JP3937703B2 - Bead forming drum unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bead molding drum device.
[0002]
[Prior art]
The process of assembling a green tire includes a process in which a bead molding drum device is used to join the bead apex rubber and the bead core.
In this step, the bead core is supplied in the form of a ring. On the other hand, the bead apex rubber is supplied in a state of presenting a band-shaped body having a predetermined width.
Therefore, in this process, the bead apex rubber is first formed into a cylindrical shape having the same diameter as that of the bead core, and the other side is expanded while keeping the inner diameter on one side, so that the whole is formed into a donut plate shape. Then, the bead core is joined to the inner peripheral edge.
[0003]
This bead molding drum device has a drum for sticking a bead apex rubber in a cylindrical shape, and this drum is provided with a plurality of drum segments arranged in the circumferential direction, and all these drum segments are Further, it is possible to swing upright all around the swinging fulcrum provided on the drum front end side (near the bead core holding position).
[0004]
[Problems to be solved by the invention]
The bead core has various ring diameters depending on the size (diameter) of the green tire to be assembled.
Therefore, as a matter of course, it is necessary to prepare various drums for forming the bead apex rubber into a cylindrical shape in accordance with each size. Therefore, when the production lot is changed, it is necessary to replace the drum itself.
[0005]
Since such a drum is heavy, the replacement work is troublesome and time-consuming, and these have a considerable adverse effect on the entire tire manufacturing. In addition, the initial (production cost, etc.) and running (maintenance cost, etc.) costs of the drum have increased the tire production cost.
The present invention has been made in view of the above circumstances, and is intended for facilitating and speeding up operations relating to tire size production lot change, etc., and reducing the costs associated with tire manufacture. An object is to provide an apparatus.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has taken the following measures.
That is, the drum device for bead forming according to the present invention includes a drum formed by arranging a plurality of drum segments side by side in a circumferential arrangement, and a swinging motion in which all the drum segments in the drum are provided on the drum front side. It has a segment opening and closing mechanism that swings up and down all around the fulcrum.
This bead molding drum device operates the segment opening / closing mechanism in a state where the bead apex rubber supplied in the form of a belt is attached to the outer peripheral surface of the drum, thereby opening the bead apex rubber into a donut plate shape, The inner peripheral edge portion is joined to the outer peripheral side of the bead core held in the ring shape at the adjacent position.
[0007]
In the segment opening / closing mechanism, the position of each drum segment in the radial direction before and after swinging can be adjusted.
With such a configuration, the outer diameter of the drum outer peripheral surface formed by the outer peripheral surfaces of all the drum segments can be substantially enlarged or reduced as desired. When changing, it is possible to deal with it without having to change the drum.
Accordingly, it is possible to facilitate and speed up the work for changing the production lot of the tire size and the like, and to reduce the cost for manufacturing the tire.
[0008]
In the segment opening / closing mechanism, the drum position can be adjusted in the radial direction by moving the swing fulcrum of each drum segment in the radial direction by the radial advance / retreat driving unit.
In this way, ease of operation can be obtained.
A fluid pressure cylinder can be used for the radial advance / retreat drive.
In this case, the outer diameter of the outer peripheral surface of the drum at the time of the degeneracy limit of the fluid pressure cylinder is set to be equal to or less than the outer diameter of the target minimum bead core, and the return from the state where the fluid pressure cylinder is extended ( The stopper spacer to be regulated or restrained is taken out, placed in the opposite direction, or replaced with one of a different length.
[0009]
By doing so, the radial position adjustment in the drum segment can be performed easily and accurately.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows the entirety of an embodiment of a bead molding drum device 1 according to the present invention.
This bead molding drum device 1 has a drum 2 and a segment opening / closing mechanism 3, and holds a bead core (see reference numeral 5 in FIG. 1) on the left side of FIG. The bead rings 6 are arranged so as to be adjacent to each other.
[0011]
The drum 2 has a short cylindrical shape with its central axis P oriented horizontally, and a plurality of drum segments 8 are provided side by side along the circumferential direction of the drum 2 as shown in FIG. It has become. A drum outer peripheral surface 2 a parallel to the drum center axis P can be formed on the outer surface of the drum segment 8 arranged in the circumferential direction in this way.
Therefore, a bead apex rubber (refer to reference numeral 10 in FIG. 1) supplied in a band shape is attached to the drum outer peripheral surface 2a of the drum 2 (all drum segments 8) to form a cylindrical shape. It can be made to.
[0012]
The segment opening / closing mechanism 3 includes a link drive unit 11 that enables the entire drum segment 8 to swing, and a radial advance / retreat drive unit 12 that moves all the drum segments 8 in the radial direction as shown in FIG. Yes.
The link driving unit 11 holds each drum segment 8 so as to be swingable around a swinging fulcrum 14 provided on the drum front end side, that is, near the holding position of the bead core 5 (bead ring 6). 8, a pushing / pulling force is applied all at once by a driving tool 17 such as a fluid pressure cylinder through a lever 15 and a driving ring 16 connected thereto.
[0013]
As shown in FIG. 4, the link driving unit 11 is provided with a movable stroke adjusting mechanism 20. The movable stroke adjusting mechanism 20 includes a forward limit adjusting unit 21 and a backward limit adjusting unit 22.
4A shows the operating state of the backward limit adjusting unit 22, and FIG. 4B shows the operating state of the forward limit adjusting unit 21.
The forward limit adjusting unit 21 is provided with a forward stopper 24 attached in a forward projecting state with respect to a support body 23 projecting in a radial direction from the drive ring 16, and before the drive ring 16 can come into contact with the forward stopper 24. Part brake body 25. The front brake body 25 is fixed to the foundation 27 side via a bracket 26.
[0014]
The retreat limit adjustment unit 22 has a retreat stopper 30 attached in a rear projecting state with respect to the support 23 and a rear brake body 31 that can come into contact with the retreat stopper 30 when the drive ring 16 retreats. ing. The rear brake body 31 is fixed to a housing 32 or the like that holds the driving tool 17.
Accordingly, the advancing range of the drive ring 16 is stopped by the contact between the forward stopper 24 and the front brake body 25 at the forward limit adjusting unit 21, and the reverse stopper 30 and the rear brake body at the reverse limit adjusting unit 22 are stopped. The retreat range of the drive ring 16 is stopped by the contact with 31.
[0015]
The swing range of the drum segment 8 is indirectly restricted by the forward / backward stroke of the drive ring 16 thus restricted.
That is, in the forward limit adjusting portion 21, if the forward protrusion degree of the forward stopper 24 and the backward protrusion degree of the front brake body 25 are adjusted, the stroke limit when the drive ring 16 moves forward can be adjusted in the front-rear direction. When the drag segment 8 stands up (the state indicated by the two-dot chain line in FIG. 1), the verticality (rather, the lower end position level of the bead apex rubber 10 in the standing state) can be adjusted.
[0016]
FIG. 7 is an example in which the rearward protrusion degree of the front brake body 25 is adjusted by fitting a stopper spacer 33 having a collar shape.
On the other hand, in the backward limit adjusting portion 22, if the rearward protrusion degree of the backward stopper 30 and the forward protrusion degree of the rear brake body 31 are adjusted, the stroke limit when the drive ring 16 is retracted can be adjusted in the front-rear direction. As a result, it is possible to adjust the level when the drum segment 8 is lying down (indicated by the solid line in FIG. 1).
[0017]
FIG. 6 shows an example in which the degree of forward protrusion of the rear brake body 31 is adjusted by fitting it onto a stopper spacer 34 having a collar shape.
On the other hand, as shown in FIG. 1, the radial advance / retreat drive unit 12 includes a segment base 36 configured to support the drum segment 8 by the swing fulcrum 14 and the diameter of the drum central axis P together with the swing fulcrum 14. The position can be adjusted in the direction.
The segment table 36 is movable up and down via a slide guide 40 having a guide rail 38 and a slider 39 with respect to a lift support table 37 provided in a protruding state in the radial direction when viewed from the drum central axis P. Is held in.
[0018]
A fluid pressure cylinder 42 is attached to the lift support base 37 along the sliding direction of the segment base 36, and a rod end 43 of the fluid pressure cylinder 42 is connected to the segment base 37 via a rod connector 44. Connected.
Therefore, the radial positioning of the drum segment 8 together with the swing fulcrum 14 can be changed by extending and contracting the fluid pressure cylinder 42.
In such a radial advance / retreat drive unit 12, a degeneration limit adjustment unit 47 is provided. The degeneration limit adjusting unit 47 projects from the segment table 36 to the front side (left side in FIG. 1) of the lifting support table 37 in such a manner as to straddle the guide rail 38 of the sliding guide 40 or to pass the side. A stopper piece 50 provided via a bracket 49 and a brake body 51 that can come into contact with the stopper piece 50 when the segment base 36 moves in the radial direction toward the drum central axis P. The brake body 51 is fixed to the lifting support base 37.
[0019]
Further, the stopper piece 50 is provided with a guide shaft 52 parallel to the guide rail 38, and the guide shaft 52 is slidable without rattling while passing through the brake body 51.
Therefore, the degenerative limit position of the fluid pressure cylinder 42 is governed by the direct contact between the stopper piece 50 and the brake body 51.
Accordingly, the radial positioning of the drum segment 8 at this time, that is, the outer diameter of the drum outer peripheral surface 2a is equal to or smaller than the outer diameter of the bead core 5 having the smallest diameter in the bead molding drum device 1 (that is, The diameter should be the same or smaller.
[0020]
Thus, by operating the fluid pressure cylinder 42 in the extending direction, the radial positioning of the drum segment 8 can be changed so as to correspond to the large-diameter bead core 5 as well.
And, in this contraction limit adjustment part 47, if the downward protrusion degree of the stopper piece 50 and the upward protrusion degree of the brake body 51 are adjusted, this limits the distance for returning the fluid pressure cylinder 42 from the extended state to the retracted direction, The stop position of the drum segment 8, that is, the radial positioning can be adjusted up and down.
[0021]
As a concrete plan for this, in this embodiment, as shown in FIG. 5, a stopper having a predetermined length is used as a form to be inserted into the guide shaft 52 of the stopper piece 50 between the upper and lower sides of the stopper piece 50 and the brake body 51. The spacer 55 is taken out, put in, or exchanged for a different length.
Needless to say, as the stopper spacer 55, those having different lengths are prepared in advance according to the size of the bead core 5.
In the bead forming drum device 1 having such a configuration, first, the fluid pressure cylinder 42 is extended to the maximum by the reduction limit adjusting unit 47 of the radial advance / retreat drive unit 12.
[0022]
Then, depending on the diameter size of the bead core 5 held by the bead ring 6, a stopper spacer 55 having a predetermined length is inserted between the upper and lower portions of the stopper piece 50 and the brake body 51, or nothing is inserted.
Then, the fluid pressure cylinder 42 is brought into a degenerated state.
Thereby, the radial position of the drum segment 8 is adjusted to an appropriate value (corresponding to the bead core 5).
At this time, if the positioning of the drum segment 8 in the radial direction is changed, the drum segment 8 is pulled to the drive tool 17 side because the drive tool 17 is connected to the drum segment 8 via the lever 15 and the drive ring 16. The drum outer peripheral surface 2a, which is supposed to be in a horizontal posture, becomes a rearward tilted posture or, depending on the case, is pushed forward from the driving tool 17 in some cases.
[0023]
Therefore, in accordance with these states, in the movable stroke adjusting mechanism 20 of the link driving unit 11, the backward stroke limit of the drive ring 16 is adjusted back and forth by the backward limit adjusting unit 22. This adjusts the level of the drum segment 8 (see FIG. 6).
On the other hand, when the driving tool 17 is operated after such adjustment and the drum segment 8 is erected, the drum segment 8 is pulled toward the driving tool 17 due to the change in the radial position of the drum segment 8. It must be in the form of a vertical posture (the lower end position of the bead apex rubber 10 in a standing state must be in contact with the bead core 5), or it may be driven in some cases. It becomes excessive in the form pushed out from the tool 17.
[0024]
Therefore, in accordance with these states, in the movable stroke adjustment mechanism 20 of the link drive unit 11, the forward stroke limit of the drive ring 16 is adjusted back and forth by the forward limit adjustment unit 21. This adjusts the perpendicularity of the drum segment 8 (a state in which the lower end position of the bead apex rubber 10 in the standing state is in contact with the bead core 5) (see FIG. 7).
In this way, when the bead forming drum device 1 is operated, the bead apex rubber 10 affixed in a cylindrical shape to the drum outer peripheral surface 2 a of the drum 2 is stood up together with the standing and swinging of all the drum segments 8. The continuous operation of raising and joining one end side of the lower end side to the outer peripheral side of the bead core 5 can be reliably obtained.
[0025]
Then, when the production lot is changed such that the diameter size of the bead core 5 is changed, it is possible to easily and quickly cope with the above procedure without needing to replace the drum 2.
Therefore, it is possible to facilitate and speed up the work relating to the production lot change of the tire size and to reduce the cost related to the tire production.
By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.
[0026]
For example, in the degeneracy limit adjustment unit 47 of the radial advance / retreat drive unit 12, the fluid pressure cylinder 42 can be replaced with a drive mechanism using a motor or the like as a drive source. In this case, since the rotation of the motor can be controlled, the use of the stopper spacer 55 as described above can be eliminated by performing this control.
Also in the movable stroke adjusting mechanism 20 of the link driving unit 11, the driving tool 17 can be replaced with a driving mechanism using a motor or the like as a driving source. Therefore, the forward limit adjusting unit 21 and the backward limit adjusting unit 22 can be used. The use of the stopper spacers 33 and 34 can be eliminated.
[0027]
【The invention's effect】
As can be seen from the above description, the drum forming drum device according to the present invention is configured such that a plurality of drum segments constituting a drum for sticking a bead apex rubber to a cylindrical shape are advanced and retracted in the radial direction. Since the position can be adjusted in the radial direction by the drive unit, it is not necessary to replace the drum when changing the production lot of the tire size. Therefore, it is possible to facilitate and speed up the work for changing the production lot of the tire size and to reduce the cost for manufacturing the tire.
[Brief description of the drawings]
FIG. 1 is an enlarged side view showing a part (radial direction advance / retreat drive unit) of FIG. 3;
FIG. 2 is an overall side view showing an embodiment of a bead forming drum device according to the present invention.
FIG. 3 is a side view showing a part (segment opening / closing mechanism) of FIG. 2 extracted and enlarged.
4 is an operation explanatory diagram based on a view taken along the line AA in FIG. 2; FIG.
FIG. 5 is a side view showing the operation state from FIG. 1;
6 is a state diagram in which position adjustment is performed in correspondence with (A) in FIG. 4;
FIG. 7 is a state diagram in which position adjustment is performed in correspondence with (B) in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bead forming drum apparatus 2 Drum 2a Drum outer peripheral surface 3 Segment opening / closing mechanism 5 Bead core 8 Drum segment 10 Bead apex rubber 12 Radial direction advancing / retreating drive part 14 Oscillating fulcrum 42 Fluid pressure cylinder 55 Stopper spacer

Claims (3)

A drum (2) formed by arranging a plurality of drum segments (8) side by side in a circumferential arrangement, and an oscillating fulcrum at which all drum segments (8) in the drum (2) are provided on the drum front end side (14) a segment opening / closing mechanism (3) that swings up and down all at once, and this segment opening / closing mechanism (3) is a drive ring (16) that is movable forward and backward in the direction of the central axis (P) of the drum (2). ), And a lever (15) for connecting the drive ring (16) and each drum segment (8), and the bead apex rubber (10) supplied in a strip shape is used as the drum outer peripheral surface (2a). drive ring in a state of adhered to (16) is moved forward to be to push the respective drum segments (8) by a lever (15), in unison all drum segments (8) swing fulcrum (14) around By TatsuYurado, bead molded to bond to the outer peripheral side of the bead apex rubber (10) and held in a ring form in which the adjacent position the inner peripheral edge portion and at the same time to open a donut-shaped bead core (5) In the drum device for
In the segment opening / closing mechanism (3), the radial positioning before and after swinging of all the drum segments (8) can be adjusted, and the stroke limit when the drive ring (16) is retracted is adjusted. A drum apparatus for bead forming, characterized in that is adjustable .   In the segment opening / closing mechanism (3), the radial position adjustment of the drum segment (8) is a structure in which the swing fulcrum (14) of each drum segment (8) is moved in the radial direction by the radial advance / retreat drive unit (12). The bead forming drum device according to claim 1, wherein the bead forming drum device is provided.   A fluid pressure cylinder (42) is used as a drive source of the radial advance / retreat drive unit (12), and the outer diameter of the outer peripheral surface of the drum (2a) at the time of the contraction limit of the fluid pressure cylinder (42) is targeted. The outer diameter of the minimum bead core (5) is adjusted to be equal to or smaller than that of the minimum bead core (5), and a stopper spacer (55) that disturbs the return from the extended state of the fluid pressure cylinder (42) is put in and out or is replaced with a different length. 3. A bead-forming drum device according to claim 2, characterized in that adjustment of the radial positioning of the drum segment (8) is possible.

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