JP3207604B2 - Bead core forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of automatically clamping the bead wire winding start portion of a bead core formed by winding a bead wire on a former in conjunction with the expansion and contraction of the former, thereby increasing the efficiency of forming the bead core. The present invention relates to a bead core forming apparatus that can be improved.

[0002]

2. Description of the Related Art In a pneumatic tire T, for example, as shown in FIG. 9, an annular bead core C which holds a folded portion of a carcass b at a bead portion a mounted on a rim and maintains tire rigidity. The bead core C is usually formed by spirally winding a rubberized steel bead wire W on a former f, as shown in FIG.

[0003] Such a former f is conventionally known as shown in FIG.
As shown in FIG. 5, a pair of disk-shaped formers f1 and f2 are divided into right and left along a groove m for winding a bead wire, and the formers f1 and f2 are arranged concentrically with an interval g. The bead core C is pivotally supported using the support shafts h1 and h2, and the bead core C completed by making one of the formers f2 slidable along the axis is separated by the gap g.
It was possible to remove from.

Further, as shown in FIG. 12, the winding start portion W1 of the bead wire W for winding is formed by the former f1,
A recess h is provided along the bottom edge of the groove between f2 and the former f.
At the time of setting 1, f2, the winding start portion W1 was fixed in the recess h by sandwiching the winding start portion W1.

[0005]

However, such a conventional fixing requires a high precision in supplying the bead wire W to the recess h, resulting in an increase in apparatus cost and a decrease in supply efficiency. In addition, it is necessary to hold the winding start portion W1 until the setting of the formers f1 and f2 is completed. ,
Since f2 is heavy, it is extremely dangerous and impairs work safety.

The present invention is based on the fact that a winding former is formed so as to be able to expand and contract in diameter, and a contact piece and a lever are provided at a discontinuous portion where the outer peripheral surface is cut off. The present invention relates to a bead core forming apparatus that can clamp the winding start portion to solve the above-mentioned problem.

[0007]

According to the present invention, there is provided a winding former having a concave groove formed on the outer peripheral surface thereof, and a winding former comprising the same.
A support shaft that is arranged and rotatable while supported by the frame
The comprising, a bead core forming apparatus for forming a tire bead core by the bead wire is wound around the groove of the winding former, the winding former, sector is divided about the axis of the support shaft body moreover a plurality of divided segments provided with the groove on the outer circumferential surface, the split segment the outer peripheral surface is arranged in the shaft member so as to be scaled size by simultaneously sliding radially the axis perpendicular to a plane In addition, at least one of the divided segments has an outer peripheral surface that is half of a bottom surface of the concave groove.
By being cut off with a depth exceeding the radial inward
The outer peripheral surface is provided with a break, and the break is provided.
The edge of the bead wire winding start portion is aligned with the axis.
Positioned radially inward of the bottom surface of the groove on a plane perpendicular to the groove
Along with being insertable, the break portion, a piece located on one groove wall side sandwiching the concave groove and extending radially inward from the bottom surface, and pivotally supported in the break portion; and lever tip having a gripper for clamping the winding start portion between said moving tip the one groove wall side along with the position and moreover expanded to other groove wall those pieces with reduced diameter state This is a bead core forming apparatus provided with:

[0008]

The winding former is composed of a plurality of divided segments divided around the axis, and the outer peripheral surface of the winding former can be enlarged and reduced in diameter. Therefore, the bead core formed on the outer peripheral surface in the expanded state can be easily removed from the former in the reduced diameter state. Also, by changing the diameter of the outer peripheral surface of the former by the expansion and contraction diameter, it becomes possible to form various bead cores having different inner diameters using one former.

The gripping portion of the lever pivotally supported in the discontinuous portion of the outer peripheral surface has its distal end located on the other groove wall side in the reduced diameter state, and moves to one groove wall side as the diameter increases. Therefore, the winding start portion inserted into the interrupted portion in the reduced diameter state is captured by the grip portion and moves together with one of the groove walls during the movement of the grip portion.
At the end of the movement, and is clamped between the gripper and the piece. That is, without being affected by the insertion position of the winding start portion, the winding start portion is captured and clamped in conjunction with the radial movement of the former. Therefore, high precision is not required for insertion of the winding start portion, that is, supply, and it is possible to reduce the apparatus cost, simplify the structure, and the like. In addition, since the capturing and holding are automatically performed, the winding start portion can be efficiently and safely fixed.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. In the figure, a bead core forming apparatus 1 includes a winding former 2 having a concave groove 4 on an outer peripheral surface on which a bead wire W for forming a bead core C of a tire T is spirally wound.
And a rotatable support shaft 3 on which the winding former 2 is disposed. In this example, the support shaft 3 is formed of a rotary cylinder 5 and a center shaft 7.

The rotary cylinder 5 is provided with, for example, the side plates 15, 1 of a gate-shaped frame 13 having a pair of side plates 15, 15 standing up.
5, a base cylinder 19 rotatably supported via a bearing piece 16.
A holder 20 for holding the former is integrally fixed to one end of the base cylinder 19. The base cylinder 19 has an inner hole 6 that is concentric with the axis of the support body 3 that is the center of rotation, and, for example, by forming a large diameter between the bearing pieces 16, 16, in this example, the shaft center is used. The frame 1 cannot slide in the direction
Locked to 3. The base cylinder 19 includes an electric motor M attached to the frame 13, for example, a pulley 17A, a drive belt 17B.
And the like, so that the start and stop of the rotation are repeated every time the bead core C is formed. The base cylinder 19 has one end which is one of the bearing pieces 16.
And the holder 20 is attached to the projecting portion.

The holding body 20 includes a base 20A integrally fixed to the protruding portion by using a key or the like, and a body front end extending radially outward and forward from the base 20A is provided with the shaft center. Flange 20B facing at right angles to the
Is provided.

The center shaft 7 has a round shaft shape which is slidably inserted into the inner hole 6 so that the center shaft 7 can move back and forth relative to the rotary cylinder 5 in the axial direction. The base cylinder 19 is provided with an elongated hole 19A extending in the axial direction.
By inserting a locking pin projecting from the center shaft 7 into the elongated hole 19A, the center shaft 7 is locked so as to be integrally rotatable with the rotary cylinder 5. The locking pin may be eliminated by using a square shaft as the center shaft 7.

The center shaft 7 has a front end portion and a rear end portion which extend beyond the base cylinder 19 forward and backward, respectively. A bracket 21 for holding a link body is fixed to the front end portion. Is connected to a forward / backward drive tool 22 for urging the center shaft 7 back and forth.

The advancing / retracting drive 22 is mounted on the frame 13.
An air cylinder 23 which is flanged to a sub-frame 13A and is provided with a rod concentrically with the axis;
The air cylinder 23 includes a floating joint 24, such as a ball joint, attached to the rod end of the air cylinder 23, and a thrust bearing 25 fixed to the joint and attached to the rear end of the center shaft 7. Accordingly, the advance / retreat driving tool 22 can move the center shaft 7 in the axial direction via the thrust bearing 25 as the rod of the air cylinder 23 expands and contracts. Further, since the reciprocating drive 22 is provided with the joint 24,
Since the misalignment between the rod and the center shaft 7 is absorbed and the air cylinder 23 and the center shaft 7 are indirectly connected via the thrust bearing 25, the load on the center shaft 7 by the air cylinder 23 can be reduced. Thrust bearing 2
5 is provided with a rotation stopper 26 extending radially outward from the housing, and the rotation stopper 26 is attached to the subframe 1.
The thrust bearing 25 is prevented from rotating by engaging with the locking portion 13B protruding from the 3A so as to be slidable in the axial direction.

As shown in FIGS. 1 and 2, the winding former 2 is a donut-shaped disc having a center hole concentric with the axis and having a concave groove 4 on the outer peripheral surface. The fan-shaped divided segments 27 are divided into three to four parts around the axis, in this example, four equally divided parts. Further, in this example, as shown in FIG. 2, each divided segment 27 is disposed radially inward and is provided with an inner plate piece 27A held by the flange portion 20B of the rotary cylinder 5, and is disposed radially outward and inward. Plate 27
A, and an outer plate piece 27B which is removably bolted and has a concave groove 4 formed on the outer peripheral surface.

At the rear surface and the center of the inner plate piece 27A, for example, two rails 29 extending inward in the radial direction and parallel to each other are provided, and in the present embodiment, the rails 29 are provided with the flange portions 20B. It is guided by a guide 30 provided on the front surface.

The guide 30 has a substantially wedge-shaped guide groove 30A having a tapered cross-section, which is recessed parallel to each other in the radial direction, so that the rail 29 is engaged with the guide groove 30A without falling. Thus, each divided segment 27 is
It is immovable in the axial direction and slidable in the radial direction in a plane perpendicular to the axial center. The flange portion 20
A rail 29 is provided on the B side and a guide 3 is provided on the divided segment 27 side.
0 may be formed, and various guide means having a well-known structure may be employed as long as the rail and the guide can be engaged with each other without dropping.

Each of the divided segments 27 has a link body 1 extending radially outward from the axis, that is, radially outward from the axis, between the rails 29 and 29 on the rear surface of the inner plate piece 27A.
0 one end is pivotally mounted in the other end of the link member 10, the front end portion of the center pole 7, are pivoted via the bracket 21. Therefore, each divided segment 27 is formed by the center shaft 7 formed by the operation of the air sealing 23.
Can slide simultaneously in the radial direction via the link body 10, and the sliding movement causes the outer peripheral surface of the winding former 2 to expand and contract.

In this embodiment, the diameter of the outer peripheral surface of the winding former 2 at the time of diameter expansion is adjusted by adjusting the relative movement amount between the center shaft 7 and the rotary cylinder 5 in the spindle 3. Is provided.

In the present embodiment, the stopper 11 is fixed to the front end of the center shaft 7 and a stopper 50 to the rotary cylinder 5 via a mounting bracket 51, as shown in FIG. A receiving member 52 capable of adjusting a relative movement amount by contacting the hitting member 50;

As shown in FIG. 7, in the present embodiment, the hitting tool 50 is screwed into a screw hole 53 at the front end of the center shaft 7 and has a center screw hole 54A concentrically formed in a bolt fitting 54.
A damper 55 that is screwed into the center screw hole 54A of the bolt metal fitting 54 with a front end portion being left over;
5 and the bolt fitting 54
And a cap nut 56 which firmly fixes the damper 55 in a double nut shape by being pressed against the head of the head.

The damper 55 is an oil damper in the present embodiment, and is a cylinder 55 having a threaded portion screwed to the bolt fitting 54 and the cap nut 56 provided on the outer peripheral surface.
A and a piston portion 57A that divides the interior of the cylinder 55A into a front chamber and a rear chamber by sliding back and forth while penetrating the front end of the cylinder 55 in a watertight manner and extending slidably with the cylinder 55A at the rear end. The piston 57A includes a rod 57 provided therein and oil 58 sealed in the front and rear chambers. The piston portion 57A forms a small-diameter flow path that exhibits a damper effect by connecting the front and rear chambers. are doing. In this embodiment, for example, a spring piece 59 for returning the rod 57 is provided in the rear chamber.
Is accommodated.

In this embodiment, the receiving member 52 is provided with the holding member 2.
A bolt fitting screwed to the mounting piece 51B of the mounting fitting 51, which is bolted to a front surface of the mounting bracket 0 and extends forward along the axis with a pair of leg pieces 51A, 51A, The receiving member 52 has a receiving portion 52B which can be brought into contact with a contact surface 56S of the front end of the cap nut 56 at the rear end of the screw shaft portion 52A which is detachably attached to the attaching piece 51B.
Is protruding.

The receiving member 52 has a head 52C at the front end of the screw shaft 52A. Therefore, the relative movement amount of the central shaft 7 that moves relatively forward is restricted by the contact between the contact surface 56S and the receiving portion 52B, and as a result, the winding former when the diameter is enlarged is increased. 2 is set. The relative movement amount can be freely adjusted by changing the amount of protrusion G of the receiving portion 52B from the mounting piece 51B. In this example, a plurality of types of receiving members 52 having different amounts of protrusion G are prepared. The bead cores C of various diameters are formed using a single former by adjusting the amount of movement freely by selecting and mounting.

The amount of projection G can be changed by, for example, screwing and reciprocating movement of the receiving member 52. In such a case, the receiving member 52 is, as shown in FIG.
Is long and fixed to the mounting piece 51B using a double nut. The contact surface 5 is normally provided by the bias of the spring piece 59.
The rod 57 of the damper 55 protruding forward beyond 6S is connected to the receiving member 52 prior to the cap nut 56.
By contacting with, the impact with the receiving member 52 is alleviated.

Further, at least one of the four divided segments 27 is provided with the clamp means 12 for fixing the winding start portion W1 of the bead wire W.

As shown in FIGS. 3, 4, 5, and 6, the clamping means 12 is provided at the discontinuous portion 31 where the outer peripheral surface is interrupted by cutting off the outer peripheral surface of the divided segment 27, and at the interrupted portion 31. A lever 32 and a lever 33.

As shown in FIG. 6, the break 31 is
In the standby / stop state of the winding former 2 in which the winding start portion W1 is supplied to the bead core forming device 1, the winding former W1 is moved in parallel with the vertical surface S1 from a position on the outer peripheral surface different from the vertical surface S1 passing through the axis of the winding former 2. In addition, the groove 4 is formed of a substantially rectangular cutout portion having a depth exceeding the bottom surface 4S of the concave groove 4 inward in the radial direction.

Therefore, when the bead wire W is supplied in parallel with the circumferential direction of the former 2, that is, on a plane perpendicular to the axis, the break 31 is located on the upstream side of the supply from the vertical plane S 1. Thereby, the edge of the winding start end W1 is located radially inward of the groove bottom surface 4S and inserted into the break 31. In this example, the standby
In the stopped state, the opening of the break 31 is cut off so as to face upward. Therefore, the supply of the bead wire W is performed by dropping the winding start end W1 into the break 31 from above.

The break piece 31 is provided with a contact piece 32 and a lever 33 without protruding into the concave groove 4. In this embodiment, the contact piece 32 and the lever 33 are assembled in a portable manner. Formed as a clamp unit 12A.

That is, the clamp unit 12A includes the contact piece 32, the lever 33, and the case body 35 for supporting them.
And formed from

The case body 35 has a U-shape in which the front ends of the parallel side plate pieces 35A along the side surfaces 31S, 31S sandwiching the break 31 are connected by a front plate piece 35B.
At 5A, a mounting piece 35C that is bolted to the front surface of the winding former 2 projects from the front plate piece 35B at a position sunk backward.

The contact piece 32 is located on one of the groove walls sandwiching the concave groove 4, in this example, on the side of the rear groove wall F1, and has a block shape bridged between the upper ends of the side plate pieces 35A. . The contact piece 32 has an upper edge e1 substantially aligned with the groove bottom edge E1 on the groove wall F1 side of the concave groove bottom surface 4S, and has a contact surface 36S extending radially inward at right angles to the axis. Part 3
An upper portion 37 having a slope 37S extending radially outward from the upper edge e1 along the groove wall surface on the groove wall F1 side is provided above the lower portion 36.

The lever 33 is provided with the side plate pieces 35A,
A support shaft 39 perpendicular to the vertical surface S1 held between the 35A
, A grip portion 33B having a grip surface 33S protruding radially outward from the pivot portion 33A and facing the contact surface 36S;
And an arm 33C extending rearward from A through the lower portion of the contact piece 36. Therefore, the lever 33 is rotated around the support shaft 39 so that the tip of the gripping portion 33B is positioned on the other (front) groove wall F2 side and the gripping surface 33S is formed.
Can be moved from a separated state Y1 in which the gripping surface 33S is separated from the contact surface 36S to a proximity state Y2 in which the gripping surface 33S is located close to the contact surface 36S with the tip located on one (rear) groove wall F1 side.

The tip of the grip portion 33B is disposed radially inward from the bottom surface 4S, and in this example, the tip is formed in an arc substantially aligned with the bottom surface 4S in the proximity state Y2. .

The arm 33 of the lever 33 has an end 3C.
A biasing means 40 for biasing the end 33e inward in the radial direction is linked to 3e.

That is, the urging means 40 comprises a cylindrical cylinder 41 bolted to the rear surface of the flange 20B.
And slides radially in and out of the cylinder 41 and has a radially outer end which is the arm end 33.
e, and a spring piece 43 mounted in the cylinder and biasing the rod 42 inward in the radial direction. Further, in this example, the rod 41 is attached to the cylinder 41.
An abutment piece 44 for determining the slide end position Q1 of the rod 42 inward in the radial direction by abutting the inner end of the rod 42 is provided. Accordingly, when the winding former 2 is reduced in diameter at the inner slide end position Q1, that is, when the support shaft 39 moves inward in the radial direction, the rod 42 acts so as to push the arm end 33e outward in the radial direction. Then, a counterclockwise moment is generated in the figure around the support shaft 39. As a result, the tip of the grip portion 33B can move to the separated state Y1 located on the groove wall F2 side.

When the winding former 2 expands in diameter from the separated state Y1, a clockwise moment is generated on the contrary, and the tip of the grip portion 33B can move to the close state Y2 located on the groove wall F1 side. When the diameter expansion further proceeds, the rod 42 is dragged by the lever 33 and slides radially outward from the inner slide end position Q1. At this time, the urging force of the spring piece 43 is applied, so that the clockwise turning moment is generated. Can be increased, and the winding start portion W1 can be pressed and held between the grip surface 33S and the contact surface 36S.

As described above, since the clamp means 12 can rotate the lever 33 in conjunction with the expanding / reducing operation of the winding former 2, the winding start portion W1 can be automatically fixed.
Prior to the fixing, the grip 33B of the lever 33 moves from the separated state Y1 to the close state Y2.
The winding start portion W1 supplied into the inside 1 can be captured irrespective of its supply position, which can facilitate simplification of the structure of the wire supply means and secure clamping. Instead of the abutting piece 44, the end of the arm 33C may be abutted against the flange 20B so as to protrude outward in the radial direction near the reduced diameter end of the winding former 2.

In this example, as shown in FIGS. 3 and 6 ,
The holding of the bead wire W held above the winding former 2 in the reduced diameter state is released, and the bead wire W is naturally dropped into the discontinuous portion 31 to supply the winding start portion W1 to the winding former 2. Accordingly, in order to ensure this drop, in this example, the winding start portion W1 is interrupted by extending radially outward from the outside along the groove wall to the outer end of the groove wall F1 and both sides of the interruption portion 31 from the outside. Guide piece 6 having guide surface 61S for guiding inside portion 31
1, 61 are provided.

The mounting bracket 51 includes the mounting bracket 51.
A guide piece 62 is attached, the outer end of which extends toward the break 31 from the front plate piece 35B of the case body 35 and the lever 33. The outer end of the guide piece 62 is
When the winding former 2 is in the reduced diameter state, the winding former 2 has a guide surface 62S extending radially outward from the position of the outer end of the groove wall F2 along the groove wall surface, and guides the dropping of the winding start portion W1. Further, the outer end of the guide piece 62 is located radially inward of the groove bottom surface 4S of the winding former 2 in the expanded state, thereby facilitating removal of the completed bead core C from the winding former 2.

FIG. 14 shows another embodiment of the lever 33. In the figure, the lever 33 has a pivot 33A formed by first and second pivots 33Aa and 33Ab pivotally supported around a pair of support shafts 39a and 39b arranged in parallel with each other. The pivot portions 33Aa and 33Ab are connected via a gear body 99 that meshes with each other. A grip 33B having a grip surface 33S is provided on one of the pivots 33Aa.
However, an arm 33C extending rearward is formed on the other pivot 33Ab. Therefore, the tilting operation of the gripping portion 33B can be changed left and right, and in conjunction with the expanding / contracting operation, the tip of the gripping portion 33B moves from the separated state where it is located on one groove wall F1 side to the close state where it is located on the other groove wall F2 side. Moving.

FIG. 13 shows a bead core forming apparatus 1 of this embodiment.
5 shows a bead core forming line L using. In the figure, in the standby / stop state of the bead core forming apparatus 1 in which the diameter of the former 2 is reduced, the bead wire W with rubber is attached.
Are a habit tool 70, a feed roller 71, and a guide tool 72.
The winding start portion W1 is held by the holder 73 after passing through. Thereafter, the winding start portion W1 is moved to a position above the interruption portion 31 by the travel of the traveling base 75 due to the expansion and contraction of the cylinder 74, and the winding start portion W1 is supplied into the interruption portion 31 by releasing the holding member 73. The bead core forming apparatus 1 rotates the former 2 after fixing the winding start portion W1 by the clamp means 12, and winds the bead wire around the concave groove 4. During this winding, the guide member 72 intermittently moves in the axial direction to form a spiral winding of the bead wire W. After winding is completed, cylinder 7
Holder 73 descending at standby position by operation of 4 and 76
However, the bead wire W is grasped and the cutter 77 is cut.

Here, the guide 72, the holder 73, and the cutter 77 are supported by a horizontal moving table 78 movably mounted on the traveling table 75, and the guide 72 is held by the cylinder 79 by the cylinder 79. The cutter 77 is supported by the cylinder 76 so as to be able to descend.

[0046]

As described above, the bead core forming apparatus of the present invention allows the outer peripheral surface of the winding former to be enlarged and reduced in diameter, so that the bead core can be easily removed and bead cores having various inner diameters can be formed using one former. it can.
Further, since the grip portion of the lever can be moved in conjunction with the radial movement of the former, the wire can be reliably and automatically clamped accurately without affecting the supply position of the bead wire in the discontinuity.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is a perspective view showing an attached state of a divided segment and a spindle.

FIG. 3 is a perspective view showing a clamping unit.

FIG. 4 is a sectional view showing a clamping means.

FIG. 5 is a perspective view showing a clamp unit.

FIG. 6 is a cross-sectional view illustrating a break.

FIG. 7 is a sectional view illustrating a stopper.

FIG. 8 is a sectional view showing another embodiment of the stopper.

FIG. 9 is a sectional view showing a tire.

FIG. 10 is an enlarged sectional view showing the bead core.

FIG. 11 is a cross-sectional view illustrating a conventional technique.

FIG. 12 is a cross-sectional view illustrating a conventional technique.

FIG. 13 is a schematic view showing an example of a bead core forming line using the apparatus of the present invention.

FIG. 14 is a sectional view showing another example of the clamping means.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 2 Winding former 3 Support shaft 4 Concave groove 4S Bottom surface 13 Frame 27 Divided segment 31 Cut off portion 32 This piece 33 Lever 33B Gripping portion F1, F2 Groove wall C Bead core T Tire W Bead wire W1 Winding start portion

Claims (1)

(57) [Claims] 1. A winding former having a groove on an outer peripheral surface.
When, a bead core forming apparatus for forming a bead core of the tire by a supported while rotatable shaft member comprises in this winding former is arranged and the frame, the bead wire is wound around the groove of the winding former the winding former is comprised of a plurality of divided segments provided with the concave groove in a fan Moreover peripheral surface is divided about the axis of the support shaft member, the radius at the split segment the axis perpendicular to a plane the outer peripheral surface by simultaneously sliding direction is disposed in the scaled size capable shaft member, yet at least one split segments, the outer peripheral surface thereof
Having a depth exceeding the bottom surface of the groove inward in the radial direction.
Includes a discontinuous part where the outer peripheral surface is interrupted by being cut off
And the discontinuity is at the end of the winding start of the bead wire.
The edge is a plane that is perpendicular to the axis and is half the bottom of the groove.
A contact piece that can be inserted radially inward and is inserted into the break, and that is located on one groove wall side sandwiching the concave groove and extends radially inward from the bottom surface; sandwiching the winding start portion between the pivoted and the tip diameter state moves tip the one groove wall side along with the position and moreover expanded to other groove wall those pieces in portion A bead core forming apparatus comprising: a lever having a grip portion.