JPS58179633A - Gripping device of unvulcanized tire - Google Patents

Abstract

PURPOSE:To obtain the titled gripping equipment which is of a good accuracy and simple in its mechanism and structure, by opening and closing a plurality of tire gripping elements radially and in a synchronization via a specified linking member by one rotary element capable to rotate normally and reversely. CONSTITUTION:The rotating movement of an element 11 is transformed into the linearly advancing and retreating movement of the element 3 by using a slider 4 engaged to slide freely in the guide groove 2 shaped linearly in a radial direction and a link 19 due to the pin joint structure connecting each slider 4 and the circular periphery of the rotary element 11 individually. By working the pin fitting hole of the connecting ear part 18 of the rotary element 11 for inserting a pin shaft 20 accurately at a uniform pitch and setting each length of the link 19 definitely, in addition by the guiding structure of the slider 4 preventing a jolt, a precision is significantly improved.

Description

[Detailed Description of the Invention] A new and improved tire for gripping a sulfur tire (green tire) and setting it accurately and in alignment on a lower mold when the tire is brought into a warehouse. The present invention relates to providing a gripping device.

As is well known, in a tire vulcanizing machine, unvulcanized tires are brought in and set in an aligned manner on the open lower mold of the vulcanizer, and then the clay mold is closed. The vulcanization is carried out, and a vertical tire loader equipped with a tire gripping paddle, for example, is used as a loading device or a gripping device for such unvulcanized tires.

In such a tire loader, the gripping paddles that directly grip the tire are generally a plurality of gripping paddles for uniformly gripping the outer surface of the donut-shaped ring of the unvulcanized tire, often the inner edge of the bead portion, etc. This is a type of rod-shaped paddle that is arranged at equal positions on the circumference, and is moved back and forth in the radial direction to grip and release the paddles. In order to shave the inner surface shape of the tire and maintain the pressure during vulcanization, a bladder is provided together with a central mechanism for driving the expansion and contraction of the bladder, and the unvulcanized tire is placed on the lower mold. When transporting the vehicle, the bladder is stretched upward into a cylindrical shape so that it does not interfere with tire loading. For this reason, the group of paddles that grip the unvulcanized tire must have a considerable length that protrudes downward from the loader body, otherwise the central mechanism that grips the upper end of the bladder in an upwardly extended position will The upper ring on the side and the loader body will interfere dimensionally.

However, increasing the length of the paddle, which is held in a hanging shape, tends to cause rocking, vibration, etc., resulting in poor gripping accuracy.In addition, the upper mold in the vulcanizer is opened and closed by the lower mold by vertical movement. In a vulcanizer, the upper mold is raised and retracted to open and retract in order to load unvulcanized tires, and the stroke of the top link for raising and lowering increases accordingly, causing the vulcanizer to This will lead to larger size.

In order to accurately grip an unvulcanized tire and transport the tire while maintaining the horizontal height accurately without wobbling or rocking, it is advantageous for the paddle to have a shorter length. In order to shorten the paddle length and prevent it from interfering with the bladder side, recently the loader body, which has a group of paddles that protrudes downward, is opened in the center so that the bladder and upper ring can freely pass through. A paddle is movably incorporated into the donut-shaped loader body under a short length so that the tire can be gripped and released. It is difficult in terms of size and accuracy to arrange a plurality of paddle groups and incorporate the opening/closing mechanism within the limited effective area of the paddle. A cam-based paddle opening/closing device has already been proposed as a solution to these difficulties. In this method, a donut-shaped cam plate is superimposed on the donut-shaped loader body so that it can rotate forward and backward, and a plurality of cam grooves are formed in the cam plate, and the loader body is attached to the loader body in the cam groove. The cam follower of the paddle slider l integrated with the plurality of paddles arranged is slidably engaged, and the cam follower and the cam slider are moved through the rotational displacement of the cam groove by the forward and reverse rotation of the cam plate. This allows the paddles to open and close automatically, but with this cam plate method, the opening and closing accuracy of the paddles is determined by the cutting accuracy of the cam grooves on the cam plate, and the same In order for the cam groove to move smoothly, the cutting process is extremely difficult, and if there is no gap between the cam groove and the cam follower, the cam follower will not be able to rotate smoothly, and problems such as seizing will eventually occur. A certain amount of clearance is essential between the two engagement sliding surfaces, and this clearance inevitably impairs accuracy.

The present invention solves the above-mentioned problems in the prior art, particularly in the tire gripping device in the conventional tire loader due to the donut-shaped loader body and short paddle group, and has an extremely precise and mechanical structure. This invention relates to the provision of a tire gripping device which is particularly advantageous in terms of performance, and its characteristics are based on a plurality of tire gripping devices arranged at equal positions on the circumference in order to uniformly grip the annular portion of an unvulcanized tire. a gripping element group A6, a rotating element that is provided to be able to freely rotate forward and backward about the circumferential center, and a linear forward and backward movement that moves the rotational movement of the rotating element in the circumferential radial direction of each gripping element. a connecting member that connects the rotating element and each gripping element individually and linearly; a guide structure that holds each gripping element individually and extends in the radial direction; and a guide structure for forward and reverse rotation of the rotating element. and a driving means.

Hereinafter, the present invention will be described in detail based on the illustrated embodiments. The examples illustrated in FIGS. The figure is a plan view of the entire device viewed from the lower mold side (from below), and Figures 2 and 3 are detailed views of the main parts.
Although the central part is not shown in the figure, in the vicinity of the lower surface of the donut-shaped loader main body (1), which has a hole through which a bladder including an upper ring disposed at the center of the lower mold in a known tire vulcanizer can freely pass. Linear guide grooves (2) extending in the radial direction are located at equal positions on the circumference (in the example shown, eight equal parts are shown) around the center O of the main body (1). ) is recessed, and each guide groove (
A slider (4) having a U-shaped cross section attached to or integrally formed with the upper end of the tire gripping element (3) is slidably engaged with the tire gripping element (3). Therefore, in the illustrated example, eight tire gripping elements (3) are arranged on the same circumference.

In the illustrated example, these gripping elements (3) are short elements with locking claws (3a) formed at their lower ends that removably engage with the inner edge of the upper bead when the unvulcanized tire is placed horizontally. A pair of parallel walls (4) of a slider (4) with a U-shaped cross section are attached to the upper end of the element (3).
a) One of (4a) is fixed, and the other is slidably fitted into the guide groove (2), and the wall (4b) connecting the walls (4a) (4a) has As shown in Figure 2.6, the guide recess @ (21) has an abbreviated guide piece (5) erected along one longitudinal side of the wall (4).
b), and the flange (5a) formed to protrude inward from the lower end of the guide piece (5) is engaged with the lower wall (4a) of the slider (4). .

When installing the guide piece (5), as shown in Figure 2.3, a mounting bolt (7) screwed into the loader body (1) side through the screw hole (6), and a mounting bolt (7) screwed into the guide piece (5) side. This is done through the provided bolt loose insertion hole (8), and at this time, the sliding state in the vertical direction can be adjusted freely by the guide piece (+5) and the adjustment shim (9) inserted on the +1+ side of the loader body, and the bolt looseness can be adjusted. The sliding state in the left and right direction can be adjusted freely through the lateral movement of the guide piece (5) through the insertion hole (8), so that the relationship with the slider (4) can be adjusted without play. Ensure a smooth sliding relationship. In addition, an annular rotating element (11) is rotatably fitted and supported on the inner periphery (]a) of the central opening of the loader body (1) via a bushing (10), and the element (+1) A stop plate (12) provided on the bushing (10) is engaged with and held at the upper end of the bushing (10). As shown in the first figure, on a part of the outer periphery of this rotating element (11), there is a piston rod 15) of a driving cylinder θ4) whose one end is pivoted at another position of the loader body (1) with a pivot θ3). By being pivotally connected to the mounting ear (16) provided on the element (11) side via a pivot (1η), it can freely rotate forward and backward through the forward and backward movement of the piston rod θm. On the outer periphery of the element (11), a number of connecting ears 08) corresponding to the number of the tire gripping elements (3) are provided in protruding shapes 19 at equal positions on the circumference, and each of these ears 08) Tire gripping element (3
) are connected by links θ9) as connecting members. For this connection, as shown in Fig. 3, a bottle shaft (20) provided on the connecting ear (18) and a bottle shaft 1 provided on the slider (4) are used.
), a bin joint structure is used in which both ends of the link θ9) are rotatably supported via bushes e2Z (23). In addition, in carrying out the implementation,
l, Bush (2Z) (23) may be replaced with a bearing.

According to the embodiment of the present invention shown in FIGS. 1 to 3,
In the group of tire gripping elements (3) shown by solid lines in FIG. 1, each slider (4) follows each guide groove (2) formed linearly in the radial direction.
Although not shown, the slider (41) moves forward toward the inner periphery of the unvulcanized tire by simultaneously gripping the inner edge of the bead portion of the unvulcanized tire. This is obtained by the rotation of the rotating element (11) in the counterclockwise direction in the drawing due to the retraction of the piston rod (15) in the cylinder (14), and the accompanying rotational displacement of the link θ9). In this way, the unvulcanized tire gripped by the inner line of the bead portion by each group of gripping elements (3) is attached to the loader body (
By moving the loader body (1) onto the lower mold of the vulcanizer by various conventionally known mechanical means, and then vertically lowering the loader body (1), it is easy to set the load in the correct alignment on the lower mold. You can get it.

At this time, each of the sliders (4) of each gripping element (3) has a linear guide concave groove 02) and a guide piece (5) as shown in the third figure.
As a result, each surface of the link θ9) other than the connecting entry side is securely held and supported without any play in the vertical or horizontal directions, so that vibration or rocking in the circumferential direction is not likely to occur. This makes it possible to easily charge and set unvulcanized tires in a consistent manner while maintaining a stable and uniform horizontal height. After setting the tire on the lower mold, release the grip on the inner edge of the bead and remove the loader body (1).
To return to the previous position, operate the driving cylinder (14) from the position shown by the solid line in Figure 1, push its piston rond (+5), and move from the solid line position to the position shown by the chain line. By setting it to the Rondo (15a) state, the rotating element (
Since 11) rotates in the opposite direction (11), each link 09) moves from the solid line position to the chain line link (19a) along with the rotational displacement of each connecting ear (18). The slider (4) moves to its guide groove (2) through the binge joint structure.
), each gripping element (
3) is also retreated to the same position and retracted from the inside line of the bead portion, so that the vertical rise of the descending loader body (1) allows it to move away from the unvulcanized tire and return to its original position.

The most important feature of the device of the present invention is that it has a donut shape with an opening in its center, thus allowing the use of a tire gripping element (3) of short length without interfering with the plug and the upper ring. The point is that the opening/closing mechanism of the gripping element (3) can be incorporated with high precision into the loader main body ftl which stays within a narrow effective area. That is, when opening and closing a plurality of tire gripping element (3) groups in radial synchronization using one rotary element (11) that can freely rotate in forward and reverse directions,
A slider (4) slidably engaged in a guide groove (2) formed linearly in the radial direction, and each slider (4).
The elements (11
) is converted into a linear forward and backward movement of the element (3), unlike the conventional cam system in which a cam follower rolls in a curved cam slot, play between the members is essential. That slider (4) without the need to use a structure that
It is only necessary to slide in a linear groove in a line drawing, and it is moved smoothly with a tight joint relationship, and there is no rattling or swinging in the vertical or horizontal direction. Furthermore, there is no reduction in accuracy due to the generation of play. Moreover, the link (!9) that rotates as a connecting member has both ends attached to the element (++) side and the slider (4) side.
l t2] 1 'G bush (221 (2,'ll), since it is connected with a pin joint structure, the pin attachment hole of the connecting ear (18) for attaching the pin shaft (20) in the rotating element (11) must be accurately Processed under uniform pitch, link α
By making the respective lengths of 9) the same, the accuracy is significantly increased by 11, in conjunction with the guide structure for preventing backlash in the slider (4). , 13 improved, it is easy to hold the unvulcanized tire at the correct horizontal height, and to stably and accurately align it to a predetermined position on the lower mold without lateral wobbling or rocking, and thereby Vulcanization precision will also be improved. In this case, it would be even better if a bearing structure was used instead of the bush (221 (23+) at the binge joint part of the link 09).

Moreover, the necessary parts and structure of this entire device are extremely simple, and it can be manufactured inexpensively and compactly, and can be installed in the donut-shaped loader body (1) with sufficient room. .

Next, as an embodiment of the present invention, the basic principle is the same as that of the embodiment shown in Figs. A device that allows this will be explained with reference to FIGS. 4 to 6.

Support bracket) kl+ corresponds to the loader body (1) shown in the embodiment in Fig. 1, and is a donut-shaped plate body with an opening (ala) at its center 0 through which the plug and the upper ring can pass. Although not shown in the drawings, this bracket is used by being attached to the main body of a conventional vertical loader or other loader device by appropriate means. The inner periphery of the bracket (3I) is provided with guide elongated holes (30) extending linearly in the radial direction at equal positions on the circumference, as in the embodiment shown in FIG. 31a) has an opening (
According to 31a), the support bell z that goes around in an annular cylindrical shape is attached (83) integrally with a spring washer, etc.,
There are bushes (3
A ring-shaped rotating element (36) is rotatably held via a ring-shaped rotating element (36), and the guide elongated hole (30) is formed on the outer periphery of the rotating element (36).
The same number of connecting ears (aaa) are protruded at equal positions on the circumference, and one end of the link throat as a connecting member is connected to the ears (36a) via the pin shaft 0η and the bushing (c). They are rotatably and pivotally connected.

In addition, a short tire gripping element (40) equipped with locking claws (4OA), etc. that grip the inner edge of the bead portion of an unvulcanized tire, for example, has a slider (40) integrally fixed or formed on the top thereof. The slider (45) is provided with a recess 15 corresponding to the inner periphery of the support (321 and the bracket). The guide shaft (41) is fitted into a linear guide bar fixedly installed in the block (4 (1)) so as to be slidable in a straight line via a bush (46), and the guide shaft (41) is vertically installed on the upper part of the block (4 (1)). A bearing (47) provided at the upper end of the tire gripping element (40) is slidably engaged with the guide elongated hole, thereby preventing the tire gripping element (40) from steadying in the rotational direction of the guide bar (39). In the middle of the guide shaft ← 1), there is a link whose one end is pivotally connected to the connecting ear (aaa) of the rotary element through the pin shaft 0'71 bush 8). (43) The other end is a bush (42)
α9) indicates the mounting bolt for the bracket (481). In addition, in order to rotate the rotating element (3G) in the forward and reverse directions on m21, a bracket is provided on the inner periphery of the upper part of the element (3G), as shown in Figures 4 and 6. (521 is provided in a protruding shape, and the same bracket is attached)
A drive platen (53) connected to a drive cylinder (50) is connected to a piston rod (5O
a) through the clevis f51+, the piston rod (50a) moves forward and backward (platen).
(The rotary element (36) is rotated forward and backward through forward and reverse rotation along the arcuate elongated hole (54) of 521.

According to this embodiment, the rotating element 6) rotates forward and backward on the support 02) through the movement of the piston rod (5Oa) by the actuation of the driving cylinder (50), and thus each connecting ear ( aaa) and the guide shaft (41) via a pin joint structure.
Through the rotational displacement of the slider (44), the guide bar (3
9) By moving forward and backward in the radial direction, the inner edge of the bead portion of the unvulcanized tire is gripped and released in exactly the same manner as in the embodiment shown in FIG. According to this embodiment, compared to the holding and guiding structure of the tire gripping element (3) using the guide groove (2) and slider (4) type in the embodiment of FIG. Slitter responsibility for 4
41 bodywork, and a bearing C7 for the guide slot (3o) of the guide shaft (41) connected to the link (43).
), a more solid and stable guide structure for the tire gripping element (40) than the rigid high floor 117 can be obtained, and if the guide bar (39) is a bar with a circular cross section, backlash can be reduced. Even in this case, the length of the link (43) is made uniform, the length of the guide slot and both ends of the guide bar (89) are reduced. High accuracy is achieved by accurately indexing the support holes of the guide bar C39+, and bending of the bar is also prevented by supporting both ends of the guide bar C39+. Compared to the embodiment shown in FIG. As with the embodiment shown in FIG. 1, this has an advantage over the conventional cam plate system.

In each of the embodiments described above, the forward and reverse rotation of the rotating elements (11) and (86) is of course not limited to the cylinder mechanism shown in the figures, and it goes without saying that a reversible motor or other device may be freely used.

The gripping device of the present invention solves the problems of the conventional tire gripping method and has great advantages as a high-precision tire gripping mechanism.Moreover, the gripping device of the present invention has a great advantage of being a highly accurate tire gripping mechanism. h18 This is excellent as it can be simplified.

[Brief explanation of drawings]

FIG. 1 is an overall plan view of an embodiment of the device of the present invention as seen from the bottom;
Fig. 2 is an enlarged plan view of part A in Fig. 1, Fig. 3 is a side sectional view of the lower part of the movement mechanism, Fig. 4 is a plan view of the main part of a modified embodiment of the device, and Fig. 5 is the same side. The sectional view and FIG. 6 are side views of the main parts of the drive cylinder. (+l...Loader body, (2)...Guide groove, f
41M...Slider, (3) (40:...Tire gripping element, (IIIC361...Rotating element, θ8) 0
(6)... Link, (dl+... Support bracket, (30)... Guide long hole, 09)... Guide bar, ←l)... Guide shaft, 04) (50)...・Drive cylinder. -198- ″ 0 \r

Claims (1)

[Claims] ■ A tire gripping device for aligning the unvulcanized tire on the lower mold of a tire vulcanizer, and gripping the unvulcanized tire at equal positions on the circumference in order to evenly grip the annular part of the unvulcanized tire. a plurality of gripping element groups arranged in a plurality of gripping element groups; a rotating element provided to be rotatable in forward and reverse directions about the circumferential center; and moving the rotational movement of the rotating element in the circumferential radial direction of each gripping element. a connecting member that connects the rotating element and each gripping element individually and linearly, a guide structure that holds each gripping element individually and extends in a radial direction, and a guide structure that holds each gripping element individually and extends in a radial direction; A gripping device for an unvulcanized tire, comprising: a drive means for forward and reverse rotation;