JP2017080954A - Stitching device and stitching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stitching device and a stitching method capable of quickly and surely press-fitting a tread ring to a raw tire base body, without causing various problems of reducing quality of a tire after molding.SOLUTION: In a stitching device for press-fitting a tread ring to a raw tire base body by pressing while moving the tread ring stuck to an outer peripheral surface of the raw tire base body expanded in a toroidal shape, in the lateral direction by turning a pair of respective stitching rollers to both side edge parts from a central part of the tread ring, the stitching device is constituted so that a plurality of stitching means having the pair of stitching rollers are provided at a substantially equal interval along the circumferential direction of the raw tire base body, and a plurality of stitching means are mutually joined by a link mechanism, and the respective stitching means synchronously move the stitching rollers in the lateral direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stitching apparatus and a stitching method used in a tread ring crimping process.

  In the manufacturing process of a radial tire, a green tire is formed through a tread ring pressing process in which a cylindrical tread ring is pressed and attached to the outer peripheral surface of a green tire base expanded in a toroid shape (for example, a patent) Reference 1).

  4A and 4B are diagrams for explaining a conventional tread ring pressing process, in which FIG. 4A is a sectional view from the front, and FIG. 4B is a side view. In the tread ring crimping step, first, as shown in FIG. 4A, the central portion of the tread ring A is crimped to the top of the raw tire base T expanded in a toroid shape.

  Thereafter, as shown in FIG. 4B, the green tire base T to which the central portion of the tread ring A is bonded is rotated. Then, as shown in FIG. 4 (A), a pair of stitching rollers e that are rotatable and formed in a disc shape are gradually moved in the lateral direction (arrow c in FIG. 4 (A)) along the tread profile. By pressing the tread ring A, the tread ring A is pressure-bonded to the raw tire base T in the order from the center in the width direction to the side edges.

JP 2005-280258 A

  However, in the above-described tread ring crimping process, if the speed of moving the stitching roller e in the lateral direction is increased by shortening the process, the belt-shaped rubber constituting the raw tire base T is turned up or scattered. The tire quality will be greatly affected. As described above, the moving speed of the stitching roller e is limited, and the cycle in the crimping process greatly affects the cycle of the entire manufacturing process.

  In addition, when the pressing force of the stitching roller e is increased during the tread ring pressure bonding, the belt-shaped rubber constituting the green tire base T is scattered and unevenness is generated in the green tire after molding. It becomes difficult to form a green tire.

  Therefore, the present invention provides a stitching apparatus and a stitching method that can quickly and reliably crimp a tread ring to a green tire base without causing various problems that degrade the quality of a molded tire. This is the issue.

The invention described in claim 1
The tread ring attached to the outer peripheral surface of the raw tire base expanded in a toroidal shape is pressed while moving each of the pair of stitching rollers from the central portion of the tread ring toward both side edges in the lateral direction. A stitching device for crimping the tread ring to the green tire base,
A plurality of stitching means including the pair of stitching rollers are provided at substantially equal intervals along the circumferential direction of the green tire base,
A stitching device, wherein a plurality of the stitching means are coupled to each other by a link mechanism, and each stitching means is configured to move the stitching roller synchronously in the lateral direction. is there.

The invention described in claim 2
The former for fixing the raw tire base is provided with a pressure measuring device for measuring the internal pressure of the raw tire base,
The stitching apparatus according to claim 1, further comprising pressure adjusting means for adjusting a pressure with which the stitching roller presses the tread ring based on a measurement result of the pressure measuring device.

The invention according to claim 3
By sticking a tread ring on the outer peripheral surface of the raw tire base expanded in a toroidal shape, and pressing each of the pair of stitching rollers while moving laterally from the center of the tread ring toward both side edges A stitching method in which the tread ring is crimped to the green tire base,
Using the stitching device according to claim 1 or 2,
When the stitching roller presses the tread ring, the stitching rollers of the stitching means arranged at substantially equal intervals along the circumferential direction of the green tire base are moved in synchronization in the lateral direction. In this stitching method, the tread ring is pressure-bonded to the outer peripheral surface of the green tire base.

  According to the present invention, it is possible to provide a stitching apparatus and a stitching method capable of quickly pressing a tread ring to a green tire base without causing various problems that deteriorate the quality of a tire after molding. it can.

It is a front view which shows typically the stitching apparatus which concerns on one embodiment of this invention. It is a front view which shows typically the stitching means 1A in FIG. It is a figure explaining the structure of the former in the inside of a green tire base. It is a figure which shows the conventional stitching apparatus typically.

  Hereinafter, the present invention will be described with reference to the drawings based on embodiments.

1. Background to the Present Invention First, in order to make the cycle of the crimping process faster than before, the inventor increased the number of stitching rollers as compared with the prior art, and arranged each stitching roller along the circumferential direction of the green tire base. The stitching roller is considered to increase the positions where the tread ring is pressed.

  Thus, by arranging a plurality of stitching rollers at substantially equal intervals along the circumferential direction of the raw tire base, the raw tire base material necessary for the stitching roller to press the entire tread ring is rotated. Since the number of times can be reduced, the cycle of the crimping process can be accelerated by quickly crimping the tread ring to the green tire substrate without increasing the moving speed of the stitching roller.

  However, simply installing a plurality of stitching rollers will not move the stitching rollers in the lateral direction, making it impossible to press the tread ring uniformly. A new problem has arisen that molding becomes difficult.

  Therefore, the present inventor has further studied, and a link provided with a universal joint or a drive transmission shaft as means for synchronizing and making constant the lateral movement of a plurality of stitching rollers arranged at equal intervals. The inventor decided to adopt a mechanism and completed the present invention.

  That is, in the stitching device according to the present embodiment, a plurality of stitching means including a pair of stitching rollers are provided at substantially equal intervals along the circumferential direction of the raw tire base, and a plurality of stitches are provided. Since the stitching means are coupled to each other by a link mechanism, and each stitching means is configured to move the stitching roller in a synchronized manner in the lateral direction, the number of stitching rollers can be increased. Although the cycle of the crimping process is fast, a green tire close to a perfect circle can be formed by pressing the tread ring uniformly.

2. Stitching device If the above-mentioned link mechanism can connect a plurality of stitching means provided at substantially equal intervals along the circumferential direction, and can move the stitching rollers of each stitching means in synchronization in the lateral direction. The specific structure is not particularly limited. Hereinafter, an example of the stitching device of the present invention described above will be shown.

  FIG. 1 is a front view schematically showing a stitching apparatus according to the present embodiment, FIG. 2 is a front view schematically showing stitching means 1A in FIG. 1, and FIG. It is a figure explaining the structure of the former | foamer inside.

(1) Overall Configuration In the present embodiment, as shown in FIG. 1, three sets of stitching means 1A, 1B, 1C are arranged at substantially equal intervals along the circumferential direction of the green tire base T. . A motor M is attached to the stitching means 1A, and the stitching roller 1a of the stitching means 1A is laterally moved (direction perpendicular to the paper surface of FIG. 1) by a moving mechanism 1d (see FIG. 2) described later. It is configured to be able to move to.

  The stitching means 1B and 1C are connected to the stitching means 1A by a link mechanism, and the stitching roller 1a of the stitching means 1B and 1C is synchronized with the stitching roller 1a of the stitching means 1A. Configured to move in the direction.

  Moreover, in this Embodiment, each above-mentioned stitching means 1A-1C is attached to the cyclic | annular flame | frame F1. The annular frame F1 is provided with a plurality of tread grounding portions 3 for holding a tread ring (not shown) set on the outer periphery of the raw tire base T. Each tread grounding portion 3 is provided with the raw tire base T. It expands / contracts in accordance with the diameter of each and is configured to properly contact the tread ring.

  A former for fixing the raw tire base T is disposed inside the annular frame F1. As shown in FIG. 3, a compressed air supply hole D is formed in the shaft portion C of the former F, and the bead portion B of the raw tire base T is fixed to the raw tire base T from the supply hole D. The raw tire base T can be expanded in advance in a toroid shape by supplying compressed air to the inner cavity of the tire.

(2) Stitching means As described above, in this embodiment, three sets of stitching means 1A to 1C are arranged at substantially equal intervals. Note that “arranged at substantially equal intervals” means that the respective stitching means 1A to 1C are arranged at substantially equal angles in the circumferential direction, and are shifted by about ± 20 ° from the equal angles. Also good.

  As described above, in the present embodiment, since three sets of stitching means are arranged at substantially equal intervals, the entire tread ring can be pressed with the conventional one-third rotation, and the tread ring can be pressed. The cycle of the crimping process can be made faster than before.

  Each of the three sets of stitching means 1A to 1C is provided with a disk-like stitching roller 1a so as to be rotatable. As shown in FIG. 2, the stitching means 1A has a pair of stitching rollers 1a attached to a stitch cylinder 1c via a rod 1b, and the stitch cylinder 1c is moved laterally by a moving mechanism 1d. It is configured to be able to.

  As shown in FIG. 2, the moving mechanism 1d of the stitching means 1A includes a ball screw 2a composed of a screw shaft 1e and a pair of ball screw nuts 1f, and a motor M that rotationally drives the screw shaft 1e of the ball screw 2a. ing. A stitch cylinder 1c is attached to the moving mechanism 1d via a bracket 4a.

  Specifically, the stitching means 1A extends the rod 1b of the stitch cylinder 1c as shown by an arrow A in FIG. 2 so that the stitching roller 1a presses the tread ring with a predetermined pressure, As indicated by an arrow B, the stitching roller 1a can be moved in the horizontal direction by moving the stitch cylinder 1c in the horizontal direction by the moving mechanism 1d.

  Although not shown, the stitching means 1B and 1C have the same configuration as the stitching means 1A shown in FIG. 2 except that the motor is not attached to the ball screw.

  In this embodiment, three sets of stitching means are provided, but the number of stitching means is not particularly limited as long as it is plural. For example, four sets of stitching means are arranged at substantially equal intervals. May be.

(3) Link mechanism As described above, in the present embodiment, in order to synchronize the operations of the respective stitching means 1A to 1C, the drive transmission shafts 2b, 2c for connecting the stitching means 1A, 1B, 1C. 2d and the universal joint 2e which connects the ends of the two drive transmission shafts 2b and 2c form a link mechanism (see FIG. 1).

  Specifically, one end of the drive transmission shaft 2b is attached to the ball screw nut 1f (see FIG. 2) of the ball screw 2a, and is attached to the stitching means 1A via the bracket 4a. One end of the drive transmission shaft 2c is attached to a ball screw nut (not shown) of the ball screw 2g, and is attached to the stitching means 1B via a bracket 4c. As described above, the drive transmission shafts 2b and 2c are connected by the universal joint 2e. Thereby, the stitching means 1A and 1B are connected via the drive transmission shafts 2b and 2c and the universal joint 2e.

  One end of the drive transmission shaft 2d is attached to the stitching means 1A via a ball screw 2a and a bracket 4a, and the other end is attached to the stitching means 1C via a ball screw 2f and a bracket 4b. Thereby, the stitching means 1A and 1C are connected via the drive transmission shaft 2d.

  In the present embodiment, first, when the motor M of the stitching means 1A is driven to move the stitching roller 1a of the stitching means 1A in the lateral direction, the stitching roller 1a is interlocked with the movement of the stitching roller 1a. The drive transmission shafts 2b and 2d move.

  Thereby, the stitching roller 1a of the stitching means 1C connected to the drive transmission shaft 2d moves in the horizontal direction in synchronization with the stitching roller 1a of the stitching means 1A.

  Similarly, the stitching roller 1a of the stitching means 1B connected to the stitching means 1A via the drive transmission shaft 2b, the universal joint 2e, and the drive transmission shaft 2c is also the stitching roller 1a of the stitching means 1A. Move horizontally in sync with.

  As described above, according to the present embodiment, the stitching rollers 1a can be moved in synchronization in the horizontal direction by connecting the three sets of stitching means 1A to 1C with the link mechanism. Therefore, although a plurality of stitching rollers are provided, a green tire close to a perfect circle can be formed by pressing the tread ring uniformly.

  As described above, according to the present embodiment, a plurality of stitching means are provided at substantially equal intervals along the circumferential direction of the green tire base, so that the tread ring is quickly crimped to the green tire base. Moreover, a high quality green tire close to a perfect circle can be formed by connecting a plurality of stitching means to each other by a link mechanism and moving the stitching roller in a horizontal direction.

(4) Pressure adjusting means In the stitching apparatus according to the present embodiment, a pressure measuring device for measuring the internal pressure of the raw tire base T is provided in the former F for fixing the raw tire base T shown in FIG. In addition, it is preferable that the stitching roller includes a pressure adjusting unit that adjusts the pressure with which the tread ring is pressed based on the measurement result of the pressure measuring device.

  The pressure measuring device is installed in the vicinity of the supply hole D of the shaft portion C of the former F, and transmits, for example, a tire air pressure sensor that measures the internal pressure of the raw tire base T and a measurement result to a control unit that will be described later. Preferably, a wireless pressure gauge with a TPMS transmitter is used.

  The pressure adjusting means includes a control unit that receives a signal from the wireless pressure measuring device. The control unit adjusts the pressing force of the stitching roller based on the measurement result of the pressure measuring device, and controls an electropneumatic regulator that adjusts the pressure of the compressed air supplied to the lumen of the green tire base T.

  By using such pressure adjustment means, the measurement results of the pressure measuring device are fed back to adjust the pressing force to the tread ring, so that the band-shaped rubber is scattered due to excessive pressing force, or after molding It is possible to appropriately form a green tire close to a perfect circle while suppressing the occurrence of unevenness in the green tire.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

1A, 1B, 1C Stitching means 1a, e Stitching roller 1b Rod 1c Stitch cylinder 1d Moving mechanism 1e Screw shaft 1f Ball screw nut 2a, 2f, 2g Ball screw 2b-2d Drive transmission shaft 2e Universal joint 3 Tread grounding portion 4a-4c Bracket A, T1 Tread ring B Bead portion C Shaft portion D Compressed air supply hole F Former F1 Ring frame T Raw tire base M Motor

Claims (3)

The tread ring attached to the outer peripheral surface of the raw tire base expanded in a toroidal shape is pressed while moving each of the pair of stitching rollers from the central portion of the tread ring toward both side edges in the lateral direction. A stitching device for crimping the tread ring to the green tire base,
A plurality of stitching means including the pair of stitching rollers are provided at substantially equal intervals along the circumferential direction of the green tire base,
A stitching device, wherein the plurality of stitching means are coupled to each other by a link mechanism, and each stitching means is configured to move the stitching roller synchronously in the lateral direction. The former for fixing the raw tire base is provided with a pressure measuring device for measuring the internal pressure of the raw tire base,
The stitching apparatus according to claim 1, further comprising pressure adjusting means for adjusting a pressure with which the stitching roller presses the tread ring based on a measurement result of the pressure measuring device. By sticking a tread ring on the outer peripheral surface of the raw tire base expanded in a toroidal shape, and pressing each of the pair of stitching rollers while moving laterally from the center of the tread ring toward both side edges A stitching method in which the tread ring is crimped to the green tire base,
Using the stitching device according to claim 1 or 2,
When the stitching roller presses the tread ring, the stitching rollers of the stitching means arranged at substantially equal intervals along the circumferential direction of the green tire base are moved in synchronization in the lateral direction. The tread ring is pressure-bonded to the outer peripheral surface of the green tire base by performing the stitching method.

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