Tire conveyor

Abstract

A tire conveying device comprising: a plurality of tire gripping units (17A, 17B) arranged along a conveying direction of a tire (W), each of which is designed to grip the tire (W) from an outer circumferential side or an inner circumferential side of the tire (W); and a drive unit for moving the plurality of tire gripping units (17A, 17B) in the conveying direction; the drive unit being designed to move the tire gripping unit (17A) on an upstream side of the conveying direction and the tire gripping unit (17B) on a downstream side of the conveying direction, each gripping the tire (W), together to the downstream side of the conveying direction, characterized in that the drive unit comprises a movable table (26) for moving the tire gripping units (17A, 17B) in the conveying direction, and the movable table (26) being designed to move along a path of motion.which is arranged on one or both sides of a conveyor track of the tire (W), wherein the path of movement is formed by a rail (18) extending along the conveyor track of the tire (W), and the table (26) moves along the rail (18) with the tire gripping units (17A, 17B) attached thereto; wherein each of the tire gripping units (17A, 17B) is configured to grip the tire (W) in a horizontal arrangement either from both outer circumferential sides of the tire (W) or from one inner circumferential side of the tire (W) such that the inner circumference of the tire is increased, and the drive unit is configured to move the tire gripping units (17A, 17B) simultaneously along the conveying direction on the upstream and downstream sides of the conveying direction, wherein a receiving stage (1) in which the tire (W) is received, a measuring stage (2) in which an imbalance of the tire (W) is measured,and a marking stage (3), in which a marking is printed on the tire (W), is provided along the conveying path of the tire (W), and these stages (1, 2, 3) are arranged at equal intervals from each other along the conveying direction, and the drive unit is designed such that it synchronously moves the plurality of tire gripping units (17A, 17B) along the conveying direction with a stroke corresponding to the interval and thereby moves the tire (W) from an upstream side to a downstream side along the conveying direction.

Description

TECHNICAL AREA

[0001] The present invention relates to tire conveying devices, which are used, for example, in tire production lines for conveying tires. STATE OF THE ART

[0002] Up to now, tire conveyors have typically been used as tire conveying devices in tire production lines, an example of which is disclosed in patent document 1. The tire conveying device disclosed in this document conveys a tire mounted on a conveyor by rotating a group of rollers. DOCUMENT AS STATE OF THE TECHNOLOGY PATENT DOCUMENT

[0003] Patent document 1: Japanese patent publication 2000-329658 SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION

[0004] When the rotational speed of the rollers in these conventional roller conveyors is increased to convey a tire at higher speeds, the rollers often slip relative to the tire. When such slippage occurs, the conveying speed of the tire is highly likely to become uneven and / or the conveying direction of the tire will change. To avoid these problems, the tire must necessarily be conveyed at lower speeds.

[0005] In conventional tire testing systems used to test tire imbalance, a number of processing stages are arranged along the tire conveyor, and centering the tires is a necessary step each time the tire is conveyed to one of these stages. Centering requires a specific amount of time, in addition to the time needed to move the tires along the conveyor.

[0006] Furthermore, it is necessary to convey the next tire to the processing stage after a tire currently in the conveying stage has been conveyed to the next processing stage. It is therefore not possible to convey the tires to and from the processing stages simultaneously. Consequently, a time delay is unavoidable when a tire is conveyed to a processing stage after another tire currently in the processing stage has been conveyed out.

[0007] Conventional tire conveyors therefore have disadvantages, namely the additional time required for centering and the unavoidable time delay in tire conveying. These disadvantages are obstacles to reducing test time in tire testing systems.

[0008] In tire testing systems, a tire that has been measured as having an imbalance at a measuring stage and is being conveyed to a marking stage by the roller conveyor may rotate, changing its circumferential position. In this case, the measured imbalance position of the tire changes, leading to an error in determining the correct marking position at the marking stage.

[0009] The present invention is intended to solve these problems. A primary objective of the present invention is to reduce the time required to transport a tire. A further objective of the present invention is to reduce the testing time in tire testing systems. MEANS TO SOLVENT THE PROBLEM

[0010] The present invention aims to solve the above-mentioned problems by means of a tire conveying device with the following features. 1) A tire conveying device according to the present invention comprises: a plurality of tire gripping units arranged along a conveying direction of a tire, each of which serves to grip the tire from an outer circumferential side or an inner circumferential side of the tire; and a drive unit for moving the plurality of tire gripping units in the conveying direction, which drive unit moves the tire gripping unit on an upstream side of the conveying direction and the tire gripping unit on a downstream side of the conveying direction, each gripping the tire, together to the downstream side of the conveying direction.

[0011] In the tire conveyor according to the invention, the tire gripping units each grasp a tire from an outer or inner circumferential side, and the tire gripping units, which thus grip the tires, are moved in the conveying direction. The tire conveyor, characterized in this way, eliminates the risk of a problem occurring in conventional tire conveyors, namely the slippage of rollers relative to the tire, which leads to high speeds during tire conveying. The tire conveyor also eliminates the risk of unintentional rotation of the tire during conveying, thus preventing any displacement of the tire's circumferential position.

[0012] If the tire is simply gripped by the tire gripping units from either an outer or inner circumferential side, it can be centered and then conveyed to the next processing stage. This eliminates the need for tire centering in the subsequent processing stage. Due to this technical advantage and the avoidance of the risk of misalignment caused by rotation, as described previously, the tire can be immediately subjected to the following process.

[0013] The tire gripping units on the upstream and downstream sides of the tire conveying direction, each gripping a tire, are moved together to the downstream side. Thus, the tires gripped by the upstream and downstream tire gripping units can be conveyed simultaneously to the downstream side. For example, if a tire in the device described herein, currently in a processing stage, is conveyed to the next processing stage by the downstream tire gripping unit, a subsequent tire can be conveyed to the processing stage simultaneously by the upstream tire gripping unit. In this way, the tires can be conveyed sequentially to the processing stages arranged along the conveying direction.This technical advantage also reduces processing time in tire testing systems equipped with multiple processing stages. 2) In the tire conveying device according to a preferred aspect of the invention, the drive unit comprises a movable body for moving the tire gripping units along the tire conveying device, wherein the movable body moves along a path of movement which is arranged on one side or on both sides of a conveying path of the tire.

[0014] According to a preferred aspect, a motion mechanism comprising the motion path and the moving body for moving the tire gripping units is arranged on one or both sides of the tire conveyor. This leaves free space in the upper direction of the tire conveyor. This space can be used as an area in which tire handling devices, such as a lifting machine and a marking device, are provided. The lifting machine moves an upper edge up and down away from and toward a tire that is positioned on the lower edge of a measuring device for measuring the tire's imbalance. The marking device comprises a marking head that is movable up and down for imprinting an imbalance measurement result onto the tire. 3) In the tire conveying device according to the preferred aspect described in 2), the path of movement can be formed by a rail extending along the conveying path of the tire, and the moving body can be a movable table moving along the rail with the tire gripping units attached to it.

[0015] According to a further preferred aspect, the tire gripping units are mounted on and supported by a movable table, which moves along a rail arranged on one or both sides of the tire conveyor, and are then moved in the direction of tire conveying. This leaves a free space in the upper direction of the tire conveyor. Within this space, the upward and downward movements of a marking device for moving a marking head and a lifting device for moving an upper edge are not obstructed. 4) In the tire conveying device according to a further preferred aspect of the invention, the tire gripping units grip the tire in a horizontal arrangement from both outer circumferential sides of the tire, and the drive unit moves the tire gripping units on the upstream and downstream sides of the conveying direction simultaneously in the conveying direction.

[0016] According to this preferred aspect, when the tire gripping unit grips the tire in a horizontal arrangement by clamping it from both outer circumferential sides, it also continues to center the tire. Furthermore, the drive unit moves the tire gripping units on the upstream and downstream sides of the conveying direction simultaneously in the conveying direction. In the tire conveying device characterized by this, while a tire currently in a conveying stage is being conveyed to the next processing stage by the downstream tire gripping unit, a next tire can simultaneously be conveyed to this processing stage by the upstream tire gripping unit. 5) In the tire conveying device according to yet another preferred aspect of the present invention, the tire gripping units each grip the tire in a horizontal arrangement in such a way that the inner diameter of the tire is increased, and the drive unit moves the tire gripping units on the upstream and downstream sides of the conveying direction simultaneously in the conveying direction.

[0017] According to this preferred aspect, when the tire gripping unit grips the tire in a horizontal arrangement in such a way as to increase the inner circumference of the tire, it also continues to center the tire. Furthermore, the drive unit moves the tire gripping units on the upstream and downstream sides of the conveying direction simultaneously in the conveying direction. In the device characterized by this, while a tire currently in a processing stage is being conveyed by the downstream tire gripping unit into a subsequent processing stage, a subsequent tire can simultaneously be conveyed by the upstream tire gripping unit into this processing stage. 6) In the tire conveying device according to the preferred aspect described in 4), the tire gripping units each have tire grippers facing each other, which tire grippers can move towards and away from each other and can move upwards and downwards, and the tire grippers move towards each other and grip the tire in such a way that the tire is clamped from both sides.

[0018] According to this preferred design, the tire grippers, facing each other, move back and forth against each other, gripping the tire in such a way that it is clamped from both sides. This allows the tire to be easily and securely adjusted in its position relative to the center of the tire grippers, thus centering the tire.

[0019] The tire grippers are movable both upwards and downwards. When the tire grippers, which hold the tire between them, are moved upwards, the tire can be lifted onto a roller conveyor and then transported. This allows for high speeds in tire transport. 7) In the tire conveying device according to the preferred aspect described in 4), the tire gripping unit each has tire grippers which move towards and away from each other in a horizontal direction in a reciprocating motion and are movable upwards and downwards, wherein the tire grippers move towards each other in a reciprocating motion and grip the tire in such a way that the tire is clamped from both sides.

[0020] If, according to this preferred aspect, the tire grippers move back and forth towards each other in order to grip the tire in such a way that the tire is clamped from both sides, the tire can be adjusted in its position to the middle between the tire grippers (centering).

[0021] The tire grippers are movable both upwards and downwards. When the tire grippers move upwards with the tire gripped between them, the tire can be perfectly lifted upwards on a roller conveyor and then transported. This enables high speeds in tire transport. 8) In the tire conveying device according to the preferred aspect described above in 5), the tire gripping units each have a tire gripper which is movable upwards and downwards and can be drawn into and out of a hole in the tire from above, wherein the tire gripper has a plurality of bearing elements which are movable inwards and outwards, and the tire gripper inserts the plurality of bearing elements into the hole of the tire and grips the tire in such a way that the inner circumference of the tire is increased outwards by the movement of the plurality of bearing elements which are inserted into the hole.

[0022] According to this preferred aspect, when the bearing elements are inserted into the hole of the tire and moved outwards, the tire can be supported from its inner circumferential side and its position relative to the center of the tire grippers can be adjusted (centering).

[0023] The tire grippers are movable both upwards and downwards. When the tire grippers, which hold the tire between them, are moved upwards, the tire can be perfectly lifted off the conveyor on a roller conveyor and then conveyed further. This enables high speeds in tire transport. 9) The tire conveying device according to yet another preferred aspect of the present invention comprises two tire gripping units arranged as a plurality of tire gripping units along the conveying direction, wherein a receiving stage in which the tire is conveyed, a measuring stage in which an imbalance of the tire is measured, and a marking stage in which a mark is printed on the tire are arranged along the conveying path of the tire, and these stages are arranged at equal intervals from each other along the conveying direction, and the drive unit moves the two tire gripping units in the conveying direction with a stroke corresponding to this interval.

[0024] According to this preferred aspect, two tire gripping units can be moved together in the conveying direction with a stroke corresponding to the interval between the equally spaced stages. For example, while a tire that has already been processed in the receiving stage is centered and conveyed to the measuring stage by one of the tire gripping units, a tire that has already been measured in the measuring stage is simultaneously centered and conveyed to the marking stage by the other tire gripping unit. The device according to this preferred aspect is characterized in that a tire is centered and then conveyed very quickly to and from different processing stages. When this device is used in tire testing systems with such different processing stages, it promotes a reduction in testing time. OPERATIONAL BENEFITS OF THE INVENTION

[0025] According to the present invention, if the tire is held from both sides and then conveyed, it can be transported at high speeds without slippage, and the risk of tire displacement caused by rotation during conveying is avoided. Since the tire is simply gripped by the tire gripping unit, it can also be centered. This saves time that was previously required for centering at each of the different processing stages when tires were conveyed sequentially to these stages. Furthermore, the various gripping units are moved simultaneously, so that the tires can be conveyed into and out of the processing stages at the same time. This reduces the overall processing time of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Fig. Figure 1 is a top view of a tire imbalance measuring system.

[0027] Fig. Figure 2 is a front view of a measuring stage.

[0028] Fig. Figure 3 is a rear view of a marker step.

[0029] Fig. Figure 4 is a front view of a tire conveyor device.

[0030] Fig. Figure 5 is a side view that schematically represents a drive structure for forward and reverse movements.

[0031] Fig. Figure 6 is a top view of a tire bearing mechanism.

[0032] Fig. Figure 7 is a side view in cross-section of part of the tire bearing mechanism.

[0033] Fig. Figure 8 is a top view depicting a tire conveying process.

[0034] Fig. Figure 9 is a top view depicting a tire conveying process.

[0035] Fig. Figure 10 is a top view depicting a tire conveying process.

[0036] Fig. Figure 11 is a top view depicting a tire conveying process.

[0037] Fig. Figure 12 is a top view depicting a tire conveying process.

[0038] Fig. Figure 13 is a top view depicting a tire conveying process.

[0039] Fig. Figure 14 is a top view depicting a tire conveying process.

[0040] Fig. Figure 15 is a top view depicting a tire conveying process.

[0041] Fig. Figure 16 is a top view depicting a tire conveying process.

[0042] Fig. Figure 17 is a top view depicting a tire conveying process.

[0043] Fig. Figure 18i is a top view of a tire imbalance measuring system equipped with a tire conveying device according to a further embodiment.

[0044] Fig. 19 is a front view of the tire conveyor device according to the embodiment in Fig. 18

[0045] Fig. 20 is a top view of a tire storage mechanism according to the embodiment in Fig. 18.

[0046] Fig. 21 is a front view of the tire bearing mechanism according to the embodiment in Fig. 18.

[0047] Fig. Figure 22 is a top view of a tire storage mechanism according to yet another embodiment of the present invention.

[0048] Fig. Figure 23 is a top view of a tire storage mechanism according to yet another embodiment of the present invention. EXECUTIONAL FORMS FOR IMPLEMENTING THE INVENTION

[0049] In the following, embodiments of the invention will be explained in detail with reference to the accompanying drawings. Design 1

[0050] Fig. Figure 1 is a top view of a tire imbalance measuring system. The tire imbalance measuring system is a tire testing system equipped with a tire conveyor according to embodiment 1 of the present invention. The tire imbalance measuring system is designed to measure the imbalance of tires. The tire imbalance measuring system includes a receiving stage. 1 , a measuring stage 2 and a marking level 3 The steps are arranged one after the other in this sequence, in a direction from the front to the back of the system, representing a tire conveying direction (from right to left in the drawing). 1 , 2 and 3 are equipped with a tire conveyor device 4 equipped, which successively passes a tire W through these stages 1 , 2 and 3 promoted.

[0051] The tire imbalance measuring system has an interval in the front-to-back direction between a center position a of the recording stage. 1 and a middle position b of the measuring stage 2 and an interval in the front-to-back direction between the center position b of the measuring stage 2 and a middle position c of the marking level 3 fixed in the same size.

[0052] The admission stage 1 includes a pair of left and right intake belt conveyors 5 The tire W, which is arranged horizontally, is placed on the receiving conveyor. 5 arranged and placed in the middle of the recording stage 1 promoted by both left-wing and right-wing admission promoters 5 are independently powered by servo motors 6 driven, each of which can rotate in forward and reverse directions. When the left and right intake conveyors 5Driven synchronously in their normal direction, the tire W will be on the conveyors 5 promoted backwards. When the left and right intake conveyors 5 Driven synchronously in opposite directions, the tire W, which is on the conveyors, rotates. 5 is arranged around its own axis on the conveyors 5 .

[0053] When the tire W enters the intake stage 1 If the material has been transported, a peeling agent such as soapy water is applied to the inner circumference of a bead area of ​​the tire W using an application roller. 7 applied. The bead area of ​​the tire W often adheres firmly to the edges and cannot be separated from them, which later becomes a problem when the tire W is removed after the imbalance in the measuring stage. 2 The measurement was taken. The puller is applied to the bead area to avoid this problem.

[0054] As in Fig. The measuring stage shown in 2 measures 2 A centrifugal force is generated horizontally by the imbalance of tire W when the tire W is rotated. Based on the measurement obtained, the imbalance and the minimum weight position of tire W are processed and calculated. The measurement stage 2 includes a measuring instrument 10 with a spindle 9 , which have a lower edge 8 is connected and rotates this, and a rim lifting machine 12 , which has an upper edge 11 moved up and down on the axis of the spindle.

[0055] The measuring instrument 10 The processing results determine, for example, the size of an imbalance and the angle of the tire W, as described below. First, the tire W is measured between the lower edge 8 , which has an upper end of the spindle 9 is connected, and the upper edge11 mounted, which is movable downwards and connected to the spindle 9 is connected. Compressed air is then fed into the tire W, which is located between the upper edge 11 and the lower edge 8 is held to inflate the tire W to a predetermined pressure level. The inflated tire W is then pushed through the spindle. 9 The tire is rotated at a predetermined speed. If a centrifugal force in the horizontal direction is generated in the tire W due to an imbalance, this centrifugal force is measured by a load detector using load cells. Simultaneously, the rotational position of the tire W is measured by a rotary encoder. Based on these measurements, the measuring instrument determines 10 the processing results of a size of the imbalance and an angle of the tire W.

[0056] As in Fig. As shown in 3, the marking station prints 3 for example, a minimum weight position based on the data in the measuring station 2 the determined measurement result onto a side surface of tire W. The marking station 3 is equipped with a marking device 13 provided with a marker head 13a , which is movable up and down. The marker head. 13a A print head presses onto a thermal transfer belt, transferring a printed mark to a predetermined position on the tire's sidewall. The marking station 3 is also equipped with extraction conveyors 14 equipped with wide belts driven by motors.

[0057] Fig. Figure 4 is a front view of the tire conveyor device. Fig. Figure 5 is a side view that schematically shows a drive structure for forward and reverse movements. Fig. Figure 6 is a top view of a tire bearing mechanism. Fig. Figure 7 is a side cross-section through part of the tire bearing mechanism. With reference to the Fig. 4 to Fig. 7 and Fig. 1. The structural features of the tire conveyor device are described in detail below.

[0058] A tire conveyor device 4 According to the present embodiment, it includes feet. 15 , which are elongated in the forward-backward direction. The feet 15 are attached to the left and right sides of a conveyor track that runs along the forward-backward direction, representing a tire conveying direction. The tire conveying device 4 It also includes tables that can be moved forwards and backwards. 16 , each at the feet 15 are mounted so that they can move in the forward and backward direction, and two tire gripping units 17A and 17B, which are located at two front and rear positions of the forward and backward moving tables 16 are planned.

[0059] A pair of left and right rails 18 , which are elongated rails extending in the forward-backward direction, are located on an upper surface of the respective left and right feet. 15 provided. The left and right rails 18 run parallel to the conveying direction. The tables move forwards and backwards. 16 are on the tracks 18 via gliders 19 attached, which are movable in the forward-backward direction. The tire gripping units 17A and 17B , which are located at two positions in the forward-backward direction of the forward and backward moving tables 16 The provided components each include a pair of left and right tire bearing mechanisms. 20 The tire bearing mechanisms 20They lie opposite each other across the conveyor belt.

[0060] On the undersides of the forward and backward moving tables 16 are rack and pinion gears 21 provided, extending in the forward-backward direction, with downward-pointing teeth, and pinions 21 engage with the respective racks 21 one. As in the Fig. 4 and Fig. As shown in section 5, these are pinions. 22 with a rotating wave 23 connected. The rotational wave 23 is a long wave that extends in a left-right direction and horizontally between the mid-positions of the feet. 15 is suspended. One of the feet 15 is equipped with a servo motor 24 equipped with a timing belt 25 is around the servo motor 24 and the rotational wave 23 laid. The servo motor 24 and the rotational wave 23 They are therefore operated in concert.

[0061] If the servo motor 24 When operated in its normal direction or in reverse, the left and right pinions rotate. 22 and thereby move the tables that move forwards and backwards 16 in both forward and backward directions. When the tables 16 In this way, the front and rear tire gripping devices move. 17A and 17B synchronously in the forward-reverse direction. This is the mechanism of the drive unit according to the present embodiment.

[0062] The drive unit, which powers the tire gripping units 17A and 17B The device, which moves in the conveying direction of the tire W, is arranged on both sides and below the conveying path of the tire W. This leaves a free space in the upper direction of the conveying path of the tire W. Through such a space, when the upper edge 11of the measuring instrument 10 , which is the imbalance in the measuring stage 2 is moved up and down, or the marker head 13a the marking device 13 in the marking level 3 The upward and downward movement is not disrupted. Therefore, the sequence of process steps can be carried out efficiently.

[0063] The tire bearing mechanisms 20 the tire gripping unit 17A , 17B each has a table that moves up and down 26 equipped with a sliding mechanism that moves up and down from the forward and backward moving table 16 It is carried with a table that can be moved left and right. 27 , which is caused by the table moving up and down 26 It can be moved left and right, and has a tire gripper. 28 , which is located at one end of the table that can be moved left and right27 is attached to the side of the conveyor belt.

[0064] The table that moves up and down 26 includes management positions 29 and a rack 31 There are four management teams. 29 , which move downwards from the table that moves up and down 26 extend. The management teams 29 are in sliding guides 30 used on the table that moves forwards and backwards 16 are arranged and thus mounted to slide upwards and downwards. The rack 31 extends from the table that moves up and down 26 downwards. The table that moves forwards and backwards. 16 is accompanied by a tickle 32 provided that fits into the rack 31 intervenes, and with a servo motor 33 , who enjoys the tickle 32 moved forwards and backwards. When the servo motor 33Whether moving forwards or backwards, the tickle rotates 32 and thus moves the table up and down. 26 Up and down. This is the mechanism of the drive unit for upward and downward movements to move the table up and down. 26 up and down by rotating the pinion 32 according to the present embodiment.

[0065] The table that can be moved left and right 27 is on rails 39 mounted on an upper surface of the table that moves up and down 26 by gliders 40 are attached. The table that can be moved left and right 27 is on the tracks 39 Mounted so that it can move in the left-right direction. A rack and pinion. 41, whose teeth are facing upwards, is aligned in the left-right direction on a rear part of the table which can be moved left and right. 27 arranged. The table that moves up and down is arranged. 26 includes a sprocket 42 , which goes into the rack 41 intervenes, and a servo motor 43 , which the pinion 42 moved forwards and backwards. When the servo motor 43 As the gear is moved forwards or backwards, it rotates. 42 and thus moves the table that can be moved left and right. 27 in the left-right direction perpendicular to the conveyor path. This is the mechanism of the drive unit for left and right movements according to the present embodiment.

[0066] The tire gripper 28 has a forked support arm 44 The support arm 44It has the form of a horizontal lever at one end of the table, which can be moved left and right. 27 on the side of the conveyor belt. As in the Fig. 4 and Fig. Figure 6 shows the middle parts in the forward-backward direction of brackets. 45 , which are elements that can be moved back and forth, pivotable with the ends of the support arm 44 connected to the chambers 45 to allow free movement around a vertical axis p. In each of the brackets 45 are bearing rollers 46 , which are arranged vertically, pivotable at the front and rear ends and freely rotatable on both sides. When the tables move left and right 27 When moving, four bearing rollers move. 46 the bracket 45 Towards or away from the conveyor belt. More precisely, when the tables that move left and right... 27 move, four bearing rollers step 45the brackets 45 They move forward to the conveyor belt or retreat from the conveyor belt.

[0067] One arm 45a extends laterally from an outer surface at the center of the clamp 45 outwards. A spring retainer pin 47 is standing on an upper surface of a base part of the support arm 44 arranged. A spring 48 is in a tense state between an edge of the arm 45a up to the spring retaining pin 47 arranged. Without any external force acting on the bearing rollers 46 The effect is that the brackets extend 45 along the forward-backward direction. More precisely, the four bearing rollers. 46 are caused by the tension of the springs 48 They are held in such a way that they are arranged in a row in the forward-backward direction. Two springs can be held in a tensioned state between the support arm. 44and the two front and rear positions of each bracket 45 be arranged.

[0068] Up to now, the design features of the tire imbalance measuring system according to the present invention have been described.

[0069] The following describes an operation of the system in which the tire W is successively conveyed through the different processing stages, and based on the Fig. 8 to Fig. 17 described. In the drawings and in the following description, the tire W is described and illustrated using numbers which denote the transport sequence. 1) As in Fig. As shown in Figure 8, a tire W (1) produced by casting is arranged horizontally and fed from the front of the device to the receiving stage. 1 The tire W (1) is conveyed by a conveyor not shown in the drawing. It is then transferred to the left and right receiving conveyors.5 The components are transferred, which are rotated synchronously in the normal direction, and the tire W (1) is moved backwards. At the same time, the pressure roller is in position. 7 in their waiting position below the conveyor surfaces. The tables move forwards and backwards. 16 the tire conveyor 4 are positioned in the front. The tire gripping unit 17A at the front, which is the upstream side of the conveying direction of the tire W, is in a middle position a of the intake stage 1 arranged. The tire gripping unit 17B on the reverse side, which represents the downstream side of the conveying direction of the tire W, is in the middle position b of the measuring stage 2 arranged. The tables move up and down. 26 the tire gripping units 17A and 17Bare in their lower positions, the tables that move left and right 27 are in retracted positions, and the left and right tire grippers 28 are in waiting positions in which these grippers do not impede the movement of the tire W (1). 2) If, by means of the signal from a photoelectric sensor, it is detected that the central hole of the tire W (1) is in a position above the pressure roller 7 The admission promoters are located 5 stopped, and the pressure roller 7 moves upwards and penetrates the central hole of the tire W (1) from below. 3) In the left and right tire bearing mechanisms ( 20 ) the tire gripping unit 17A The servo motors are located on the front. 43 synchronously driven, and the tables that move left and right 27Both move forward along the conveyor belt, bringing them closer together. When the tables move left and right... 27 when they are close enough to each other, the tire W (1) is gripped by the grippers 28 seized. At the same time, two pairs of bearing rollers are seized. 46 , which are pivotable at the two front and rear ends of the clamps 45 are arranged and pressed against the tire W (1). Then the clamps begin 45 The springs stretch to move back and forth. 48 , and the tire bearing rollers 46 four on each side, on the left and right sides, are pressed further against tire B (1).

[0070] When the tire W (1) deflects from the center of the step, as it passes through the tire grippers 28 If held, one or more of the eight bearing rollers will lose their grip. 46 the contact with the tires W (1). However, if the tire grippers 28be pressed further until all eight bearing rollers 46 When the rollers are pressed against the tire W (1), the tire W (1), which is pressed through the bearing rollers in this way, is aligned in its position in the middle of the step and precisely centered.

[0071] Thus, the servo motors 43 the left and right tire bearing mechanisms 20 synchronously driven, and the tire W (1) is driven by the left and right tire grippers 28gripped and centered. This enables highly precise centering. For example, in devices where a plurality of reciprocating arms with bearing rollers at their ends on the left and right sides are provided, and the reciprocating arms are moved back and forth by a plurality of pneumatic cylinders to press the bearing rollers against the tire for centering, it is difficult to synchronize the plurality of pneumatic cylinders. In such devices, highly precise centering is difficult to achieve. With the centered tires W (1), the inner circumference (inner circumference of the bead area) is in contact with the pressure roller. 7 . 4) When the centering of the tire W (1) is complete, the left and right receiving conveyors are 5 turned in opposite directions, as in Fig. 9 is shown, and the tire W (1) is held by the bearing rollers 46guided and around its axis onto the receiving conveyor 5 rotated in a predetermined direction. During the rotation, the free-running pressure roller 7 the peeling agent is applied to the inner circumference of the bead area of ​​the tire W (1). 5) When the tire W (1) has been rotated about its own axis for a predetermined period of time for one or more revolutions, the stripping agent is completely applied over the entire inner circumference of the bead area. Then the receiving conveyors 5 stopped, and the pressure roller 7 is rotated downwards into a lower position. 6) Once the application of the squeegee is complete, the tables that can be moved left and right will be 27 and 27 the left and right tire bearing mechanisms 20 synchronously driven, so that they move back towards the conveyor track. The eight bearing rollers 46 the tire gripper 28This causes them to be pressed strongly against the tire W (1), and the tire W (1) is held securely so that it does not move between the left and right tire bearing mechanisms. 20 can fall off. The tire gripping unit 17A , which thus securely holds the tire W (1), can be moved quickly or stopped suddenly. 7) The tables that move up and down 26 the left and right tire bearing mechanisms 20 They are controlled to move upwards synchronously by a predetermined amount. Then the left and right tire grippers are activated. 28 , which grip the tire W (1) from the left and right sides, which is coated with the peeling agent, and move synchronously upwards to remove the tire W (1) from the receiving conveyors 5 to indicate upwards. 8) As in Fig. As shown in 10, the tables can be moved to the left and right. 16controlled synchronously to a reverse movement, and the tire W (1) which is controlled by the left and right tire grippers 28 Once lifted, it is transported backwards.

[0072] Conventional devices in which tires are conveyed by roller conveyors have the problem that the rollers often slip relative to the tires. However, when the tire W (1) is conveyed by the left and right tire grippers 28 Since the tire is gripped from both sides and conveyed backwards as described above, this problem of conventional devices is solved, and the tire W (1) can be conveyed at high speeds. Further advantages over conventional devices in which the tires are conveyed by roller conveyors are: less vibration and noise, and no accidental rotation of the tire W (1) during conveyance. 9) The amount of a backward movement of the tables moving forward and backward 16 , which represents a stroke, is adjusted according to the interval of the center positions of the steps 1 , 2 and 3 fixed. When the backward movement of the forward and backward moving tables 16 The tire gripping unit is therefore stopped. 17A on the front side that grips the tire W (1), in the middle position b of the measuring stage 2 arranged as in Fig. 11 is shown.

[0073] Next, the tables that move up and down will be discussed. 26 the left and right tire bearing mechanisms 20 controlled to a synchronous downward movement by a predetermined amount, and the tire W (1) is accordingly moved to the lower edge 8 applied. At the same time, the tire W (1) is gripped by the tire gripping unit. 17AOnce gripped, it is already centered. When the tables move up and down... 26 moving downwards, the tire W (1) is thus in correct positional orientation on the lower edge 8 Assembled. After the tables move forwards and backwards 16 The tire gripping unit is located where the tires have already been moved backwards into predetermined positions. 17B on the rear side in the middle position c of the marking step 3 . 10) Immediately after the tire W (1) on the lower edge 8 Once mounted, the tables that can be moved left and right will be 27 the left and right tire bearing mechanisms 20 They retracted synchronously away from each other. Then all the bearing rollers moved. 46 the tire gripper 28 away from the tire W (1) and return to their waiting positions, and the tables moving forward and backward 16move forward, as in Fig. 12 is shown. If the tables move forwards and backwards 16 have returned to their front positions, the tire gripping unit 17A on the front side back in the middle position a of the recording stage 1 arranged, and the tire gripping unit 17B On the back side, it is again in the middle position b of the measuring stage. 2 arranged as in Fig. 13 is shown. 11) In the measuring stage 2 will the upper edge 11 moved downwards onto the tire W (1) which is on the lower edge 8 is mounted, and a coupling shaft 11a , which extends from the center of the upper edge 11 extending downwards, enters the spindle 9 through a central hole of the tire W (1) and is connected to the spindle 9 connected, as in Fig. 2 is shown. Compressed air is then blown into the tire W (1), which is located between the upper edge 8 and the lower edge 11 is held to inflate the tire W (1) until a predetermined internal pressure level is reached. The inflated tire W (1) is then moved by the spindle. 9 The tire is rotated at a predetermined speed. During the rotation, a centrifugal force generated in the horizontal direction by the imbalance of tire W(1) is measured, and the rotational position of tire W(1) is measured. The imbalance and the minimum weight position of tire W(1) are then calculated and obtained from these measurements.

[0074] During the measurement process, steps 1) to 5) are performed in the recording stage. 1 carried out as in the Fig. 13 and Fig. Figure 14 is shown. Subsequently, a following tire W (2) is gripped by the tire gripping unit. 17Acentered, and the peeling agent is applied to the tire W (2). 12) In the measuring stage 2 Once the measurements are complete, the air is let out of the tire, and the upper edge 11 is moved upwards away from the tire. The tables that move left and right 27 the left and right tire gripping mechanisms 20 are then steered back into a synchronous upward movement towards the conveyor track. Then the tire W (1), at which the measurement is completed, is firmly gripped by the left and right tire grippers. 28 seized. In the admission stage 1 Steps 6) and 7) are carried out, and the tire W (2) coated with the peeling agent is firmly secured by the left and right tire bearing mechanisms. 20 held. 13) Then the left and right tables that move up and down are 26 the tire gripping unit 17BThe rear side is subjected to a synchronous upward movement by a predetermined amount. Then the left and right tire grippers are... 28 , which grasp the tire W (1), on which the measurement is completed, from the left and right sides, move upwards synchronously, and the tire W is lifted and from the lower edge 8 removed. In the tire gripping unit 17A On the front side, step 7) is carried out, and the tire W (2), which is coated with the peeling agent, is passed through the receiving conveyors. 5 raised. 14) As in Fig. As shown in 15, the tables that move forward and backward to the left and right will then be... 16 synchronously moved backwards, the tire W (1) at which the measurement is completed and which is moved by the tire gripping unit 17Bgripped on the rear side, and the tire W (2) which is coated with the peeling agent and which is gripped by the tire gripping unit 17A It is grasped on the front side and transported together to the rear. 15) When the movements of the forward and backward moving tables 16 The tire gripping unit is located when the tire is held to the rear. 17B on the rear side, which grips the tire W (1) at which the measurement is completed, in the middle position c of the marking stage 3 , as in Fig. 16 is shown. If the tables move up and down. 26 the left and right tire bearing mechanisms 20 To be controlled to a synchronous downward movement by a predetermined amount, the tire W (1) is centered and placed on the output conveyors. 14 arranged. Then the marker head is 13a the marking device 13moved downwards to imprint a mark of a specific color and shape at a predetermined position on the upper surface (side surface) of tire W (1). Simultaneously, steps 9) and 10) are carried out on the next tire W (2) in the measuring stage. 2 carried out.

[0075] Before the tire W (1) reaches the marking stage 3 As the tire W (1) is transported, its rotational position is corrected while the tire W (1) is still in the measuring stage. 2 is located so that a marker point, such as a minimum weight point that has been located and calculated, is immediately below the position of the marker head. 13a the marking device 13 is arranged.

[0076] After the tire W (1) is on the output conveyors 14 As has been arranged, the left and right tire grippers move 28 the tire gripper unit 17Bon the back side of the tire W (1). Immediately afterwards, the tables moving forward and backward move 16 forwards to return to their positions. This causes the tire gripping unit to 17A on the front side towards the recording stage 1 moves while the tire gripping unit 17B on the back side into the measuring stage 2 moved, as in Fig. 17 is shown. 16) If the marking processes in the marking stage 3 Once completed, the marker head moves. 13a upwards, to return to its waiting position. Furthermore, the output conveyors 14 switched on, and the tire W (1) on which the marking is completed is moved backwards.

[0077] If the two tire gripping units 17A and 17BOn the front and rear sides, the tire W is moved back and forth synchronously twice in the forward-backward direction with a predetermined stroke, which is a predetermined distance, thus becoming the intake stage. 1 , the measuring stage 2 and the marking level 3 transported at high speeds. Design 2

[0078] Fig. Figure 18 is a top view of a tire imbalance measuring system equipped with a tire conveying device according to embodiment 2. Fig. Figure 19 is a front view of the tire conveyor device. Fig. Figure 20 is a top view of a tire bearing mechanism. Fig. Figure 21 is a front view of a main part of the tire bearing mechanism.

[0079] A tire conveyor device 4 According to this embodiment, a base comprises 15 with an elongated shape in the forward-backward direction. The base 15It is mounted on one side of the conveyor track, which extends along the forward-backward direction, representing a tire conveying direction. The tire conveying device 4 It also includes a table that can be moved forwards and backwards. 16 , which is at the base 15 is attached and movable in the forward-backward direction, as well as two tire gripping units 17A and 17B , which are located at two front and rear positions of the forward and backward moving table 16 are planned.

[0080] Similar to embodiment 1, a pair of left and right rails are used. 18 , which are long rails extending in the forward-backward direction on an upper surface of the base 15 Attached. A table that can be moved forwards and backwards. 16 is on the tracks 18 via gliders 19Mounted components that are movable in the forward and backward direction. The mechanism of the drive structure of this forward and backward moving table. 16 is comparable to that of embodiment 1. Regarding the drive structure in Fig. 19 is a rack 21 , whose teeth point downwards, on a lower surface of the forward and backward moving table 16 arranged along a forward-backward direction, and a pinion 22 , which goes into this rack 21 It engages, is rotatable on a central part of the base. 15 It is mounted in the forward-reverse direction. Furthermore, a toothed belt is used. 25 around the pinion 22 laid, and a servo motor 24 is in the base 15 provided. The pinion 22 and the servo motor 24 They are therefore operated in concert.

[0081] In the drive unit according to the present embodiment, the motor moves when the servo motor 24 is rotated in the normal direction or in reverse to engage the pinion 22 to turn, the table that moves forwards and backwards 16 in the forward-backward direction, whereby the two tire gripping units 17A and 17B They move synchronously on the front and rear sides in the forward-backward direction.

[0082] As in the embodiment, the tire bearing mechanism 20 each tire gripping unit 17A , 17B with a table that can be moved left and right 27 equipped with a table that moves forwards and backwards 16 movable left and right on rails 39 and gliders 40 is appropriate, a frame that moves up and down 52, which is movable upwards and downwards by an end part of the table which is movable to the left and right 27 on the side of the conveyor track via vertical rails 50 and gliders 51 is stored, and a tire gripper 28 , which is located at a free end of the upward and downward moving frame 52 is attached. The frame that moves up and down is attached. 52 becomes spindle-shaped through a spindle 54 driven in the normal direction and in the reverse direction by a servo motor 53 is being filmed.

[0083] The tire gripper 28 includes three bearing rollers 46 , which are vertically aligned. On a lower side of the up and down moving frame. 52 are the bearing rollers 46 Freely rotatable by means of free ends of arms that can move back and forth 55 mounted, which are movable back and forth about a rotational axis q, as in the Fig. 20 and Fig. 21 is shown.

[0084] A storage facility 56 each arm that moves back and forth 55 penetrates the upward and downward moving frame 52 and springs upwards. An actuating arm. 57 , which together with the arm that moves back and forth 55 above the storage area 56 which is movable back and forth, has a projecting part at one upper end of each bearing shaft. 56 connected. One of the actuating arms 57 is through a cylinder 58 moved back and forth. This one actuating arm 57 is with the other actuating arms 57 via connecting links 59 coupled. When the three actuating arms 57 , which are coupled in this way, and are moved back and forth simultaneously, the three bearing rollers 46 They move back and forth synchronously and move inwards and outwards.

[0085] As in the Fig. 20 and Fig. As shown in figure 21, the back-and-forth movement is performed by one of the actuating arms. 57 to a rotary encoder 61 via a gear mechanism 60 transferred, and a position of the reciprocating bearing roller 46 is determined by the position of the reciprocating actuating arm 57 Detected. By controlling the cylinder. 58 based on the information provided by the rotary encoder 61 Once detected, the positions of the bearing rollers will be determined. 46 controlled.

[0086] If the bearing rollers 46 , which are moved inwards, all near the center of the tire gripper 28 Once assembled, the bearing rollers can 46 into the center hole of the tire W from above by moving the upward and downward movable frame 52 They can be inserted and removed both upwards and downwards. If the bearing rollers46 , which are gathered in this way and inserted into the center hole of the tire W, are moved synchronously outwards, the bearing rollers can 46 Store the tire W in such a way that the inner circumference of the bead area of ​​the tire W is increased. This adjusts the position of the tire W to the center of the tire gripper. 28 (Centering). If the frame moves up and down 52 with the bearing rollers 46 As the tire W is moved upwards and downwards, pressing it from its inner circumference, the tire W can be moved upwards and downwards.

[0087] As in embodiment 1, the tire conveying device characterized herein moves 4 the table that moves forwards and backwards 16 in the forward-reverse direction with a stroke corresponding to the interval between the stages, whereby the tire W, which is gripped by the front and rear tire gripping units 17A, 17B is grasped by the middle positions a), b) and c) of the steps 1 , 2 and 3 is being promoted. embodiment 3

[0088] Fig. Figure 22 shows a tire imbalance measuring system with a tire conveyor device. 4 according to embodiment 3 of the present invention. According to this embodiment, the tire bearing mechanisms comprise 20 the tire gripping units 17A and 17B Each frame moves upwards and downwards. 52 and tire grippers 28 , located on a free end side of the upward and downward moving frame 52 are attached. Although this is not shown in the drawing, the frame moves up and down. 52 driven in a spindle-like manner by a spindle that is rotated in the normal direction and in the reverse direction by a servo motor.

[0089] The frame that moves up and down 52 includes a pair of front and rear actuating arms 65 , which are movable back and forth in a horizontal direction. The actuating arms 65 are each equipped with a cylinder 67 via a backward-driven mechanism 66 interconnected in a cooperating manner. The operating arms 65 They are thus moved back and forth synchronously in opposite directions. The free ends of the actuating arms 65 are each equipped with tire grippers 28 equipped.

[0090] The tire gripper 28 includes a moving element 68 , which is located at the free end of the actuating arm 65 is mounted so that it can move back and forth in a horizontal direction, and a pair of bearing rollers 46 , which are freely rotatable through both ends of the reciprocating elements 68 be stored.

[0091] According to the embodiment characterized herein, the bearing rollers center 46 the front and rear tire width 28 then, when the operating arms 65 They are moved towards each other, gripping the tire W from its outer circumference. This results in the tire grippers 28 The centered tire W can grip. If the frame moves up and down... 52 As it is moved upwards, the tire W, which is guided by the tire grippers, can 28 Once seized, it will be lifted upwards.

[0092] As in embodiment 1, the tire conveying device characterized herein moves 4 the table that moves forwards and backwards 16 in the forward-reverse direction with a stroke corresponding to the interval between the stages, so that the tire W, which is passed through the front and rear tire gripping units 17A and 17Bis grasped by the middle positions a), b) and c) of the steps 1 , 2 and 3 is promoted. Design 4

[0093] Fig. Figure 23 shows a tire imbalance measuring system with a tire conveyor device. 4 according to embodiment 4 of the present invention. According to this embodiment, the bearing mechanisms comprise 20 the tire gripping units 17A and 17B Each frame moves upwards and downwards. 52 and tire grippers 28 , located at a free end of the upward and downward moving frame 52 are attached. Although this is not shown in the drawing, the frame moves up and down. 52 moved up and down by a spindle or cylinder.

[0094] The frame that moves up and down 52 is equipped with a bearing element 52aEquipped with a shape that is elongated in the forward and reverse directions. A pair of front and rear tire grippers. 28 is on a lower side of the bearing element 52a planned. The tire gripper 28 includes a pair of front and rear bearing elements 70 , which run parallel to each other in the forward-backward direction along long guide rails 69 is movable, extending in the forward-backward direction, and a pair of bearing rollers 46 , which are freely rotatable at the end parts of the left and right bearing elements 70 are stored.

[0095] An actuating arm 71 , which has a gearbox with a servo motor 71 The coupled component is located in the center of the bearing element. 52a Arranged in the forward-backward direction. The two ends of the actuating arm. 72 and the bearing elements 70 are connected via coupled rods 73coupled, so that they move in a coupled manner. When the actuating arm 72 Moving in the normal direction and in the reverse direction, the bearing elements move 70 moving towards each other and away from each other in a forward-backward direction.

[0096] If the bearing elements 70 When moved parallel to each other, the bearing rollers press 46 the front and rear tire grippers 28 The opposing arms, which face each other, grip the tire W from its outer circumference and thus support the tire W. This simultaneously centers and grips the tire W. When the frame moves up and down... 52 If the tire W is moved upwards with the tire W held in this way, the tire W can be lifted.

[0097] As in embodiment 1, the tire conveying device characterized herein moves 4 the table that moves forwards and backwards 16in the forward-reverse direction with a stroke corresponding to the interval between the stages, so that the tire W, which is passed through the front and rear tire gripping units 17A and 17B is seized by the middle positions a), b) and c) of the levels 1 , 2 and 3 is promoted. Modified embodiment

[0098] A modified embodiment of the present invention is described below. 1) The design of the tire grippers 28 It can be simplified. The tire W is supported by a total of four bearing rollers. 46 seized, which are forked at the ends of support arms 44 are appropriate. 2) Preferably the bearing rollers 46The clamping mechanism, which holds the tire W between its left and right sides, provides a non-slip surface to prevent the tire W from falling when lifted. Preferred examples of such non-slip surfaces are: a roughened surface with a silky texture, a surface with a large number of fine teeth and protrusions, and a surface with a large number of annular grooves and ribs. 3) A possible design for the synchronous movement of the front and rear tire gripping units 17A and 17B In the forward-backward direction, a table that can move forwards and backwards. 16 , which runs along railway tracks 18is movable and coupled to an endless chain or belt driven in the normal or reverse direction, with stops that engage each other at the front and rear ends of the forward and backward moving table 16 turned towards and at the base 15 are attached. In this design, positions are created in which the movements of the tire gripping units are located. 17A and 17B They are stopped by touching the gripping units. 17A and 17B controlled at the attacks. 4) A possible design for moving the tables that can move left and right 27 In the forward-reverse direction, a spindle, driven by a servo motor in the normal and reverse directions, is used to move the table, which can be moved left and right. 27 by a spindle drive. 5) In the embodiments described so far, the present invention is applied to a tire imbalance measuring system for testing the imbalance of tires. However, the invention is not necessarily limited to such tire imbalance measuring systems, but is also applicable to tire conveyor systems, for example in tire production lines.

[0099] According to the invention, two tire gripping units are provided. However, three or more tire gripping units can also be provided, wherein three or more tire gripping units are preferably moved together in the conveying direction, with a stroke equal to an interval between four or more processing stages that are arranged at equal intervals from one another. Reference symbol list 1 recording stage 2 measuring stage 3 Marking level 16 forward and backward moving tables 17A Tire gripping unit 17B Tire gripping unit 20 tire bearing mechanism 28 tire grippers 45 bracket 46 Bearing roller 68 moving element 70 Bearing element W tires

Claims

[1] Tire conveying device comprising: a plurality of tire gripping units arranged along a conveying direction of a tire, each of which is designed to grip the tire from an outer circumferential side or an inner circumferential side of the tire; and a drive unit for moving the majority of tire gripping units in the conveying direction; which drive unit moves the tire gripping unit on an upstream side of the conveying direction and the tire gripping unit on a downstream side of the conveying direction, each gripping the tire, together to the downstream side of the conveying direction. [2] Tire conveyor device according to claim 1, in which the drive unit includes a movable body for moving the tire gripping units in the tire conveying direction, and the moving body moves along a path of motion that is arranged on one side or on both sides of a conveyor track of the tire. [3] Tire conveyor device according to claim 2, in which the path of movement is formed by a rail that extends along the conveyor path of the tire, and the movable body is a movable table that moves along the rail with the tire gripping units attached to it. [4] Tire conveyor device according to any one of claims 1 to 3, in which each of the tire gripping units grips the tire in a horizontal arrangement from both outer circumferential sides of the tire, and the drive unit moves the tire gripping units on the upstream and downstream sides of the conveying direction simultaneously along the conveying direction. [5] Tire conveyor device according to any one of claims 1 to 3, in which the tire gripping units each grip the tire in a horizontal arrangement in such a way that the inner circumference of the tire is increased, and the drive unit moves the tire gripping units on the upstream and downstream sides of the conveyor simultaneously in the conveying direction. [6] Tire conveyor device according to claim 4, in which the tire gripping units each have tire grippers facing each other, which tire grippers can move towards and away from each other and up and down, and the tire grippers can move towards each other and grip the tire in such a way that the tire is clamped from both sides. [7] Tire gripping units according to claim 4, in which the tire gripping unit has tire grippers that can move horizontally towards and away from each other and are movable upwards and downwards, which tire grippers are movable back and forth towards and away from each other in such a way that the tire is clamped from both sides. [8] Tire gripping units according to claim 5, in which the tire gripping units each have a tire gripper that is movable upwards and downwards and can be inserted into a hole in the tire from above and pulled out again, which tire gripper has a plurality of bearing elements that are movable inwards and outwards, and the tire gripper has a plurality of bearing elements that are movable inwards and outwards, and the tire gripper inserts the majority of bearing elements into the hole of the tire and grips the tire in such a way that the inner circumference of the tire is increased outwards by a movement of the majority of bearing elements inserted into the hole. [9] Tire conveyor device according to any one of claims 1 to 3, comprising two Tire gripping units arranged as a plurality of tire gripping units along the conveying direction, wherein a receiving stage in which the tire is received, a measuring stage in which an imbalance of the tire is measured, and a marking stage in which a mark is printed on the tire are provided along the conveyor path of the tire, and these stages are arranged at equal intervals from each other in an interval along the conveying direction, and the drive unit moves the two tire gripping units along the conveying direction with a stroke corresponding to the interval.