JPS6359524A - Holding device for tire-constituting band - Google Patents

Abstract

PURPOSE:To eliminate the need of the exchange work of holders even when the band diameter is changed and consequently contrive to enhance the productivity of a tire by a structure wherein a plurality of arcuate holders, which are mounted separately and in the direction to the periphery of an annular frame and which are shiftable radially and synchronously, and to an end of each of which an angularly changeable auxiliary holders are pivotally connected. CONSTITUTION:When a tire-constituting band A is to be held, said tire-constituting band A is mounted in a frame. Next, respective arcuate holders 11 are shifted synchronously and radially inwards so as to push all the arcuate holders 11 and auxiliary holders 28 and 29 against the outer periphery of the tire-constituting band A. As a result, the tire-constituting band A is held from outside by the holders. When the curvature radius of the tire-constituting band A is changed, the auxiliary holders 28 and 29 are pivoted in response to the curvature radius so as to change the angular position with respect to the arcuate holder. Thus, the auxiliary holders 28 and 29 can contact with the outer periphery of a tire-constituting band A having an arbitrary diameter simultaneously with the arcuate holders 11, resulting in increasing the number of contacts and the contact area of the holders to the tire-constituting band A. Consequently, the uniformity of the tire can be improved without utilizing various kinds of holders, and at the same time the air can be prevented from remaining.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gripping device for bands constituting tires, such as belts and tread bands.

BACKGROUND OF THE INVENTION Conventionally, as a gripping device for a tire component band, there is known a device as described in, for example, Japanese Patent Laid-Open No. 58-28363. This device includes an annular frame and a plurality of radially movable arc-shaped holders mounted circumferentially apart from the frame, and the arc-shaped holders are synchronously moved radially inward. By pressing the arc-shaped holder against the outer periphery of the tire component band, the tire component band is gripped from the outside.

- goes up to 0, however,
Since the arc-shaped holder of such a gripping device is made of metal, even if the radius of curvature of the tire component band to be gripped changes, the radius of curvature will not change accordingly. Therefore, if the difference in the radius of curvature between the two becomes large, only a small portion of the arcuate holder will come into contact with the tire component band, which may have a negative effect on tire uniformity or cause the tire component band and other tire structures to There is a problem that air remains between the ply and the ply. In order to solve this problem, conventionally, arc-shaped holders were created every time the radius of curvature differed by 50 m, for example, and when the size of the tire component band changed, the arc-shaped holders were replaced with the closest size. I was dealing with it. As a result, a large number of arc-shaped holders are required, which requires a large amount of manufacturing cost, as well as the cost of maintaining and managing them. Moreover, since a large number of man-hours are required to replace the arc-shaped holder, there are problems in that productivity is reduced and a great burden is placed on the operator.

. This problem is solved by an annular frame, a plurality of radially movable arc holders mounted circumferentially apart from the annular frame, and synchronously moving the arc holders in the radial direction. In a tire component band gripping device that grips the tire component band from the outside by moving the arcuate holder inward and pressing the arcuate holder against the outer periphery of the tire component band, one end of each arcuate holder is provided with an angular position relative to the arcuate holder. This problem can be solved by rotatably connecting a changeable sub-holder.

1. When gripping a tire configuration band, position the tire configuration band within the frame. Next, move each arcuate holder radially inward in synchronization, and move all arcuate and sub-holders to the tire configuration band. Press it against the outer circumference of the band. Thereby, the tire component band is gripped from the outside by these holders. Here, if there is a change in the radius of curvature of the tire constituent band, the sub-holder is rotated in accordance with the radius of curvature of the tire constituent band, and the angular position with respect to the arcuate holder is changed. Thereby, the sub-holder can contact the outer periphery of the tire component band of any diameter at the same time as the arcuate holder, increasing the number of contact points and the contact area with the tire component band. Therefore, it is possible to improve the uniformity of the tire without using many types of holders, and it is also possible to prevent air from remaining.

Actual example Hereinafter, one embodiment of the present invention will be described based on the drawings.

1, 2.3.4, l is an annular frame, and this frame 1 moves in its axial direction along a rail (not shown), for example, a tire forming drum, a belt, a tread band, etc. It can reciprocate between itself and the band forming machine that forms the constituent band A. This frame 1 is provided with a plurality of gripping means 2, six in this embodiment, spaced apart from each other at equal intervals in the circumferential direction. 4
has. Guide grooves 5 are provided on the opposing surfaces of these supports 3.4.
．． A guide block 7.8 formed with a number 6 is mounted in each case. Reference numeral 11 denotes an arc-shaped holder provided between the supports 3 and 4, and the radially inner end surface 10 of each arc-shaped holder 11 is formed in an arc shape with the same radius of curvature as that of the intermediate diameter band of the tire component band A. , even when gripping the tire component band A with the smallest or largest diameter,
The contact area is made to be uniform. Further, these arc-shaped holders 11 have arm portions 12.13 at the center of both ends, and guide grooves 5 are formed on the outer surfaces of these arm portions 12.13.
6 is fitted with a guide bar 14,15 slidably fitted. As a result, the arcuate holder 11 can be moved in the radial direction while being guided by this guide block 7.8. L-shaped brackets 18 are fixed to both ends of the arc-shaped holder 11, and a cam follower 17 is rotatably supported at the tip of each bracket 16.

Reference numeral 18 denotes a cam ring which is coaxial with the frame 1 and rotatably supported thereon. Guide grooves 19 into which the cam followers 17 fit are formed in these cam rings 18, and these guide grooves 18 are connected to the guide bar. 14.
15. A cylinder 20 is connected to the frame 1 via a clevis joint 21, and the tip of a piston rod 22 of this cylinder 20 is connected to the cam ring 18. As a result, cylinder 20
When the piston rod 22 is activated and the piston rod 22 is protruded or retracted, the cam ring 18 rotates by a predetermined angle, so that the cam follower 17 is pushed together with the arc-shaped holder II by the inclined inner surface of the guide groove 18, and the cam follower 17 is pushed against the inclined inner surface of the guide groove 18. Although the arcuate holder 11 attempts to move vertically in the longitudinal direction, since the arcuate holder 11 is restricted by the guide block 7.8 and the guide bar 14.15, the cam follower 17 and the arcuate holder 11 move radially inward or outward. Move in sync. Note that 23 is a reinforcing rib formed on the arc-shaped holder 11. The proximal ends of sub-holders 28 and 29 are rotatably connected to one end and the other end of each arc-shaped holder 11 via pins 26 and 27 parallel to the axis of the frame 1, respectively. 29 inner end surface 30.31
is also formed to have the same radius of curvature as the inner end surface 10 for the same reason as described above. And these sub-holders 2 days, 2
8, when the arcuate holder 11 moves to the radially outer plate, a slight gap K is formed between the tips of the sub-holders 28 of the adjacent gripping means 2; On the other hand, the length is determined so that when the arc-shaped holder 11 moves to the inner eye in the radial direction, the tips of the sub-holder 28 and the sub-holder 29 slightly overlap each other. These sub-holders 28.2 are attached to the outer end surface of each sub-holder 28.23.
Link bodies 32 and 33 that are substantially perpendicular to 9 are fixed, and a cam follower 34.
5 is rotatably supported. 3B and 37 are a pair of guide grooves formed in the support body 3.4 and inclined so as to move away from each other as they approach inward in the radial direction;
The cam followers 34, 35 are slidably fitted into these guides f+t3B, 37. As a result,
When the arc-shaped holder 11 moves radially inward, the cam followers 34 and 35 move away from each other, so that the secondary holder 2
8.29 changes its angular position in the closing direction and corresponds to the reduction in diameter of the tire component band A to be gripped. and,
Arc-shaped holder with sub holder 28.29! Since the angular position with respect to l changes continuously, if the inclination angle of the guide groove 38.37 and the length of the link body 32.33 are set to appropriate values, a secondary The inner end surfaces 30.31 of the holders 28.29 can always be brought into optimal contact. In addition, a protruding piece 41.42 and a square groove 43.4 are provided at the tip of the sub-holder 28.28, respectively.
4 are provided alternately in the axial direction of the frame l.

The protruding pieces 41 of these sub-holders 28 and the sub-holders 2
The axial position with respect to the square groove 44 of 9 is also the same as that of the sub holder 28.
Since the square groove 43 and the protruding piece 42 of the sub-holder 28 are in the same axial position, the protruding piece 41 of the adjacent gripping means 2
and the square grooves 44, and the protruding pieces 42 and the square grooves 43,
When the arcuate holders 11 move radially inward, they fit into each other. As a result, when the arc-shaped holder 11 is located at the radially outer plate, the adjacent sub-holders 28.
The gap K between 29 can be made smaller, and thereby,
The contact area between the sub-holders 28 and 29 and the tire component band A can be increased to improve tire quality.

Next, the operation of one embodiment of the present invention will be explained.

When transporting the tire component band A formed in the band forming machine to the tire forming drum, the frame 1 is moved in the axial direction while the arcuate holder 11 of each gripping means 2 is stopped on the radially outer plate. , the frame 1 is positioned coaxially with and around the tire component band A. Next, the piston rod 22 of the cylinder 20 is protruded and the cam ring 18 is rotated by a predetermined angle. Since the inclined guide groove 19 moves in the circumferential direction due to the rotation of the cam ring 18, the cam follower 17 is pushed and the guide groove 19 is moved in the circumferential direction.
Trying to move vertically to i19, but cam follower 1
The arc-shaped holder 11 connected to 7 is a guide block.
7.8 and guide bar 14.15, all cam followers 17 and all arcuate holders 11 move radially inward in synchronism. At this time, sub holder 2
8.29 is the arc-shaped holder 11 while rotating as described later.
move with Then, as shown in FIGS. 1 and 3, when the inner end surfaces 10 of all the arc-shaped holders 11 and the inner end surfaces 30.31 of all the sub-holders 28.29 are pressed against the outer periphery of the tire constituent band A having a predetermined diameter, The tire component band A is gripped from the outside by a plurality of gripping means 2 spaced apart in the circumferential direction. Here, when the diameter of the tire component band A is small as shown by the imaginary line, the arcuate holder 11 moves further inward in the radial direction as shown in FIG. The guide grooves 3 are inclined so that the followers 34 and 35 move away from each other as they move radially inward.
G, 37 is fitted, so the sub holder 28°29
As it moves radially inward, it rotates to close, and the intersecting angle B with respect to the arcuate holder 11 increases to C, and its angular position changes continuously and automatically. As a result, when the diameter of the tire constituent band A changes, the sub holder 28 automatically follows the change in the radius of curvature of the tire constituent band A, and the arc-shaped holder! The inner end face 0 and the inner end surfaces 30, 31 of the sub-holders 28, 29 of (2) always contact the outer periphery of the tire constituent band A at the same time to securely grip the tire constituent band A at many locations. Note that when the tire component band A to be gripped in this manner has a small diameter, the tips of the sub-holders 28 and 29 of the adjacent gripping means 2 engage with each other, and the sub-holders 28 and 29
Since the rotation is performed by a mechanical link means, the movement is reliable and highly reproducible.When the gripping means 2 grips the tire constituent band A from the outside in this way, the band forming machine is reduced in diameter, and then the frame 1 moves axially to convey the gripped tire component band A to the tire building drum.

In the above embodiment, the sub-holders 28 and 28 were connected to both ends of the arc-shaped holder 11, but in this invention, the sub-holders may be connected only to one end of the arc-shaped holder. The arc shape and the circumferential length of the sub holder are made long so that there is no large gap between adjacent holders. In addition, in the above embodiment, the angular position of the sub holder 28.29 with respect to the arcuate holder 11 is adjusted to the link body 32.33, the cam follower 34.35, the guide groove 3.
6.37, however, in this invention, the sub-holder is connected to the arc-shaped holder via, for example, a ratchet mechanism, and the angular position of the sub-holder is changed every time the diameter of the tire component band is changed. An operator may change it step by step.

[1] As explained above, according to the present invention, there is no need to replace the holder even if the band diameter is changed, so productivity is improved. Further, since there is no need to replace the holder, the work is simple and easy, and it can also be applied to an existing gripping device, resulting in low manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II in FIG.
-I! FIG. 4 is a cross-sectional view taken along the line -m in FIG. 1... Frame 11... Arc-shaped holder 28.
29... Sub-holder A... Tire component band patent applicant Brideston Co., Ltd. Agent Patent attorney Tadashi 1) @ male Figure 2 Figure 4

Claims (1)

[Claims] It comprises an annular frame and a plurality of arcuate holders attached to the frame at a distance in the circumferential direction and movable in the radial direction, and the arcuate holders are moved radially inward in synchronization to move the arcuate holders to the tire constituent band. In a gripping device for a tire component band that grips the tire component band from the outside by pressing it against the outer periphery of the tire component band, a sub-holder whose angular position relative to the arc-shaped holder can be changed is rotatably connected to one end of each arc-shaped holder. A gripping device for a tire component band, characterized in that: