JPH0645725U - Tire bead holder - Google Patents

Abstract

(57) [Summary] [Structure] The bead holder 13 is in contact with the end surface of the bead 16, and a claw portion protruding from the corresponding contact surface 19 toward the tire forming drum and inserted into the end portion of the bead 16. 17, and the contact surface 19 is provided with frictional force reducing means 20 for reducing the frictional force with the bead 16. At the time of manufacturing a tire, the bead 16 held by the bead holder 13 by being externally fitted to the tire constituent material wound around the tire forming drum in a state where the bead holder 13 holds the bead 16 is easily removed from the bead holder 16. They are separated from each other and adhered and held to the tire constituent material. [Effect] It is possible to prevent deterioration of tire productivity and quality due to setting of the beads 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bead holder for a tire.

[0002]

[Prior art]

 In the tire manufacturing device, a bead holder is arranged outside the axial center of the tire forming drum.The bead holder holds the beads on the temporary bead receiving ring and holds the body ply on the tire forming drum. Set in the tire material. As shown in FIGS. 6 and 7, the bead holder 31 has a flange portion 32 having a planar shape in the axial direction and a claw portion 33 protruding from the flange portion 32 toward the tire forming drum. The end surface of the flange portion 32 on the tire building drum side is a contact surface 35 that contacts the end surface of the bead 34 on the side opposite to the tire building drum side, and the claw portion 33 is on the opposite side of the bead 34. Inserted into the end of the.

When the bead 34 is set by the bead holder 31 on the tire constituent material wound around the tire building drum, after the bead holder 31 for holding the bead 34 is externally fitted to the tire constituent material. The bead 34 on the bead holder 31 is separated from the bead holder 31 and adhered to the tire constituent material. By the way, in the above-mentioned prior art, the contact surface 35 of the bead holder 31 is not processed at all, and the contact surface 35 is simply a flat surface.

[0004]

[Problems to be solved by the device]

 Therefore, in the above-described conventional art, when the bead holder 31 holds the bead 34, the frictional force between the contact surface 35 of the bead holder 31 and the end surface of the bead 34 is large. Therefore, when the bead 34 is adhered to the tire constituent material during tire production, the bead 34 on the bead holder 31 does not completely separate from the bead holder 31 and returns to the original position together with the bead holder 31. However, there was a problem that the bead holder 31 dropped during the movement to the original position. The fact is that the above problems have reduced the productivity and quality of tires. The present invention aims to provide a bead holder for a tire that can solve the above problems.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a feature of the present invention is that a bead holder for holding a bead is arranged on the outer side in the axial direction of a tire forming drum, and the bead holder is different from the tire forming drum side of the bead. On the tire building drum, with the bead holder holding the bead, the abutting surface that abuts the end face on the opposite side and the claw portion that projects from the corresponding contact surface toward the tire forming drum side and is inserted into the bead. The bead held by the bead holder by being fitted onto the tire constituent material wrapped around the tire is separated from the bead holder and is adhesively held by the tire constituent material. It is equipped with a frictional force reduction means to reduce the frictional force of the. The frictional force reducing means is, for example, a ridge, a groove, a knurl formed on the contact surface, or a coating material applied on the contact surface.

[0006]

[Action]

 When the bead holder holds the bead, its claw portion is inserted into the end portion of the bead, and the contact surface contacts the end surface of the bead. When setting a bead on the tire constituent material wound around the tire building drum, fit the bead holder holding the bead onto the tire constituent material on the tire building drum, and hold the bead holder held on the bead holder. Are separated from the bead holder and adhered to the tire constituent material. At this time, since the abutting surface of the bead holder is provided with a frictional force reducing means for reducing a frictional force with the end surface of the bead, the frictional force between the abutting surface and the end surface of the bead is small. Therefore, the beads on the bead holder can be easily and completely separated from the bead holder and adhered to the tire constituent material.

[0007]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings of FIGS. 1 to 3. FIG. 1 shows a tire manufacturing apparatus, 1 is a tire building drum, and a tire constituent member such as a body ply is provided on an outer surface thereof. It is wrapped around and is rotatably supported around its axis. The tire forming drum 1 includes a center drum 2 located at a central portion in the axial direction, a pair of left and right end cores arranged on both sides of the axial drum in the axial direction, and having winding hoists 3 attached thereto, and an axial direction of an end core. It is composed of a pair of left and right side drums and the like which are arranged on the outer side and hold the hoisting pladder 3. A holding table 5 is arranged on the left side of the center drum 2 and is movably arranged in the left and right directions on the supporting table 6 via a pair of left and right guide rails 7 and is driven by a driving device.

Reference numeral 8 denotes a pair of left and right bead setters for setting beads at predetermined positions on both left and right sides of the tire constituent member on the tire building drum 1. The bead setters are arranged on both sides in the axial direction of the tire building drum 1. There is. The left bead setter 8 is provided on the holding table 5 so as to be movable in the axial direction, and the sliding tube 9 is provided on the holding table 5 side and the left end portion of the sliding tube 9 is fixed to the left end portion of the piston rod. And an air cylinder 10 for sliding the sliding cylinder 9 in the axial direction, and a bead supplied from a bead transfer device to the sliding cylinder 9 so as to be slidable in the axial direction. Holding the bead temporary receiving ring 11, the supporting drum whose left end is fixed to the right end of the sliding tube 9, and the bead on the bead temporary receiving ring 11 which is fixed to the right end of the supporting drum. Tire forming The bead holder 13 for moving the tire constituent material on the drum 1 to a predetermined position is provided. The right bead setter 8 is also configured in a substantially similar manner.

As shown in FIGS. 2 and 3, the bead holder 13 includes a ring-shaped flange portion 15 having a planar shape in the axial direction, and a claw portion protruding from the flange portion 15 toward the tire forming drum 1 side. 17 and a tubular portion 18 projecting from the flange portion 15 to the side opposite to the tire forming drum 1 side. The side surface of the flange portion 15 on the tire forming drum 1 side is a contact surface 19 that contacts the end surface of the bead 16 on the side opposite to the tire forming drum 1 side, and the inner peripheral portion of the contact surface 19 is Friction force reducing means 20 for reducing the frictional force with the end surface of the bead 16 is provided. The frictional force reducing means 20 is, for example, a ridge or groove formed on the contact surface 19 over the entire circumference thereof, or a knurled eye formed on the contact surface 19 by knurling. Further, the claw portion 17 is inserted into the end portion of the bead 16 opposite to the tire forming drum 1 side.

According to the embodiment configured as described above, the tire constituent material such as the body ply is wound around the tire forming drum 1 at the time of manufacturing the tire. On the other hand, in each bead setter 8, the sliding cylinder 9, the bead temporary receiving ring 11 and the bead holder 13 are in the retracted position retracted from the tire forming drum 1, and the bead temporary receiving ring 11 is provided with a bead transfer device. The beads 16 are supplied and the temporary bead receiving ring 11 holds the beads 16. Then, the sliding cylinder 9 slides toward the tire forming drum 1 side by the operation of the air cylinder 10, the bead temporary receiving ring 11 and the bead holder 13 move to the tire forming drum 1 side, and the bead temporary receiving ring 11 moves. After the ring 11 contacts the tire building drum 1 side, the bead holder 13 further moves to the tire building drum 1 side.

As a result, first, each bead holder 13 engages with the bead 16 on the bead temporary receiving ring 11. At this time, the claw portion 17 of the bead holder 13 is inserted into the end portion of the bead 16 opposite to the tire forming drum 1, and the contact surface 19 of the bead holder 13 is located on the opposite side of the bead 16. Abut the end face of. Then, by further moving the bead holders 13 to the tire forming drum 1 side, the bead holders 13 are externally fitted to the tire constituent material on the tire forming drum 1 and held by the bead holders 13. 16 is externally fitted to the tire constituent material on the inner end portion of each end core, and is adhesively held.

In this case, since the contact surface 19 of the bead holder 13 is provided with the friction force reducing means 20 for reducing the frictional force with the end surface of the bead 16, the contact surface 19 and the end surface of the bead 16 are reduced. The frictional force with is small. Therefore, the beads 16 on the bead holder 13 are easily completely separated from the bead holder 13 and are adhesively held on the tire constituent material. Therefore, the bead holder 13 returns to the original position while holding the bead 16, or the bead 16 is moving from the bead holder 13 to the original position with the bead 16 coming off from the bead holder 13, and the bead 16 is moved during the movement. It does not fall out of the bead holder 13 and therefore there is no fear that the setting of the bead 16 will reduce the productivity and quality of the tire.

FIG. 4 shows a second embodiment of the present invention, in which the frictional force reducing means 20 of the contact surface 19 of the bead holder 13 is made of a coating material with a small friction coefficient applied to the contact surface 19. Has been done. As the coating material, for example, a synthetic resin such as polytetrafluoroethylene is used. FIG. 5 shows a comparative example of the present invention, in which the groove 24 is entirely formed on the contact surface 19 of the flange portion 15 of the bead holder 13 on the outer side in the radial direction of 1 to 3 mm from the inner periphery thereof. It is formed over the circumference.

According to the above-described comparative example, when the bead holder 13 holds the bead 16 having a polygonal cross section, for example, a hexagonal cross section, the groove 24 has a lateral protrusion at the end of the bead 16. Therefore, the axial length of the bead 16 held by the claw portion 17 of the bead holder 13 is long, and therefore the bead 16 easily comes off the bead holder 13 during the movement of the bead 16 by the bead holder 13. In addition, the productivity and quality of tires, particularly tire uniformity, due to bead setting will not be deteriorated.

[0015]

[Effect of device]

 As described above in detail, according to the present invention, it is possible to prevent deterioration of tire productivity and quality due to bead setting.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a bead holder showing a first embodiment of the present invention.

FIG. 3 is a sectional view of a bead holder showing a first embodiment of the present invention.

FIG. 4 is a sectional view of a bead holder showing a second embodiment of the present invention.

FIG. 5 is a sectional view of a bead holder showing a comparative example of the present invention.

FIG. 6 is a perspective view of a bead holder showing a conventional example.

FIG. 7 is a sectional view of a bead holder showing a conventional example.

[Explanation of symbols]

1 ... Tire forming drum, 8 ... Bead setter, 10 ... Air cylinder, 11 ... Bead temporary receiving ring, 13, 31 ...
Bead holder, 15, 32 ... Flange portion, 16, 34
... Beads, 17, 33 ... Claws, 19, 35 ... Abutting surfaces, 2
0 ... Means for reducing frictional force.

Claims (2)

[Scope of utility model registration request] 1. A bead holder for holding a bead is arranged outward in the axial direction of a tire forming drum, and the bead holder has an abutting surface for abutting an end face of the bead opposite to the tire forming drum side. A claw portion protruding from the contact surface to the tire forming drum side and inserted into the bead,
With the bead holder holding the bead, the bead held by the bead holder, which is externally fitted to the tire constituent material wound around the tire forming drum, is separated from the bead holder and is adhesively held to the tire constituent material. A bead holder for a tire, wherein the contact surface is provided with a frictional force reducing means for reducing a frictional force with the bead. 2. The bead holder for a tire according to claim 1, wherein the frictional force reducing means is a ridge, a groove, a knurl formed on the contact surface, or a coating material applied on the contact surface.