it goes inward in the width direction.

  According to this, since the wind pressure on the inner side in the width direction of the laminated body LB can be increased with respect to the wind pressure on the outer side in the width direction, between these tire constituent members (here, between the tread rubber TR and the mini side wall rubber MS). Even when air remains, the residual air can be efficiently discharged, and when the mini side wall rubber MS is pressure-bonded to both ends of the tread rubber TR as in this embodiment, the mini side Since the portion restrained by the tread rubber TR can be strongly stitched with respect to the wall rubber MS, and the portion not restrained by the tread rubber TR can be stitched weakly, it is possible to prevent wrinkles from being generated during pressure bonding.

  As mentioned above, although demonstrated based on the example of illustration, this invention is not limited to the above-mentioned embodiment, It can change suitably within the description range of a claim, For example, the stitch of this invention The stitching device can be applied to stitching on a tire molding drum. In this case, the outer peripheral surface of the tire molding drum can be used as a support means, and while the tire molding drum is rotated, compressed air can be blown onto the surface of the tire constituent member to press the tire constituent members together. In this case, the rotation direction of the tire molding drum is the traveling direction of the laminate LB. Furthermore, in the present invention, it goes without saying that an auxiliary stitching roll can be provided in addition to the air spraying means to press the laminated body.

  Thus, according to the stitching device of the present invention, even when the shape of the member to be stitched changes, there is no problem of increasing the number of man-hours due to movement or replacement of the stitching roll, and the problem of crimping between the tire constituent members can be prevented. An improved stitching device can be provided.

DESCRIPTION OF SYMBOLS 1 Stitching apparatus 2 Conveyor 3 Air blow apparatus 4 Roller 10 Air nozzle 11 Discharge port

Claims (3)

In a stitching device that presses a laminate formed by laminating two or more of tire constituent members that form a belt shape, and press-bonds these tire constituent members,
Support means for supporting the laminate from the back surface so that the longitudinal direction can be the traveling direction,
An air spraying means for spraying compressed air onto the surface area of the laminate supported by the support means and corresponding to at least a portion of the laminate corresponding to the overlapping portion of the tire constituent members. A stitching apparatus comprising:   2. The stitching device according to claim 1, wherein a position where the compressed air is blown to the laminated body by the air blowing means is a rear side in the traveling direction as it goes inward in the width direction of the laminated body.   The air blowing means has a compressed air discharge port, and the distance from the discharge port to the surface of the laminate gradually decreases as it goes inward in the width direction of the laminate. The stitching apparatus according to 2.

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