JP2008221718A - Take-up device of tire member and manufacturing method of pneumatic tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a take-up device for taking up the protruded part, which is protruded axially outside of a bead core when a green tire is molded, around a main body part. <P>SOLUTION: The take-up device of a tire member includes the slide member 7 provided to the outside of a bead core holding device 3 to be moved axially, a plurality of circumferentially separated oscillation arms 8 including the arm main body 8A which extends axially along a tire by passing the inner peripheral surface side of the protruded part 21 and keeps one end pivotally mounted on the slide member 7 in a shakable manner and the roller 8B pivotally mounted on the other end of the arm main body 8A and provided so as to be spaced apart from each other and the buffer sheet 9 comprising an elastic material continuously extended between the protruded part 21 and the oscillation arms 8 in the peripheral direction of the tire to prevent the direct contact of both members. The buffer sheet 9 is wound around the roller 8B moved from the inside in a radial direction to the outside along the main body part 20 to be expanded in diameter and the protruded part 21 is taken up through the buffer sheet 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hoisting device for hoisting an overhanging portion that protrudes axially outward from a bead core to a toroidal main body portion when forming a green tire, and more particularly, an undulation that tends to occur on the outer surface of the hoisted portion. The present invention relates to a tire member hoisting device useful for manufacturing a pneumatic tire that reduces the amount of noise and, in turn, improves the appearance and is excellent in uniformity, and a method of manufacturing a pneumatic tire using the same.

  Conventionally, Patent Documents 1 and 2 below have been proposed as methods for forming a raw tire (sometimes referred to as “low cover” or “green tire”). In these methods, after a tire member including a carcass ply is wound around a molding drum in a cylindrical shape, a pair of bead cores are fitted, and as shown in FIG. 14, the tire member between the bead cores b and b is formed in a toroidal shape. After inflating and deforming, the protruding portion c of the tire member outside the bead core b in the tire axial direction is wound up around the bead core b.

  Further, the protruding portion c of the tire member is a plurality of rollers r pivotally attached to the swinging arm f spaced in the circumferential direction on the inner peripheral surface and the bead core b and along the body portion g. By being pushed up radially from the inside to the outside in the tire radial direction, it is wound up on the main body g.

JP 2004-268371 A JP 2004-9298 A

  However, as shown in FIG. 14, when the protruding portion c of the tire member is wound up by the roller r, the side wall rubber c1 of the protruding portion c has a large pressure on the outer peripheral surface of the roller r and the arm f that supports the roller r. On the other hand, a gap is formed between adjacent rollers in the tire circumferential direction. As a result, as shown in FIG. 15 (a) and FIG. 15 (b) which is a sectional view taken along the line A-A, the roller r and / or the arm f are formed on the outer surface of the bead portion or the sidewall portion of the green tire t. There is a problem in that the groove-shaped recess e recessed by is spaced apart (in other words, between the recesses e, e there is a protrusion j formed by bulging into the gap between the adjacent rollers r. It is formed.). Although such undulation is alleviated to some extent by vulcanization, it may remain after vulcanization depending on the situation, and may significantly deteriorate the appearance of the tire. In addition, there is a problem of causing tire weight imbalance and worsening uniformity.

  The present invention has been devised in view of the above circumstances, and is continuous in the tire circumferential direction between the roller that rolls up the protruding portion and the protruding portion, and is wound around the roller and radially expanded. The present invention provides a tire member hoisting device and a pneumatic tire manufacturing method capable of suppressing undulation that tends to occur on the outer surface of a raw tire on the basis of hoisting the protruding portion through a possible cushioning sheet. The main purpose.

  According to the first aspect of the present invention, there is provided a main body portion extending in a toroidal shape between a pair of bead cores held by the bead core holding device, and connected between the main body portion and between the bead core and the bead core holding device. A tire member hoisting device for hoisting the protruding portion of the tire member having a cylindrical protruding portion protruding outward in the tire axial direction of the bead core to a side region of the main body portion, the axial direction of the bead core holding device A slide member provided on both outer sides and movable in the axial direction so as to come into contact with and away from the main body, and extends in the tire axial direction through the inner peripheral surface side of the protruding portion and can be raised radially outward in the tire axial direction A circle including an arm body pivotally attached to the slide member at one end thereof and a roller pivotally attached to the other end of the arm body A plurality of swing arms spaced apart in the direction, and the protruding portion and the swing arm are continuously extended in the tire circumferential direction to prevent contact between the protruding portion and the swing arm. In addition to including a buffer sheet made of an elastic material, the buffer sheet is wound around each of the rollers moving from the inside to the outside in the radial direction along the body by moving the slide member toward the body. The diameter is increased in the radial direction, and the protruding portion is wound up on a side region of the main body through the buffer sheet.

  According to a second aspect of the present invention, the shock absorbing sheet has an outer edge in the tire axial direction fixed to the slide member or the arm body, and an inner edge in the tire axial direction fixed to the stationary member. The tire member winding device according to claim 1.

  According to a third aspect of the present invention, the cushion sheet includes a seat base portion that extends continuously in the tire circumferential direction, a seat base portion that is provided on the outer side in the tire axial direction of the seat base portion and spaced apart in the tire circumferential direction. The tire member hoisting device according to claim 1 or 2, comprising a plurality of band-shaped portions that are more easily stretched.

  According to a fourth aspect of the present invention, there is provided the tire member hoisting device according to the third aspect of the present invention, wherein the band-shaped portion is provided with a plurality of grooves extending in the tire circumferential direction on at least one surface.

  The invention described in claim 5 is a method for manufacturing a pneumatic tire including a step of winding the protruding portion of the green tire using the hoisting device according to any one of claims 1 to 4.

  In the present invention, as the slide member moves toward the main body, the cushion sheet is wound around each roller moving from the inside to the outside in the radial direction along the main body to expand the diameter in the radial direction. And an overhang | projection part is wound up by the side area | region of a main-body part via the buffer sheet | seat continuous in this tire circumferential direction. Since such a buffer sheet extends across the rollers so as to close the gap between the rollers that is enlarged as the rollers move in the radial direction, a part of the protruding portion is deformed so as to largely protrude into the gap between the rollers. Can be suppressed. Therefore, the formation of large undulations on the outer surface of the raw tire is effectively suppressed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a partial perspective view of a raw tire molding apparatus 1 including a hoisting device 4 of the present embodiment, and FIGS. 2 and 3 show sectional views thereof. The green tire molding apparatus 1 includes a molding drum 2 having a substantially cylindrical shape, a pair of bead core holding devices 3 arranged on both outer sides in the axial direction of the molding drum 2, and both outer sides in the axial direction of the bead core holding device 3. And a hoisting device 4 for a tire member disposed in the vehicle. 1-3, although the whole is not shown in figure, the raw tire shaping | molding apparatus 1 of this embodiment has a left-right symmetric structure with respect to the reference line C (shown in FIG. 2).

  The molding drum 2 includes, for example, a center drum 2a disposed at the center thereof and a pair of side drums 2b and 2b disposed adjacent to both sides in the axial direction. Each of the drums 2a and 2b has substantially the same outer diameter and is coaxially disposed on the central shaft 5. Such a forming drum 2 provides a cylindrical outer peripheral surface having a wide width around which a tire member can be wound, by making the outer peripheral surfaces of the center drum 2a and the side drum 2b substantially continuous in the axial direction.

  In the center drum 2a, for example, an outer peripheral surface that is substantially continuous in the circumferential direction is formed by linking a plurality of segments s in the circumferential direction, while the segments s are alternately and radiused using the actuator 2a1. By pulling inward in the direction, the diameter can be reduced as shown in FIG.

  The side drum 2b includes, for example, a cylindrical base portion 2b1 and a sleeve 6 fixed to the outer edge in the tire axial direction via a flange 2b2, and the center drum 2a side is opened. The sleeve 6 is extrapolated to be movable with respect to the central shaft 5 and is connected to an actuator (not shown). Therefore, as shown in FIG. 3, the center drum 2 a can be reduced in diameter, and the pair of side drums 2 b and 2 b can be brought close together with the sleeve 6. Thereby, the tire axial direction distance between a pair of bead core holding | maintenance apparatuses 3 and 3 is adjusted.

  The bead core holding device 3 includes a ring-shaped inner base 3a fixed to the sleeve 6 in the vicinity of the flange 2b2 of the side drum 2b, and a ring fixed to the sleeve 6 at a position spaced axially outward from the inner base 3a. Between the inner base 3a and the outer base 3b, and a slide ring 3c disposed between the inner base 3a and the outer base 3b and movable in the axial direction along the sleeve 6; And a core receiving portion 3d that is held so as to be movable only in the direction and can be projected and retracted in the radial direction by sliding of the slide ring 3c.

  The core receiving portion 3d includes a plurality of segments divided in the circumferential direction, and in this embodiment, has a slope 3d1 that engages with the slope 3c1 of the slide ring 3c. The core receiving portion 3d can move radially outward by movement of the slide ring 3c in the axial direction, and can move radially inward by movement of the slide ring 3c in the axial direction. Here, the inside in the axial direction is a direction toward the reference line C, and the outside in the axial direction is a direction away from the reference line C.

  The hoisting device 4 includes a slide member 7 movable along the central axis 5 of the forming drum 2 and a plurality of swing arms attached to the slide member 7 at intervals in the circumferential direction and extending in the axial direction. 8 and a cushioning sheet 9 made of an elastic material that prevents the contact between the protruding portion 21 of the tire member described later and the swing arm 8 by continuously extending in the tire circumferential direction. .

  In the present embodiment, the slide member 7 has a ring shape that is extrapolated to the sleeve 6, and is arranged so as to be movable in the axial direction with respect to the sleeve 6 by a drive mechanism such as an actuator (not shown).

  As is apparent from FIG. 4 which is an AA end view of FIGS. 1 and 3, the swing arm 8 is provided on the slide member 7 at a constant circumferential pitch. Further, the swing arm 8 has a substantially L-shaped arm body 8 </ b> A in which one end 8 a on the outer side in the tire axial direction is pivotally attached to the slide member 7 so as to be able to stand up radially, It comprises a roller 8B pivotally attached to the other end 8b on the bead core holding device 3 side of the main body 8A. The roller 8 </ b> B can rotate around an axis along a tangential direction with respect to the circumference of the forming drum 2.

  The swing arm 8 is provided with an annular rubber band B for tightening them. As a result, as shown in FIGS. 1 to 3, each swing arm 8 (and its outer peripheral surface) is maintained in an initial state in which it is substantially horizontal at a constant interval in the circumferential direction. At this time, in the present embodiment, as shown in FIGS. 2 to 3, each roller 8B is placed on the horizontal outer surface of the outer base 3b, and the position thereof is restrained. In the initial state, the virtual cylinder (shown in FIG. 4) connecting the outer peripheral surface 8c of the swing arm 8 has an outer diameter Vc slightly smaller than that of the molding drum 2.

  Further, the swing arm 8 is moved inward in the axial direction of the slide member 7, and the roller 8B of the swing arm 8 moves up the cone-shaped slope 3b1 provided on the outer base 3b. Tilt in a direction that spreads radially while extending band B. On the contrary, the swing arm 8 moves in the direction in which the roller 8B descends the slope 3b1 and the diameter of the roller 8B decreases radially in accordance with the tightening force of the rubber band B by the movement of the slide member 7 outward in the axial direction. Tilt and return to the initial state.

  The buffer sheet 9 is made of a stretchable elastic material, preferably a rubber material, and is formed as a small thickness sheet. FIG. 5 shows a development view of the buffer sheet 9. As shown in FIGS. 1, 4, and 5, the cushion sheet 9 of the present embodiment includes a cylindrical sheet base portion 9 </ b> A that extends continuously in the tire circumferential direction and surrounds the swing arm 8. It is composed of a plurality of band-like portions 9B that are connected to the outer side in the tire axial direction of the seat base portion 9A and spaced apart in the tire circumferential direction.

  The sheet base portion 9A is formed with a substantially constant thickness T1 as shown in FIG. 5B, which is a BB cross-sectional view of FIG. 5A, and has a smooth outer surface 9A1 and inner surface 9A2. Have. Further, the end 9i of the seat base portion 9A on the inner side in the tire axial direction extends inward in the tire axial direction so as to cover the bead core holding device 3, and is folded back and fixed to the front base 3a (stationary member) of the bead core holding device 3. Is done. As shown in FIG. 4, in the initial state of the swing arm 8, the outer diameter Vr formed by the outer peripheral surface of the sheet base portion 9 </ b> A is formed substantially the same as that of the molding drum 2.

  On the other hand, since the band-like portion 9B is intermittently provided in the tire circumferential direction, it can be easily extended in the axial direction as compared with the seat base portion 9A. In this embodiment, as shown in FIG. 5C, which is a cross-sectional view taken along the line C-C of FIG. 5A, at least a part of the band-shaped portion 9B (all in this embodiment) has a tire circumferential direction. A plurality of extending grooves G are provided. Such a groove | channel G is preferable at the point which further reduces the rigidity of each band-shaped part 9B, and makes it easy to extend. Further, the edge 9o on the outer side in the tire axial direction of the band-shaped portion 9B is fixed to the slide member 7 in a slightly loosened state in this embodiment. For this reason, the end edge 9o on the outer side in the tire axial direction of the cushioning sheet 9 can move in the axial direction together with the slide member 7.

  A process (molding method) for forming a green tire using the green tire forming apparatus 1 configured as described above will be described.

  First, as shown in FIG. 6, the tire member 10 is wound in a cylindrical shape across the forming drum 2 and the buffer sheet 9. The tire member 10 is wound around, for example, an inner liner rubber 11 forming a tire lumen surface, a bead rubber 14 connected to an edge in the width direction, a side wall rubber 13 connected to the bead rubber 14, and the outside thereof. And carcass ply 12. These may be integrated in advance, or may be wound in several parts as in this embodiment.

  The buffer sheet 9 extends continuously between the tire member 10 and the swing arm 8 in the tire circumferential direction. For this reason, the tire member 10 is wound around the shock-absorbing sheet 9 that is continuous in the circumferential direction without directly contacting the swinging arm 8 that is disposed at a distance. This is useful for preventing the tire member 10 from being deformed into a polygonal shape.

  In addition, if the rigidity of the seat base 9A of the cushioning sheet 9 is remarkably small, the tire base 10 may be greatly deformed by winding and the molding accuracy of the raw tire may be deteriorated. Therefore, the thickness T1 of the seat base 9A is preferably Is preferably 1.0 mm or more, more preferably 1.5 mm or more. Further, the band-shaped portion 9 </ b> B of the cushioning sheet 9 is set to a length that does not contact the tire member 10. In other words, the tire member 10 is wound only on the sheet base portion 9A and not on the band-shaped portion 9B with respect to the cushioning sheet 9.

  The core receiving portion 3d of the bead core holding device 3 is positioned at a position radially inward of the outer diameter of the molding drum 2 in consideration of, for example, the thickness of the bead rubber 14 and the subsequent fitting process of the bead core 15. It is desirable to wait.

  Next, a step of fitting a pair of bead cores 15 into the tire member 10 is performed. The bead core 15 is fitted into a position corresponding to the core receiving portion 3 d of the bead core holding device 3. Thereafter, as shown in FIG. 7, the core receiving portion 3d is moved radially outward. Thereby, the core receiving part 3d can press and hold the inner peripheral surface of the bead core 15 via the seat base 9A of the cushioning sheet 9 and the tire member 10. The bead core 15 is preferably provided with a bead apex rubber 16 having a substantially crescent cross section, for example, in advance.

  Next, as shown in FIG. 8, the tire member 10 between the bead cores 15 and 15 is expanded in a toroid shape to form the main body portion 20. That is, after the diameter of the center drum 2a of the forming drum 2 is reduced, the bead core holding device 3 together with the sleeve 6 is moved inward in the axial direction to approach each other. Accordingly, the axial distance between the bead cores 15 and 15 held by the bead core holding device 3 can be reduced from CW0 (shown in FIG. 6) to CW1. At the same time, the tire member 10 between the bead cores 15 and 15 can be inflated and deformed in a toroid shape by supplying, for example, bladder or high-pressure air (both not shown) to the inner region i of the tire member 10. At this time, the tread region of the tire member 10 is bonded to the inner peripheral surface of the ring-shaped tread rubber body 17 including the belt layer 17a and the tread rubber 17b waiting in advance in the radial direction.

  Next, in this embodiment, a trimming process is performed. In the trimming step, as shown in FIG. 9, the trim roller 19 having the same circumferential surface as the tire circumferential direction is pressed against the outer surface of the tread rubber body 17 to rotate the tire member 10, and the trim roller 19 is axially moved. This is done by slowly moving to. As a result, the tread rubber body 17 is deformed and closely adhered along the outer surface of the tread region of the main body 20 shaped in a toroidal shape.

  Next, a winding process is performed in which the protruding portion 21 of the tire member 10 that protrudes outward in the axial direction from the bead core 15 is wound around the side region 20 </ b> S of the main body portion 20. In the present embodiment, the protruding portion 21 includes the carcass ply 12 and the sidewall rubber 13. The side region 20S of the main body 20 is a region where the protruding portion 21 is rolled up and bonded.

  In the winding process, as shown in FIGS. 10 and 11, the side region 20S of the main body 20 is tilted and held in the axially inner side (tire equator side) toward the radially outer side, and the slide member 7 is held in the main body. Move to the unit 20 side. As a result, the roller 8B of the swing arm 8 goes up the slope 3b1 of the outer base 3b to reach the side region 20S of the main body 20, and from the radially inner side to the outer side along the slope of the outer surface of the side region 20S. Moving. Along with the rolling of each roller 8B, the buffer sheet 9 (sheet base portion 9A) extending between the roller 8B and the protruding portion 21 is wound around the roller 8B spaced in the circumferential direction. It is extended and expanded in diameter (of course, extending in the tire circumferential direction).

  At this time, the buffer sheet 9 can suppress the occurrence of excessive distortion in the sheet base portion 9A by further stretching the band-shaped portion 9B having a lower rigidity than the sheet base portion 9A. Further, the side wall rubber 13 and the like wound around the sheet base portion 9 </ b> A are also stretched together with the buffer sheet 9 due to the circumferential and radial expansion of the sheet base portion 9 </ b> A. Then, the protruding portion 21 of the tire member 20 is sequentially wound around the side region S of the main body portion 20 through the cushioning sheet 9.

  12 is a schematic cross-sectional view in the circumferential direction at the position XX in FIG. Since the sheet base portion 9A of the cushioning sheet 9 is continuous in the tire circumferential direction, the gap 24 between the rollers 8B and 8B moving from the inside in the radial direction to the outside can be closed. Further, the sheet base portion 9A is stretched by receiving a tensile stress in the circumferential direction to increase the rigidity. For this reason, the side wall rubber 13 of the protruding portion 21 is pressed toward the main body portion 20 by the highly rigid shock absorbing sheet 9 extending between the adjacent rollers 8B, 8B, and the protrusion as before is suppressed. . Such a buffer sheet 9 relaxes the stress between the sidewall rubber 13 and the roller 8B and acts on the protruding portion 20 as compared with the conventional mechanical winding method in which the protruding portion 21 is wound only by the roller 8B. Disperse the strain to be spread widely in the tire circumferential direction. Therefore, it is possible to effectively suppress the formation of a large undulation on the outer surface of the raw tire t.

  Here, although not particularly limited, if the thickness T1 of the sheet base portion 9A is too large, sufficient elongation cannot be obtained at the time of winding, and productivity may be deteriorated. From such a viewpoint, the thickness T1 of the sheet base 9A is preferably 4.0 mm or less, more preferably 3.5 mm or less.

  Similarly, if the thickness T2 of the band-shaped portion 9B is too small, there is a possibility of breaking, and if it is too large, sufficient elongation cannot be obtained and the productivity may be deteriorated. From such a viewpoint, the thickness T2 of the band-shaped portion 9B is preferably 1.0 mm or more, more preferably 1.5 mm or more, and the upper limit is preferably 4.0 mm or less, more preferably 3. 5 mm or less is desirable.

  And after winding up all the protrusion parts 20, the rocking | swiveling arm 8 can return to the said initial state, reducing the diameter of the buffer sheet 9, by moving the slide member 7 to an axial direction outer side. The green tire t formed by obtaining the winding process is later vulcanized to produce a pneumatic tire.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments illustrated, and it is needless to say that various modifications can be made without departing from the scope of the present invention. For example, the buffer sheet 9 can be implemented in various modes as long as it can be wound around the roller 8B to expand its diameter. For example, as shown in FIG. 12, the end edge 9 i on the inner side in the tire axial direction of the cushioning sheet 9 is wound around the roller 8 </ b> B of the swing arm 8, for example, on the rear base 3 b or the sleeve 6 of the bead core holding device 3. It may be fixed.

In order to confirm the effect of the present invention, 20 raw tires (tyre size “215 / 60R16 95H”) were respectively molded according to the winding process specifications shown in Table 1, and the undulation shown in FIG. The recess depth d of the tire and the uniformity of the vulcanized tire were measured. As the buffer sheet, vulcanized rubber having the following composition was used.
Butyl rubber 95 parts by weight Chloroprene rubber 5 parts by weight Carbon black 40 parts by weight Stearic acid 3 parts by weight Aroma oil 5 parts by weight Zinc oxide 5 parts by weight

  The recess depth d was measured at three locations on the tire circumference at bead portions on both sides of each green tire, and the total average value thereof was defined as the recess depth of the tire.

  Uniformity was measured for TFV and RFV according to JASO C607: 2000 uniformity test conditions using a cornering tester. The evaluation speed was 10 km / h. The result was expressed as an index where the average value (N) of 20 tires was calculated in each example, and the value of the comparative example was taken as 100. The larger the value, the better. The test results are shown in Table 1.

  As a result of the test, it was confirmed that the depth of the concave portion was significantly reduced in the raw tire of the example. Based on this, it was confirmed that the uniformity of the vulcanized pneumatic tire was also greatly improved compared to the comparative example.

It is a fragmentary perspective view of the raw tire shaping | molding apparatus of this embodiment. FIG. It is sectional drawing which shows the state which changed the shaping | molding drum. FIG. 4 is an AA end view of FIG. 3. (A) is the partial expanded view of a buffer sheet, (b) is the BB sectional drawing, (c) is the CC sectional drawing. It is sectional drawing which shows the state which wound the tire member around the raw tire shaping | molding apparatus. It is sectional drawing which shows the state which hold | maintained the bead core with the core receiving part of the bead core holding | maintenance apparatus. It is sectional drawing which shows the process of shape | molding a main-body part. It is sectional drawing which shows a trimming process. It is sectional drawing explaining the winding-up process of a protrusion part. FIG. It is the circumferential cross-sectional schematic of the XX position of FIG. It is sectional drawing of the winding apparatus explaining other embodiment of this invention. It is sectional drawing explaining the conventional winding process. (A) is a perspective view of a green tire, (b) is the AA sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Raw tire shaping | molding apparatus 2 Molding drum 3 Bead core holding | maintenance apparatus 4 Hoisting device 7 Slide member 8 Swing arm 8A Arm main body 8B Roller 9 Buffer sheet 9A Sort base 9B Band-shaped part 9i End edge 9o of the buffer sheet 9 in the tire axial direction The outer edge 10 of the cushioning sheet 9 in the axial direction of the tire 10 The tire member 12 The carcass ply 13 The side wall rubber 15 The bead core 20 The main body portion 20S The side region 21 of the main body portion The protruding portion t The raw tire

Claims (5)

A main body portion extending in a toroidal shape between a pair of bead cores held by the bead core holding device, and a cylindrical shape that continues to the main body portion and passes between the bead core and the bead core holding device and protrudes outward in the tire axial direction of the bead core. A tire member hoisting device for hoisting the overhanging portion of the tire member having an overhanging portion onto a side region of the main body portion,
A slide member provided on both outer sides in the axial direction of the bead core holding device and capable of moving toward and away from the main body by moving in the axial direction;
An arm body having an end on the outer side in the tire axial direction pivotably attached to the slide member so as to extend radially in the tire axial direction through the inner peripheral surface side of the protruding portion and be able to rise radially; A plurality of swing arms spaced in a circumferential direction including a roller pivotally attached to an end, and continuously extending in the tire circumferential direction between the protruding portion and the swing arm By including a buffer sheet made of an elastic material that prevents contact between the protruding portion and the swing arm,
As the slide member moves toward the main body, the shock-absorbing sheet is wound around each of the rollers moving from the inside to the outside in the radial direction along the main body to expand the diameter in the radial direction. A rolling-up device for a tire member, wherein the protruding portion is wound on a side region of the main body through a seat. The shock absorbing sheet has a tire axially outer edge fixed to the slide member or the arm body,
The tire member hoisting device according to claim 1, wherein an edge on an inner side in the tire axial direction is fixed to a stationary member.   The cushioning sheet has a sheet base portion extending continuously in the tire circumferential direction, and a plurality of band shapes that extend from the seat base portion in the tire axial direction and are spaced apart in the tire circumferential direction so as to extend more easily than the seat base portion. The tire member hoisting device according to claim 1 or 2, comprising a portion.   The tire member hoisting device according to claim 3, wherein the band-shaped portion is provided with a plurality of grooves extending in the tire circumferential direction on at least one surface.   A method for manufacturing a pneumatic tire, comprising the step of winding the protruding portion of the raw tire using the hoisting device according to any one of claims 1 to 4.

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