JP2013071288A - Method and device for folding back tire component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely oscillate folding-back arms 42 to a radial inner limit, while saving manpower.SOLUTION: This tire component folding method includes: detection sensors 61 detecting oscillating positions of the folding-back arms 42; and a determination means determining whether or not the folding-back arms 42 are oscillated to the radial inner limit on the basis of a detection result from the detection sensors 61. When the folding-back arms 42 are not returned to the radial inner limit due to interference etc. with the adjacent folding-back arms 42, this situation can be securely detected by the detection sensors 61 and the determination means to take predetermined measures. No worker is required for monitoring the situation, thereby enabling manpower saving.

Description

    The present invention relates to a method and an apparatus for folding back a tire constituent member that folds a folded portion of a tire constituent member located on both outer sides in the axial direction from a bead along a main body portion that bulges and deforms radially outward.

    As a conventional method and apparatus for turning back tire constituent members, for example, those described in Patent Document 1 below are known.

JP 2005-319598 A

  This is a pair of movable bodies that are movable in the axial direction of a tire constituent member having a main body portion that bulges and deforms radially outward between a pair of beads, and that is installed on both axial outer sides of the beads, A plurality of folding arms that are connected to each movable body so as to be able to swing in the radial direction about the base end portion, extend toward the tire constituent member, and are arranged apart from each other in the circumferential direction, and a radius to the folding arm By applying an urging force constantly inward in the direction, a plurality of folding rollers rotatably supported at the tip of each folding arm, and moving each movable body so as to approach the tire constituent member. While the roller is in rolling contact with the folded portion of the tire constituent member positioned on both outer sides in the axial direction from the bead, the folding arm is swung radially outward against the urging force. And in, the folded portion is obtained by a folded drive mechanism along the body portion.

    Then, the tire constituent member whose folded portion is folded by the folding device as described above is then pressed against a turned stitching roller against the folded portion while being rotated around the central axis. Stitching is performed and air remaining between the folded portion and the main body is discharged. However, the folded arms described above are radially inward due to, for example, interference between adjacent folded arms or pinching of foreign matter. If it does not return to the limit, the stitching roller may contact the folding arm during the stitching operation.

  In order to avoid such a situation, conventionally, an operator always monitors the operating state of the folding device, and when a contact accident as described above is likely to occur, the folding device is stopped and the folding arm is moved in the radial direction. Although it was returned to the inner limit, if it is constantly monitored by the worker in this way, it is necessary to place the worker on the folding device, so the labor cost is high, and if the skill level of the worker is low There was a problem that monitoring sometimes failed.

  An object of the present invention is to provide a method and an apparatus for turning a tire constituent member that can ensure the swinging of the turning arm to the inner limit in the radial direction while saving labor.

    Such an object is to firstly divide a cylindrical tire constituent member into a main body portion located between a pair of beads and a folded portion located on both outer sides in the axial direction from the beads, and the main body portion. The base end portion by bulging and deforming the outer side in the radial direction and moving the pair of movable bodies installed on both outer sides in the axial direction of the bead in the axial direction so as to approach the tire constituent member by the driving mechanism. A plurality of folded arms connected to each movable body and extending toward the tire constituent member and spaced apart from each other in the circumferential direction are attached to the inner side in the radial direction that is always applied from the applying member to the folded arm. A plurality of folding rollers rotatably supported at the distal end of the folding arm are brought into rolling contact with the folding portion while swinging radially outward with the base end as a center against the force. And the step of folding the folded portion along the main body, and the movable body is moved away from the tire constituent member by the drive mechanism, thereby swinging the folded arm radially inward by the urging force of the applying member. And a step of detecting the swinging position of the folding arm by the detection sensor and determining whether or not the folding arm has swung to the inner limit in the radial direction based on the detection result from the detection sensor. This can be achieved by the method of turning the tire constituent member.

  Secondly, a pair of movable bodies that are movable in the axial direction of a tire constituent member having a main body portion that bulges and deforms radially outward between the pair of beads, and are installed on both outer sides in the axial direction of the beads, A plurality of folding arms that are connected to each movable body so as to be able to swing in the radial direction about the base end portion, extend toward the tire constituent member, and are arranged apart from each other in the circumferential direction, and a radius to the folding arm By applying an urging force constantly inward in the direction, a plurality of folding rollers rotatably supported at the tip of each folding arm, and moving each movable body so as to approach the tire constituent member. While the roller is in rolling contact with the folded portion of the tire constituent member located on both outer sides in the axial direction from the bead, the folding arm is swung radially outward against the biasing force. A drive mechanism for folding the folding portion along the main body, a detection sensor for detecting the swing position of the folding arm, and the folding arm swings to a radially inner limit based on a detection result from the detection sensor. This can be achieved by a turning device for a tire constituent member provided with a judging means for judging whether or not.

  In the present invention, a detection sensor for detecting the swing position of the return arm and a determination means for determining whether the return arm swings to the radially inner limit based on the detection result from the detection sensor. Therefore, when the folded arm does not return to the inner limit in the radial direction due to interference between adjacent folded arms, the detection sensor and the determination means can reliably recognize this and take a predetermined response, At this time, since a worker to be monitored is unnecessary, labor saving can be achieved.

  In addition, when the type of the tire constituent member is changed, the position of the inner limit in the radial direction of the folding arm changes. Even in this case, if the configuration is as described in claim 2, the operator can set the reference value. There is no need to re-input, and it is possible to cope with size variations without problems. Furthermore, if constituted as in claim 3, it is possible to avoid the stoppage of the apparatus when an erroneous detection or interference between the folded arms is naturally repaired. According to the fifth aspect of the present invention, the swing position of the folding arm can be detected with high accuracy. Furthermore, if constituted as in claim 6, it is possible to detect the swinging position of the folding arm with high accuracy while being small and inexpensive. According to the seventh aspect of the present invention, since the detection position by the detection sensor is substantially equidistant from the elastic band and the folding roller, the folding arm swings to some extent from the radially inner limit to the radially outer side. Even if the sensor stops at the position, the detection sensor does not detect the elastic band and the folding roller, and erroneous detection can be reliably prevented.

It is the schematic plan view in which a part showing Embodiment 1 of this invention was drawn with the block. It is II sectional view taken on the line of FIG. 1 when a return | turnback arm is an expansion state. It is the II-II arrow sectional view of Drawing 2 when a return arm is a closed state.

Embodiment 1 of the present invention will be described below with reference to the drawings.
In FIGS. 1, 2, and 3, reference numeral 11 denotes a tire forming drum for forming a green tire for a pneumatic tire to be mounted on a passenger car, a bus or a truck. The tire forming drum 11 has a horizontal hollow main shaft 12. The main shaft 12 can be rotated around the axis by receiving a driving force from a driving unit (not shown). In the main shaft 12, a screw shaft 13 that is coaxial with the main shaft 12 and is driven and rotated separately from the main shaft 12 is loosely fitted. 14 is formed. Reference numeral 15 denotes a connecting block to which nuts 16 that are respectively screwed into the male threads 14 of the screw shaft 13 are fixed. The connecting block 15 passes through a plurality of slits 17 formed in the main shaft 12 and extending in the axial direction.

  Reference numeral 21 denotes a substantially cylindrical slider which is fitted to the outer sides of both sides in the axial direction of the main shaft 12 so as to be movable in the axial direction, and the connecting blocks 15 are connected to these sliders 21, respectively. As a result, when the screw shaft 13 rotates, these sliders 21 are moved in the axial direction by an equal distance in the reverse direction by the male screw 14 which is a reverse screw, and are moved closer to and away from each other. A plurality of radially extending guide grooves 22 are formed in the axially inner end portion of the slider 21 so as to be separated from each other in the circumferential direction, and a bead lock segment 23 is inserted in each guide groove 22 so as to be movable in the radial direction. Yes. Each of the bead lock segments 23 is formed with a receiving portion 24 projecting outward in the axial direction at the radially outer end portion, and a turn-back roller, which will be described later, can be placed on the inclined surface having an arc shape. .

  Reference numeral 27 denotes a cylinder chamber formed in each slider 21, and each cylinder chamber 27 is partitioned into an inner chamber 27a and an outer chamber 27b by a piston 28 slidably accommodated in the cylinder chamber 27. Inner ends of a plurality of links 29 are connected to an extending portion 28 a extending inward in the axial direction of the piston 28, and outer ends of the links 29 are connected to the bead lock segment 23. When a high-pressure fluid is supplied to the inner chamber 27a from a fluid source (not shown), the piston 28 moves outward in the axial direction to move the bead lock segment 23 radially inward, while the outer chamber 27b moves to the outer chamber 27b. When high pressure fluid is supplied, the piston 28 moves inward in the axial direction and moves the bead lock segment 23 outward in the radial direction.

  G is a tire intermediate body in the middle of forming a green tire, and this tire intermediate body G is composed of, for example, a carcass layer 32 in which a reinforcing cord is embedded and side treads 33 preset at both ends of the carcass layer 32. The tire component 34 is composed of a pair of beads 36 having a ring shape with a filler 35 attached thereto. And such a tire intermediate body G is shape | molded as follows, for example roughly. That is, a green case in which a bead 36 with a filler 35 is set on the outer side of a carcass layer 32 having a cylindrical shape with a side tread 33 preset therein is carried into the tire molding drum 11 and fitted to the outer side, and bead lock As described above, the segment 23 is synchronously moved outward in the radial direction and the bead 36 is gripped from the inner side in the radial direction. Thus, the tire constituent member 34 has a main body portion 34a located between the beads 36 and a shaft from the bead 36. It divides into the folding | turning part 34b located in the direction both sides.

  Thereafter, while supplying air into the main body 34a of the tire component 34, the screw shaft 13 is rotated to move the slider 21 and the bead lock segment 23 integrally in the axial direction (toward the axial center). Thus, when they are brought close to each other, the main body portion 34a bulges outward in the radial direction between the pair of beads 36 and deforms so that the meridian cross section is substantially arcuate. At this time, the folded portions 34b on both outer sides in the axial direction from the bead 36 remain in a cylindrical shape, but are then folded along the main body portion 34a to form the tire intermediate G, as will be described later. In this embodiment, a pair of beads 36 are arranged, but two or more pairs may be arranged, and these beads 36 only need to form a pair. Further, in the present invention, the tire tread member 34 may not include the side tread 33. In this case, the side tread 33 is moved in the axial direction of the main body 34a after the folded portion 34b described later is folded. Affixed to both sides.

  Reference numeral 40 denotes a ring-shaped fixed piston formed on the outer surface of the central portion in the axial direction of each slider 21, and a pair of substantially cylindrical shapes installed outside the fixed piston 40 on both outer sides in the axial direction of the bead 36. A movable body 41 is fitted so as to be movable in the axial direction of the tire intermediate G (tire component 34). The base ends (axially outer ends) of a plurality of folding arms 42 arranged at equal angular intervals in the circumferential direction are connected to the outer ends in the axial direction of the movable bodies 41 via pins 43 so as to be rotatable. As a result, the folding arms 42 can swing in the radial direction around the base end portion that is the connection point (pin 43) with the movable body 41.

  These folding arms 42 extend substantially in the axial direction from the base end portion (pin 43) toward the tire intermediate body G (tire constituent member 34), and at the tip end portion (inner end portion in the axial direction). A plurality of folding rollers 44 (the same number as the folding arms 42) rotating around an axis parallel to the tangent to the outer periphery of the main body 34a are supported so as to be freely rotatable. 45 is fitted to the outside of all the folding arms 42 respectively connected to each movable body 41, and is a ring-shaped elastic band, for example, a rubber band, a spring, etc., which is locked to the longitudinal center of the folding arm 42. These application members 45 are provided with a biasing force that is always applied radially inward to the folding arm 42 to swing the folding arm 42 in the closing direction. .

  Here, a cylindrical cylinder chamber 47 is formed between the slider 21 and the movable body 41. These cylinder chambers 47 are divided into an inner chamber 47a and an outer chamber 47b by a fixed piston 40. Yes. When the high pressure fluid is supplied from the fluid source (not shown) to the outer chamber 47b and the movable body 41 moves to the outer limit in the axial direction indicated by the phantom line in FIG. The folding roller 44 engages with the arc-shaped inclined surface of the receiver 24 and is supported from the inner side in the radial direction by the bead lock segment 23. .

  On the other hand, when the high-pressure fluid is supplied from the fluid source to the inner chamber 47a, the movable body 41 and the folding arm 42 are synchronously moved inward in the axial direction so as to approach the tire intermediate body G (tire component 34) integrally. However, at this time, each folding arm 42 swings to expand outward in the radial direction while resisting the urging force of the applying member 45 around the base end portion, while the folding roller 44 rolls into contact with the folding portion 34b. Accordingly, the folded portion 34b of the tire constituent member 34 located on the outer side in the axial direction from the bead 36 is moved along the main body portion 34a outside the main body portion 34a with the filler 35 interposed therebetween. And the tire intermediate body G is formed. At this time, since the applying member 45 is stretched by swinging the folding arm 42 radially outward, the elastic restoring force (biasing force) is applied to the folding arm 42 to swing the folding arm 42 radially inward. As a result, the folding roller 44 is pressed against the folding portion 34b, and the folding portion 34b in the rolling path of the folding roller 44 is pressed against the main body portion 34a and the filler 35.

  The fixed piston 40, the cylinder chamber 47, and the fluid source as a whole move the movable body 41 so as to approach the tire intermediate body G (the tire constituent member 34), whereby the folding roller 44 is brought into rolling contact with the folding portion 34b. While turning the folding arm 42 to the outside in the radial direction against the urging force of the applying member 45, the folding portion 34b of the tire constituent member 34 positioned axially outside the bead 36 extends along the main body 34a. The drive mechanism 48 that turns back is configured. In the present invention, a screw mechanism, a rack and pinion mechanism, or the like may be used as the drive mechanism.

  Further, in the present invention, when the folded portion 34b of the tire constituent member 34 is folded back at the axially inner end portion of each slider 21, it expands to the pressing force by the folding roller 44 from the axially inner side of the main body portion 34a. A rigid body that opposes the pressing force by the folding roller 44 from the inner side in the axial direction of the main body 34a by disposing an internal bladder that stretches against it or moves radially outward in synchronization with the folding roller 44 The core body constituted by the above may be arranged, and in this way, the folding portion 34b can be more reliably folded.

  Further, in the present invention, as the folding arm 42 swings radially outward and expands, the applying member 45 is moved axially outward, while the folding arm 42 swings radially inward and closes. Accordingly, the applying member 45 may be moved inward in the axial direction, and in this way, the pressing force against the folded portion 34b of the folding roller 44 by the urging force (elastic restoring force) of the applying member 45 is made uniform. As a result, it is possible to easily suppress a situation in which the pressing force of the folding roller 44 becomes excessive at the end of the folding portion 34b and the streak of the folding roller 44 is formed on the outer surface of the folding portion 34b.

  Reference numeral 51 denotes a pair of stitching means installed on both outer sides in the axial direction of the tire intermediate G. These stitching means 51 have support plates 52 that can move in the axial direction and the radial direction, respectively. A stitching roller 53 whose outer peripheral surface can be brought into rolling contact with the outer surface of the tire intermediate G is rotatably supported. When the folded portion 34b of the tire constituent member 34 is folded and the tire intermediate body G is formed as described above, the main shaft 12, the slider 21, and the tire intermediate body G are integrally rotated, while the stitching means. When 51 is actuated, the stitching roller 53 is pressed against the folded portion 34b of the tire intermediate G and moves to the outside in the radial direction while rotating. As a result, the stitching roller 53 moves between the folded portion 34b, the filler 35, and the main body portion 34a. The remaining air is discharged.

  Here, after the tire intermediate G is formed as described above, when the main shaft 12 and the slider 21 are rotated for stitching, the turning arm 42 is turned radially outward about the pin 43 by the centrifugal force of the rotation. When the swinging arm 42 is allowed to swing, the stitching roller 53 of the stitching means 51 and the folding arm 42 interfere with each other, and the operation cannot be continued. Therefore, in this embodiment, annular outer flanges 56 projecting outward in the radial direction are integrally formed at the outer end portions in the axial direction of the sliders 21 described above, and the movable body 41 serves as the shaft of the outer flanges 56. A ring-like shape that is positioned axially outside the axially outer end of the folding arm 42 when moved to the outer limit in the axial direction, and that protrudes inward in the axial direction coaxially with the main shaft 12 on the axially inner surface of the outer flange 56 The stopper body 57 is fixed, and on the other hand, a stopper body 58 that protrudes outward in the axial direction is formed at the axially outer end of each folding arm 42 facing the stopper body 57, respectively.

  The inner surface of the stopper body 58 in the radial direction is located outside the radial direction of the stopper body 57 when the movable body 41 and the folding arm 42 move to the outer limit in the axial direction and the folding arm 42 swings to the inner limit in the radial direction. When the stopper body 58 contacts the stopper body 57 as described above, the stopper body 57 does not move even when the main shaft 12, the slider 21, etc. rotate during the stitching work by the stitching means 51 as described above. In order to strongly restrict the movement of the stopper body 58 in the radial direction, that is, the swinging of the folding arm 42 in the radial direction, the folding arm 42 continues to be held at the radially inner limit, and the stitching means 51 is stitched. Interference between the roller 53 and the folding arm 42 is reliably prevented. However, when the stopper bodies 57 and 58 as described above are provided, any one of the folding arms 42 may be in the radial direction due to, for example, interference between adjacent folding arms 42, pinching of foreign matter, variation in the internal pressure of the tire intermediate G, etc. When it stops in the middle of swinging to the inner limit and cannot return to the inner limit in the radial direction, the stopper body 58 of the folding arm 42 is caught by the stopper body 57 and the axially outer limit of the movable body 41 and all the folding arms 42 is reached. Stop moving to the middle (immediately before).

  Thus, when the movable body 41 cannot reach the outer limit in the axial direction and stops halfway, the folding roller 44 is positioned above the receiver 24. As a result, all the folding arms 42 reach the inner limit in the radial direction. Immediately before starting, that is, in a state where it is slightly expanded, the oscillation stops. When the stitching operation described above is started in such a state, the folding arm 42 and the stitching roller 53 of the stitching means 51 interfere with each other. In this embodiment, the folding arm 42 A detection sensor 61 for detecting the swing position is provided, and based on the detection result from the detection sensor 61, it is determined whether or not the folding arm 42 swings to the inner limit in the radial direction. It was provided.

  As a result, when the folding arm 42 has not returned to the inner limit in the radial direction due to interference between adjacent folding arms 42, the detection sensor 61 and the determination means 62 reliably recognize this and perform the following predetermined response. Moreover, at this time, an operator to be monitored becomes unnecessary and labor saving can be achieved. Here, when it is determined that the determination by the determination means 62 is impossible, a determination signal is output from the determination means 62 to the alarm device 63, and the alarm device 63 generates an alarm sound and lights a warning light. The operator is alerted, and the operation of the tire forming drum 11 and the stitching means 51 is urgently stopped. As described above, when it is determined that the determination by the determination unit 62 is impossible, it is preferable to perform the same determination operation again by the determination unit 62 after a predetermined time has elapsed from the determination operation. The reason for this is that if the determination operation is repeated twice in this way, it is possible to avoid the stoppage of the apparatus when an erroneous detection or interference between the folding arms 42 is naturally repaired.

  In this case, if both determination operations are impossible, the operation of the tire forming drum 11 and the stitching means 51 is stopped as described above. On the other hand, when it is determined that the determination operation by the determination means 62 is acceptable, the next operation, here, the stitching operation is started. Here, at least one detection sensor 61 is disposed on each side of the tire intermediate G corresponding to the folding arm 42, and one detection sensor 61 is disposed on each detection sensor 61. Any one of them and the axis of the tire constituent member 34 (coaxial with the rotation axis of the main shaft 12 of the tire forming drum 11 supporting the tire constituent member 34) are positioned.

  Even if at least one folding arm 42 cannot return to the radially inner limit as described above, all the other folding arms 42 are similarly set to the radially inner limit by the stopper body 58 being caught by the stopper body 57. If the swing position of any one of the folding arms 42 arranged on both sides of the tire intermediate body G is detected, the other folding arms 42 are brought to the radially inner limit. This is because it is possible to detect whether or not the apparatus has returned, and the structure of the entire apparatus can be simplified. Further, as described above, if one of the folding arms 42 and the axis of the tire constituent member 34 are both positioned on the detection line of each detection sensor 61, the swing position of the folding arm 42 can be set with high accuracy. Can be detected. Such a detection sensor 61 may be installed on the outer side in the radial direction of one of the folded arms 42 by, for example, being attached to a fixed frame (not shown) of the stitching means 51 via a bracket 64.

  Further, as the detection sensor 61 described above, a capacitance sensor that detects the swing position of the folding arm 42 by measuring the capacitance between the detection sensor 61 and the folding arm 42, and the folding arm from the detection sensor 61. By measuring the time it takes for the laser light applied to 42 to be reflected by the folding arm 42 and returning to the detection sensor 61, the laser sensor that detects the swing position of the folding arm 42, the detection sensor 61 to the folding arm 42 By measuring the time until the irradiated ultrasonic wave is reflected by the folding arm 42 and returned to the detection sensor 61, an ultrasonic sensor or the like that detects the swing position of the folding arm 42 can be used. An ultrasonic sensor that can detect the swing position of the folding arm 42 with high accuracy while being small and inexpensive is suitable.

  Further, as described above, when the applying member 45 is an elastic band that extends and contracts and is fitted to the outside of all the folding arms 42, the folding arm 42 at the intermediate portion between the elastic band and the folding roller 44 is detected by the detection sensor 61. It is preferable to detect. The reason is that the detection position of the detection sensor 61 is substantially equidistant from the applying member 45 (elastic band) and the folding roller 44, so that the folding roller 44 swings to some extent from the radially inner limit to the radially outer side. This is because the detection sensor 61 does not detect the applying member 45 (elastic band) and the folding roller 44 even if stopped, and as a result, erroneous detection can be reliably prevented.

  Further, in the tire molding drum 11 as described above, the type of the tire intermediate G (tire constituent member 34) to be molded is changed as necessary, and thus the tire intermediate G (tire constituent member 34) is changed. When there is a change in the type, the position of the inner limit in the radial direction of the folding arm 42 usually changes. For this reason, as described above, whenever the type of the tire intermediate G (tire component 34) is changed, that is, immediately before the start of the folding operation of the changed tire component 34, the detection sensor 61 radially inwards. The folding position of the folding arm 42 located at the limit is detected, and the detection result is stored as a reference value in the storage unit of the determination means 62, and the reference value and the folding arm 42 are pivoted inward in the radial direction. It is preferable to determine whether or not the folding arm 42 has swung to the inner limit in the radial direction by comparing the detection result from the detection sensor 61 during movement with the determination unit 62. In this way, even if the type of the tire component 34 is changed, it is not necessary for the operator to re-enter the reference value, and it is possible to cope with variations in size without any problem. In the present invention, every time a new tire constituent member 34 of the same type is carried into the tire molding drum 11, the detection arm 61 swings the folding arm 42 located at the radially inner limit. The position may be detected, and the detection result may be stored in the storage unit of the determination unit 62 as a reference value.

Next, the operation of the first embodiment will be described.
When a green tire is molded using the tire molding drum 11 as described above, first, the tire-shaped member 34 having a cylindrical shape is transported to the tire molding drum 11 together with the beads 36 with the filler 35, and the tire molding is performed. Fits to the outside of the drum 11. Next, the diameter of the bead lock segment 23 is expanded and the bead 36 is gripped from the inside. At this time, the tire constituent member 34 is divided into a main body portion 34a and a folded portion 34b. Next, the slider 21 and the bead lock segment 23 are brought close to each other while supplying air into the main body 34a, so that the main body 34a is bulged and deformed outward in the radial direction until the cross section is substantially arc-shaped. The folded portion 34b remains cylindrical.

  Next, the movable body 41 and the folding arm 42 are moved inward in the axial direction so as to approach the tire constituent member 34 by the drive mechanism 48. At this time, each folding arm 42 swings so as to expand radially outward with the base end portion (pin 43) as a center, and the folding roller 44 moves radially outward while rolling and contacting the folding portion 34b. The folded portion 34b is folded around the bead 36 along the outside of the filler 35 and the main body portion 34a, and the tire intermediate G is formed. At this time, each folding roller 44 is pressed against the folding portion 34b by the urging force imparted from the applying member 45 via the folding arm 42. Therefore, the folding portion 34b on the rolling path of the folding roller 44 is the filler 35, the main body portion. Strongly crimped to 34a.

  When the folding of the folding portion 34b is completed in this way, the drive mechanism 48 is activated, and the movable body 41 and the folding arm 42 are moved outward in the axial direction so as to be separated from the tire intermediate G (the tire constituent member 34). At this time, each folding arm 42 swings so as to be closed inward in the radial direction around the base end (pin 43) by the urging force of the applying member 45, and the folding roller 44 rolls and contacts the folding portion 34b in the radius. Move inward direction. At the same time, the stitching roller 53 of the stitching means 51 moves toward the stitching start position. At this time, since both operations are performed simultaneously, the work efficiency is improved. When any of the folding arms 42 cannot return to the inner limit in the radial direction due to interference between adjacent folding arms 42 during the swinging of the folding arms 42, the stopper body 58 of the folding arm 42 is a stopper. The movable body 41 and all the folding arms 42 are hooked on the body 57 and stop moving in the axial direction on the way (immediately before the outer limit in the axial direction), so that all the folding arms 42 reach the inner limit in the radial direction. Oscillation stops just before starting, that is, in a slightly expanded state

  When the folding arm 42 swings, each detection sensor 61 detects the swing position of the specific folding arm 42. However, as described above, the folding arm 42 swings radially inward. When stopped, the folding arm 42 cannot reach the inner limit in the radial direction even at a specified time, so the detection sensor 61 detects that the folding arm 42 remains at a position radially outside the inner limit in the radial direction, The detection result is output to the determination means 62. As a result, the determination means 62 determines that the folding arm 42 does not swing to the inner limit in the radial direction based on the detection result from the detection sensor 61, that is, determines that it is impossible. Makes a determination again based on the detection result from the detection sensor 61 after a lapse of a predetermined time, that is, repeats the determination work twice, and outputs an unacceptable signal to the alarm device 63 if the determination is not allowed twice. The alarm sound is generated and the warning lamp is turned on, while the operation of the tire forming drum 11 and the stitching means 51 is urgently stopped.

  On the other hand, when it is determined that the determination operation by the determination unit 62 is acceptable, a start signal is output from the determination unit 62 to the stitching unit 51. In this way, the swing position of the folding arm 42 is detected by the detection sensor 61, and the detection result is output to the determination means 62. At this time, the determination means 62 determines whether the folding arm 42 is radially inward based on the detection result. It is determined whether or not it has swung to the limit. When the determination is acceptable as described above, the main shaft 12, the slider 21, and the tire intermediate G rotate integrally, while the stitching means 51 is activated and the stitching roller 53 at the stitching start position is changed to the tire. The intermediate body G moves outward in the radial direction while being pressed against the folded portion 34b. As a result, the stitching roller 53 performs stitching on the folded portion 34b, and discharges the air remaining between the folded portion 34b, the filler 35, and the main body portion 34a.

  At this time, since the radially inner side surface of the stopper body 58 is in contact with the radially outer surface of the stopper body 57, the stopper body 57 moves inward in the radial direction of the stopper body 58, that is, radially outward of the folded arm 42. Thus, the interference between the stitching roller 53 of the stitching means 51 and the folding arm 42 is reliably prevented. Next, a cylindrical belt tread band is carried outside the tire intermediate G, and the slider 21 and the bead lock segment 23 are moved further inward in the axial direction to approach each other. As a result, the tire intermediate body G is deformed into a substantially toroidal shape, and the radially outer end thereof is pressed against the inner periphery of the belt tread band to form a green tire.

  The present invention can be applied to the industrial field in which a folded portion of a tire constituent member is folded along a main body portion bulged and deformed radially outward.

34 ... Tire component 34a ... Main body
34b ... Folding part 36 ... Bead
41 ... Movable body 42 ... Folding arm
44 ... Folding roller 45 ... Applying member
48 ... Drive mechanism 61 ... Detection sensor
62 ... Judgment means

Claims (7)

    A step of partitioning the cylindrical tire constituent member into a main body portion located between the beads forming a pair and a folded portion located on both outer sides in the axial direction from these beads, and bulging and deforming the main body portion radially outward And a pair of movable bodies installed on both outer sides in the axial direction of the bead in the axial direction so as to approach the tire constituent member by a driving mechanism, the base end portion is connected to each movable body, and the tire constituent member A plurality of folded arms that are arranged in the circumferential direction and are opposed to the radially inward biasing force that is always applied to the folded arm from the applying member. A plurality of folding rollers that are rotatably supported at the tip of the folding arm are brought into rolling contact with the folding portion while swinging radially outward about And the movable body is moved away from the tire constituent member by the driving mechanism, so that the folding arm swings inward in the radial direction by the biasing force of the applying member, and the detection sensor detects the folding arm. Detecting a swing position, and determining whether or not the folding arm swings to a radially inner limit based on a detection result from the detection sensor. Wrapping method.     Each time there is a change in the type of the tire component, the detection sensor detects the swinging position of the folding arm located at the radially inner limit and sets it as a reference value, and the reference value and the radially inner side of the folding arm The tire member folding method according to claim 1, wherein it is determined whether or not the folding arm has swung to the radially inner limit by comparing a detection result from the detection sensor when swinging to the inner side. .     The method for turning back a tire constituent member according to claim 1 or 2, wherein when the determination operation by the determination means is determined to be impossible, the same determination operation is performed again after a predetermined time has elapsed since the determination operation.     A pair of movable bodies that are movable in the axial direction of a tire constituent member having a body portion that bulges and deforms radially outward between a pair of beads, and that are installed on both outer sides in the axial direction of the beads, and A plurality of folded arms that are connected so as to be able to swing in the radial direction about the base end portion, extend toward the tire constituent member, and are spaced apart in the circumferential direction, and are directed radially inward to the folded arms. An application member that constantly applies an urging force, a plurality of return rollers rotatably supported at the tip of each return arm, and each movable body is moved so as to approach the tire constituent member, whereby the return roller is moved to the bead. The rolling arm is swung radially outward against the urging force while being brought into rolling contact with the folded portion of the tire constituent member located on both outer sides in the axial direction, A drive mechanism for folding the return portion along the main body, a detection sensor for detecting the swing position of the return arm, and whether or not the return arm swings to the radially inner limit based on the detection result from the detection sensor. And a determination device for determining whether or not the tire component member folding device is provided.     5. The tire component member folding device according to claim 4, wherein both of the folding arms and the axis of the tire component member are positioned on a detection line of the detection sensor.     The detection sensor is configured by an ultrasonic sensor that is installed on the outer side in the radial direction of the folding arm and detects the swing position of the folding arm by measuring the time until the ultrasonic wave reflected by the folding arm returns. Item 6. The tire component member folding device according to Item 4 or 5.     7. The folding arm at a middle portion between the elastic band and the folding roller is detected by a detection sensor when the applying member is an elastic band that extends and contracts fitted to the outside of all the folding arms. The folding | returning apparatus of the tire structural member in any one of.

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