JP2008296407A - Tire molding method and tire molding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To positively detect termination of a folding process in tire molding and quickly transfer to the next process. <P>SOLUTION: In the tire molding in which a side part of a carcass band wrapped around a tire molding drum main body is folded, a limit switch LS is installed on a stopper wall part 22a abutting on a folding finger 11 in a stand-by position. A control part 50 receives ON/OFF signals of the limit switch LS via a remote sensor RS. After starting of the folding process of the carcass band, when the control part 50 receives an ON signal from the limit switch LS, the control part 50 determines that the folding process has terminated, and starts the next process. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tire molding method and a tire molding apparatus that perform folding of a carcass band by folding a side portion of a carcass band around a bead core using a tire molding drum.

  A plurality of folding fingers provided so as to be swingable so as to expand and contract radially around the tire molding drum body, a folding roller rotatably supported at the tip of the folding finger, and the folding fingers are synchronized. A tire molding method and a tire molding, including a finger moving means for moving the molding drum inward and outward in the axial direction, and folding a carcass band side portion located outside the bead core in the tire axial direction around the bead core to form a green tire Devices are known (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

When performing tire molding using these tire molding drums, usually, after the carcass band folding process with the folding fingers, the carcass bands are folded and the carcass bands are bonded to each other. Stitching is performed while rotating.
The transition from the folding process to the next stitching process needs to be performed quickly in accordance with the end timing of the folding process of the carcass band, but the conventional tire molding apparatus has a mechanism for detecting the operation of the folding fingers. Since it is not provided, the end of the folding process cannot be directly detected from the operation of the folding finger.

Therefore, in the conventional tire molding apparatus, in order to measure the timing of shifting to the next process after the folding process of the carcass band, a timer is started in accordance with the timing of starting the folding finger, and a predetermined time has elapsed. Then, it is configured to automatically shift to the next process on the assumption that the folding process by the folding finger has been completed.
However, if there is a variation in the timing of the end of the operation of the return finger, the timer may expire in a state where the return finger does not return to the standby position (non-operation position), and the process may proceed to the next step.
In the next step, stitching is usually performed while rotating the molding drum at a high speed as described above. Therefore, if the folding finger moves to the next step before it completely returns to the standby position, the centrifugal force due to the rotation of the molding drum In response to the action, the folded fingers are expanded. In that case, it is dangerous if a person or the like touches the folding finger that expands and rotates at a high speed, and the folding finger itself may be damaged.

  Therefore, it is possible to lengthen the timer setting time in consideration of the variation in the timing of the end of the folding finger folding operation. However, if the timer setting time is lengthened, a wasteful waiting time is generated and productivity is increased. Another problem that comes down is that.

As far as the point of detecting the end of the folding operation of the folding finger is concerned, for example, a driving unit for assisting folding, such as a hydraulic cylinder control device or a ball screw driving device, is not mounted on the molding drum. In the tire molding apparatus provided outside the molding drum, the end state of the folding operation of the folding fingers (that is, the state where the folding fingers are returned to the standby position) can be confirmed by these driving units.
However, since a device having a drive unit outside (a drive unit non-mounting type device) is large-scale and there is a problem such as oil leakage when switching a tool such as a tire molding drum provided with a folding finger, the above folding is performed. The above configuration cannot be adopted only for the purpose of confirming the operation of the finger.
Japanese Patent Laid-Open No. 2002-80404 Japanese Patent Application Laid-Open No. 2003-80612 JP 2005-246823 A

  The present invention has been made in view of the above problems in a tire molding drum having a conventional folding finger, and its purpose is a tire molding drum equipped with a driving unit for the folding finger, and the folding finger folding operation. The end of the tire can be detected reliably, and the process can be promptly shifted to the next step after the end detection, so that the green tire can be molded safely and efficiently.

The invention according to claim 1 is a tire molding method, and includes a step of folding back an end portion of a tire constituent member wound around a tire molding drum body by a folding means, wherein the folding means performs a folding operation. A step of detecting an end, and a step of controlling the start of the next step when the end of the folding operation is detected.
According to a second aspect of the present invention, in the tire molding method according to the first aspect, the step of detecting the end of the folding operation is a step of detecting an operation end position of the folding means.
Invention of Claim 3 has the process of stopping the operation | movement in the tire shaping | molding method described in Claim 1 or 2, when the operation | movement completion position of the said folding | turning means is not detected except at the time of the said folding | turning operation | movement. Features.
The invention of claim 4 is a tire molding apparatus, which is a tire molding apparatus for molding a tire using a tire molding drum main body and a tire molding drum provided with folding means on both axial sides thereof, wherein the folding means is folded. It has a means for detecting an operation end position, and a control means for performing start control of the next process based on the detection of the folding operation end position.
According to a fifth aspect of the present invention, in the tire molding apparatus according to the fourth aspect, the means for detecting the folding operation end position is a switch means that is disposed on the tire molding drum and is operated by the folding means. It is characterized by.
According to a sixth aspect of the present invention, in the tire molding apparatus according to the fourth or fifth aspect, the switch means includes a limit switch disposed at a sliding end portion of the folding means on the tire molding drum, It is characterized by comprising a limit switch and a remote sensor connected to the control means so as to be able to transmit signals.
According to a seventh aspect of the present invention, in the tire molding apparatus according to any one of the fourth to sixth aspects, the control means operates when the operation end position of the folding means is not detected except during the folding operation. It is characterized by performing stop control for stopping the operation.

According to the present invention, since the end of the folding operation of the folding means can be detected, the following effects are obtained. That is,
(1) The risk of the folding means shifting to the next process before the end of the operation can be surely prevented, and productivity can be improved because the process can be quickly transferred to the next process after the folding process is completed.
(2) Even after the end of folding, if the folding fingers are unfolded by mistake during the drum rotation, it can be detected and the tire molding apparatus can be stopped in an emergency, improving safety.

  A tire molding apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view in the central axis direction showing an upper half of a tire molding drum equipped with a carcass band turning device according to an embodiment of the present invention.

  As shown in FIG. 1, the tire molding drum 1 is provided on a central shaft 2, a pair of sleeves 3 that are spaced apart from each other in the axial direction on the central shaft 2, and an outer peripheral surface of each sleeve 3. Independently, the sliders 4 are separated from each other and approached and displaced. On the outer periphery of the slider 4, a bead lock means 7 for fixing and supporting the bead core and a carcass band folding device 10 are fixed.

  In the central portion in the axial direction between the two bead lock means 7, a core body 8 that expands and contracts in the radial direction constituting the tire molding drum main body is provided, and with respect to the rigid support member 8 a that constitutes the core body 8, One end is connected to the other end of the link mechanism 9 comprising a pair of links 9a to which the sleeve 3 is attached and the middle is hinged.

  An inner end (in the drawing, the center side) of the slider 4 is formed of a reinforcing rubber film that extends radially outward of the core body 8 and seals the space around the core body 8 to expand and contract in a toroidal shape. The center bladder C is fixed.

  The slider 4 is spaced apart and moved symmetrically by the rotation of the screw shaft S provided in the hollow portion in the central shaft 2, and the pair of bead lock means 7 mounted on the slider 4 is moved away and moved closer.

  In FIG. 1, the carcass band folding device 10 is provided so as to be swingable in a plane parallel to the drawing centering on the base end portion 17 (in each plane including the center line of each carcass band folding device 10 and the central axis 2). The folding fingers 11 are provided, and the folding fingers 11 are arranged in an annular shape, for example, at equal intervals in the circumferential direction of the tire molding drum.

  FIG. 2 is an enlarged partial cross-sectional view showing the carcass band folding apparatus 10 in a cross section including the central axis of the tire molding drum. FIG. 2A shows a state before folding, and FIG. 2B shows a state during folding.

  The carcass band folding device 10 includes a pair of folding rollers 14 (14a, 14b) rotatably supported at the tip portions of the folding fingers 11, finger moving means 20 for reciprocating the folding fingers 11 in the axial direction, There is provided an elastomer band (not shown) that bundles the folding fingers 11 and always urges the inner side in the radial direction of the forming drum, that is, in the diameter reducing direction.

  The finger moving means 20 includes a cylinder base 22 fixed on the circumference of the slider 4, a first sliding wall 23 and a second sliding wall 24 that slide on the outer circumference of the cylinder base 22, and these sliding walls. The cylinder wall 27 is connected to the cylinder base 22 and the fixed wall 21 is fixed to the outer periphery of the cylinder base 22. The fixed wall 21, the first sliding wall 23, and the cylindrical wall 27 form a first pressure chamber 26a, and the fixed wall 21, the second sliding wall 24, and the cylindrical wall 27 similarly form a second pressure chamber 26b. Yes.

  The proximal end portion 17 of the folding finger 11 is fixed to the first sliding wall 23 so as to be able to expand and contract the folding roller 14 (14a, 14b) at the tip thereof, and the first and second pressure chambers. Air holes 25 a and 25 b are formed in the air holes 26 a and 26 b adjacent to the fixed wall 21, respectively.

  In the above configuration, when the pressurized air is supplied from the air hole 25a to the first pressure chamber 26a and at the same time, the air in the second pressure chamber 26b is exhausted from the air hole 25b, the first sliding wall 23 is out of the axial direction. The folding finger 11 which is moved in the direction (right side in the figure) and is integrally formed therewith is also displaced outward in the axial direction. Conversely, when air is supplied from the air hole 25b to the second pressure chamber 26b and at the same time the air in the first pressure chamber 26a is exhausted from the air hole 25a, the second sliding wall 24 is moved inward in the axial direction (left side in the figure). It moves, and the folding | turning finger | toe 11 is also displaced to an axial direction inside.

  Thus, the folding finger 11 is displaced inward and outward on the molding drum 1 by switching between supply and exhaust of the first and second pressure chambers 26a and 26b, and the folding roller 14 (14a and 14b) provided at the tip thereof. The side part of the carcass band K is folded back around the bead core B and gradually spreads upward (radially toward the tire outer circumference). Return.

  The structure of the tire molding device according to the present embodiment described above is basically the same as that of the conventional one described in, for example, Patent Document 3, but in this embodiment, the operation of the folding finger 11 is performed. A configuration for reliably detecting whether or not it is in the standby position is provided.

  That is, for example, as shown in FIG. 2B, the right end of the cylinder base 22 illustrated in FIG. 2B does not perform the folding operation, that is, the stopper wall portion with which the proximal end portion 17 of the folding finger 11 in the standby position abuts. 22a is provided. In the present embodiment, a limit switch LS that is actuated when the folding finger 11 comes into contact with the stopper wall portion 22a is disposed. As will be described below with reference to FIG. 3, the limit switch LS is connected to a control unit of the tire molding apparatus via a remote sensor RS provided separately so as to transmit a signal.

FIG. 3 is a front view of a tire molding apparatus according to this embodiment provided with the tire molding drum 1.
In the tire molding apparatus T, a rotation driving unit 30 of the tire molding drum 11 is disposed on the right side in the drawing centering on the tire molding drum 1, and the rotation driving unit 30 and the tire molding drum 1 are connected by a joint 32. Has been. Further, the bearing 33 is supported on the left side of the tire molding drum 1 by a columnar drum tip support member 40. On the support member 40, a support base 44 that supports the bearing portion 33, and a support 46 for mounting the output portion RS (1) of the remote sensor RS projecting upward from the support base 44.

  A transmission portion RS (2) of the remote sensor RS is attached to the shaft end of the tire molding drum 1 supported by the bearing portion 33 so as to face the output portion RS (1) of the remote sensor RS. The output part RS (1) and the transmission part RS (2) of the remote sensor RS are both concentric with the rotating shaft of the molding drum 1, and the transmission part RS (2) of the remote sensor RS has a limit described later. The switch LS is connected by a conductive wire W1.

Here, the remote sensor RS transmits, for example, a high-frequency signal wirelessly transmitted from the output unit RS (1) to the transmission unit RS (2), and the transmission unit RS (2) uses the received high-frequency signal as a power source. This is well known per se for wireless transmission of signals to the output RS (1).
The transmission unit RS (2) has a function as a power source for supplying power to the limit switch LS.

Next, detection means for reliably detecting whether or not the folding finger 11 is in the standby position after the folding process is completed will be described.
As described above, the limit switch LS provided on the stopper wall portion 22a is turned on by detecting the base end portion 17 when the folding finger 11 is positioned at the standby position.
In the present embodiment, the limit switch LS is configured to be immediately turned off when the folding finger 11 leaves the standby position and immediately turned on when the return finger 11 returns to the standby position, but the ON and OFF are reversed. May be.
The limit switch LS may be any type, but a mechanical switch that can operate reliably without malfunction is preferable.

  Here, it is not necessary to provide the limit switches LS corresponding to all the folding fingers 11, and it is sufficient to provide one for each of the left and right stopper wall portions 22a in FIG. This is because the folding fingers 11 arranged on the same side with respect to the tire molding drum 1 have a common driving member including the elastomer band and can be considered to perform the same operation.

  In this embodiment, the ON / OFF signal of the limit switch LS is transmitted to the transmission unit RS (2) of the remote sensor RS through the conductive wire W1, and from there, the output unit RS (1) of the remote sensor RS. Is further transmitted to the control unit 50 of the tire molding apparatus T through the conductive wire W2 from the output unit RS (1) of the remote sensor RS, where it is determined whether or not the folding finger 11 is in the standby position. Etc. are performed. Note that the output unit RS (1) of the remote sensor RS and the control unit 50 can be connected so as to be able to transmit signals wirelessly.

  The control unit 50 controls the entire operation of the tire molding apparatus T. As shown in FIG. 3, the control unit 50 temporarily stores a CPU 52, a ROM 54 storing a control program, and processing data of the CPU 52. For example, an ON / OFF signal is input from the output unit RS (1) of the remote sensor RS via an interface (not shown) and the like, and necessary processing and control are performed.

  For example, the control unit 50 determines whether or not the folding finger 11 is in the standby position based on the ON / OFF signal of the sensor. Here, when the switching finger 11 is switched from OFF to ON, the folding finger 11 is in the standby position. It is determined that the process has returned, that is, the folding process has been completed. Conversely, when switching from ON to OFF, it is determined that the folding process has started.

FIG. 4 is a flowchart illustrating an example of a processing procedure of the control unit 50.
When the folding process starts, the folding finger 11 moves away from the limit switch LS, the limit switch LS is switched from ON to OFF (S101, YES), and the carcass band side folding process is executed (S102). Thereafter, when the folding process is completed and the folding fingers 11 return to the standby position all at once, the limit switch LS is switched from OFF to ON. When it is determined that all the limit switches have been switched from OFF to ON (S103, YES), the controller 50 starts the next process (S104). The control unit 50 monitors whether all the limit switches LS are in the ON state in the next process (S105), maintains all the limit switches LS in the ON state (S105, YES), and finishes the process in the next process. If (S106, YES), the process of the next process is terminated.
If the limit switch LS is turned OFF during the next process (S105, NO), the tire molding apparatus T is stopped urgently (S107), and the tire molding process is stopped.

  In the present embodiment, a proximity switch can be used instead of the limit switch. Each limit switch LS has been described as receiving power from the transmission unit RS (2) of the remote sensor RS. However, each limit switch LS is provided with a battery so that operating power is supplied from the battery. Good. Further, the limit switch LS and the transmission unit RS (2) of the remote sensor RS can be wirelessly connected.

In the present embodiment, the tire molding drum 1 has a drum tip support member 40 as shown by a broken line in FIG. 3 by removing the joint 32 on one end side and releasing the fixing of the support base 44 on the other end side. Is moved outwardly about the pivot 42 and removed. Further, the tire molding drum 1 is exchanged by performing the reverse operation to the above.
Therefore, the output part RS (1) of the remote sensor RS attached to the drum tip support member 40 side is commonly used for the tire molding drum to be replaced. That is, when exchanging the tire molding drum 1, leave only the output portion RS (1) of the remote sensor RS and replace it with the molding drum 1, or remove the transmission unit RS (2) from the tire molding drum 1. Then, the tire molding drum 1 after replacement is mounted again.
In any case, a conductive wire W1 is provided between the attachment portion of the transmission portion RS (2) and each limit switch LS, and a connection path is provided on the tire molding drum side.

The molding process of the green tire using this carcass band folding device 10 is the same as the conventional one.
The rigid support member 8a is further expanded to the maximum diameter, and with the rigid support member 8a as a support, a belt member, a tread member, a rubber chafer member, or the like is attached to the outside of the carcass band to complete a green tire. Thereafter, the diameter of the rigid support member 8a is reduced, and the green tire is taken out from the tire molding drum 1 to complete the process.

  According to the present embodiment, the end of the folding finger folding process can be reliably detected in the tire molding drum on which the driving mechanism of the folding finger folding mechanism is mounted. As a result, it is not necessary to use a non-mounting type drive mechanism as described above for the tire molding apparatus, and the tire molding drum is a folding finger drive mechanism mounted type. Easy.

In addition, the remote sensor RS performs power supply to the limit switch LS, signal transfer, and signal exchange with the other party (drum tip support part) in a non-contact manner, but on the same core (on the rotating shaft). Because it is installed, the signal can be continuously picked up while the drum is rotating.
Therefore, not only can the process immediately proceed to the next process after the folding process of the folding finger 11, but the limit switch LS is immediately switched from ON to OFF when the folding finger 11 is expanded by centrifugal force during drum rotation. The part 50 can judge that it is abnormal and can stop the tire molding apparatus urgently.

It is sectional drawing of the upper half along the axis line of the tire molding drum of the tire molding apparatus which concerns on embodiment of this invention. FIG. 2 is an enlarged cross-sectional view of the carcass band folding device of the tire molding drum shown in FIG. 1, FIG. 2A shows a state in which the carcass band folding device is in a standby position, and FIG. 2B shows a state in the same folding position. It is the front view which showed the said tire shaping | molding apparatus along the axis line. It is a flowchart which shows the example of control of the said tire shaping | molding apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Tire molding drum, 2 ... Center axis, 3 ... Sleeve, 4 ... Slider, 7 ... Bead lock means, 8 ... Core body, 10 ... (carcass) band Folding device, 11 ... Folding finger, 14 (14a, 14b) ... Roller, 17 ... Base end, 20 ... Folding finger moving means, 21 ... Fixed wall, 22 ... Cylinder Base, 22a ... Wall for stopper, 23 ... First sliding wall, 24 ... Second sliding wall, 25a, 25b ... Air hole, 26a ... First pressure chamber, 26b ... Second pressure chamber, 27 ... Cylinder wall, 30 ... Rotation drive part, 32 ... Joint, 33 ... Bearing part, 40 ... Drum tip support member, 42 ... Pivot , 44 ... support base, 50 ... control unit, B ... bead core, K ... Kerka Band, LS · · · limit switch, RS · · · remote sensor, S · · · screw shaft.

Claims (7)

A tire molding method including a step of folding back an end portion of a tire constituent member wound around a tire molding drum body with a folding means,
Detecting the end of the folding operation of the folding means;
A step of performing start control of the next step when detecting the end of the folding operation;
A tire molding method characterized by comprising: In the tire molding method according to claim 1,
The step of detecting the end of the folding operation is a step of detecting the operation end position of the folding means. In the tire molding method according to claim 1 or 2,
A tire molding method comprising a step of stopping the operation of the folding device when the operation end position of the folding device is not detected except during the folding operation. A tire molding apparatus for molding a tire using a tire molding drum body and a tire molding drum provided with folding means on both axial sides thereof,
Means for detecting a folding operation end position of the folding means;
Control means for performing start control of the next process based on detection of the folding operation end position;
A tire molding apparatus comprising: In the tire molding device according to claim 4,
The tire molding apparatus according to claim 1, wherein the means for detecting the end position of the folding operation is switch means that is disposed on the tire molding drum and is operated by the folding means. In the tire molding device according to claim 4 or 5,
The switch means includes a limit switch disposed at a sliding end portion of the folding means on the tire molding drum, and a remote sensor connected to the limit switch and the control means so as to transmit signals. A tire forming apparatus that is characterized. In the tire molding device according to any one of claims 4 to 6,
The tire molding apparatus according to claim 1, wherein the control means performs stop control to stop the operation when the operation end position of the folding means is not detected except during the folding operation.

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