JP2012183665A - Device and method for manufacturing tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire manufacturing device that can keep strain from occurring in a circular tread when assembling the circular tread to a base tire, and to provide a method for manufacturing the tire.SOLUTION: The tire manufacturing device for assembling the circular tread to an outer peripheral surface of the base tire includes: a base tire fixing means for fixing the base tire; a measuring means for measuring the maximum outer diameter of the base tire; a plurality of holding means which are extended in the width direction of the circular tread, and hold the inner peripheral surface of the circular tread; a diameter expansion means for moving the holding means to the outside in the radial direction of the circular tread, and expanding a diameter of the circular tread; and a control means for controlling the diameter expansion means so that a diameter of a virtual incircle in contact with the inner peripheral surface of the circular tread held by the holding means is made larger than the maximum outer diameter of the base tire measured by the measuring means, and the circular tread whose diameter is expanded is shrunk on the outer peripheral surface of the base tire.

Description

  The present invention relates to a tire manufacturing apparatus and a tire manufacturing method, and more particularly to an apparatus and a method for manufacturing a tire by assembling a tread that has been previously formed into an annular shape to a base tire.

As one of the tire manufacturing devices, a base tire as a tire base and an annular tread as a tread surface of a pre-vulcanized tire are individually held by a plurality of units, and the units are brought close to each other There is known a tire manufacturing apparatus in which an annular tread is assembled to an outer peripheral surface of a tire.
As main components of the tire manufacturing apparatus, there are a drum unit that holds the base tire in a state where an internal pressure is applied, and a tread diameter-expanding means that holds the annular tread so as to be expandable and contractible. The tread diameter expanding means holds the annular tread with a plurality of rod-shaped bodies so that the inner diameter of the annular tread is larger than the outer diameter of the base tire and expands the diameter, and the annular tread is formed on the outer peripheral surface of the base tire. On the other hand, it arrange | positions in a predetermined position and the operation | movement which assembles | attaches an annular tread and a base tire integrally by pulling out the rod-shaped body holding an annular tread from an annular tread.

  However, tires that are used as pedestal tires are tires that have been used for the first time as pedestal tires, tires that have already been re-treaded, and tires that have the same size but have different structures. It is necessary to mold the base tire by changing the outer diameter of the base tire after buffing even if the tire has the same size. Nevertheless, if the tires are the same size, the annular tread is uniformly expanded to a predetermined size and integrated with the base tire. The diameter is increased more than necessary, and when it is integrated with the base tire, it is pasted with waviness and distortion in the circumferential direction, causing manufacturing defects and variations in product performance. There is a risk of letting you.

JP 50-158676 A

  In order to solve the above-described problems, the present invention provides a tire manufacturing apparatus and a tire manufacturing method that can prevent distortion of an annular tread when the annular tread is assembled to a base tire.

A tire manufacturing apparatus for assembling an annular tread on the outer peripheral surface of a base tire as a configuration for solving the above-mentioned problem, wherein the base tire fixing means for fixing the base tire and a measuring means for measuring the maximum outer diameter of the base tire A plurality of holding means extending in the width direction of the annular tread and holding the inner peripheral surface of the annular tread, and moving the holding means outward in the radial direction of the annular tread to expand the diameter of the annular tread. The diameter means and the diameter of a virtual inscribed circle in contact with the inner circumferential surface of the annular tread held by the holding means are larger than the maximum outer diameter of the base tire measured by the measuring means, and the diameter is increased. Control means for controlling the diameter-expanding means so as to reduce the diameter of the annular tread on the outer peripheral surface of the base tire is adopted.
According to this configuration, the outer diameter of the base tire is measured, and the annular tread can be expanded to an individual size corresponding to the outer diameter of the base tire. However, it is possible to suppress the diameter from being increased more than necessary. Therefore, the annular tread assembled on the outer peripheral surface of the base tire does not become a wavy state, and the performance of the tire can be made uniform.
As another configuration of the present invention, the control means controls the diameter expanding means so that the increase rate of the diameter of the virtual inscribed circle is 12% or less with respect to the inner diameter of the annular tread before the diameter expansion. It was set as the structure to do.
According to this configuration, since the size of the annular tread is 12% or less, the size of the expanded annular tread returns to the size of the annular tread before the expansion. Waves of the annular tread when the annular tread is assembled to the base tire can be prevented.

Further, as a form for solving the above-mentioned problem, a tire manufacturing method for assembling an annular tread on the outer peripheral surface of a base tire, measuring the maximum outer diameter of the base tire fixed rotatably, The inner peripheral surface is held by a plurality of holding means, the holding means is moved radially outward of the annular tread to expand the diameter of the annular tread, and the virtual contact with the inner peripheral surface of the annular tread held by the holding means The diameter of the inscribed circle was made larger than the maximum outer diameter of the base tire, and the expanded annular tread was reduced in diameter on the outer peripheral surface of the base tire.
According to this embodiment, the outer diameter of the base tire is measured, and the annular tread can be expanded to an individual size corresponding to the outer diameter of the base tire. However, it is possible to suppress the diameter from being increased more than necessary. Therefore, the annular tread assembled on the outer peripheral surface of the base tire does not become a wavy state, and the performance of the tire can be made uniform.
As another form, the diameter of the annular tread is expanded so that the increase rate of the diameter of the virtual inscribed circle is 12% or less with respect to the inner diameter of the annular tread before the expansion.
According to this embodiment, since the size of the annular tread is 12% or less, the size of the expanded annular tread returns to the size of the annular tread before the expansion. Waves of the annular tread when the annular tread is assembled to the base tire can be prevented.

1 is an overall schematic diagram of a tire manufacturing apparatus. The top view and side view of a tread diameter-expansion apparatus. The side view and top view of a holding means. The top view and side view of a pressing device. The side view of a break-in apparatus. The top view and side view which show the relationship between the measurement means which measures the maximum radius of a base tire, and a base tire. The conceptual diagram for defining the amount of slack E which arises in the inner peripheral surface side edge of a tread when it is hold | maintained at a holding means. The flowchart which shows the assembly | attachment operation | movement of the annular tread to a base tire.

  Hereinafter, the present invention will be described in detail through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included in the invention. It is not necessarily essential to the solution, but includes a configuration that is selectively adopted.

Hereinafter, the tire manufacturing apparatus 1 of the present invention will be described.
FIG. 1 is an overall schematic view of a tire manufacturing apparatus 1 for assembling an annular tread 11 on the outer peripheral surface of a base tire 10. As shown in FIG. 1, the tire manufacturing apparatus 1 includes a base tire holding device 2 that fixes a base tire 10, a tread diameter increasing device 3 that expands an annular tread 11 that has been vulcanized and molded in advance, and a base tire 10. A running-in device 4 that presses the surface of the annular tread 11 assembled to the tire, a pressing device 7 that presses the annular tread 11 so as not to be displaced when the annular tread 11 is assembled to the base tire 10, and an annular tread. And a control device 9 that performs control for assembling 11 to the base tire 10. Each of these devices is mounted on a base 6 whose mounting surface is formed horizontally. The base tire is formed by buffing a new base tire or a used tire and sticking the annular tread 11 to the outer peripheral surface of the tire in advance. The annular tread 11 is vulcanized and molded in advance in an annular shape, and is molded with a predetermined curvature along the outer peripheral surface of the base tire 10 in the tread width direction. For example, the cross-sectional curved shape is formed so that the tread inner diameters at both ends in the tread width direction are smaller than the tread inner diameter at the center position in the tread width direction. The inner diameter of both ends in the width direction of the annular tread 11 is smaller than the maximum outer diameter of the base tire 10.
Hereinafter, each device will be described in order.

The base tire holding device 2 includes a holding device main body 21, a drum shaft 22 that extends horizontally from the inside of the holding device main body 21 to the outside, a drum motor 24 that rotates the drum shaft 22, and a tip portion of the drum shaft 22. And a drum 23 which is fixed and fixes the base tire.
The holding device body 21 is mounted on one side of the base 6 in the longitudinal direction F, and the drum shaft 22 penetrates in the longitudinal direction F. The drum shaft 22 is rotatably supported by a bearing (not shown) fixed to the holding device main body 21. A drum 23 is attached to the tip of the drum shaft 22, and a pulley 29 is attached to the other end. The drum 23 is an expansion drum that can be held in a state where an internal pressure is applied to the base tire 10. The drum 23 is provided in a factory and is connected to a pipe extending from an air supply unit (not shown) that supplies air to machines in the factory, and an internal pressure is applied by the air supplied from the air supply unit. Note that the air supply means may include a compressor built in the holding device body 21 to supply air to the drum 23. Further, the drum 23 has a function of fixing the center in the width direction of the base tire 10 at a predetermined position in the width direction of the drum 23 when the base tire 10 is held. Therefore, even if the drum 23 is a base tire 10 of a different size, the tire equatorial region where the maximum diameter of the base tire 10 can be positioned at a certain position of the drum 23. The drum motor 24 that rotates the drum 23 is constituted by a servo motor, for example, and rotates based on a signal output from the control device 9 described later. A pulley 25 is attached to the rotation output shaft 24 a of the drum motor 24, and the rotation of the drum motor 24 is transmitted to the drum shaft 22 by passing the belt 40 between the pulley 29 and the pulley 25 fixed to the drum shaft 22. .
Note that the drum motor 24 may be a geared motor that includes a speed reduction mechanism inside the motor and is output in a state where the rotational force of the motor is reduced, and rotates based on a signal output from the control device 9. If it is good.

2A shows a plan view of the tread diameter increasing device 3, and FIG. 2B shows a side view of the tread diameter increasing device 3. FIG.
The tread diameter increasing device 3 is disposed so as to face the drum 23, holds the annular tread 11 assembled to the base tire 10 so as to be freely expandable and contractable, and approaches or separates from the base tire 10 fixed to the drum 23. The tread diameter expanding device 3 includes a moving mechanism 5 for moving closer to and away from the base tire 10, a disk frame 31 serving as a base for holding the annular tread 11, and an expanding and contracting of the annular tread 11. It has a diameter expanding means 32 and a holding means 33 for holding the annular tread 11 in a predetermined position.
The moving mechanism 5 is composed of a pair of linear motion mechanisms. Examples of the linear motion mechanism include a mechanism called a linear guide. The linear guide includes, for example, a linear linear rail 13A, a slider 13B that moves along the linear rail 13A, and a ball screw mechanism (not shown) that is a drive mechanism for the slider 13B. In the ball screw mechanism, a screw portion is accommodated in the linear rail 13A, and a nut portion that is screwed with the screw portion is built in the slider 13B.
The moving mechanism 5 is arranged on the base 6 at a predetermined distance so that the extending direction of the linear rails 13A: 13A is parallel to the extending direction of the rotation center axis A of the drum 23. At least one of the linear guides is attached with a servo motor serving as a drive source for the ball screw mechanism. The servo motor is connected to the control device 9 and moves the pedestal 52 forward and backward with respect to the drum 23 based on an advance / retreat signal output from the control device 9. A pedestal 52 on a flat plate for fixing the disc frame 31 is installed on the slider 13B. The tread diameter increasing device 3 may be disposed on the same linear rail 14A as the moving mechanism 70 described later.

  The disk frame 31 is a base body of the tread diameter increasing device 3 and is a disk body formed larger than the diameter of the annular tread 11 assembled to the base tire 10. The disc frame 31 is fixed on the pedestal 52 via a fixing jig so that the center of the disc frame 31 and the rotation center axis A of the drum shaft 22 are concentric. That is, the disc frame 31 is fixed on the pedestal 52 of the moving mechanism 5 so that the mounting surface 31 a of the disc frame 31 is orthogonal to the rotation center axis A of the drum shaft 22. The surface of the disc frame 31 on the drum 23 side is formed in a planar shape as a mounting surface 31a to which a plurality of diameter expanding means 32 are attached. Further, the disc frame 31 is formed with a plurality of long holes extending radially from the center of the mounting surface 31a. The long holes are formed at equal intervals (angles) in the circumferential direction of the mounting surface 31a, and are formed to have a length that allows the diameter of the annular tread 11 to be expanded. The long holes are not shown.

The diameter expanding means 32 includes a guide rail 34 arranged along the extending direction of the long hole, a moving body 35 that moves along the guide rail 34, and a link mechanism (not shown) that moves the moving body 35 in synchronization. Composed.
The guide rail 34 has a length substantially equal to the long hole, and is individually attached to the mounting surface 31a so as to straddle the long hole. A long hole corresponding to the long hole of the disc frame 31 is formed in the guide rail 34. That is, when the disk frame 31 is viewed from the attachment surface 31a side, the long hole of the disk frame 31 and the long hole of the guide rail 34 overlap each other. The moving body 35 is attached to the guide rail 34 and is movable along the extending direction of the guide rail 34. The moving body 35 is formed with a connection portion (not shown) connected to the link mechanism. When the connection portion is attached to the guide rail 34, the connection portion passes through the long hole of the disc frame 31 and the long hole of the guide rail 34, and is connected to the link mechanism on the back surface side of the attachment surface 31a. The link mechanism is attached to the back side of the attachment surface 31 a of the disc frame 31 and holds the moving body 35 concentrically with the center of the disc frame 31. For example, the link mechanism moves the moving body 35 inward and outward in the radial direction of the mounting surface 31a by transmitting the driving force of the servo motor to one element constituting the link.
In the illustration of this example, the guide rail 34 and the moving body 35 constituting the diameter expanding means 32 are shown as 10 sets. However, the number is not limited to this number, and may be 8 sets or 12 sets. Further, the moving body 35 is moved along the guide rail 34 by the link mechanism. However, the moving body 35 is moved by providing a driving source individually for the moving body 35 and driving each driving source in synchronization. Anyway.

3A shows a side view of the holding means 33, and FIG. 3B shows a plan view of the holding means 33.
The holding means 33 is configured by a holding claw 37 that has one end fixed to the moving body 35 and the other end extended so as to protrude from the mounting surface 31a to the drum 23 side.
The holding claw 37 is rotatable between the pair of long frames 39, 39 extending in parallel with the rotation center axis A of the drum 23 from above the moving body 35, and between the long frames 39, 39 at a predetermined interval along the extending direction. And a plurality of rollers 38 to be supported.
The long frames 39, 39 are formed to have a length sufficiently longer than the width of the annular tread 11, and a plurality of holding holes 39a for supporting the rotation shafts 38a of the plurality of rollers 38 are formed. Of the holding holes 39a, the holding hole 39a closest to the drum 23 is formed at a position where a part of the roller 38 to be attached is exposed from the front ends of the long frames 39 and 39. The center of the holding hole 39a is formed so as to be offset upward from the center line H in the thickness direction of the long frames 39, 39, and when the roller 38 is attached to the long frames 39, 39, A part is formed so as to be exposed from the upper surface of the long frames 39, 39.
Positioning markers 30 for holding the annular tread 11 in a predetermined position are provided on the side surfaces of the long frames 39 and 39. The positioning marker 30 is positioned so that the annular tread 11 stretched over each holding means 33 is uniformly spaced from the mounting surface 31a.
Therefore, the annular tread 11 spanned by the plurality of holding claws 37 is held without causing undulation in the circumferential direction, and the plurality of moving bodies 35 are along the guide rail 34 in the normal direction N of the mounting surface 31a. It is enlarged or reduced by moving (see FIG. 2A).

FIG. 4A shows a plan view of the pressing device 7, and FIG. 4B shows a side view of the pressing device 7.
The pressing device 7 prevents the annular tread 11 from being displaced with respect to the base tire 10 when the annular tread 11 is assembled to the base tire 10, and also prevents the annular tread 11 and the base tire 10 from being assembled. It is also used to increase adhesion.
The holding device 7 includes a moving mechanism 70 that can move from the base tire holding device 2 side to the tread diameter expanding device 3 side, a cylindrical annular frame 71 that is larger in diameter than the base tire 10, and a plurality of pressing means 72. It consists of.

The moving mechanism 70 includes a pair of linear motion mechanisms. A linear guide is applied to the linear motion mechanism in the same manner as the moving mechanism 5 of the tread diameter increasing device 3. The linear guide includes a linear linear rail 14A, a slider 14B that moves along the linear rail 14A, and a ball screw mechanism that is a drive mechanism for the slider 14B.
The linear rail 14A is disposed on the base 6 at a predetermined distance so as to be outside the linear rail 13A: 13A of the moving mechanism 5 and parallel to the linear rails 13A, 13A. A pedestal 74 on a flat plate for fixing the disc frame 31 is installed on the slider 14B: 14B. At least one of the linear guides is attached with a servo motor serving as a drive source for the ball screw mechanism. The servo motor is connected to the control device 9 and advances and retracts the pedestal 74 with respect to the drum 23 together with the sliders 14B: 14B based on the advance / retreat signal output from the control device 9.
The pressing means 72 includes, for example, a cylinder 76 that expands and contracts by driving a servo motor. The pressing means 72 is disposed so as to be even in the circumferential direction of the annular frame 71 and at the center in the width direction, and attached so that the expansion / contraction direction of the cylinder 76 corresponds to the normal line of the annular frame 71. Note that the attaching position of the pressing means 72 is attached while being displaced in the circumferential direction so as to be located in the middle of the plurality of holding means 33 described above.
When the annular tread 11 is assembled to the base tire 10, the cylinder 76 of the pressing device 7 is extended to press the annular tread 11 against the base tire 10, and the holding means 33 is connected to the annular tread 11 and the base tire 10. This prevents the annular tread 11 from being displaced and assembled with respect to the base tire 10 when being extracted from between the two. Further, when the base tire 10 is rotated so that the position where the holding means 33 holds the annular tread 11 and the pressing means 72 face each other, the annular tread 11 is held so as to be in close contact with the base tire 10. The means 33 presses the extracted position. Each pressing means 72 of the pressing device 7 is connected to the control device 9, and all the cylinders 76 expand and contract in synchronization with a signal output from the control device 9.
The pressing device 7 may be arranged on the same linear rail 13A as the moving mechanism 5.

FIG. 5 shows a side view of the break-in device 4.
The break-in device 4 includes a moving mechanism (not shown) that brings the break-in device 4 close to or away from the peripheral surface of the base tire 10, a device main body 41 disposed on the moving mechanism, and a stand from one side of the device main body 41. A pair of arms 42 and 42 projecting so as to face the peripheral surface of the tire 10, a roller 43 rotatably supported by the arms 42 and 42, and an upper surface of the apparatus main body 41 extending in the direction of the outer peripheral surface of the base tire 10. And measuring means 26 fixed to the supporting column 44. The moving mechanism moves the apparatus main body 41 in a direction orthogonal to the linear rail 14 </ b> A of the moving mechanism 70 that moves the pressing device 7.
The arms 42 and 42 protruding from the apparatus main body 41 face the outer peripheral surface 10a of the base tire 10 and move in the width direction and the radial direction of the base tire 10 by a drive mechanism (not shown) built in the apparatus main body 41. The roller 43 is rotatably supported by the arm 42 and is rotated by the contact between the outer peripheral surface of the roller 43 and the tread surface when the base tire 10 to which the annular tread 11 is assembled is rotated.
The drive mechanism (not shown) is connected to the control device 9 and presses the annular tread 11 while moving the roller 43 to the tire width so as to follow the tire surface based on the tire shape input to the control device 9. Force is controlled.
Therefore, the roller 43 rotates while being in contact with the annular tread 11, so that the annular tread 11 comes into close contact with the base tire 10 and the distortion inherent in the annular tread 11 is removed.

FIG. 6A is a plan view showing the relationship between the measuring means 26 for measuring the maximum radial dimension Rmax of the base tire 10 and the base tire 10, and FIG. 6B shows the maximum radial dimension Rmax of the base tire 10. 2 is a side view showing the relationship between the measuring means 26 and the base tire 10. FIG.
The measuring means 26 includes a non-contact sensor 27 and a sensor amplifier 28 that measure the distance to the object to be measured. The sensor 27 is attached to the tip of a support column 44 extending from the upper surface of the apparatus main body 41 to the upper side of the outer peripheral surface of the base tire 10.
As the sensor 27, for example, a one-dimensional laser sensor that irradiates the surface of the measurement target with a laser and measures the distance from the sensor 27 to the measurement target is applied. The sensor 27 is attached to the support column 44 so that the laser irradiation direction is directed toward the center of the drum 23 and the center of the base tire 10 mounted on the drum 23 is irradiated in the width direction. That is, the laser emitted from the sensor 27 is attached to the support column 44 so as to irradiate the tire equator region, which is the maximum diameter of the base tire 10 mounted on the drum 23. The sensor 27 is arranged at a predetermined distance so that the distance L from the rotation center axis A of the drum 23 to the sensor 27 is known.
Therefore, by irradiating the outer peripheral surface 10a of the base tire 10 with the laser from the sensor 27, the distance X from the outer peripheral surface 10a of the base tire 10 to the sensor 27 at the irradiation position can be measured. Then, by rotating the base tire 10 in a state where the laser is irradiated and subtracting the distance X from the distance L from the rotation center of the drum 23 to the sensor 27, the circumferential direction of the base tire 10 at the tire equator position is changed. The radius is calculated, and the maximum radius dimension Rmax is detected from the radius.
Note that the configuration of the measuring means 26 is not limited to the above configuration, and instead of a sensor that measures the distance by irradiating a laser, a contact sensor is provided so as to be able to contact and separate from the tire equator position, and the contact sensor is a base tire. The base tire 10 may be rotated in a state where it is in contact with the surface of the base 10, and the maximum radius dimension Rmax of the base tire 10 may be measured.

The control device 9 includes a storage unit 15, an arithmetic processing unit 16, and a control unit 17, and controls the assembly of the annular tread 11 and the base tire 10.
The control device 9 is, for example, a computer that executes software for controlling each means for assembling the annular tread 11 to the base tire 10, and includes a CPU as arithmetic processing means, ROM, RAM and HDD as storage means, communication It includes an interface as means, and operates based on a program stored in the storage means.
An operation panel for inputting dimensional information of the base tire 10 to be assembled and the annular tread 11 is connected to the control device 9, and information input from the operation panel is stored in the storage unit 15.

  The arithmetic processing unit 16 calculates the maximum radius dimension Rmax of the base tire 10 based on the distance X from the outer peripheral surface 10a of the base tire 10 to the sensor 27 measured by the sensor 27 of the measuring means 26, and the maximum radius dimension. Based on Rmax, the diameter D2 when the annular tread 11 is expanded is calculated.

In FIG. 7, the annular tread 11 is stretched over the plurality of holding means 33, and the diameter D1 of the virtual inscribed circle at the center W2 in the width direction of the annular tread 11 is twice the maximum radial dimension Rmax of the base tire 10. It is a conceptual diagram which defines the amount of sag E of the inner peripheral surface side edge 12 of the annular tread 11 generated between the holding means 33 adjacent to each other when the diameter is increased.
As shown in FIG. 7, the annular tread 11 is stretched over the plurality of holding means 33, and the diameter D1 of the virtual inscribed circle C1 at the center W2 in the width direction of the annular tread 11 is the maximum radial dimension Rmax of the base tire 10. In the state where the diameter is expanded to be twice that of the inner circumferential surface side edge 12 of the annular tread 11 between the holding means 33 adjacent to each other, “sag B” occurs. This “sag B” is directed to the inner side of the tire in the upper half of the annular tread 11 held by the holding means 33 and to the outer side of the tire in the lower half. In order to assemble to 10a, the diameter should be expanded so that at least the distance from the tip of "slack B" facing the inside of the tire to the center of the annular tread 11 is larger than twice the maximum radius dimension Rmax of the base tire 10. Thus, the outer peripheral surface 10a of the base tire 10 and the annular tread 11 can be assembled without being brought into contact with each other. Therefore, the arithmetic processing unit 16 adds the “sag amount E” having the largest amount of sag B to the measured diameter of the base tire 10 to a value obtained by doubling the maximum radius dimension Rmax of the base tire 10. The diameter D2 for expanding the annular tread 11 is set. The diameter D2 is the diameter D2 of the virtual inscribed circle C2 at the center W2 in the width direction of the annular tread 11.
The sagging amount E is experimentally acquired in advance and stored in the storage unit 15. In addition, since the sag amount E varies depending on the type of the annular tread 11, the “sag amount E” for each type of the annular tread 11 may be stored in the storage unit 15 in advance.

In addition, in the calculation of the diameter D2 for expanding the diameter of the annular tread 11, the arithmetic processing unit 16 determines that the increase rate of the diameter D2 of the virtual inscribed circle C2 at the center W2 in the width direction of the annular tread 11 is the circle before the diameter expansion. When the inner diameter of the annular tread 11 exceeds 12%, the operator is notified of an abnormal diameter expansion by an alarm or the like. Since the annular tread 11 does not return to the original size when the diameter of the annular tread 11 is increased by a certain ratio or more from the size of the natural state (before the diameter expansion), the arithmetic processing unit 16 expands the annular tread 11. The maximum diameter expansion diameter is set. The calculation processing unit 16 calculates information related to the size of the annular tread 11 input from the operation panel, specifically, 112% of the inner diameter of the annular tread 11 in a natural state, and calculates the size. It outputs to the memory | storage part 15 as a largest diameter expansion dimension.
By setting the size of expanding the annular tread 11 to 112% or less of the diameter before natural expansion (natural state), the annular tread 11 can maintain elastic deformation without plastic deformation. When the annular tread 11 is assembled to the base tire 10, the annular tread 11 is not assembled to the base tire 10 in a wavy state in the circumferential direction. The diameter expansion rate of 12% or less means that the inner diameter of the annular tread 11 is increased when the annular tread 11 is expanded by the holding means 33 and then the holding means 33 is reduced in diameter and released from the holding means 33. It is a numerical value experimentally confirmed to return to the diameter of the annular tread 11 before the diameter.

The control unit 17 controls the overall assembly of the annular tread 11 and the base tire 10. Hereinafter, assembly control by the control unit 17 will be described.
The control unit 17 outputs a holding signal to the expansion / contraction mechanism of the drum 23 based on the information of the annular tread 11 and the base tire 10 input from the operation panel by the operator so as to match the size of the base tire 10. Thus, the drum 23 is expanded in diameter and an internal pressure application signal is output to an air supply means (not shown) to supply air so that the internal pressure of the base tire 10 becomes a predetermined pressure.

  The control unit 17 outputs an outer diameter measurement signal for detecting the maximum radius dimension Rmax of the base tire 10 fixed to the drum 23 to the sensor 27, and outputs a rotation signal to the drum motor 24 to The rotation is performed to measure the maximum radius dimension Rmax, and the measurement data is output to the arithmetic processing unit 16. Further, after the holding means 33 is pulled out from between the base tire 10 and the annular tread 11 and the annular tread 11 is assembled to the base tire 10, the portion held by the holding means 33 of the annular tread 11 is pressed. A rotation signal for rotating the base tire 10 so as to face the means 72 is output to the drum motor 24.

The control unit 17 drives each moving body 35 of the diameter expanding means 32 so that the diameter of the virtual inscribed circle C2 at the center W2 in the width direction of the annular tread 11 becomes the diameter D2 calculated by the arithmetic processing unit 16. Outputs a diameter expansion signal to the servo motor. Further, when the annular tread 11 is assembled to the base tire 10, the diameter of the virtual inscribed circle C3 at the center W2 in the width direction of the annular tread 11 is the diameter D3 calculated by the arithmetic processing unit 16. A diameter reduction signal is output to the servo motor that drives each moving body 35 of the diameter expanding means 32.
The reduced diameter signal is output when the annular tread 11 is positioned so that the width direction center W1 of the base tire 10 and the width direction center W2 of the annular tread 11 coincide with each other, and the annular tread 11 is based on the signal. The holding claw 37 is moved so as to reduce the diameter of the tire, and the annular tread 11 is placed so as to surround the outer peripheral surface 10 a of the base tire 10.

  Further, the control unit 17 outputs an alignment signal, a separation signal, and a standby signal to the moving mechanism 5 of the tread diameter increasing device 3. The alignment signal is obtained by bringing the annular tread 11 held in the diameter-expanded state in the tread diameter increasing device 3 close to the base tire 10 held in the base tire holding device 2 and the width direction center W1 of the base tire 10. This signal is moved so that the center W2 in the width direction of the annular tread 11 coincides. The separation signal is output after placing the annular tread 11 on the outer peripheral surface 10a of the base tire 10 after the tread expanding device 3 has moved to a predetermined position (placement position) based on the alignment signal. It is a signal, and the tread diameter increasing device 3 is moved on the linear rail 13A: 13A so as to be separated from the drum 23 by the output of the signal.

  Further, the control unit 17 outputs a pressing signal to the pressing means 72 of the pressing device 7. After the diameter of the annular tread 11 is reduced, the hold-down signal extends the cylinder 76 when the tread expanding device 3 is separated from the annular tread 11 and the base tire 10 and the holding claw 37 is pulled out. This is a signal for pressing the annular tread 11 against the base tire 10 so that the annular tread 11 is not displaced relative to the base tire 10. Further, the control unit 17 pulls out the holding means 33 from between the base tire 10 and the annular tread 11, and the base tire 10 so that the part held by the holding means 33 of the annular tread 11 faces the pressing means 72. A pressing signal is output to the pressing means 72 even after the rotation of. That is, the pressing signal is a signal for preventing the annular tread 11 from being displaced with respect to the base tire 10 and a signal for bringing the annular tread 11 closer to the base tire 10.

  In addition, the control unit 17 outputs a break-in signal to the break-in device 4. The running-in signal is obtained by bringing the running-in device 4 into contact with the outer peripheral surface of the tire with the roller 43 on the tire in a state where the base tire 10 and the annular tread 11 are assembled, and moving in the width direction of the annular tread 11. This is a signal for pressing and fixing the annular tread 11 to the base tire 10.

FIG. 8 shows a flowchart of an assembling operation when the annular tread 11 is assembled to the base tire 10 using the tire manufacturing apparatus 1 of the present invention.
Assembling of the base tire 10 and the annular tread 11 is performed by setting the base tire 10 on the peripheral surface of the drum 23 and passing it around the plurality of holding claws 37 as the holding means 33 of the annular tread 11 by an operator. Starts from. In addition, the annular tread 11 is arranged so that the inner peripheral surface side end portion 12 is along the positioning marker 30 of each holding means 33.
Next, the operator inputs information such as the tire size of the base tire 10 and the type of the annular tread 11 from the operation panel. The control device 9 expands the diameter of the drum 23, outputs an internal pressure supply signal to an air supply means (not shown), supplies air to the pedestal tire 10 so as to have a predetermined pressure, and causes the pedestal tire 10 to be supplied to the drum 23 with an internal pressure. It fixes in the state which applied.

  Next, the drum 23 is rotated, and the sensor 27 of the measuring means 26 continuously scans the equator position of the base tire 10 along the circumferential direction to specify the maximum radius dimension Rmax at the equator position, and the maximum radius The dimension Rmax is calculated by the control device 9. And the diameter expansion dimension when expanding the annular tread 11 is calculated based on the maximum radius dimension Rmax of the base tire 10. That is, the diameter D2 of the virtual inscribed circle C2 at the center in the width direction of the annular tread 11 when the diameter of the annular tread 11 is expanded is calculated.

  Then, based on the diameter expansion signal from the control device 9, the annular tread 11 spanned on the holding claw 37 of the tread diameter increasing device 3 is a virtual inscribed circle at the center W <b> 2 in the width direction of the annular tread 11. All the moving bodies 35 are expanded in diameter by moving in the radial direction synchronously so that the diameter D2 of C2 becomes an expanded dimension.

When the setting of the base tire 10 with respect to the drum 23 and the holding of the annular tread 11 with respect to the holding claw 37 are completed by the above steps, the assembly operation of the annular tread 11 with respect to the base tire 10 is started by the following steps.
The annular tread 11 is moved in the direction in which the pressing device 7 and the tread diameter increasing device 3 are in proximity to the drum 23 of the table tire holding device 2 by an assembly signal output from the control device 9 to the moving mechanism 5. The annular tread 11 is disposed at a predetermined position so as to surround the periphery of the base tire 10 on the drum 23. Specifically, it is arranged such that the width direction center W2 of the annular tread 11 and the width direction center W1 of the base tire 10 coincide.

Next, the control device 9 outputs a pressing signal to the pressing means 72 of the pressing device 7 to extend the cylinder 76 and press the annular tread 11 against the outer peripheral surface 10 a of the base tire 10.
Next, the control device 9 outputs a separation signal to the moving mechanism 5, retracts the tread diameter expanding device 3, and pulls out the holding claw 37 from between the base tire 10 and the annular tread 11, whereby the annular tread. 11 is disposed on the outer peripheral surface 10 a of the base tire 10.
Next, the control device 9 outputs a pressing signal to the pressing device 7 after rotating the base tire 10 so that the portion held by the holding means 33 of the annular tread 11 faces the pressing means 72. The annular tread 11 is again pressed against the base tire 10 by the pressing means 72. Therefore, the annular tread 11 can be more closely attached to the base tire 10 by pressing the portion held by the holding means 33 again. Thereafter, a separation signal is output from the control device 9 to the moving mechanism 70, and the pressing device 7 is moved backward.

Next, when the assembly is completed, the control device 9 outputs a running-in signal to the running-in device 4 and moves the roller 43 in the tire width direction while rotating the tire a predetermined number of times while the roller 43 is in contact with the tread surface. Thus, the annular tread 11 is pressed so as to be adapted to the base tire 10.
The assembly of the annular tread 11 to the base tire 10 is completed through the above steps.

As described above, according to the tire manufacturing apparatus 1 of the present invention, the maximum radius dimension Rmax of the base tire 10 held by the base tire holding apparatus 2 is measured by the measuring means 26, and the maximum outer diameter dimension is circular. By expanding the annular tread 11 so that the diameter D2 is obtained by adding the amount of sag E generated in the tread 11, the annular tread 11 is attached to the base tire 10 when the annular tread 11 is assembled to the base tire 10. There is no contact with 10a. Further, since the maximum radial dimension Rmax is measured for each base tire 10 and the diameter of the annular tread 11 is increased so as to correspond to this, it is possible to prevent the annular tread 11 from being expanded more than necessary. In particular, the annular tread 11 used when rehabilitating a tire for an aircraft is formed with a thin tread end, so be careful when handling the tread end when the annular tread 11 is assembled to the base tire 10. However, by using the tire manufacturing apparatus 1 of the present invention, the annular tread 11 can be suitably assembled.
In the present embodiment, the measuring means 26 is provided in the break-in device 4, but it may be provided in the table tire holding device 2 and can measure the tire equator which is the maximum outer diameter of the table tire 10 fixed to the drum 23. Any of them may be provided.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the above embodiment.

1 tire manufacturing device, 2 tire holding device, 3 tread diameter expansion device,
4 running-in device, 5 moving mechanism, 6 base, 7 holding device, 9 control device,
10 tires, 11 annular tread, 12 inner peripheral side edge,
13A: 14A linear rail, 13B: 14B slider,
15 storage unit, 16 arithmetic processing unit, 17 control unit, 21 holding device body,
22 drum shafts, 23 drums, 24 drum motors,
26 measuring means, 27 sensors, 28 sensor amplifiers,
31 disc frame, 31a mounting surface, 32 diameter expanding means, 33 holding means,
34 guide rail, 35 moving body, 37 holding claw, 38 roller, 39 long frame,
40 belt, 41 device main body, 42 arm, 43 roller, 44 support pillar,
71 circular frame, 72 pressing means, 76 cylinders,
A rotation center axis, B sag, D1; D2; D3 diameter, E sag, F longitudinal direction,
L: X distance, N normal direction, Rmax maximum radius, W1; W2 width direction center.

Claims (4)

A tire manufacturing apparatus for assembling an annular tread on the outer peripheral surface of a base tire,
A base tire fixing means for fixing the base tire;
Measuring means for measuring the maximum outer diameter of the tire,
A plurality of holding means extending in the width direction of the annular tread and holding the inner peripheral surface of the annular tread;
A diameter expansion means for moving the holding means radially outward of the annular tread to expand the diameter of the annular tread;
The diameter of a virtual inscribed circle in contact with the inner peripheral surface of the annular tread held by the holding means is larger than the maximum outer diameter of the base tire measured by the measuring means, and the expanded annular shape A tire manufacturing apparatus comprising: control means for controlling the diameter-expanding means so as to reduce the diameter of the tread on the outer peripheral surface of the base tire.   The said control means controls the said diameter expansion means so that the increase rate of the diameter of the said virtual inscribed circle may be 12% or less with respect to the internal diameter of the annular | circular shaped tread before diameter expansion. Tire manufacturing equipment. A tire manufacturing method in which an annular tread is assembled to the outer peripheral surface of a base tire,
Measure the maximum outer diameter of the base tire fixed rotatably,
The inner circumferential surface of the annular tread is held by a plurality of holding means, the holding means is moved radially outward of the annular tread to expand the diameter of the annular tread,
The diameter of a virtual inscribed circle that is in contact with the inner peripheral surface of the annular tread held by the holding means is larger than the maximum outer diameter of the base tire, and the enlarged annular tread is formed on the base tire. A tire manufacturing method for reducing the diameter on the outer peripheral surface.   The tire manufacturing method according to claim 3, wherein the diameter of the virtual inscribed circle is expanded so that the increase rate of the diameter of the virtual inscribed circle is 12% or less with respect to the inner diameter of the circular tread before the expansion.

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