JP2013022871A - Apparatus and method for sticking of rubber strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and method for sticking of a rubber strip, capable of stably and continuously sticking the rubber strip with high accuracy without increasing a worker's burden, even when a peripheral length changes greatly depending on the axial position of a former.SOLUTION: The rubber strip sticking apparatus includes a control system for controlling the supply amount of the rubber strip to supply the rubber strip with a certain length from the rubber strip supply conveyor to the former, the certain length of the rubber strip being computed based on the rotating amount of the former detected by a first encoder mounted to the center axis of the former, and on a distance from the center of the former to the tip of a rubber strip supply conveyor, detected by a second encoder built in a moving mechanism for moving the rubber strip supply conveyor in a direction orthogonal to the axial direction of the former. The rubber strip sticking method is carried out using the rubber strip sticking apparatus.

Description

  The present invention relates to a rubber strip sticking apparatus and a sticking method capable of sticking a rubber strip to a former with high accuracy by a strip wind method.

  In the manufacture of pneumatic tires, various rubber members such as tread rubber, sidewall rubber, inner liner rubber and the like are used because required characteristics at each part are different. These rubber members are formed using a strip wind method in which a belt-like rubber material (rubber strip) is continuously wound around a former (drum) in a spiral manner to form a wound body ( For example, Patent Documents 1 to 3).

  FIG. 3 is a view for explaining the strip wind method, wherein (a) is a perspective view showing a wound body formed on a former by winding a rubber strip, and (b) is the wound body. It is a side view explaining the formation method. In FIG. 3, 2 is a rubber strip supply unit, 3 is a former, and 3 a is a wound body formed on the former 3.

  As shown in FIG. 3 (b), the rubber strip supply unit 2 includes a rubber strip supply conveyor 6 for supplying a rubber strip RS to be attached to the former 3, and the rubber strip supply conveyor 6 in a direction perpendicular to the axial direction of the former 3. A first moving mechanism 4 for moving, a second moving mechanism 5 (traverse mechanism) for moving the rubber strip supply conveyor 6 in the axial direction of the former 3, and a rotating mechanism 7 (rotation mechanism) for rotating the rubber strip supply conveyor 6 ). These mechanisms and conveyors are driven by servo motors provided respectively.

  By the first moving mechanism 4, the second moving mechanism 5, and the rotating mechanism 7, the amount of movement of the rubber strip supply conveyor 6 in the direction orthogonal to the axial direction of the former 3 and the movement of the former 3 in the axial direction, respectively. The amount and the rotation angle are controlled, and based on the result, the rubber strip RS is supplied from the rubber strip supply conveyor 6, and the wound body 3 a is formed on the former 3. At this time, if the rotation speed of the former 3 is constant, the surface speed varies depending on the attachment position as shown by the two black arrows in FIG. 3B (specifically, the surface speed decreases as the diameter decreases). Therefore, in order to form a highly accurate wound body 3a, it is necessary to synchronize the amount of rubber strip RS supplied from the rubber strip supply conveyor 6 with the change in the surface speed of the former 3.

  Conventionally, a method in which the pasting speed is set in advance for each round of the former has been employed. Specifically, for example, as shown in FIG. 4, when pasting the former 11 times, a pasting position (radial position) is determined for each of the first to eleventh rounds (preset). The surface speed is obtained by calculating the perimeter of each round, and the rubber strip application speed, that is, the supply speed of the rubber strip by the rubber strip supply conveyor is set accordingly.

JP 2007-136740 A JP 2006-43908 A JP 2006-110856 A

  However, in the above method, as shown in FIG. 5, the circumference is linear for the setting of the pasting speed between the first position of one circumference and the last position (first position of the next circumference). When the circumference changes in a curved line, strictly speaking, the supply speed of the rubber strip supply conveyor can follow the surface speed of the pasting position. Therefore, there is a possibility that a speed difference may occur between the surface speed at the attaching position and the supply speed of the rubber strip supply conveyor.

  In particular, when a sidewall of an SP tire for a motorcycle or a tread of an MC tire is formed by a strip wind method, a former with a large inclination is used, so that a larger speed difference is generated.

  As described above, when the rubber strip is applied in a state where the speed difference is generated, the accuracy of attaching the rubber strip cannot be sufficiently increased, and the performance of the product tire may be adversely affected. .

  As a method of dealing with this problem, instead of the speed setting for each lap described above, for example, by dividing each lap once every time and setting the pasting speed for each divide, the interpolation interval is reduced. Therefore, it is conceivable to perform fine control. However, when this method is adopted, there is a problem that the burden on the operator who sets the pasting speed is greatly increased. For example, if the number of windings is 10 laps, the speed setting for 10 points is sufficient for the conventional speed setting for each lap, whereas 3600 (360 × 10) for the speed setting for each time. It is necessary to set the point and 360 times.

  Therefore, in view of the above-described problems of the prior art, the present invention is capable of attaching a rubber strip with high accuracy without increasing the burden on the operator even when the circumference varies greatly depending on the axial position of the former. It is an object of the present invention to provide a rubber strip sticking device and a sticking method that can be carried out stably and continuously.

The invention described in claim 1
Using a strip winding method, a strip-shaped rubber strip is continuously pasted to a former, and a rubber strip pasting device for forming a wound body,
A first encoder attached to a central axis of the former to detect a rotation amount of the former;
A rubber strip supply conveyor for supplying a rubber strip to the former with a tip close to the former;
A first moving mechanism for moving the rubber strip supply conveyor in a direction perpendicular to the axial direction of the former by driving a servo motor;
A second moving mechanism for moving the rubber strip supply conveyor in the axial direction of the former by driving a servo motor;
A second encoder that is built in a servo motor provided in the first moving mechanism and detects a distance from the center of the former at the rubber strip application position to the tip of the rubber strip supply conveyor;
Further, the amount of rotation corresponds to the amount of rotation based on the amount of rotation of the former detected by the first encoder and the distance from the center of the former detected by the second encoder to the tip of the rubber strip supply conveyor. It has a control system for calculating the required length of the rubber strip and controlling the supply amount of the rubber strip so that the rubber strip having a length corresponding to the calculation result is supplied from the rubber strip supply conveyor to the former. A rubber strip attaching device characterized by the above.

The invention described in claim 2
A rubber strip attaching method for attaching a rubber strip to the former using the rubber strip attaching device according to claim 1,
The control system is control using a sequencer,
The first encoder obtains the angle Δω (rad) of the former changed per one scan of the sequencer, and the second encoder calculates the distance r (mm) from the former center to the tip of the rubber strip supply conveyor. After asking
A rubber strip having a length corresponding to a circumferential length Δωr (mm) that changes per scan of the sequencer determined by the angle Δω and the distance r is supplied from the rubber strip supply conveyor to the former and pasted. This is a characteristic rubber strip application method.

  According to the present invention, even when the circumference varies greatly depending on the position of the former in the axial direction, the rubber strip can be attached stably and continuously without increasing the burden on the operator. A rubber strip sticking device and a sticking method that can be performed can be provided

It is a perspective view which shows typically the structure of the sticking apparatus of the rubber strip of one embodiment of this invention. It is a figure which shows the relationship between the radial position for every scan in one embodiment of this invention, and the radial position along the curved surface of a former | foamer. It is a figure explaining a strip wind system. It is a figure explaining the setting method of the pasting speed of the conventional rubber strip. It is a figure explaining the setting method of the pasting speed of the conventional rubber strip.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

(1) Overall configuration First, the pasting apparatus will be described. FIG. 1 is a perspective view schematically showing a configuration of a pasting apparatus according to the present embodiment. In FIG. 1, 2 is a rubber strip supply unit, 3 is a former, and 3 a is a wound body formed on the former 3. Reference numeral 3b denotes a first encoder that is disposed on the same central axis as the former 3 and detects the rotation amount of the former 3.

  The rubber strip supply unit 2 includes a rubber strip supply conveyor 6 that supplies the rubber strip RS to the former 3, a first moving mechanism 4 that moves the rubber strip supply conveyor 6 in a direction orthogonal to the axial direction of the former 3, rubber A second moving mechanism 5 for moving the strip supply conveyor 6 in the axial direction of the former 3 is provided.

  The rubber strip supply conveyor 6 is driven by a servo motor M3, the first moving mechanism 4 is driven by a servo motor M1, and the second moving mechanism 5 is driven by a servo motor M2. The servo motor M1 incorporates a second encoder (not shown) for detecting the distance from the former center to the tip of the rubber strip supply conveyor at the attaching position.

(2) Attaching the rubber strip The rubber strip RS is attached by driving the second moving mechanism 5 and traversing the rubber strip supply conveyor 6 in accordance with the attaching position while moving the first moving mechanism 4. It drives and controls so that an appropriate space | interval may be maintained between the front-end | tip of the rubber strip supply conveyor 6, and the former 3. FIG. Thereafter, the rubber strip supply conveyor 6 is driven by the servo motor M3, whereby the rubber strip RS having an appropriate length is supplied to the affixing position on the former 3 and affixed.

(3) Control of the supply length of the rubber strip The control of the supply length of the rubber strip RS described above is controlled using a sequencer and is performed as follows.

  First, the position of the tip of the rubber strip supply conveyor 6 is detected by the second encoder built in the servo motor M1, and the distance r (mm) from the center of the former 3 is obtained. It is the pasting position.

  On the other hand, the rotation amount (angle) Δω (rad) of the former 3 changed per scan of the sequencer is obtained by the first encoder 3b.

As a result, the distance at which the surface of the attachment position changes per scan of the sequencer can be expressed as Δωr (mm). By dividing this value by the scan time t, it is possible to approximate the surface speed at the attachment position. That is, the surface speed at the attaching position is obtained by the following equation.
(Surface velocity at the pasting position) ≈ (Δωr / t)

  Next, the rubber strip supply conveyor 6 is driven, and a rubber strip having a length corresponding to the distance Δωr is supplied at a speed of (Δωr / t) and attached to the former 3.

  In this way, the distance at which the surface of the application position changes, that is, the surface speed at the application position, is determined for each scan, and the rubber strip supply speed is controlled to supply the corresponding length of rubber strip. Since the surface speed of the affixing position and the rubber strip supply speed from the rubber strip supply conveyor 6 are synchronized, even if the circumference of the wound body varies greatly depending on the axial position of the former, The rubber strip can be stably and continuously applied with high accuracy without increasing the burden on the user.

  Even if the speed of the former deviates from the setting for some reason, the amount of rotation of the former is monitored by the first encoder, so the surface speed at the affixing position and the rubber from the rubber strip supply conveyor The synchronization with the strip supply speed can be maintained with high accuracy.

  FIG. 2 shows the relationship between the radial position obtained for each scan and the curved surface of the former in this embodiment. In FIG. 2, the vertical axis represents the radial position, the horizontal axis represents the angle of the former, the bar graph represents the radial position obtained for each scan, and the curve represents the curved surface of the former. As shown in FIG. 2, the radial position obtained for each scan well follows the curved surface of the former, and it can be seen that the rubber strip can be attached with high accuracy.

  As described above, according to the present embodiment, even when the circumference varies greatly depending on the position of the former in the axial direction, it is possible to stably attach the rubber strip with high accuracy without increasing the burden on the operator. Thus, it is possible to provide a rubber strip sticking device and a sticking method that can be continuously performed.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

2 Rubber strip supply unit 3 Former 3a Winding body 3b First encoder 4 First moving mechanism 5 Second moving mechanism 6 Rubber strip supply conveyor 7 Rotating mechanisms M1, M2, M3 Servo motor RS Rubber strip

Claims (2)

Using a strip winding method, a strip-shaped rubber strip is continuously pasted to a former, and a rubber strip pasting device for forming a wound body,
A first encoder attached to a central axis of the former to detect a rotation amount of the former;
A rubber strip supply conveyor for supplying a rubber strip to the former with a tip close to the former;
A first moving mechanism for moving the rubber strip supply conveyor in a direction perpendicular to the axial direction of the former by driving a servo motor;
A second moving mechanism for moving the rubber strip supply conveyor in the axial direction of the former by driving a servo motor;
A second encoder that is built in a servo motor provided in the first moving mechanism and detects a distance from the center of the former at the rubber strip application position to the tip of the rubber strip supply conveyor;
Further, the amount of rotation corresponds to the amount of rotation based on the amount of rotation of the former detected by the first encoder and the distance from the center of the former detected by the second encoder to the tip of the rubber strip supply conveyor. It has a control system for calculating the required length of the rubber strip and controlling the supply amount of the rubber strip so that the rubber strip having a length corresponding to the calculation result is supplied from the rubber strip supply conveyor to the former. A device for pasting rubber strips. A rubber strip attaching method for attaching a rubber strip to the former using the rubber strip attaching device according to claim 1,
The control system is control using a sequencer,
The first encoder obtains the angle Δω (rad) of the former changed per one scan of the sequencer, and the second encoder calculates the distance r (mm) from the former center to the tip of the rubber strip supply conveyor. After asking
A rubber strip having a length corresponding to a circumferential length Δωr (mm) that changes per scan of the sequencer determined by the angle Δω and the distance r is supplied from the rubber strip supply conveyor to the former and pasted. A method of attaching a rubber strip as a feature.

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