JP2006346930A - Precured tread assembling method and precured tread assembling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To advantageously enhance the uniformity of a regenerated tire by effectively preventing the occurrence of polygonal shaped permanent strain in a precured tread formed into an annular shape without scaling up an apparatus, complicating an apparatus structure and increasing power consumption. <P>SOLUTION: Segmentary members 1 are sucked to the outer peripheral surface of the precured tread 7 formed into the annular shape under negative pressure at a plurality of places leaving an interval in the circumferential direction of the precured tread 7 through an elastic lining sheet 2 to set a base tire 9 to the inner peripheral side of the precured tread 7 in a state that the precured tread 7 is held to the annular shape. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  This invention sets a base tire from which a worn tread has been removed by pre-buffing or the like on the inner peripheral side of a precure tread configured in an annular shape with a predetermined dimension in manufacturing a retread tire. The present invention relates to an assembling method and an assembling apparatus for a precure tread, and in particular, proposes a technique for improving the uniformity of a product tire.

  For example, Patent Documents 1 and 2 disclose conventional techniques for setting a base tire that has been previously buffed on the inner peripheral side of a precure tread formed in an annular shape.

  Here, the prior art disclosed in Patent Document 1 is a precured tread formed in an annular shape in a state in which the diameter of the precured tread is expanded and held by a plurality of finger members extending in the central axis direction thereof. The base tire attached to the wheel is inserted into the inner peripheral side of the tread, and the precure tread is pressed against the base tire from the outer peripheral surface side of each of the plurality of pads of the clamping means. Each finger member is extracted from the circumferential side.

In addition, the prior art disclosed in Patent Document 2 holds the precure tread formed in an annular shape by an annular support means capable of expanding and deforming, and the precure tread is rotated under the rotation of the annular support means. In a state where the diameter of the precure tread is expanded by centrifugal force, the base tire is inserted into the inner periphery of the precure tread, and the precure tread is gradually reduced in diameter under vacuum, and the inner peripheral surface of the precure tread is deformed by the base tire. It is brought into contact with the crown area.
US Pat. No. 4,957,575 Japanese Unexamined Patent Publication No. 7-16950

  By the way, in the former prior art described in Patent Document 1, the ring-shaped precure tread is expanded and held in a polygonal shape by a plurality of finger members. There is a problem in that local permanent distortion is likely to occur in the contact portion of the rubber, and the polygonal strain remains in the retreaded tire after vulcanization, so that the uniformity of the retreaded tire cannot be denied.

On the other hand, in the prior art described in Patent Document 2, since the precure tread is deformed by expansion and contraction under the action of centrifugal force, the occurrence of polygonal permanent distortion therein is effectively prevented. According to the prior art, it is necessary to rotate the precure tread at a high speed at which the centrifugal acceleration is about 800 m / s ^2, and the holding surface of the precure tread is formed by forming part of the annular support means. Since it is necessary to make each of the radially outer chamber and the radially inner chamber of the flexible membrane body into a negative pressure state as required, it is possible to increase the size of the precure tread assembly apparatus and There is a problem that complication is inevitable and equipment costs increase, and there is also a problem that running power increases because power consumption including power for generating negative pressure increases.

  An object of the present invention is to solve such problems of the prior art, and an object of the invention is to form a precure tread formed in an annular shape by a plurality of finger members. Effectively prevents the occurrence of polygonal permanent distortion caused by expanding the diameter from the inner circumference side without increasing the size of the device, complicating the device structure, or increasing the power consumption. Thus, it is an object of the present invention to provide a method for assembling a precure tread and an assembling device used therefor, which can advantageously improve the uniformity of the retreaded tire.

  The method of assembling the precure tread according to the present invention is a segment-like member, for example, at a plurality of locations on the outer circumferential surface of the precure tread formed in an annular shape having a predetermined dimension, at a predetermined interval in the circumferential direction thereof. In the circumferential cross section along the center line in the width direction, a segmented member having an inner ring shape such as an arc shape or a broken line shape is adsorbed directly or indirectly by negative pressure, and the precure tread is formed in an annular shape. In this state, the base tire is set on the inner peripheral side of the precure tread.

  Here, in the case where the precured tread that is negatively adsorbed by the segment-like member and held in an annular shape is not subjected to expansion / contraction diameter deformation, the above-mentioned set of the base tire is set to the interval between the bead portions of the base tire and It is preferable that the adjustment is performed while adjusting the supply internal pressure to the tire.

  That is, the distance between the bead portions of the base tire, in other words, widening and narrowing the foot width each leads to a decrease and increase in the outer diameter of the base tire, and also increases and decreases the base tire internal pressure. It is preferable that the base tire is set on the inner peripheral side of the precure tread while increasing and decreasing the outer diameter of the base tire.

  On the other hand, when causing the precure tread to undergo expansion / contraction diameter deformation, it is preferable to set the base tire while adjusting the inner diameter of the precure tread instead of or in addition to the above.

  Further, the assembly apparatus of the precure tread of the present invention is provided with a plurality of segment-like members arranged at regular intervals in the circumferential direction, the same as described above, for example, over the entire circumference. While communicating with each other by an elastic lining sheet made of rubber, plastic, etc., each segment-like member is connected to a negative pressure suction source and communicates with a through hole of the elastic lining sheet, more preferably one or more openings aligned with it The negative pressure introduction path is provided.

  In such an apparatus, in particular, when the segment-like member is not displaced in the expansion / contraction diameter, it is preferable to provide the elastic lining sheet with a seal skirt that is in contact with each side surface of the precure tread and is continuous in the circumferential direction.

  And it is more suitable to provide the expansion-contraction diameter mechanism of a several segment member regardless of whether such a seal skirt is provided in an elastic lining sheet.

  By the way, this expansion / contraction diameter mechanism is constituted by each link mechanism provided corresponding to each segment-like member, and one translation drive means for operating the expansion / contraction diameter mechanism, for example, a cylinder, a gear mechanism, a screw, etc. It is preferable to provide a mechanism or the like.

  According to the method of the present invention, in a state where the precure tread is held in an annular shape by negative pressure adsorption of a plurality of segment-like members, a base tire is set on the inner peripheral side thereof, and the outer periphery of the crown region of the base tire is set. The surface is brought into contact with the inner circumferential surface of the precure tread, and then the precure tread is sufficiently applied to the outer circumferential surface of the base tire over the entire width under the action of a pressing roll or the like, mostly via an adhesive rubber layer. The pre-cured tread can be properly attached to the base tire as intended, and in this case, the outer periphery of the pre-cured tread is adsorbed and held over a wide range with each segmented member. By doing so, it is possible to effectively prevent the occurrence of polygonal permanent deformation as described in the prior art to the precure tread. Compared, it is possible to advantageously improve the uniformity of retreaded tires as a product tire.

  Also, here, the precured tread can be held in the required annular shape by simply adsorbing the segmented member to the precured tread under negative pressure, so that the diameter of the precured tread can be expanded under the action of centrifugal force. Compared to the conventional technology that deforms and introduces negative pressure into each chamber partitioned inside and outside the flexible membrane body, the device structure is simplified, the device is downsized, and the power consumption is effective Can be reduced.

  By the way, in assembling such a precure tread, a base tire having a preselected outer diameter is provided on the inner peripheral side of the precured tread having a preselected inner diameter, for example, As a matter of course, predetermined contact between the inner peripheral surface of the precure tread and the outer peripheral surface of the base tire, and hence adhesion, can be performed immediately after being inserted by the axial displacement of the base tire. In a state where the bead interval is widened and the outer diameter thereof is reduced, the base tire is inserted into the inner periphery of the precure tread, and then the bead interval is reduced in the precure tread. When increasing the outer diameter of the tire and bringing the required part of the outer peripheral surface of the base tire into contact with the required position of the precure tread, the required set of base tires must be In a simple and quick, and can be carried out at all times properly.

  And this reduces the supply internal pressure to the base tire and inserts it into the precure tread, and then increases the supply internal pressure to provide the desired contact between the base tire and the precure tread. The same applies to the realization.

  In the case where the base tire is deformed to expand and contract as described above, there is an advantage that can effectively prevent the occurrence of unexpected plastic deformation to the precure tread, but instead of or in addition to this, there is an advantage. Also, when the precure tread held by the segment-like member is deformed by expanding and contracting within its elastic region, for example, the predetermined setting of the base tire can be performed simply, quickly, and always properly.

  Here, this expansion and contraction diameter deformation of the precure tread is, for example, when the base tire is inserted into the inner peripheral side of the precure tread, the inner diameter is expanded based on the expansion displacement of the segment-shaped member, and This can be performed by reducing the diameter of the pedestal after positioning the pedestal to a predetermined position, thereby bringing a predetermined contact between the outer peripheral surface of the pedestal tire and the inner peripheral surface of the precure tread.

In the apparatus of the present invention, a plurality of, for example, elastic lining sheets interconnecting segment-like members that are not displaced in expansion and contraction are in direct contact with the outer peripheral surface of the precure tread, and the negative pressure of each segment-like member is determined. A negative pressure is applied to the surface of the precure tread through the introduction path and the through hole of the lining sheet, and in this case, the unexpected leakage of the negative pressure through the groove portion of the precure tread is caused by the elastic lining sheet. Each segment-like member covers the surface of the pre-cured tread over a wide area by blocking the embedding of the groove and the like, or the elastic lining sheet with a tight seal to the land portion of the pre-cured tread. Can be adsorbed and held sufficiently evenly.
Thus, here, it is possible to effectively prevent the occurrence of deformation such as unexpected polygonal distortion in the precure tread.

  Here, in order to more effectively prevent the leakage of negative pressure from the portions existing between the adjacent segment-shaped members of the elastic lining sheet disposed over the entire circumference, between the segment-shaped members, nylon is used. It is preferable to dispose a reinforcing body made of other plastic material so that when the diameter of the segment-shaped member is increased, the adjacent segment-shaped members are bridge-reinforced with the reinforcing body.

  In the case where a plurality of segment-like members are not displaced in diameter, the precure tread is inserted into the enclosed space by the segment-like member from the side thereof, and the outer peripheral surface of the precure tread is placed on the elastic lining sheet. When it is difficult to sufficiently adhere to the inner peripheral surface of the material, when the gap between the two peripheral surfaces is inevitably intervened, the precure tread is reliably adsorbed and retained by the segmented member. To achieve this, the elastic lining sheet is provided with a seal skirt that is continuous over the entire circumference on each side of the precure tread, many of which are tapered, and under contact between the seal skirt and the inclined side, It is preferable to prevent external leakage of negative pressure.

On the other hand, in the case where a plurality of segment-shaped member expansion / contraction diameter mechanisms are provided and these segment-shaped members are displaced by expansion / contraction diameter in synchronization with each other, the elastic lining regardless of the presence or absence of the seal skirt described above. The intended contact of the sheet with the outer periphery of the precure tread can be realized easily and easily.
Even in this case, the seal skirt provided on the elastic lining sheet is effective in preventing the negative pressure and unexpected leakage.

  By the way, when the expansion / contraction diameter mechanism of the segment-shaped member is configured by each link mechanism provided corresponding to each segment-shaped member, and a single translational drive means for operating the expansion / contraction diameter mechanism is provided. Is capable of expanding and contracting the precure tread with a small power consumption with a small power consumption.

FIG. 1 is a perspective view and a schematic cross-sectional view of a main part showing an embodiment of an assembling apparatus according to the present invention.
In the figure, reference numeral 1 denotes a plurality of, in the figure, ten segment-like members arranged at regular intervals in the circumferential direction. Each of these segment-like members 1 is, for example, a center line in the width direction thereof. 1 has an inner surface contour shape such as an arc shape as shown in FIG. 1A or a polygonal line shape in which the intersection angle forms an obtuse angle.

  Here, as shown in FIG. 1B, screws are fixed to the outer peripheral surface side of an elastic lining sheet 2 made of rubber, for example. Or by fixing them with an adhesive or the like, each of the ten segment-like members 1 is interconnected in an airtight manner inside and outside in the radial direction and so as to be capable of expanding and contracting the diameter. 1 is connected to a negative pressure suction source (not shown) and communicates with a through hole 3 formed in the elastic lining sheet 2, preferably at least one negative pressure introduction path 4 in which the opening is aligned with the through hole 3. Is provided.

  When the segment-like members 1 are connected to each other with the elastic lining sheet 2 as described above, the segment-like members 1 extend between the fixed portions of the lining sheet 2 as shown in FIG. 1B, for example. The diameter can be displaced based on the deformation, and the diameter can be automatically reduced based on the contraction deformation of the lining sheet 2.

  In addition, although it is supposed that the elastic lining sheet 2 is clamped and fixed to each edge part of the circumferential direction of the segment-shaped member 1 with the screw 5 from the inner peripheral side in the place shown in the same figure, , The protruding head from the lining sheet 2 abuts against the outer peripheral surface of the precure tread, in other words, the head contacts the elastic lining sheet 2 and thus the segmented member 1 to the precure tread peripheral surface. In order to prevent the close contact, the screw 5 is preferably a flat head machine screw as shown.

  And preferably, as shown in FIG. 1 (c), which shows a cross section along line CC in FIG. 1 (a), the elastic lining sheet 2 has a width substantially equal to the width of the segment-like member 1. Each of the flat bases 6 protrudes from the side edges of the flat base 6 so as to expand obliquely downward, and comes into contact with, for example, a tapered inclined side surface of the precure tread 7 whose cross-sectional contour shape is schematically shown by phantom lines in the figure. The respective seal skirts 8 are provided continuously over the entire circumference.

  In the apparatus configured as described above, when the base tire is set on the inner circumferential side of the precure tread without displacing the segment-shaped member, for example, in FIG. As shown in the line sectional view, from the side of each segment-like member 1 positioned and arranged at a predetermined inner diameter dimension, a precure tread 7 which is formed in an annular shape and has a tread pattern on the outer peripheral surface is concentric with it. As shown in FIG. 2 (b), at least the inclined side surface of the precure tread 7 is brought into airtight contact with the inner surface of the seal skirt 8 of the elastic lining sheet 2. More preferably, the outer peripheral surface of the precure tread 7 is brought into contact with the flat base 6 of the lining sheet 2.

  Thereafter, the negative pressure from the negative pressure suction source is applied to the through-hole 3 of the lining sheet flat base 6 via the negative pressure introduction path 4 of each segment-shaped member 1, so that each segment-shaped member 1 is pre-pressed. The negative pressure is sufficiently evenly adsorbed around the cure tread 7, and the pre-cured tread 7 is held in an annular shape having a predetermined size.

  In this case, leakage of the supply negative pressure is at least based on the tight contact of the seal skirt 8 to the side surface of the precure tread 7, more preferably, the flat base 3 directly to the outer periphery of the precure tread. Therefore, it is effectively prevented based on the close contact.

  Thus, here, the precure tread 7 is held in an annular shape under the adsorption of the plurality of segment-like members 1 without causing angular deformation in the elastic region as well as in the plastic region. .

  In this way, on the inner peripheral side of the precure tread 7 held by the segment-shaped member, as shown in FIG. 2 (c), a base tire 9 from which the tread portion has been removed in advance by buffing or the like is disposed. The outer diameter of the base tire 9 is increased as shown by the phantom line in the figure by reducing the interval between the bead portions of the base tire 9 or increasing the supply internal pressure to the base tire 9. The base tire 9 is set on the precure tread 7 by bringing the outer peripheral surface of the crown region of the pedestal tire 9 into contact with the inner peripheral surface of the precure tread 7 through an adhesive rubber layer provided there.

  Further, the negative pressure adsorption of the precure tread 7 by the segment-like member 1 is released, and then the precure tread 7 is segmented together with the base tire 9 set therein as shown in FIG. By extracting the member 1 to the side, one operation in the assembling apparatus is completed.

  On the other hand, the precure tread 7 after setting the pedestal tire 9 is transferred to the next work process, where the required pre-tread 7 is adhered around the pedestal tire by a pressing roller or the like. Is given.

  Therefore, here, a simple and small device, and without requiring a large amount of power consumption, the precure tread is subjected to polygonal permanent deformation until the completion of the setting of the base tire. It can be held in an annular shape without being generated.

FIG. 3 is a front view and a cross-sectional view showing another embodiment of the assembling apparatus when a segment-shaped member expansion / contraction diameter mechanism is provided.
In this embodiment shown by omitting the elastic lining sheet 2, each segment-like member 1 has a polygonal inner contour shape in which the crossing angle forms an obtuse angle in the circumferential cross section.

  As shown in this figure, each guide means 13 provided on a common annular support plate 12 with a slide rod 11 projecting radially outward from each segment-like member 1, for example, FIG. As shown in the cross-sectional view, the support plate 12 includes a pair of holding members 13a each having an inwardly inclined surface in contact with each of the tapered inclined surfaces of the sliding rod 11 having a substantially trapezoidal contour. The segmented member 1 can be displaced in the radial direction by being guided by the guiding means 13, and one end 15 of the bell crank 14 whose pivoted portion is pivotally supported by the annular support plate 12 is inserted through the long hole 16. The other end 18 of the bell crank 14 can be a cylinder, a rack and pinion, a ball circulation screw or the like. Directly or indirectly hingedly connected to the translation drive means.

  In the figure, one translational drive means Dr, which is a cylinder, is hinged to the other end 18 of one bell crank 14 and is also integrally displaced with the bell crank 14 or a pivot 19 that is rotationally displaced integrally therewith. The intermediate arm 20 is provided between the one end 15 and the other end 18 so as to be substantially orthogonal to the extending portion toward the other end. The intermediate arm 20 is connected to the adjacent bell crank 14 via the connecting rod 21. Are sequentially connected to the other end 18.

  Therefore, according to such an expansion / contraction diameter mechanism which becomes each link mechanism provided corresponding to each segment-like member 1, the other end 18 of one bell crank 14 is directly connected by one translation drive means Dr. As shown in the drawing, the other end 18 of the other seven bell cranks 14 is driven forward and backward indirectly and synchronously via the connecting rod 21. When the bell crank 14 is swung counterclockwise around the pivot 19 as shown in the drawing by driving the other end 18 of each bell crank 14 in the advancing direction, the bell crank 14 The pin 17 and thus the sliding rod 11 are displaced radially inward by the one end 15 of this, and as a result, the segment-like member 1 is shown by a solid line in the figure, for example. It will be displaced in the radial position.

On the other hand, when the other end 18 of the bell crank 14 is driven backward and the bell crank 14 is swung clockwise around the pivot shaft 19, one end 15 of the bell crank 14 is connected to the pin 17 and The sliding rod 11 is displaced outward in the radial direction, whereby the segment member 1 is displaced to a diameter-enlarged position indicated by an imaginary line in the drawing, for example.
In this figure, although a total of eight connecting rods 21 are disposed for the expansion / contraction diameter displacement of the segment-like member 1 as described above, in order to absorb manufacturing errors and the like, translational driving is performed. It is also possible to omit the connecting rod 21 located corresponding to the means Dr.

  In setting the base tire on the inner peripheral side of the precure tread using the assembling apparatus including the expansion / contraction diameter mechanism and the translation driving means as described above, for example, as schematically shown in FIG. In the state in which the segment-shaped member 1 is in an expanded displacement posture as shown in FIG. 4 (a), an annular precure tread 7 is inserted inside, and then the segment-shaped member 1 is As shown in FIG. 4 (b), the diameter is reduced and the seal skirt 8 of the elastic lining sheet 2, preferably the flat base 6 is brought into close contact with the precure tread 7, and a segment-like member is applied under the action of negative pressure. 1 is adsorbed to the precure tread 7.

  Thereafter, the segment-like member 1 is displaced in diameter expansion as shown in FIG. 4 (c), whereby the negative pressure adsorbed precure tread 7 is also subjected to diameter expansion deformation within its elastic region, and this expansion is achieved. Under the diameter state, a base tire 9 is inserted into the inner peripheral side of the precure tread 7 as shown by a solid line in the figure, and subsequently, along with the reduced diameter displacement of the segmented member 1, the precure tread 7 Is reduced in diameter as shown in FIG. 4 (d), or in combination with the increase in the outer diameter of the base tire 9, as described above, on the inner peripheral surface of the precure tread 7, The base tire 9 is set on the precure tread 7 by bringing the required contact with the crown region of the base tire 9 through, for example, an adhesive rubber layer.

  After that, the negative pressure adsorption of the segment-like member 1 to the precure tread 7 is released, and the segment-like member 1 is expanded and displaced as shown in FIG. And the base tire 9 is extracted to the side of the segment-like member 1, and a series of work is complete | finished.

Thus, according to this apparatus, it is possible to set the base tire 9 more simply and more reliably than that shown in FIG.
In addition, since this device is only provided with the expansion / contraction diameter mechanism and one translational drive means to the above-described device, it is still possible to simplify the structure of the device and reduce the size of the device. In addition, the power consumption can be kept sufficiently small.

1 is a schematic perspective view and a schematic sectional view showing an embodiment of an apparatus according to the present invention. It is a rough line sectional view of the width direction which illustrates the set process of a base tire using the device shown in FIG. It is the front view and sectional view which show other embodiments of the device concerning this invention, omitting an elastic lining sheet. FIG. 4 is a view similar to FIG. 2 exemplifying a base tire setting process using the apparatus shown in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Segment-like member 2 Elastic lining sheet 3 Through-hole 4 Negative pressure introduction path 5 Screw 6 Flat base 7 Precure tread 8 Seal skirt 9 Base tire 11 Sliding rod 12 Circular support 13 Guide means 13a Holding member 14 Bell crank 15 One end 16 long hole 17 pin 18 other end 19 pivot 20 intermediate arm 21 connecting rod Dr translation drive means

Claims (7)

  In a state where the precured tread is held in an annular shape by adsorbing the segmented member to the outer peripheral surface of the precure tread formed in an annular shape at a plurality of locations spaced in the circumferential direction by negative pressure adsorption. A method of assembling the precure tread in which a base tire is set on the inner periphery of the precure tread.   The method of assembling a precure tread according to claim 1, wherein the setting of the base tire is performed while adjusting at least one of an interval between the bead portions and a supply internal pressure to the base tire.   The method of assembling the precure tread according to claim 1 or 2, wherein the setting of the base tire is performed while adjusting the inner diameter of the precure tread.   A plurality of segment-like members arranged at regular intervals in the circumferential direction are interconnected by elastic lining sheets arranged over the entire circumference, and each segment-like member is elastically connected to a negative pressure suction source. An assembly device for a precure tread, which is provided with one or more negative pressure introduction paths communicating with the through-holes of the lining sheet.   The assembly apparatus of the precure tread of Claim 4 which provides the seal skirt which contacts each side surface of a precure tread and is continuous in the circumferential direction on the elastic lining sheet.   The assembly apparatus for a precure tread according to claim 4 or 5, wherein an expansion / contraction diameter mechanism for a plurality of segment members is provided.   7. The precure tread according to claim 6, wherein the expansion / contraction diameter mechanism is constituted by each link mechanism provided corresponding to each segment-like member, and further provided with one translational drive means for operating the expansion / contraction diameter mechanism. Assembly equipment.

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