JPH0641184B2 - Tire building equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a molding apparatus for an automobile tire, and is capable of automatically measuring an overlap margin of both end joints of a belt-shaped member wound around a molding drum thereof. It is the one.

(Prior Art) In a manufacturing process of an automobile tire, various belt-shaped members mainly made of rubber are cut into a predetermined length, and both ends thereof are joined to each other to form a multi-layered ring or cylinder. For example, in a primary forming machine, an inner liner (rubber band) cut into its peripheral length and a plurality of ply cords (rubbered fiber cord or steel cord) are laminated around a molding drum. . Further, in the secondary molding machine, two steel belts (rubbered steel cords), cap plies (rubbered nylon cords) and the like are laminated. Then, these strip-shaped members are joined endlessly by stacking the rubber portions of the winding start end and the winding end end one by one, and the above strip-shaped members are cut into a predetermined length and then left standing. It has the property of shrinking in a state, and the amount of shrinkage varies depending on the environment, and its length changes due to the external force applied when these belt-shaped members transfer from the conveyor belt to the forming drum. Even if it was cut into long pieces, there was variation in the overlap margin at the joints at both ends. Therefore,
Conventionally, when the overlap margin is too large, the worker removes the rubber or cord at the end of the winding end, and conversely, when there is no overlap margin and a gap is created between the ends, the band member is partially rewound. I was rewinding this while stretching it.

(Problems to be Solved by the Invention) However, with the recent progress in automation of tire molding, a conventional tire molding machine is provided with a means for inspecting the joining state of both ends of the belt-shaped member. Since there was no such thing, there was a risk that the above-mentioned excessively large or smallly overlapped products would be directly commercialized.

The present invention provides a tire molding machine capable of detecting the excess or deficiency of the overlapping margin while winding the belt-shaped member around the molding drum of the primary molding machine or the secondary molding machine.

(Means for Solving the Problem) A tire molding apparatus of the present invention supplies a molding drum for endlessly winding a belt-shaped member of a predetermined length that constitutes an automobile tire, and the belt-shaped member to the molding drum. In a tire forming apparatus having a transport belt for, an end detector for detecting a winding start end and a winding end end of the belt-shaped member transferred from the above-mentioned transport belt to the molding drum, and this end. Based on the rotation angle and diameter of the molding drum, which measures the angle at which the molding drum rotates between the output of the winding start signal and the output of the winding end signal in response to the output signal of the section detector. It is characterized in that an arithmetic device for calculating the overlap margin of the winding start end and the winding end end of the strip-shaped member is provided. It should be noted that the above-mentioned end portion detector may be configured to detect both the winding start end portion and the winding end end portion of the belt-shaped member, and one end detector may be installed at an arbitrary angle in the circumferential direction of the forming drum. However, the winding start end may be detected on the one hand, and the winding end end may be detected on the other hand.

(Operation) When the conveyor belt and the molding drum are driven, the belt-shaped member on the conveyor belt is supplied to the molding drum, and the belt-shaped member is wound around the molding drum. At that time, the belt-shaped member is wound by the end detector. The angular positions of the starting end and the winding end are detected, and the rotation angle of the forming drum required for winding the band-shaped member is measured by the angle detector based on this angular position. Based on the diameter, the overlap margin at both ends of the belt-shaped member is calculated by the arithmetic unit. Therefore, by setting the allowable range of the overlap margin in advance, if the overlap margin is within the allowable range,
The molding operation is continued as it is, and when the overlap margin is out of the allowable range, the molding operation can be stopped or an alarm can be issued. Further, the edge detectors can be provided at a plurality of positions in the width direction, for example, at three positions in the center and left and right to improve the accuracy. In addition, since one strip-shaped member itself has a seam of material in the middle, and this seam portion may form a step, a certain range before and after the winding start end, for example, 5
By operating the end detector for the end of winding only in the range of mm, it is possible to prevent the seam portion from being erroneously detected as the end of winding and detected.

(Example) In FIG. 1, A is a belt-shaped member, 1 is a forming drum, 2 is a conveyor belt, 3 is a belt pulley, and the forming drum 1 is
And the conveyor belt 2 rotates in the direction of the arrow, and the belt-shaped member A on the conveyor belt 2 is wound around the forming drum 1.

A first end detector 5 and a second end detector 6 are provided on the advance side of the molding drum 1 in the rotation direction from a point P at which the belt-shaped member A starts to contact the molding drum 1. These edge detectors 5 and 6 are composed of photoelectric elements and photoelectrically act as the strip-shaped member A.
Is to detect the end of the. Also, the molding drum 1
Further, the angle detector 10 is connected via the toothed pulley 7, the toothed belt 8 and the toothed pulley 9 which are coaxial with this. Then, the output ends of the first end detector 5, the second end detector 6 and the angle detector 10 are connected to an arithmetic unit 11 for calculating the overlap margin of both ends of the strip A. It

In the above structure, when the molding drum 1 and the conveyor belt 2 are driven to wind the strip-shaped member A around the molding drum 1,
When the winding start end portion Aa of the strip-shaped member A reaches the first end portion detector 5, the angle detector 10 starts operating, and then the winding start end portion Aa reaches the second end portion detector 6. At this time, the rotation angle of the molding drum 1 from the detection of the winding start end Aa by the first end detector 5 to the detection of the second end detector 6 is measured. Based on this, the angle θ ₀ (degree) from the second end detector 6 to the first end detector 5 is calculated and stored in the arithmetic unit 11, and the angle detector 10 is also stored.
Is reset to zero. Next, when the first end detector 5 detects the winding end end Ab of the strip-shaped member A (see FIGS. 2 and 3), the molding drum 1 is stopped, and the rotation angles θ ₁ and θ _{2 between them.} (Degree) is measured.

FIG. 2 shows that an end detector 5 having a rotation angle θ ₁ (degrees) of 2,
6 is larger than the angle θ ₀ , and the end portion Aa of the strip member A,
The case where Abs overlap is shown, and the overlapping margin X in this case is given by the following equation, where D is the diameter of the molding drum 1 and t is the thickness of the belt-shaped member A. Which is calculated by the arithmetic unit 11.

Further, FIG. 3 shows a case where the rotation angle θ ₂ (degrees) is smaller than the angle θ ₀ between the two end portion detectors 5 and 6, and the end portions Aa and Ab of the strip-shaped member A are separated. The gap Y in this case is
When the diameter of the molding drum 1 is D and the thickness of the strip-shaped member A is t, Which is calculated by the arithmetic unit 11.

Although the above embodiment is an example in which two end detectors 5 and 6 are installed, the second end detector 6 in FIG. 1 is omitted and only the first end detector 5 is used. You may measure the angle which makes an almost one round. However, when two pieces are used as described above, a change in length between the end detectors 5 and 6 can be ignored, and more accurate measurement can be performed. When laminating the second and subsequent belt-shaped members, the thickness of the wound belt-shaped member A is added to the diameter D of the molding drum 1.

(Effect of the Invention) Since the present invention is designed to automatically measure the size (including positive and negative) of the overlap margin of the strip-shaped member wound on the forming drum at the same time as the winding is completed, If the overlap margin is too large or too small, this can be eliminated by setting. Therefore, in automating the molding operation of the automobile tire, it is possible to prevent the above-mentioned defective stacking margin from being commercialized.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 and FIG.
The figure is a side view of the forming drum for explaining the operation. A: band-shaped member, Aa: winding start end, Ab: winding end, 1: forming drum, 2: conveyor belt, 5, 6: end detector, 7, 9: toothed pulley, 8: tooth Belt with 1
0: angle detector, 11: arithmetic unit.

Claims (1)

[Claims] 1. A tire molding apparatus comprising a molding drum for endlessly winding a belt-shaped member having a predetermined length which constitutes an automobile tire, and a conveyor belt for supplying the belt-shaped member to the molding drum. In, an end detector for detecting the winding start end and the winding end end of the belt-shaped member transferred from the above-mentioned transport belt to the forming drum, and a winding start signal in response to the output signal of this end detector. Angle detector for measuring the angle of rotation of the forming drum between the output of the winding end signal and the output of the winding end signal, and the winding start end and winding end end of the strip-shaped member based on the rotation angle and diameter of the forming drum. A tire forming apparatus, which is provided with an arithmetic unit for calculating an overlap margin of parts.