Tire bead separation device

Abstract

To provide a tire bead separation device which enables further reduction of a workload of a worker when a bead part of a tire is separated from a rim part of a wheel and enables the bead part to be easily separated from the rim part without fail.SOLUTION: A tire bead separation device includes: a rotary table 4 which detachably holds a lower rim part WR2 of a wheel attached with a tire T and rotationally drives the wheel around a vertical rotation axis L0; a bead guide member 5 which is inserted into a space between an upper rim part WR1 of the wheel and an upper bead part TB1 of the tire T to pull up the upper bead part TB1 to a position above the upper rim part WR1; a retainer 6 which retains the bead guide member 5 rotatably around a first axis L1 perpendicular to the rotation axis L0; a first cylinder CY1 which moves the retainer 6 along a second axis L2 parallel to the rotation axis L0; a second cylinder CY2 which is provided at the retainer and moves the bead guide member along the second axis L2; and a guide beam generation part which is provided at the retainer and emits a guide beam.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a tire bead separating device for separating a tire bead adhered to a rim portion of an automobile wheel from the rim portion.

Background Art

[0002] A conventional tire bead separating device is described, for example, in Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, in the operation of replacing a tire of an automobile, when separating the tire from the wheel, it takes time to position the tip of a bead guiding member for separating the bead portion of the tire from the rim portion of the wheel near the rim portion of the wheel. Therefore, there is a need for a tire bead separating device that can reduce the work burden on the operator and easily separate the bead portion from the rim portion.

[0005] An object of the present invention is to provide a tire bead separating device that can reduce the work burden on the operator and easily separate the bead portion of the tire from the rim portion of the wheel.

Means for Solving the Problems

[0006] The present invention includes a rotary table that detachably holds the lower rim portion of a wheel on which a tire is mounted and rotationally drives the wheel around a vertical rotation axis, A bead guide member that is inserted between the upper rim portion of the wheel and the upper bead portion of the tire and pulls up the upper bead portion onto the upper rim portion; A holder that rotatably holds the bead guide member about a first axis perpendicular to the rotation axis; A first cylinder that moves the holder along a second axis parallel to the rotation axis; A second cylinder that is provided on the holder and moves the bead guide member along a third axis parallel to the rotation axis; A tire bead separation device, characterized by including a guide beam light generation unit that is provided on the holder and emits guide beam light.

[0007] Further, the present invention is characterized in that the second cylinder is composed of a double-acting pneumatic cylinder having a piston rod and a locking mechanism for fixing the piston rod.

[0008] Further, the present invention is characterized in that the holder includes a swing arm that supports the bead guide member so as to be angularly displaceable about the first axis.

[0009] Further, the present invention is characterized by further including a bead roller that is disposed on the swing arm symmetrically with respect to the first axis with respect to the bead guide member and is rotatable about a fourth axis that inclines in a direction away from the first axis as it moves away from the rotation axis.

Advantages of the Invention

[0010] According to the present invention, the lower rim portion of the wheel with the tire mounted thereon is detachably held on the rotary table. The guiding beam light of the guiding beam light generating unit is emitted, for example, toward the rim portion of the wheel at the height position of the second cylinder. The operator visually recognizes the spot of the guiding beam light irradiated on the rim portion, and thereby can grasp the relative positional relationship between the spot and the tip of the bead guiding member visually. Therefore, the position of the tip of the bead guiding member by the second cylinder can be predicted based on the position of the spot. With the spot irradiated on the rim portion, the bead guiding member is lowered by a certain distance corresponding to the stroke of the first cylinder, for example, by the first cylinder, so that the tip of the bead guiding member is disposed near the rim portion of the bead portion, and the tip of the bead guiding member is inserted between the rim portion and the bead portion, and the bead guiding member can be hooked on the bead portion. Further, with the bead guiding member hooked on the bead portion, the bead guiding member is pulled up by a certain distance by the first cylinder, so that the bead portion is pulled up above the rim portion, and the wheel is rotated around the rotation axis by the rotary table, so that the bead portion is guided onto the upper rim portion and the upper bead portion of the tire is separated from the upper rim portion of the wheel. In such a bead separation operation, the operator can confirm the irradiation position of the guiding beam light so that the spot of the guiding beam light irradiates the rim portion by the second cylinder, and the tip of the bead guiding member can be positioned close to directly above the rim portion by the second cylinder. Therefore, the positioning operation of the bead guiding member can be simplified, the work load of the operator can be reduced, and the positioning operation of the bead guiding member can be facilitated.

[0011] Further, according to the present invention, since the second cylinder is provided with a locking mechanism, the piston rod can be fixed by the locking mechanism, and the displacement along the second axis of the piston rod can be blocked. Thereby, the tip of the bead guiding member can be inserted between the upper rim portion of the wheel and the upper bead portion of the tire, and the upper bead portion can be surely separated from the upper rim portion.

[0012] Also, according to the present invention, since the retainer includes a swing arm, the bead guide member can be angularly displaced about the first axis, and the bead guide member and other members, such as bead rollers, can be used selectively.

[0013] Further, according to the present invention, since the bead guide member and the bead roller are provided on the swing arm, the bead guide member is used when separating the bead portion from the rim portion, and the bead roller is used when mounting the tire T on the wheel W. Therefore, it becomes possible to easily distinguish between the bead guide member and the bead roller, and the tire changing operation can be assisted.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16A

Figure 16B

Figure 16C

Figure 16D

Figure 16E

Embodiments for Carrying Out the Invention

[0015] FIG. 1 is a front view showing a tire attaching / detaching device 2 including a tire bead separating device 1 according to an embodiment of the present invention, and FIG. 2 is a plan view of the tire attaching / detaching device 2. The tire attaching / detaching device 2 basically includes a base 53, a tire bead separating device 1, a bead portion guiding device A, and a mount press device C.

[0016] FIG. 3 is a front view of the tire bead separator 1 according to an embodiment of the present invention, FIG. 4 is a plan view of the tire bead separator 1, and FIG. 5 is a side view of the tire bead separator 1 as viewed from the left side in FIG. 4. In the present embodiment, a flat tire and an ultra-flat tire are assumed as the tire T, and the following description will be given. The tire bead separator 1 of the present embodiment is provided on a base 53. The tire bead separator 1 has a chuck portion 3 that detachably holds a lower rim portion WR2 of a wheel W on which a tire T having an upper bead portion TB1 and a lower bead portion TB2 in which a reinforcing material such as a metal wire is embedded is mounted, and rotates the wheel W in the direction of arrow B around a vertical rotation axis L0. A rotating table 4 for driving, a substantially S-shaped synthetic resin bead guide member 5 that guides the upper bead portion TB1 of the tire T in close contact with the upper rim portion WR1 of the wheel W from the upper rim portion WR1 above the upper rim portion WR1, and a bead guide member 5 are held rotatably around a first axis L1 perpendicular to the rotation axis L0. A holder 6, a first cylinder CY1 provided on the base 53 and moving the holder 6 along a second axis L2 parallel to the rotation axis L0, and a second cylinder CY2 provided on the holder 6 and moving the holder 6 along a third axis L3 parallel to the rotation axis L0 together with the bead guide member 5. A guide beam light generating portion 60 that emits guide beam light provided on the holder 6, and a bead press operation portion 70 that is provided on the holder 6 and is operated by an operator during the bead separation operation by the bead guide member 5 and the bead roller 10. The first cylinder CY1 is composed of, for example, a double-acting pneumatic cylinder. The second axis L2 and the third axis L3 are parallel to the rotation axis L0.

[0017] The holder 6 has a sixth cylinder CY6 for angularly displacing the bead guide member 5 around the axis of the pin 5a. The sixth cylinder CY6 is composed of, for example, a single-acting pneumatic cylinder. The holder 6 is fixed to one end of a shaft 68. The shaft 68 is supported by a slide bearing 69 so as to be movable in the axial direction.

[0018] The second cylinder CY2 consists of a double-acting pneumatic cylinder having a piston rod 7 and a locking mechanism 8 for fixing the piston rod 7. Since the second cylinder CY2 is provided with the locking mechanism 8, the piston rod 7 can be fixed by the locking mechanism 8, and displacement along the third axis L3 of the piston rod 7 can be prevented. As a result, a reaction force from the upper bead portion TB1 at the time of bead portion pressing acts on the bead guide member 5, and the piston rod 7 of the second cylinder CY2 is brought into a locked state in which movement along the third axis L3 is prevented, and displacement of the bead guide member 5 along the second axis L2 is prevented.

[0019] As shown in FIG. 16A described later, the bead guide member 5 is held by the holder 6 so as to be angularly displaceable by the pin 5a. Between the bead guide member 5 and the holder 6, the aforementioned sixth cylinder CY6 and the compression spring 5b are interposed. The bead guide member 5 is spring-biased in the direction of arrow A1 around the axis of the pin 5a with respect to the holder 6 by the spring force of the compression spring 5b. When inserting the tip of the bead guide member 5 between the upper bead portion TB1 and the upper rim portion WR1, the vicinity of the bead guide member 5 of the tire T is pressed by the pressing member 59 (see FIGS. 1 and 2) of the mounting press device C, and as shown in FIG. 16B, a gap is formed between the upper rim portion WR1 and the upper bead portion TB1, and the tip of the bead guide member 5 is angularly displaced in the direction of arrow A2 by the sixth cylinder CY6 so that the tip of the bead guide member 5 does not contact the upper rim portion WR1.

[0020] When inserting the tip of the bead guiding member 5 between the upper bead portion TB1 and the upper rim portion WR1, as described above, the pressing member 59 of the mounting press device C presses the sidewall of the tire T in the vicinity of the insertion position of the bead guiding member 5 so that the tip of the bead guiding member 5 does not contact the upper rim portion WR1. Further, when pulling up the bead guiding member 5, the sidewall on the side opposite to the insertion position of the bead guiding member 5 with respect to the rotation axis L0 is pressed by the pressing member 59 of the mounting press device C as shown by the arrow P in Fig. 16E, and the upper bead portion TB1 of this pressing portion is dropped to the drop portion of the wheel W. Thereby, the restraint of the pulling-up portion of the bead guiding member 5 of the upper bead portion TB1 can be relaxed.

[0021] The retainer 6 includes a swing arm 9 that supports the bead guiding member 5 so as to be angularly displaceable about the first axis L1 (see Fig. 3). The swing arm 9 is provided with a bead roller 10 that is arranged axially symmetrically with respect to the bead guiding member 5 with respect to the first axis L1 and is rotatable about a fourth axis L4 that is inclined in a direction away from the first axis L1 as it moves away from the rotation axis L0.

[0022] Fig. 6A is a cross-sectional view showing the lock mechanism 8 in the unlocked state, and Fig. 6B is a cross-sectional view showing the lock mechanism 8 in the locked state. The lock mechanism 8 includes a bottomed cylindrical cylinder case 11, a lid body 12 that airtightly closes the opening of the cylinder case 11, a brake metal member 13 housed in the cylinder case 11, and a piston 14 housed in the cylinder case 11. The cylinder case 11, the lid body 12, and the brake metal member 13 are made of steel. As shown in Fig. 3, the second cylinder CY2 has a cylinder case 25 and a piston rod 7 inserted through the cylinder case 25. The piston rod 7 penetrates the cylinder case 11 of the lock mechanism 8 in a direction perpendicular to the paper surface of Figs. 6A and 6B and is inserted into the brake metal member 13.

[0023] The brake metal member 13 has a substantially U-shaped cross-section perpendicular to the axis. Between the two free ends of the brake metal member 13, the plunger 18 of the piston 14 is inserted via a plurality of spherical rolling pieces 17. The plunger 18 is formed in a frustum of a cone shape. The rolling pieces 17 are made of, for example, steel spheres. The lock mechanism 8 has a pressure chamber 20 defined by the piston 14 and the lid body 12 in the space within the cylinder case 11. A threaded hole 21 is formed in the lid body 12, and a manual lock release bolt 22 is screwed into the threaded hole 21. The manual lock release bolt 22 has an engaging portion 23 also referred to as a wrench hole. A compressed air supply / exhaust port 30 is provided behind the manual lock release bolt 22 in FIG. 6A on the lid body 12, and compressed air can be supplied to the pressure chamber 20 through the compressed air supply hole of this compressed air supply / exhaust port 30, and the air within the pressure chamber 20 can be exhausted.

[0024] By engaging an engaging tool such as a hexagon wrench with the engaging portion 23 of the manual lock release bolt 22 and rotating it in one direction, the manual lock release bolt 22 is screwed out, the piston 14 is pushed down, the brake metal member 13 is pushed open by the plunger 18, and the locked state of the piston rod 7 can be manually released. Also, when compressed air is supplied to the pressure chamber 20 from the compressed air supply / exhaust port 30, the plunger 18 of the piston 14 is inserted into the opening of the brake metal member 13 via the rolling pieces 17, and the brake metal member 13 is pushed open as shown in FIG. 6A, and the locked state of the piston rod 7 is released.

[0025] When the compressed air within the pressure chamber 20 is exhausted from the compressed air supply / exhaust port 30, the piston 14 moves in the direction approaching the lid body 12 by the spring force of the compression spring 24. As a result, the plunger 18 moves in the direction of escaping from the opening of the brake metal member 13, and each free end of the brake metal member 13 is displaced in the direction of approaching each other, and the piston rod 7 is clamped by the brake metal member 13 and is put into a locked state.

[0026] The piston 14 has a disk-shaped main body portion 19, the aforementioned plunger 18 protruding from one main surface of the main body portion 19, and a recess 29 opening on the other main surface of the main body portion 19. The compressed air is supplied from a compressed air pressure source such as a compressed air supply device installed in the factory through pipelines such as compressed air supply pipes to the compressed air supply / exhaust port 30 of the aforementioned lock mechanism 8, the first cylinder CY1, the second cylinder CY2, the third cylinder CY3, the fourth cylinder CY4, the fifth cylinder CY5, and the sixth cylinder CY6, etc. respectively. Compressed air is supplied to the pressure chamber 20 through the compressed air supply / exhaust port 30.

[0027] In the lock mechanism 8, when compressed air is supplied to the pressure chamber 20 through the compressed air supply / exhaust port 30, the piston 14 is pressurized. The piston 14 moves in a direction away from the lid body 12 against the spring force of the compression spring 24 by the supply of compressed air to the compressed air supply / exhaust port 30, and the plunger 18 is inserted through the rolling piece 17, and the brake metal member 13 is pushed open as shown in FIG. 6A, and the locked state of the piston rod 7 is released. In this state, the piston rod 7 is movable along the third axis L3.

[0028] Also, when the supply of compressed air to the compressed air supply / exhaust port 30 is stopped, the compressed air is released to the atmosphere by the compressed air supply / exhaust port 30, and the inside of the pressure chamber 20 becomes atmospheric pressure. Therefore, the piston 14 moves in a direction approaching the lid body 12 by the spring force of the compression spring 24. As a result, the plunger 18 moves in a direction of escaping from the rolling piece 17, and each free end portion of the brake metal member 13 is displaced in a direction approaching each other, and the piston rod 7 is clamped by the brake metal member 13 and is set in a locked state.

[0029] In this way, since the piston rod 7 can be locked by the locking mechanism 8 or the locked state can be released, when the upper bead portion TB1 is separated by the bead guide member 5, the displacement of the piston rod 7 of the second cylinder CY2 along the third axis L3 can be blocked. As a result, the displacement of the bead guide member 5 is blocked, and the bead guide member 5 can be moved along the second axis L2 only by the first cylinder CY1.

[0030] Referring again to FIGS. 1 and 2, the rotary table 4 includes chuck means 40 for detachably holding a wheel W mounted coaxially with the rotation axis L0. The chuck means 40 has four chuck jaws 41 that are axially symmetric with respect to the rotation axis L0, and each chuck jaw 41 is mounted on a slider 43 and is displacement-driven in directions approaching and separating from each other by a third cylinder CY3 composed of a double-acting pneumatic cylinder. These chuck jaws 41 can sandwich the lower rim portion WR2 of the mounted wheel W from the radially outer side and hold the wheel W on the same axis as the rotation axis L0. Further, when each chuck jaw 41 is displaced in a direction separating from each other, the clamping state of the wheel W is released, and the operator can remove the wheel W from the rotary table 4.

[0031] The bead portion guiding device A is provided on the base 53. When the tire T is so hard that the bead portion TB cannot be separated from the rim portion WR, the bead portion guiding device A is not used, and the tire bead separating device 1 is used.

[0032] Referring to FIGS. 1 and 2, the bead portion guiding device A includes a lifting arm 55 provided so as to be displaceable in the upward and downward directions, a bead guide 56 provided at the lower end portion of the lifting arm 55, a horizontal arm 57 that holds the lifting arm 55 and is displaceable in the front-rear direction approaching / separating from the rotation axis L0, and a support column 58.

[0033] The bead guide 56 is detachably attached to the lower end of the lifting arm 55 by bolts or the like, and supports the upper bead portion TB1 from below in a state of being engaged with the upper rim portion WR1 of the wheel W mounted on the rotary table 4. By the rotation of the tire T and the wheel W, the upper bead portion TB1 is guided above the upper rim portion WR1 and is used to separate the upper bead portion TB1 from the upper rim portion WR1. The bead guide 56 is made of synthetic resin to prevent damage caused by contact with the tire T. When the upper bead portion TB1 is guided onto the upper rim portion WR1 by the bead guide 56, the portion of the sidewall of the tire T on the opposite side of the engagement position of the bead guide 56 from the rotation axis L0 (the position of the arrow P in FIG. 16E described above) is pressed by the pressing member 59 of the mounting press device C, so that the tire T is inclined obliquely with respect to the wheel W, and the inner diameter of the upper bead portion TB1 is smaller than the outer diameter of the upper rim portion WR1, facilitating the escape of the upper bead portion TB1 from the upper rim portion WR1.

[0034] The mounting press device C is provided on the base 53. The mounting press device C includes a support column 81, a fourth cylinder CY4 composed of a double-acting pneumatic cylinder, an arm 82 that is driven to move up and down along the support column 81 by the fourth cylinder CY4, and a mounting press operation unit 62 for an operator to operate when performing the tire detachment operation. The arm 82 has a first arm 82a, a second arm 82b, and a third arm 82c. A pressing member 59 made of synthetic resin is provided at the tip of the third arm 82c. The mounting press operation unit 62 is provided on the second arm 82b.

[0035] Referring to FIG. 1, below the tire bead separating device 1, on one side of the base 53, a bead breaker section 50 is provided for an operator to carry in a tire T of a passenger car in an upright state and separate each bead section TB from each rim section WR of the wheel W. The bead breaker section 50 includes a blade 54 for pressing the bead section TB of the upright tire T from the side, a support member 61 rising from the blade 54, a bead breaker operation section 80 provided at the upper end of the support member 61 and operated by the operator, and a fifth cylinder CY5 composed of a double-acting pneumatic cylinder for driving the blade 54.

[0036] The bead breaker operation section 80 is operated by the operator when the bead breaker section 50 separates the upper bead section TB1 of the tire T from the upper rim section WR1 of the wheel W of the passenger car and separates the lower bead section TB2 from the lower rim section WR2.

[0037] On the base 53, there is a strut tilting pedal Ps for operating the tilting and inversion of the strut 28, a chucking pedal Pc for opening and closing the slider 43 to fix and release the wheel W, and the blade 54 of the bead breaker section 50 can be displaced in the bead pressing direction, that is, in the direction approaching the base 53, to press the bead section TB1 and peel the bead section TB1 from the upper rim section WR1 to eliminate the close contact state.

[0038] FIG. 7 is a front view showing the mount press operation unit 62, FIG. 8 is a side view of the mount press operation unit 62 as viewed from the left side of FIG. 7, and FIG. 9 is a plan view of the mount press operation unit 62 as viewed from above FIG. 8. The mount press operation unit 62 includes a housing 63, an irradiation start button 64 provided on the housing 63 for starting the irradiation of the guide beam light to the guide beam light generation unit 60 (see FIG. 3), an irradiation stop button 65 provided on the housing 63 for stopping the irradiation of the guide beam light, and an automatic operation start button 66. An operation lever 67 is fixed to one side wall of the housing 63. The guide beam light generation unit 60 may include, for example, a laser diode (LD) and may be configured to emit a green laser beam with a spot diameter of about 4 to 6 mm as the guide beam light. When the green laser beam irradiates the upper rim portion WR1 of the wheel W, the operator can clearly recognize the spot, and can easily and clearly recognize the irradiation position.

[0039] When performing the operation of separating the upper bead portion TB1 from the upper rim portion WR1 by the bead guide member 5, the operator moves the tip portions of the first cylinder CY1 and the bead guide member 5 by the second cylinder CY2 to a position where the laser spot of the laser beam of the guide beam light generation unit 60 irradiates a predetermined position on the upper rim portion WR1. The stroke of this first cylinder CY1 is constant. Therefore, the bead guide member 5 can be lifted and lowered by a fixed distance corresponding to the stroke by the first cylinder CY1 with reference to the height position of the bead guide member 5 determined by the second cylinder CY2. As a result, the position where the bead guide member 5 is lowered to the lower limit position by the first cylinder CY1 becomes the insertion start position between the upper bead portion TB1 and the upper rim portion WR1, and the insertion start position of the tip portion of the bead guide member 5 is positioned. By thus lowering the bead guide member 5 by a fixed distance corresponding to the stroke of the first cylinder CY1, the tip portion of the bead guide member 5 can be arranged in the vicinity of the upper bead portion TB1 and the rim portion WR1.

[0040] Next, the pressing member 59 of the mounting press device C presses the upper bead portion TB1 near the tip of the bead guide member 5, forming a gap between the upper bead portion TB1 and the upper rim portion WR1. After that, when the operator presses the automatic operation start button 66, the tip of the bead guide member 5 is inserted into the gap between the upper rim portion WR1 and the upper bead portion TB1, and the bead guide member 5 descends until the bead portion TB1 is latched onto the bead guide member 5. Then, the bead guide member 5 rises, and the upper bead portion TB1 is pulled up onto the upper rim portion WR1, causing the upper bead portion TB1 to be disengaged from the upper rim portion WR1. In this way, with the bead guide member 5 latched onto the upper bead portion TB1, the bead guide member 5 is pulled up by a certain distance by the first cylinder CY1, pulling the upper bead portion TB1 above the upper rim portion WR1, and rotating the wheel around the axis of rotation by the rotating table, guiding the upper bead portion TB1 onto the upper rim portion WR1, and separating the upper bead portion TB1 of the tire T from the upper rim portion WR1 of the wheel W. In this way, the process until the upper bead portion TB1 is disengaged from the upper rim portion WR1 is automatically executed. When performing such a bead separation operation automatically, after the tip of the bead guide member 5 is inserted into the gap between the upper rim portion WR1 and the upper bead portion TB1, the pressing member 59 of the mounting press device C is manually raised from the tire T and retracted to a position where it does not interfere with the movement of the bead guide member 5.

[0041] FIG. 10 is a front view showing the bead press operation unit 70, FIG. 11 is a side view of the bead press operation unit 70 as viewed from the left side of FIG. 10, and FIG. 12 is a plan view of the bead press operation unit 70 as viewed from above FIG. 10. The bead press operation unit 70 includes a housing 78, a bead press up and down switch 72, a bead up and down switch 73, a head lock switch 74, a cream injection switch 75, a bead up lock switch 76, and a head lock down switch 77.

[0042] The bead press up / down switch 72 consists of an operating lever switch. When the operator makes a angular displacement operation upward, the piston rod 7 of the second cylinder CY2 can be extended along the third axis L3, and the holder 6 can be lifted. Also, when the operator makes a angular displacement operation downward on the bead press up / down switch 72, the piston rod 7 of the second cylinder CY2 can be retracted along the third axis L3, and the holder 6 can be lowered. When the bead press up / down switch 72 is not operated and is in the neutral state, the locking mechanism 8 operates, the holder 6 is locked, and the up / down displacement is blocked.

[0043] The bead up / down switch 73 consists of an operating lever switch. When the operator makes a angular displacement operation upward, the demounting roller 51 can be lifted, and when the operator makes a angular displacement operation downward, the demounting roller 51 can be lowered.

[0044] The head lock switch 74 is a lock state changeover switch for making the displacement in the axial direction of the shaft 68 to which the holder 6 is fixed in the unlocked state and making the shaft 68 movable in the axial direction. Thereby, the holder 6 can be made movable in the direction of the axis L1. Accordingly, the bead guide member 5 and the bead roller 10 can be displaced in the direction of the axis L1, and as shown in FIG. 16A, the bead guide member 5 can be moved in the directions of the arrows B1, B2. Also, when the operator switches the head lock switch 74 to the locked state, the sixth cylinder CY6 is retracted, and as shown in FIG. 16B, the tip of the bead guide member 5 can be moved in the directions of the arrows A1, A2 so as to be positioned in the vicinity directly above the rim WR1.

[0045] The cream injection switch 75 consists of a button switch. When the operator makes a pressing operation, a lubricant also called liquid bead cream can be sprayed from the nozzle onto the upper bead portion TB1 of the tire T mounted on the rotary table 4.

[0046] The bead-up lock switch 76 is a switch for locking the displacement of the demount roller 51 (see FIG. 1) in the front-rear direction.

[0047] The head-lock lowering switch 77 is a switch for extending the piston rod of the first cylinder CY1 to lower the bead guide member 5.

[0048] FIG. 13 is a front view showing the bead breaker operation unit 80, FIG. 14 is a side view of the bead breaker operation unit 80 as viewed from the left side of FIG. 13, and FIG. 15 is a plan view of the bead breaker operation unit 80 as viewed from above FIG. 13. The bead breaker operation unit 80 includes a housing 84, a first operation unit 85 provided on the housing 84, a second operation unit 86 provided on the housing 84, and a handle 87 provided on the housing 84. The first operation unit 85 is operated by an operator when pressing the bead portion TB with the blade 54 in a depressurized state in order to suppress a large impact caused by the bead portion TB suddenly detaching from the rim portion WR when the operator obtains a feeling that the bead portion TB can detach from the rim portion WR. The second operation unit 86 is an operation lever that the operator angularly displaces in the "extend" direction (one direction) when separating the blade 54 from the bead portion TB, and the operator angularly displaces in the "contract" direction (the other direction) when pressing the bead portion TB with the blade 54.

[0049] FIG. 16A is a cross-sectional view showing a state in which the guide beam light is emitted from the guide beam light generation unit 60, FIG. 16B is a cross-sectional view showing a state in which the bead guide member 5 is manually pulled out, and FIG. 16C is a cross-sectional view showing a state in which the height of the bead guide member 5 is adjusted by the second cylinder CY2 so that the guide beam light is irradiated on the upper rim portion WR1. FIG. 16D is a cross-sectional view showing a state in which the bead guide member 5 has descended by the stroke of the first cylinder CY1, and FIG. 16E is a cross-sectional view showing a state in which the upper bead portion TB1 is pulled up onto the upper rim portion WR1 by the bead guide member 5.

[0050] With reference to FIGS. 16A to 16E, the operation of pulling out the upper bead portion TB1 above the upper rim portion WR1 of the wheel W will be described. When removing the tire T from the wheel W, the operator presses the irradiation start button 64 (see FIG. 7) of the mount press operation unit 62, and as shown in FIG. 16A, the guide beam light generating unit 60 irradiates the upper bead portion WB1 or the upper rim portion WR1 with the guide beam light.

[0051] As shown in FIG. 16B, the operator moves the bead guide member 5 in front of the upper rim portion WR1, and as shown in FIG. 16C, adjusts the upper rim portion WR1 to the height position irradiated with the beam light by the second cylinder CY2, and manually performs the work until the automatic operation start button 66 is pressed. As shown in FIG. 16D, the first cylinder CY1 automatically descends by a certain stroke to insert the bead guide member 5 between the upper rim portion WR1 and the upper bead portion TB1. As shown in FIG. 16E, the operation until the upper bead portion TB1 is hooked and pulled up onto the upper rim portion WR1 is executed.

[0052] As described above, by simply positioning the irradiation position of the laser spot of the guide beam light so that the tip of the bead guide member 5 is located on the upper rim portion WR1, the tip of the bead guide member 5 always moves by a fixed stroke length determined by the first cylinder CY1. Therefore, the bead separation operation of pulling up the upper bead portion TB1 onto the upper rim portion WR1 can be smoothly executed. As a result, even when removing the tire T which is a plurality of wheels with mounted tires, the positioning work of the operator can be facilitated and the work burden of the operator can be reduced.

[0053] Therefore, the labor of positioning the tip of the bead guide member 5 in the vicinity of the upper rim portion WR1 is simplified, and without contacting the tip of the bead guide member 5 with the upper rim portion WR1, the tip of the bead guide member 5 is inserted between the upper rim portion WR1 and the upper bead portion TB1, the upper bead portion TB1 is hooked on the bead guide member 5, and by retracting the first cylinder CY1, the upper bead portion TB1 can be easily separated from the upper rim portion WR1.

[0054] Next, as shown in FIG. 16C, the bead guide member 5 is positioned by adjusting the height of the tip of the bead guide member 5 so that the upper rim portion WR1 is irradiated with a laser spot by the second cylinder CY2, and is lowered. By inserting the tip of the bead guide member 5 between the upper rim portion WR1 and the bead portion TB1, the bead portion TB1 is hooked on the bead guide member 5. As shown in FIG. 16C, the bead guide member 5 is raised by the first cylinder CY1, so that the bead portion TB1 is pulled out above the upper rim portion WR1. In this state, by rotating the rotary table 4 around the rotation axis L0, the bead portion TB1 can be detached above the upper rim portion WR1.

[0055] According to the present invention, the lower rim portion WR2 of the wheel W on which the tire T is mounted is detachably held by the chuck means 40 on the rotary table 4. The rotary table 4 rotationally drives the held wheel W around the vertical rotation axis L0. The bead guide member 5 is inserted between the upper bead portion TB1 of the tire T and the upper rim portion WR1 of the wheel W, separates the upper bead portion TB1 from the upper rim portion WR1, and rotates the wheel W around the rotation axis L0 by the rotary table 4, so that the upper bead portion TB1 is guided onto the upper rim portion WR1, and the upper bead portion TB1 of the tire T is separated from the upper rim portion WR1 of the wheel.

[0056] In such a bead separation operation, the bead guide member 5 is moved by the second cylinder CY2 so that the irradiation position of the guiding beam light is located on the upper rim portion WR1. After the bead guide member 5 is lowered by a certain distance by the first cylinder CY1 and then raised, the upper bead portion TB1 can be pulled up onto the upper rim portion WR1 and the upper bead portion TB1 can be removed from the upper rim portion WR1. When the wheel W is rotated around the rotation axis L0 by the rotary table 4 with the upper bead portion TB1 detached from the upper rim portion WR1, the entire circumference of the upper bead portion TB1 is guided above the upper rim portion WR1 by the bead guide member 5, and the upper bead portion TB1 is separated from the upper rim portion WR1.

[0057] In this way, by the first cylinder CY1, the bead guiding member 5 is driven, and the tip of the bead guiding member 5 is inserted between the upper bead portion TB1 and the upper rim portion WR1, separating the upper bead portion TB1 from the upper rim portion WR1, and the upper bead portion TB1 can be surely separated from the upper rim portion WR1. Therefore, the positioning work of the bead guiding member 5 by the operator is facilitated, and the work load of the operator can be further reduced.

[0058] Further, according to the present invention, since the second cylinder CY2 is provided with a locking mechanism, the piston rod can be fixed by the locking mechanism, and the displacement along the second axis L2 of the first cylinder can be blocked. Thereby, when the bead guiding member is inserted, the piston rod of the second cylinder CY2 is blocked from displacing along the first axis L1 by the reaction force from the upper bead portion TB1 to the bead guiding member 5. Therefore, the bead guiding member 5 is prevented from being displaced by the reaction force from the upper bead portion TB1, and the tip of the bead guiding member 5 is inserted between the upper bead portion TB1 and the upper rim portion WR1, pulled up and separated from the upper bead portion TB1 from the upper rim portion WR1, and the upper bead portion TB1 in close contact with the upper rim portion WR1 can be surely separated.

[0059] Further, according to the present invention, since the retainer 6 is provided with a swing arm, the bead guiding member 5 can be angularly displaced around the first axis, and the bead guiding member 5 and other members, for example, the bead roller, can be used properly.

[0060] Further, according to the present invention, since the bead guiding member 5 and the bead roller 10 are provided on the swing arm 9, when separating the upper bead portion TB1 from the upper rim portion WR1, the bead guiding member 5 is used, and when mounting the tire T on the wheel W, the bead roller 10 is used. Therefore, it is possible to easily use the bead guiding member 5 and the bead roller 10 properly, and the switching between the separation work of the tire T from the wheel W and the mounting work of the tire T on the wheel W is facilitated.

[0061] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various changes, improvements, etc. are possible without departing from the gist of the present invention. Needless to say, all or part of each of the above embodiments can be combined as appropriate within a non-contradictory range.

Explanation of Reference Numerals

[0062] 1 Tire bead separator 2 Tire attaching / detaching device 3 Chuck part 4 Rotating table 5 Bead guide member 6 Fixture 7 Piston rod 8 Lock mechanism 9 Swing arm 10 Bead roller CY1 First cylinder CY2 Second cylinder CY3 Third cylinder CY4 Fourth cylinder CY5 Fifth cylinder CY6 Sixth cylinder L0 Axis of rotation L1 First axis L3 Third axis T Tire TB1 Upper bead part W Wheel WR2 Lower rim part WR1 Upper rim part

Claims

1. A rotary table that removably holds the lower rim portion of a wheel with a tire mounted thereon and rotationally drives the wheel about a vertical axis of rotation; A bead guide member that is inserted between the upper rim portion of the wheel and the upper bead portion of the tire and pulls up the upper bead portion onto the upper rim portion; A holder that rotatably holds the bead guide member about a first axis perpendicular to the axis of rotation; A first cylinder that moves the holder along a second axis parallel to the axis of rotation; A second cylinder that is provided on the holder and moves the bead guide member along a third axis parallel to the second axis; A tire bead separation device, comprising: a guide beam light generation unit that is provided on the holder and emits guide beam light.

2. The tire bead separation device according to claim 1, wherein the second cylinder comprises a double-acting pneumatic cylinder having a piston rod and a locking mechanism for fixing the piston rod.

3. The tire bead separation device according to claim 1 or 2, wherein the holder comprises a swing arm that supports the bead guide member so as to be angularly displaceable about the first axis.

4. The tire bead separation device according to claim 3, further comprising a bead roller that is disposed on the swing arm symmetrically with respect to the first axis with respect to the bead guide member and is rotatable about a fourth axis that is inclined in a direction away from the first axis as it moves away from the axis of rotation.

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