JPH0637094B2 - Auxiliary buff method and device for retreaded tire - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an auxiliary buffing method and device for retreaded tires.

(Prior Art) In the process of buffing and removing the ground contact surface of a worn tire and attaching a new tread to a buffed tire to obtain a regenerated tire, while rotating the worn tire, one shoulder portion to the other A so-called main buffing machine that buffs the ground contact surface by moving a rotating buffing body in the meridian direction toward the shoulder portion of the vehicle has been used.

(Problems to be Solved by the Invention) By the way, the buff rotating body in the conventional main buffing machine needs to be moved following the tire in the meridian direction of the tire. Therefore, the copying motion is set by a template or the like. There is.

However, the groove depth of a specific pattern, for example, a tread having a rug pattern or a snow pattern, is not the same in the tire equator portion S3 and the tire shoulder portions S1 and S2 as shown by the broken line of the lug pattern tread in FIG. The groove depth of the tire shoulder parts S1, S2 is the tire equatorial part S3.
Therefore, when buffing with the main buffing machine, buffing with the groove depth of the shoulder portion as a reference, the buffing amount becomes too large, and the tire body TB of the equatorial portion S3 Since the damage may be caused, the copying motion of the buff rotating body is set by the template or the like with reference to the groove depth of the equator portion S3. However, in this method, as shown in FIG. 12, the shoulder portion S of the tire T is
The residual grooves M1 and M2 remain unbuffed in 1 and S2.

If you try to remove these residual grooves M1, M2 with the above-mentioned main buffing machine, there will be fatal problems such as damage to the tire body due to excessive cutting, dimensional quality deviation, new tread rubber attachment amount, etc. In addition, in terms of efficiency, there was a problem that it took too long for buffing a single tire.

Therefore, if the remaining grooves M1 and M2 are shaved manually in a separate process using a so-called hand buffing machine, the pressing force of the hand buffing machine will not be constant and a uniform buffing surface cannot be obtained. Not only was it inefficient, but it also had the harmful effect of cutting too much.

It is an object of the present invention to provide an auxiliary buffing method and apparatus capable of buffing the tire contact surface S left by the buffing of the main buffing machine uniformly and efficiently.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention firstly buffs the ground contact surface S of the worn tire T by the buff rotating bodies 19 and 20 in an auxiliary manner. In the method, the tire T, which is vertically installed, is scooped up by the tire support 4 and rotated, and a pair of left and right buff rotating bodies 19, 20 are pressed against the ground contact surface S and rotated, and the tire equatorial line is rotated. It is characterized by buffing by reciprocating along the meridian direction at symmetrical positions.

Secondly, the worn ground contact surface S of the tire T is buffed auxiliary by the buff rotating bodies 19 and 20, and a pair of left and right sides is provided on one side in the axial center direction of the tire T that is vertically installed. A tire support 4 having a length extending over the tire bead portions B1 and B2 is inserted into and removed from the rim mounting hole R and vertically movable, and a transmission means for rotationally driving the tire support 4
A pair of left and right buff rotating bodies 19, 20 are provided at positions corresponding to the ground contact surface S of the tire T that is scooped up by providing 15 and inserting the tire support 4 into the rim mounting hole R and raising it.
And the transmission means 21 and 22 for rotating each of the buff rotating bodies 19 and 20 about their axes, and the buff rotating bodies 19 and 20 being pressed against the ground contact surface S and contacting at the symmetrical position of the tire equator. Buff reciprocating means that reciprocates in the meridian direction following the ground S
It is characterized by having 23 and 24.

(Operation) According to the present invention, the tire T having buff remaining grooves M1 and M2 on the ground contact surface, for example, the shoulder portions S1 and S2, is installed vertically in the auxiliary buffing machine 1.

The tire support 4 is inserted into the rim mounting hole R of the loaded tire T.
When the tire support 4 is inserted and raised,
Has a length that extends over a pair of left and right tire bead portions B1 and B2, so that the tire T is picked up and supported.

The tire T is rotated by transmitting the rotational force to the tire support 4 by the transmission means 15 in the state where the tire T is picked up. On the other hand, at the symmetrical position of the equator line 0-0, the pair of left and right buff rotating bodies 19, 20 are connected to the shoulder portion S of the tire T.
It is pressed against 1, S2 and is rotated by the transmission means 21,22, and is reciprocated in the meridian direction by the buff reciprocating means 23,24, so that it is uniform along the shoulder portions S1, S2 of the tire T. Buffing is done.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 to 4 showing the overall configuration, reference numeral 1 denotes an auxiliary buffing device, which is one side of a machine frame 2 that is erected and framed, and is buffed by a main buffing machine to be in contact with a ground surface S, for example, The left and right shoulder portions S1 and S2 have a tire accommodating portion 3 into which a tire T having residual grooves M1 and M2 can be vertically installed and loaded.

Reference numeral 4 denotes a tire support, which is a pair of roll bodies 5 having a length extending over a pair of left and right bead portions B1 and B2 of the tire T.
It is composed of 6 and is provided at one side in the axial direction of the tire T vertically installed in the tire accommodating portion 3, and can be inserted into and removed from the rim mounting hole R of the tire T and is vertically movable to scoop up the tire T. Has been done.

In this embodiment, as shown in FIGS. 1 and 5, the parallel link 8 that swings in parallel in the tire axial direction by the expansion and contraction operation of the expansion and contraction cylinder 7 is provided with the mount 9, and the mount 9 is provided with the motor 10. A pair of rolls 5 and 6 that constitute the tire support 4 are rotatably supported by bearings 11 while being placed, and the parallel link 8 is extended by expanding the telescopic cylinder 7 from the contracted state shown in FIG. Is raised in parallel as shown by the chain line in FIG. 5, the tire support 4 is loaded into the rim mounting hole R and is raised in parallel, and the tire inside the housing portion 3 is inserted through the left and right bead portions B1 and B2. It is designed to scoop up T. On the other hand, when the telescopic cylinder 7 is contracted from the extended state, the tire support 4 is pulled out from the rim mounting hole R and lowered.

The tire support 4 scoops up the tire T to rotate the tire T in the direction of arrow A in FIGS. 1 and 8, so that the rolls 5 and 6 are rotationally driven by the transmission means 12 about their axes. In this embodiment, FIG. 2, FIG. 4, FIG. 5 and FIG.
As shown in the figure, install the sprocket wheels 13 and 14 on the roll shafts of the rolls 5 and 6, wind the chain 15A around these wheels 13 and 14, and at the same time,
By connecting the output shaft 16 of the motor 10 in an interlocking manner,
As shown in the figure, the rolls 5 and 6 are supposed to rotate in the direction of arrow B, where the wheels 13 and 14 and the chain 15A are
And the like constitute the transmission means 15 of the tire support 4.

The transmission means 15 may be a belt instead of the chain 15A or the like, or may be a gear, and the outer surface of the roll bodies 5 and 6 has a knurled shape as shown in FIG. The uneven ridges 17 and 18 are formed to surely rotate the tire T in the direction of arrow A without slipping.

Reference numerals 19 and 20 are a pair of left and right buff rotating bodies, and both shoulder portions of the tire T scooped up by the tire supporting body 4.
It is provided at a position corresponding to S1 and S2 and symmetrical with the tire equator line 0-0.

The pair of left and right buff rotors 19 and 20 have their axes in a direction orthogonal to the tire axis, and the transmission means 21 and 22 are arranged around the axes.
It is driven by the reciprocating means following the outline of the shoulder portions S1 and S2 while being pressed against the shoulder portions S1 and S2 while maintaining the symmetrical position completion of the tire equatorial line 0-0.
The meridian direction shown in Fig.7 (1) (2) and Fig.11 by 23,24
It is supposed to reciprocate by D1 and D2.

In this embodiment, a motor 27 having a speed reducer 26 is provided on the ceiling portion 25 of the machine frame 2 to give a reciprocating motion to the pair of left and right buff rotating bodies 19 and 20, but the same applies to the speed reducer 26 and thereafter. Because of the configuration, one buff rotary body 19 will be described below as a representative, and the other buff rotary body 20 is indicated by common reference numerals.

A pair of left and right guide shafts 28, 29 are attached to the upper part of the machine frame 2 with their axial directions being the vertical direction.
A support base 32 is attached to the 8,29 via a tubular slider 30,31 so as to be vertically movable.

The crank arm 34 is attached to the output shaft 33 of the reduction gear 26 described above, and the crank pin 35 of the crank arm 34 and the bearing pin 36 of the support base 32 are connected by a crank rod 38 having a screw adjusting portion 37. There is.

Therefore, the speed reducer 26 is transmitted by the motor 27 via the transmission means 27A.
When the output shaft 33 is rotated, the support 32 is moved up and down on the guide shafts 28 and 29 by the crank motion.

Brackets 39 and 40 are attached to the tubular sliders 30 and 31 of the support 32 as shown in FIG.
, A motor mount 45 having pressing arms 43, 44 via pins 41, 42 is mounted swingably around the pins 41, 42 as a fulcrum, and a motor 46 is mounted on the lower part of the motor mount 45 via a bracket 46. 47 is installed.

The pressing arms 43 and 44 are extended as an inward upward inclination, and the support shaft 50 of the buff rotating body 19 is rotatably supported at the extending ends of the arms 43 and 44 via bearings 48 and 49. ,
A buff rotating body 19 is provided at one end of the support shaft 50, and a winding transmission body 52 is provided across the other end of the support shaft 50 and the output shaft 51 of the motor 47, where the buff rotating body 19 is a motor 47. It is driven to rotate, and the winding transmission body 52 and the like serve as the transmission means 21.

Further, as shown in FIGS. 7 (1) and (2), both ends of the telescopic cylinder 55 are pivotally connected by the pins 56 and 57 across the bracket 53 attached to the support base 32 and the bracket 54 attached to the motor mount 45. The pressing arms 43,44 are attached to the pins 41,4
The telescopic cylinder 55 is swingable around the fulcrum 2 as a fulcrum, and a return spring 58 is stretched between the pressing arms 43 and 44 and the support base 32.

Therefore, in the present embodiment, the buff rotating body 19 is moved to the shoulder portion via the pressing arms 43 and 44 by the contraction operation of the telescopic cylinder 55.
By being pressed against S1, the above-mentioned raising operation of the support base 32 causes
While the buff rotating body 19 is rotating at a high speed, it is moved forward along the meridian direction D1 along the shoulder portion S1 and is also returned by the above-described descending movement of the support 32.
When rotating the tire support 4 once, the buff rotating body 1
By reciprocating the 9 and 20 multiple times, all the remaining grooves M1 and M2 are buffed.

It is to be noted that the buff rotator 19, 20 has a wavy disc in the axial direction and a polishing band attached to the disc.

In addition, in the figure, 59 is a gate means, and FIG.
As shown in FIG. 4, the guide shafts 60 and 61, which are part of the machine frame 2 on the left and right of the upper portion of the tire accommodating portion 3, are rotatably covered with the tubular bodies 62 and 63, and the tubular bodies 62 and 63 are bracketed. The idle rollers 66 and 67 are mounted vertically via 64 and 65, and
The springs 70, 71 are stretched over the arms 68, 69 protruding from the 2, 63 and the machine frame ceiling 25. Therefore, when the tire T is loaded against the springs 70 and 71,
The tire T loaded by the action of the springs 70, 71 is mounted on the idle roller.
Hold at 66 and 67 so that they do not fall.

Further, reference numeral 72 is a tire lifter, which is mounted on the bottom of the tire accommodating portion 3 via a pantograph support 73 to mount a tire 73A.
Is mounted, and the pantograph support 73 is expanded and contracted by the expansion and contraction cylinder 74 so that it can be moved up and down.

Therefore, even if the size of the tire T is large or small, the tire supporter 4 can be moved up and down so that the tire support 4 can be inserted into or removed from the rim mounting hole R.

Further, 75 and 76 are buff ducts for sucking dust generated in the buff.

Further, in FIG. 2, reference numeral 77 denotes a control box for remotely controlling the motors 10, 25, 47, the telescopic cylinders 7, 55, etc. In this case, the motors 10, 25, 27 can be varied in speed, for example. As a CAD motor, the rotation speed of the buff rotating bodies 19 and 20, the rotation speed of the tire support 4, and the buff rotating bodies 19 and 2
The buff finish according to the type of the tire T is possible by controlling the slight speed rocking of 0 and the like.

(Effects of the Invention) The present invention is as described above, and a tire having a ground contact surface to be buffed vertically is scooped up and supported by a tire support and rotated, and a buff rotating body is attached to the ground contact surface to be buffed. Since it is rotated while pressing, it reciprocates in the meridian direction following the outer contour of the ground contact surface to buff,
It does not cause damage to the tire body that is likely to occur when buffing until the residual groove is eliminated with the main buffing machine, and the pressing force can be controlled to a constant value compared to when buffing the residual groove by hand, and a uniform buffing is possible. Finishing is possible, there is no risk of damaging the tire body, and the efficiency of buffing can be greatly improved.

Therefore, according to the present invention, it is possible to obtain a uniform retreaded tire, and it is particularly useful when applied to a snow tire, a tire with a lug or the like.

[Brief description of drawings]

Drawing shows an embodiment of the present invention, FIG. 1 is a front perspective view, FIG. 2 is a left side view, FIG. 3 is a right side view, and FIG. 4 is a plan view.
FIG. 5 is an enlarged front view showing the tire scooping support together with the operation, FIG. 6 is a side view showing the elevating and oscillating portion of the buff rotating body, and FIGS. Front view, FIG. 8 is a side view showing tire support and rotation, FIG. 9 is a plan view showing a part of a buff portion, FIG. 10 is a side view of a lifting / lowering transmission part by a crank arm and a crank rod, and FIG. Is an operation explanatory view showing a buffing state, and FIG. 12 is a perspective view of a part of the tire. 4 ... Tire support, 7 ... Tire rake cylinder,
15 …… Tire rotation transmission means, 19,20 …… Buff rotating body,
21,22 …… Buff rotation transmission means, 23,24 …… Buff reciprocating means.

Claims (2)

[Claims] 1. A method of supplementarily buffing a ground contact surface S of a worn tire (T) with a buff rotating body (19) (20), wherein the tire (T) placed vertically is Support (4)
The pair of buff rotating bodies (19) and (20) are scooped up and rotated by pressing the left and right buff rotating bodies (19) and (20) against the ground contact surface S and rotating, and reciprocate along the meridian direction at the symmetrical position of the tire equator line to buff. Auxiliary buff method for retreaded tires. 2. An auxiliary buffing device for auxiliaryly buffing a ground contact surface S of a worn tire (T) with a buffing rotary body (19) (20), the axis of the tire (T) being vertically installed. A tire support (4) having a length extending over a pair of left and right tire bead portions (B1) (B2) is provided on one side in the axial direction so that it can be inserted into and removed from the rim mounting hole (R) and can move up and down. A transmission means (15) for rotating and driving the tire support (4) is provided, and the tire support (4) is inserted into the rim mounting hole (R) and raised to contact the tire (T) being lifted. A pair of left and right buff rotating bodies (19) (20) are provided at positions corresponding to the ground S, and the buff rotating bodies (19) (20)
Transmission means for rotating each of the
And buff reciprocating means (23) (24) for pressing the buff rotating body (19) (20) against the ground contact surface S and reciprocating in the meridian direction at the symmetrical position of the tire equator line following the ground contact surface S. An auxiliary buffing device for retreaded tires that is characterized by