Device and method for manufacturing multiple layer rubber strip

Patent metadata

Field	Value
Publication number	US-10894396-B2
Application number	US-201816133885-A
Country	US
Kind code	B2
Filing date	Sep 18, 2018
Priority date	Oct 12, 2017
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

A device for manufacturing a multiple layer rubber strip including a first rubber strip and a second rubber strip, the device includes a first rubber extruder for extruding the first rubber strip, a second rubber extruder for extruding the second rubber strip, a first conveyor for conveying the first rubber strip extruded from the first extruder to a downstream side in a convey direction, and a second conveyor for conveying the second rubber strip extruded from the second extruder to a downstream side in the convey direction. The second conveyor is located upwardly of the first conveyor and has a downstream conveyor end which positions above a conveying surface of the first conveyor such that the second rubber strip delivered from the downstream conveyor end meets and overlaps the first rubber strip on the first conveyor at a joining location to form the single multiple layer rubber strip.

First claim

What is claimed is:

1. A device for manufacturing a multiple layer rubber strip comprising at least a first rubber strip and a second rubber strip, the device comprising:
a first rubber extruder for extruding the first rubber strip, the first rubber strip having a first upper surface oriented to form an acute angle with a first lower surface;
a second rubber extruder for extruding the second rubber strip, the second rubber strip having a second upper surface oriented to form an acute angle with a second lower surface;
a first conveyor for conveying the first rubber strip extruded from the first extruder to a downstream side in a conveying direction, wherein the first conveyor has a conveying surface on which the first rubber strip is carried; and
a second conveyor for conveying the second rubber strip extruded from the second extruder to a downstream side in the conveying direction, the second conveyor located upwardly of the first conveyor and having a downstream conveyor end in the conveying direction,
wherein the downstream conveyor end of the second conveyor is positioned above the conveying surface of the first conveyor such that the second rubber strip is delivered from the downstream conveyor end of the second conveyor to meet and overlap the first rubber strip on the first conveyor at a joining location to form the multiple layer rubber strip,
wherein the conveying surface extending in the conveying direction of the first conveyor is inclined with respect to a conveying surface extending in the conveying direction of the second conveyor, and
wherein an angle θ between the conveying surface of the first conveyor and the conveying surface of the second conveyor is from 20 to 30 degrees.

2. The device according to claim 1 , further comprising a pressing device to press the first rubber strip and the second rubber strip of the multiple layer rubber strip with each other, wherein the pressing device is located on a downstream side in the convey direction of the joining location.

3. The device according to claim 2 , further comprising a third conveyor located on a downstream side of the first conveyor in the conveying direction such that the multiple layer rubber strip on the first conveyor is transferred to the third conveyer, wherein the pressing device is located between the first conveyor and the third conveyor.

4. The device according to claim 1 , wherein each of the first and second rubber extruders comprises a gear pump on an extruding end side thereof.

5. The device according to claim 1 , further comprising a first festoon accumulator located between the first rubber extruder and the first conveyor, and a second festoon accumulator located between the second rubber extruder and the second conveyor.

6. The device according to claim 1 , further comprising a speed controller that varies an extruding speed of the first rubber extruder based on a conveying speed of the first conveyor and that varies an extruding speed of the second rubber extruder based on a conveying speed of the second conveyor.

7. The device according to claim 1 , wherein the multiple layer rubber strip is for a bead apex rubber strip which is to be disposed on a radially outer surface of a circular bead core of a tire.

8. The device according to claim 1 , wherein the second lower surface of the second rubber strip is delivered from the downstream conveyor end of the second conveyor to meet and overlap the first upper surface of the first rubber strip at the joining location.

9. The device according to claim 1 , wherein a width in a cross-section of the first rubber strip is greater than that of the second rubber strip.

10. A device for manufacturing a multiple layer rubber strip comprising at least a first rubber strip and a second rubber strip, the device comprising:
a first rubber extruder for extruding the first rubber strip, the first rubber strip having a first upper surface oriented to form an acute angle with a first lower surface;
a second rubber extruder for extruding the second rubber strip, the second rubber strip having a second upper surface oriented to form an acute angle with a second lower surface;
a first conveyor for conveying the first rubber strip extruded from the first extruder to a downstream side in a conveying direction, wherein the first conveyor has a conveying surface on which the first rubber strip is carried;
a second conveyor for conveying the second rubber strip extruded from the second extruder to a downstream side in the conveying direction, the second conveyor located upwardly of the first conveyor and having a downstream conveyor end in the conveying direction,
wherein the downstream conveyor end of the second conveyor is positioned above the conveying surface of the first conveyor such that the second rubber strip is delivered from the downstream conveyor end of the second conveyor to meet and overlap the first rubber strip on the first conveyor at a joining location to form the multiple layer rubber strip, and
wherein the multiple layer rubber strip is for a bead apex rubber strip which is to be disposed on a radially outer surface of a circular bead core of a tire, and
a cutter for cutting the multiple layer rubber strip to obtain bead apex rubber strips sequentially such that each of the bead apex rubber strips has a circumferentially extending first side thereof being longer than a circumferentially extending second side thereof, wherein the second side of each of the bead apex rubber strips is to be arranged on the radially outer surface of the bead core.

11. The device according to claim 10 , wherein the cutter cuts the multiple layer rubber strip in such a manner as to cut away an independent triangle or trapezoid shaped piece from between adjacent bead apex rubber strips.

12. The device according to claim 10 , wherein the conveying surface extending in the conveying direction of the first conveyor is inclined with respect to a conveying surface extending in the conveying direction of the second conveyor.

13. The device according to claim 12 , wherein an angle θ between the conveying surface of the first conveyor and the conveying surface of the second conveyor is from 20 to 30 degrees.

14. A method for manufacturing a multiple layer rubber strip in the device according to claim 1 , the method comprising:
forming the first rubber strip with the first upper surface being oriented to form an acute angle with the first lower surface;
forming the second rubber strip with the second upper surface being oriented to form an acute angle with a second lower surface;
applying the second rubber strip onto the first rubber strip; and
forming a multiple layer rubber strip by joining at least the first rubber strip and the second rubber strip together.

15. The method according to claim 14 , wherein, in the applying, when the second rubber strip is in contact with the first rubber strip, the second rubber strip is twisted so that an entire second lower surface of second rubber strip comes into contact with the first upper surface of the first rubber strip.

16. A device for manufacturing a multiple layer rubber strip comprising at least a first rubber strip and a second rubber strip, the device comprising:
a first rubber extruder for extruding the first rubber strip, the first rubber strip having a first upper surface oriented to form an acute angle with a first lower surface;
a second rubber extruder for extruding the second rubber strip, the second rubber strip having a second upper surface oriented to form an acute angle with a second lower surface;
a first conveyor for conveyin

Assignees

• Sumitomo Rubber Ind

Inventors

• Onimatsu Hiroyuki
• Kubota Kaoru
• Suzuki Kazuya
• Igarashi Makoto

Classifications

• B29D30/42 Primary

  Endless textile bands without bead-rings · CPC title

• B29D30/48 Primary

  Bead-rings or bead-cores (from wire B21F37/00); Treatment thereof prior to building the tyre · CPC title

• B29D2030/241

  Auxiliary drums used for temporary storage of the layers before application to the building drums · CPC title

• B32B37/153 Primary

  at least one layer is extruded and immediately laminated while in semi-molten state · CPC title

• B29D2030/486

  Additional components for the tyre bead areas, e.g. cushioning elements, chafers, flippers · CPC title