JPH06320627A - Belt-form rubber member joining method - Google Patents

Abstract

PURPOSE:To facilitate management and storage of an ultrasonic vibrator and obtain a small-size and low-cost joining device. CONSTITUTION:One end face 13 and the other end face 14 are joined to each other by moving a vibrator 24 along an overlap part 15. Therefore, the same vibrator 24 of a simple shape can be used for a different kind of a belt-form rubber member 12. As a result, a production cost is lowered, and the vibrator can be simply managed and stored. Additionally, because the full area of the overlap part 15 is joined by moving the vibrator 24, the area to be joined at a time is small. As a result, an ultrasonic wave generator of a small capacity can be sufficiently used, and a joining device 18 can be wholly reduced in size and lowered in cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining one end surface and the other end surface of a belt-shaped rubber member which are inclined to each other in a state of surface contact.

[0002]

2. Description of the Related Art Conventionally, as a method for joining a band-shaped rubber member using an ultrasonic vibrator, for example, US Pat.
Those described in Japanese Patent No. 19 are known. This one has one end face inclined with respect to the surface so that the thickness becomes thinner toward one end, and the other end face inclined parallel to the one end face so as to become thinner toward the other end. After the one end and the other end of the strip-shaped rubber member are brought into surface contact with each other and the one end and the other end of the strip-shaped rubber member are overlapped with each other, the contact surface that comes into contact with the strip-shaped rubber member has a dent having substantially the same cross-sectional shape The vibrator which is formed and extends over substantially the entire width of the belt-shaped rubber member is pressed against the overlapping portion while ultrasonically vibrating, so that one end surface and the other end surface of the belt-shaped member are joined.

[0003]

However, in such a conventional joining method for the band-shaped rubber member, the ultrasonic vibrator is a general shape, that is, the band-shaped rubber member is provided on the contact surface contacting the band-shaped rubber member. Since a recess having substantially the same shape as the cross-sectional shape of the belt-shaped rubber member is formed and extends over almost the entire width of the belt-shaped rubber member, an ultrasonic transducer having a different shape must be manufactured for each type of the belt-shaped rubber member. As a result, there is a problem that the manufacturing cost becomes high and the management and storage are troublesome. In addition, since the entire overlapping portion is joined together, a large-capacity ultrasonic wave generator is required, and there is a problem that the entire joining device becomes large and expensive.

It is an object of the present invention to provide a method for joining belt-shaped rubber members, which makes it easy to manage and store the ultrasonic vibrator, and also makes the apparatus small and inexpensive.

[0005]

The object is to have one end face inclined with respect to the surface so that the wall thickness becomes thinner toward one end, and the wall thickness becomes thinner toward the other end. A step of superposing one end portion and the other end portion of the belt-shaped rubber member having the other end surface inclined parallel to the end surface while making one end surface and the other end surface contact with each other; The step of moving the belt-shaped rubber member in the substantially width direction along the overlapping portion while pressing it against the overlapping portion to join the one end surface and the other end surface of the belt-shaped rubber member can be achieved.

[0006]

When joining the one end and the other end of the strip-shaped rubber member, first, the inclined one end face of the strip-shaped rubber member is brought into surface contact with the other end face inclined so as to be parallel to the one end face. In this state, the one end and the other end are overlapped. Next, while the ultrasonically vibrating vibrator is being pressed against the overlapping portion, the vibrator is moved along the overlapping portion in the substantially width direction of the strip-shaped rubber member. At this time, between the vibrator and the belt-shaped rubber member,
Friction heat is generated between the one end surface and the other end surface of the belt-shaped rubber member, and heat is generated due to friction between rubber molecules in the belt-shaped rubber member, so that the temperature at the overlapping portion rises and Since the overlapping portion where the temperature has risen is pressed by the vibrator as described above, one end surface and the other end surface of the belt-shaped rubber member are strongly bonded. And
By moving the vibrator in the substantially width direction of the belt-shaped rubber member along the overlapping portion, the one end surface and the other end surface of the belt-shaped rubber member are joined over the entire region. Since the vibrators are joined by moving them along the overlapping portion in this way, the vibrators may have a simple shape even if the types of the rubber band members are different. As a result, Manufacturing costs are low, and management and storage are easy. Moreover, since the transducer is moved to bond the entire region, the range of bonding at one time is narrow, and as a result, a small-capacity ultrasonic generator is sufficient, and the bonding device is compact and inexpensive. Can also be

Further, according to the second and third aspects, when the thickness of the belt-shaped rubber member is different depending on the place, ultrasonic energy corresponding to the thickness can be applied from the vibrator. Therefore, the bonding strength can be made uniform in each part. Further, according to the fourth aspect, it is possible to prevent the band-shaped rubber member from being deformed and wrinkled due to the sliding contact of the vibrator.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First embodiment of the apparatus for carrying out the present invention
An embodiment will be described with reference to the drawings. 1 and 2,
11 is a molding drum whose diameter can be expanded / contracted.
Rotates about a horizontal axis. A belt-shaped rubber member 12, for example, an inner liner is wound around the outer periphery of the molding drum 11 for one round. One end face 13 and the other end face 14 of the one end in the longitudinal direction and the other end in the longitudinal direction are in surface contact with each other. It is piled up in the state. Here, the one end surface 13 is a belt-shaped rubber member.
The surface 12a of 12 is inclined so as to be gradually separated from the surface 12a toward the one end, and as a result, one end portion of the belt-shaped rubber member 12 is thinned toward the one end. The other end surface 14 is the surface 12a of the belt-shaped rubber member 12.
With respect to the other end, it is inclined so as to gradually approach the surface 12a toward the other end, and as a result, the other end of the belt-shaped rubber member 12 also becomes thinner toward the other end. And
Since the inclination angles of the one end face 13 and the other end face 14 with respect to the surface 12a are the same, the one end face 13 and the other end face 14 extend in parallel with each other, whereby one end and the other end of the strip-shaped member 12 are formed. The thickness of the overlapping portion 15 where and overlap with each other is the same as the thickness of other portions of the belt-shaped rubber member 12.

Reference numeral 18 denotes a joining device, and the joining device 18 has a power supply 19 attached to a fixed frame (not shown), and the power supply 19 converts a commercial power source into a high frequency power source. 20 is an ultrasonic stack connected to a moving frame (not shown).
Reference numeral 20 denotes the overlapping portion immediately above the overlapping portion 15.
It is arranged at an angle to 15. The ultrasonic stack 20 has a converter 22 connected to the power supply 19 via a cord 21, and the converter 22 has a built-in piezoelectric element for power supply 19.
Converts the high-frequency power supplied from the unit into high-frequency mechanical vibration of approximately 40 kHz. A booster 23 is connected to the converter 22, and the booster 23 amplifies the high frequency vibration generated by the converter 22 by resonance. Reference numeral 24 is a vibrator that is connected to the booster 23 and emits ultrasonic waves by vibrating at a high frequency. The vibrator 24 is an air cylinder (not shown) attached to the moving frame, and the overlapping portion 15 is applied with a predetermined force. The ultrasonic vibration is transmitted to the overlapping portion 15 by being pressed against. This oscillator
The surface of 24 is plated with nickel, chromium, etc. so as to be smooth. Converter 22 and booster mentioned above
23 and the transducer 24 constitute the ultrasonic stack 20 as a whole. Further, a pressing roller 27 in the form of a spur gear is rotatably supported on a moving frame forward of the ultrasonic stack 20 in the traveling direction, and the pressing roller 27 presses the overlapping portion 15 against the forming drum 11 before joining. End face 13 and other end face 14
Are temporarily joined to prevent deformation and wrinkles of the belt-shaped rubber member 12 due to the sliding contact of the vibrator 24.

Next, the operation of the first embodiment of the present invention will be described. First, the belt-shaped rubber member 12 is supplied to the rotating molding drum 11, and the belt-shaped rubber member 12 is attached to the periphery of the molding drum 11 for one round. At this time, the belt-shaped rubber member 12
The one end in the longitudinal direction and the other end in the longitudinal direction of the molding drum 11 are overlapped with each other with one end face 13 and the other end face 14 in surface contact with each other.
An overlapping portion 15 extending in the axial direction of is formed. Next, one end of the overlapping portion 15 in the width direction is pressed against the forming drum 11 by the pressing roller 27. Next, when the moving frame is moved along the axis of the forming drum 11, the pressing roller 27
The overlapping portion 15 is pressed against the molding drum 11 prior to joining to temporarily join the one end surface 13 and the other end surface 14 together, thereby preventing the belt-shaped rubber member 12 from being deformed, wrinkled, or the like due to the sliding contact of the vibrator 24. At this time, a high-frequency power source is sent from the power supply 19 to the converter 22 via the cord 21 to generate high-frequency (ultrasonic) vibration in the converter 22. After this vibration is sent from the converter 22 to the booster 23 and amplified,
The oscillator 24 is sent to the oscillator 24 and ultrasonically vibrates. Then, when the vibrator 24 moves to one end in the width direction of the overlapping portion 15 due to the movement of the moving frame, the vibrator 24 is pressed against the overlapping portion 15 with a predetermined force by the air cylinder. As a result, ultrasonic vibration is transmitted from the vibrator 24 to the belt-shaped rubber member 12 of the overlapping portion 15, between the vibrator 24 and the belt-shaped rubber member 12, between the one end surface 13 and the other end surface 14 of the belt-shaped rubber member 12. Further, frictional heat is further generated between the belt-shaped rubber member 12 and the molding drum 11, and heat is generated due to friction between rubber molecules in the belt-shaped rubber member 12, which causes the overlapping portion.
The temperature at 15 rises. At this time, since the overlapping portion 15 whose temperature has risen is pressed against the molding drum 11 by the vibrator 24 with a predetermined force as described above, the one end surface 13 and the other end surface 14 of the belt-shaped rubber member 12 are strongly pressed. To be joined.
Then, when the vibrator 24 moves along the overlapping portion 15 in the substantially width direction of the belt-shaped rubber member 12 to the other end in the width direction, the one end surface 13 and the other end surface 14 of the belt-shaped rubber member 12 cover the entire region. To be joined. At this time, the surface 12a of the belt-shaped rubber member 12
The boundary between the one end surface 13 and the other end surface 14 at is disappeared to the extent that it is almost invisible when the surface rubber is ground by the vibrator 24.

Since the one end face 13 and the other end face 14 are joined by moving the vibrator 24 along the overlapping portion 15 as described above, even if the type of the belt-shaped rubber member 12 is different, 24 can be one simple shape, which results in lower manufacturing costs and easier management and storage. Moreover, since the transducer 24 is moved to bond the entire region of the overlapping portion 15, the range of bonding at one time is narrow, and as a result, a small-capacity ultrasonic generator is sufficient, and the bonding device 18 It is also possible to make the whole small and inexpensive.

Further, when the wall thickness t of the overlapping portion 15 is different depending on the position in the width direction as shown in FIG. 3, in order to make the bonding strength uniform in each portion, for example, the vibrator 24 is moved. By changing the speed, ultrasonic energy corresponding to the wall thickness t is applied from the vibrator 24 to the belt-shaped rubber member 12. That is, the moving speed of the vibrator 24 when the overlapping portion 15 having a large wall thickness t is joined is smaller than the moving speed of the vibrator 24 when the overlapping portion 15 having a thin wall thickness t is joined. And For example, the vibrator 24 is moved at 20 mm / sec in the thick portion 15a having the thickness t of 9.2 mm, and the vibrator 24 is moved at 80 mm / sec in the thin portion 15b having the thickness t of 4.6 mm. In the thick portion between them, the moving speed is gradually changed between the above values. The output at this time was 800 w, the frequency was 40 kHz, and the pressing force was 3 kg. In addition, when the thickness t of the overlapping portion 15 differs depending on the position in the width direction, in order to make the bonding strength uniform in each portion, not the frequency of the vibrator 24 but the output to the vibrator 24 should be changed. The amplitude of the vibrator 24 may be changed according to. In this case, the amplitude of the vibrator 24 when the superposed portion 15 having a large wall thickness t is joined is calculated as the vibration of the vibrator 24 when the superposed portion 15 having a thin wall thickness t is joined.
Greater than 24 amplitudes.

4 and 5 are views showing a second embodiment of the apparatus for carrying out the present invention, and this embodiment will be briefly described below. In this embodiment, first, an inner liner (belt-shaped rubber member) 31 is attached to the outer periphery of the band forming drum 30.
Is supplied and pasted for one lap, and then the chafer 32 is pasted to both outer ends in the width direction of the inner liner 31, and then,
A ply 33 having a cord embedded inside is attached to the outer side of the inner liner 31 and the chafer 32 to form a cylindrical band 34. Next, after the band 34 is gripped from the outer periphery by the plurality of grippers 37 of the transfer device 36, the band 34
The transfer device 36 holding the is moved to the vicinity of the tire building drum 38. Next, the joining device 39 is lowered to the band forming drum.
After loading between 30 and tire building drum 38, transfer device
36 is moved to the joining device 39. This allows the joining device
The support beam 41 for supporting the moving frame 40 of 39 is inserted into the band 34 immediately above the overlapping portion 42 of the inner liner 31, while the receiving beam 43 that receives the overlapping portion 42 of the band 34 from below is provided in the overlapping portion 42. It is moved to just below. Next, the moving frame 40 is moved to move the pressing roller 46.
By temporarily joining the overlapping portion 42 prior to joining, and pressing the overlapping portion 42 with a predetermined force while ultrasonically vibrating the transducer 45 of the ultrasonic stack 44 to join the one end surface and the other end surface of the inner liner 31. To do. Next, the transfer device 36 that holds the band 34 that has been joined is transferred to the tire forming drum 38, and the band 34 is transferred from the transfer device 36 to the tire forming drum 38. At this time, the joining device 39 is raised to the initial position. By doing so, in the band 34 in which the belt-shaped rubber member (inner liner) 31 is attached to the innermost periphery, one end surface and the other end surface of the belt-shaped rubber member 31 can be joined from the inner peripheral side of the band 34. it can.

In the above-described embodiment, the spur gear-shaped pressing roller 27 is used to press the one end surface 13 and the other end surface 14 of the belt-shaped rubber member 12 for temporary joining prior to joining. In the invention, the pressing roller may have a cylindrical shape or a cylindrical shape. Further, in the present invention, what is provided directly below the belt-shaped rubber member 12 may be a flat plate instead of the cylindrical molding drum 11. Further, in the present invention, the molding drum
11. If a large number of air suction ports are formed on the surface of the plate in contact with the belt-shaped rubber member 12 and one end and the other end of the belt-shaped rubber member 12 are adsorbed and their movement and deformation are restricted, It does not have to be. Further, in the above-described embodiment, one end surface 13 and the other end surface 14 of one band-shaped rubber member 31 are joined to form an endless band, but in the present invention, one end surface of a band-shaped rubber member 31 is formed. Alternatively, the other end surface may be joined to the other end surface or one end surface of the belt-shaped rubber member subsequent thereto to form a continuous long belt-shaped member.

[0015]

As described above, according to the present invention, it becomes easy to manage and store the ultrasonic transducer, and
The device can be small and inexpensive.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of an apparatus for carrying out the present invention.

FIG. 2 is a partially cutaway perspective view near an ultrasonic stack.

FIG. 3 is a cross-sectional view when joining band-shaped rubber members having varying thicknesses.

FIG. 4 is a schematic perspective view showing a second embodiment of the device for carrying out the present invention.

FIG. 5 is a partially cutaway perspective view near an ultrasonic stack.

[Explanation of symbols]

 12 ... Belt-shaped rubber member 12a ... Surface 13 ... One end surface 14 ... Other end surface 15 ... Overlap portion 24 ... Transducer 27 ... Presser roller

Claims (4)

[Claims] 1. An end surface inclined toward the surface so that the thickness decreases toward one end, and the other end surface inclined parallel to the one end surface such that the thickness decreases toward the other end. A step of superimposing one end and the other end of the belt-shaped rubber member having the one end surface and the other end surface in surface contact with each other, and an overlapping part while pressing the ultrasonically vibrating vibrator against the overlapping part. And a step of joining the one end surface and the other end surface of the strip-shaped rubber member by moving the strip-shaped rubber member in a substantially width direction along the strip-shaped rubber member. 2. The moving speed of the vibrator when the thick overlapping portion is joined is smaller than the moving speed of the vibrator when joining the thin overlapping portion. Item 2. A method for joining belt-shaped rubber members according to Item 1. 3. The amplitude of the vibrator when the thick overlapping portion is joined is made larger than the amplitude of the vibrator when the thin overlapping portion is joined. A method for joining band-shaped rubber members as described above. 4. The method for joining strip-shaped rubber members according to claim 1, wherein the overlapping portion is pressed by a pressing roller prior to joining by the vibrator, and the one end surface and the other end surface are temporarily joined.