JPH10156965A - Method and apparatus for laminating unvulcanized rubber sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut a stamped cut part by a rotary driving force of a molding drum and to automatically laminate an unvulcanized rubber sheet by detecting the stamped cut part of the sheet, and clamping upper and lower surfaces of the sheet based on its detection signal. SOLUTION: Belt conveyors 3a, 3b convey and supply an unvulcanized ruber sheet W in a tangential direction of an upper surface of a molding drum 4. A detecting means 7 such as a laser type displacement meter for detecting a stamped cut part of a substantially V-shaped section of the strip-like sheet W in a length corresponding to a perimeter of a molding drum 1 is installed on the conveyor 3b disposed at the drum 4 side. A clamping unit 8 for clamping the sheet W at the rear of the cut part based on a detection signal from the previous means 7 is installed between the conveyors 3a and 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for sticking an unvulcanized rubber sheet, and more particularly to an unvulcanized rubber sheet having a cut portion which has been previously embossed to a length corresponding to the circumference of a forming drum. When attaching a rubber sheet to a molding drum, the embossed cutting section can be cut by the rotational driving force of the molding drum without using a special cutting device, and the unvulcanized rubber sheet can be automatically attached. Also, the present invention relates to a method and an apparatus for attaching an unvulcanized rubber sheet, in which the cycle time is shortened and the working efficiency is remarkably improved.

[0002]

2. Description of the Related Art Conventionally, in a tire manufacturing process, a long unvulcanized rubber sheet such as an inner liner is cut by rotating the forming drum by a predetermined rotation angle, and then adjusting the circumference of the forming drum to a predetermined length. An operator cuts the unvulcanized rubber sheet with a hot knife and press-bonds both ends thereof.

In this joining step, both ends of the cut rubber sheet are joined so that a step is not formed at both ends of the rubber sheet in order to improve uniformity and joining accuracy of the tire. It is also known among those skilled in the art that both ends should be cut obliquely with respect to the thickness direction of the rubber sheet, and the spliced portion (laminated portion) of the rubber sheet should be butt-joined with as few steps as possible. is there.

However, in the case of a conventional blade, the cutting angle β
Is less than 15 °, and lap splicing is performed inevitably to maintain the adhesive strength of the adhesive surface. In cutting the rubber sheet as described above, use a hot knife or a circular cutter,
In order to reduce the level difference of the splice S, the hot knife or the circular cutter is cut at an angle as much as possible, but there is a problem that it is very difficult to cut at an angle of 20 ° or less.

Recently, with the advent of ultrasonic cutters, cutting can be performed at an angle of about 15 °, but if the angle is more than 15 °, the gauge (thickness) of the sheet must be reduced. 8mm or less for 2mm or less
However, there is a problem that it is difficult due to reasons such as cut length accuracy of the sheet, and insufficient bonding strength due to variation and insufficient bonding surface. In general, the thickness of the rubber sheet is 1.0 to 1.2 mm for passenger cars and 1.8 mm to 2.2 mm for trucks.
mm.

Further, as a method of obtaining a low-angle cut surface, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 4-220332, cutting is performed by pressing with a mountain-shaped pressing plate (die) and pressing and cutting. Although a molding method and apparatus have been proposed, pressing in a mountain-shaped pressing plate causes elongation in the longitudinal direction, and after processing or cutting, there was a problem in feeding the leading end of the continuous sheet. .

That is, when the unvulcanized rubber sheet is press-cut (push-cut while being molded), the cut end becomes wrinkled or wakame-like due to residual internal stress after peeling off from a mountain-shaped pressing plate (die). There is a problem that flickering or breakage occurs in the thin portion at the leading end of the subsequent sheet feeding, which adversely affects the splice state later, and furthermore, the leading end of the mountain-shaped portion of the mold is brought into contact with the lower mold. Since the cutting is performed in the state, there is a problem that the release material (Teflon coating or the like) coated on the mold is worn or peeled, and the life is shortened.

[0008]

SUMMARY OF THE INVENTION The present inventors have made an attempt to solve the above-mentioned conventional problems by applying to the Japanese Patent Application No. 6-6 / 1994.
In 5943 (Japanese Patent Application Laid-Open No. Hei 7-276531), when a non-vulcanized rubber sheet is cut, the cut portion of the unvulcanized rubber sheet can be cut when the cut portion is pulled in the pressure molding step without cutting the cut portion. An unvulcanized rubber formed into a thin portion, and then cut and cut by cutting the unvulcanized rubber sheet on the cut side by a roller during the process of transporting the unvulcanized rubber sheet and pulling it with a predetermined tension. A sheet cutting method and apparatus are proposed.

The present invention has been devised in view of such a conventional problem, and is a further improved invention of the above-described invention of the present application. When applying an unvulcanized rubber sheet having a portion to a forming drum, the embossed cutting portion is cut by the rotational driving force of the forming drum without using a special cutting device, and the application of the unvulcanized rubber sheet is automatically performed. Vulcanization that can be carried out in a timely manner, shortens the cycle time, significantly improves work efficiency, is simple in construction and can be manufactured at low cost, and enables automatic bonding of unvulcanized rubber sheets. It is an object of the present invention to provide a method and an apparatus for cutting a rubber sheet.

[0010]

In order to achieve the above object, the present invention provides a raw roll for unwinding a belt-shaped unvulcanized rubber sheet having cut portions embossed at predetermined intervals; A material conveying conveyor was arranged between the rubber sheet and a forming drum provided with fixing means for locking and fixing the starting end, and the unvulcanized rubber sheet was stamped onto the material conveying conveyor near the forming drum. The gist of the invention is to provide a detecting means for detecting a cut portion, and a clamp device behind the detecting means for clamping the upper and lower surfaces of the unvulcanized rubber sheet based on a detection signal from the detecting means.

In the clamp device, a clamp bar having a concave cross-section, at least one of which is capable of approaching / separating, is disposed at a position opposite to the upper and lower sides of the unvulcanized rubber sheet conveyance line. The gist of the present invention is that a sheet peeling member that can appear and disappear from the camera is provided. Further, the material transport conveyor is characterized in that a plurality of material supply conveyors are arranged in series, and the material transport conveyor installed near the forming drum is configured to be able to advance and retreat with respect to the forming drum side. .

The present invention is constituted as described above, and the starting end of the unvulcanized rubber sheet unwound from the raw roll and supplied onto the material supply conveyor is pulled out to the upper surface position of the forming drum and locked there. By rotating the drum by a predetermined rotation angle and detecting the cut portion which has been previously stamped at a length position corresponding to the circumference of the forming drum by the detecting means, based on a detection signal from the detecting means, the rear of the detecting means is detected. The unvulcanized rubber sheet at the rear part of the cut portion which has been embossed is clamped by a clamp device provided in the apparatus. This is a method of sticking an unvulcanized rubber sheet, in which a cut portion of a rubber sheet that has been pressed is cut while being pulled, and an unvulcanized rubber sheet is stuck on a forming drum.

As another method of sticking the unvulcanized rubber sheet, the starting end of the unvulcanized rubber sheet unwound from the raw material roll and supplied onto the material supply conveyor is used to attach the material supply conveyor to the forming drum. When the cutting unit is moved to the center side surface and pressed and locked, the forming drum is rotated by a predetermined rotation angle, and the cutting unit which has been previously pressed to the length position corresponding to the circumferential length of the forming drum is detected by the detecting unit, On the basis of the detection signal from the detection means, the unvulcanized rubber sheet at the rear part of the cut portion pressed by the clamping device provided behind the detection means is clamped. The unvulcanized rubber sheet is cut by pulling the embossed cut portion of the unvulcanized rubber sheet with a fixing means of the vulcanized rubber sheet, and the unvulcanized rubber sheet is stuck on a forming drum.

That is, in the present invention, when an unvulcanized rubber sheet having a cut portion which has been previously embossed to a length corresponding to the peripheral length of the forming drum is attached to the forming drum, the embossed cut portion is specially attached. By cutting with the rotational driving force of the molding drum without using a cutting device, the unvulcanized rubber sheet can be automatically attached, and the cycle time can be shortened to significantly improve the work efficiency. In addition, the structure is simple and can be manufactured at low cost, and the unvulcanized rubber sheet can be automatically attached.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic front view of an apparatus for manually applying and applying an unvulcanized rubber sheet W according to a first embodiment of the present invention. , A liner winding roll wound through a plurality of (three in this embodiment) guide rollers 3, and 3a and 3b, an unvulcanized rubber sheet W is formed on a forming drum. 4 shows a material supply conveyor such as a belt conveyor for conveying and supplying in a tangential direction on the upper surface.

On the material supply conveyor 3b located on the side of the forming drum 4, a belt-shaped unvulcanized rubber sheet W is previously formed with a length L corresponding to the circumferential length of the forming drum 1 and a cross section of approximately V which has been stamped. A detecting means 7 such as a laser displacement meter for detecting the cut portion PP in the shape of a letter is provided. Further, the detecting means 7 is provided between the material supply conveyors 3a and 3b based on a detection signal from the detecting means 7. , Unvulcanized rubber sheet W behind cut section PP
Is installed.

As shown in FIGS. 3 and 4, the pre-formed unvulcanized rubber sheet W has a cut portion PP having a substantially V-shaped cross section, as shown in FIGS. Stand 10
The pressing plate 11 is moved by a hydraulic cylinder or the like in a state where the pressing plate 11 is sandwiched between the fixed base 10 and a heated pressing plate 11 having a chevron shape provided so as to be able to move forward and backward. The thickness H of the cut portion PP is a thin portion that can be cut by the tensile force when the unvulcanized rubber sheet W is pulled by the rotational driving force of the forming drum 4 as described later. For example, it is formed in a thickness of 0.1 mm to 0.3 mm.

When the thickness H of the cut part PP is set to 0.1 mm or less, the cut part P is not used during the molding process or during transportation.
-P may be cut off, and if it is 0.3 mm or more, it cannot be easily separated by pulling, and the unvulcanized rubber sheet W may be stretched or the cut surface may be deformed. May occur. The clamp device 8 for clamping the unvulcanized rubber sheet W has a concave cross section at a position vertically opposed to each other across a transport line Q-Q of the unvulcanized rubber sheet W, as shown in FIGS. Clamp bars (upper blade, lower blade) 12a, 12b and this clamp bar 1
An elastic member 14 such as a spring is provided in the recesses 2a and 12b.
a, a sheet peeling member 13 that can appear and disappear through the b
a and 13b.

The clamp bars (upper blade, lower blade) 12a,
The support member 16b is provided on a column 15 which is vertically erected.
The upper clamp bar 12a (upper blade) is mounted so as to be able to move up and down along a guide rail 17 provided on a column 15 via a support member 16a. It is configured to contact the clamp bar (lower blade) 12 b via the cylinder 18.

On both sides of the clamp bars 12a and 12b, the clamp bars 12 are provided via elastic members 14a and 14b such as springs fitted on the guide pins 19a and 19b.
It is configured to be able to buffer when a and 12b come into contact. Inside the forming drum 4, fixing means 20 for locking and fixing a starting end such as a vacuum pad for sucking and holding the starting end Wa of the supplied unvulcanized rubber sheet W on the drum surface is provided. On the upper surface of the forming drum 4, there is provided a crimping means 21 for crimping the starting end Wa of the supplied unvulcanized rubber sheet W to the drum surface. The crimping means 21 includes a crimping cylinder 22 such as an air cylinder, and a rotatable crimping roll 23 attached to the tip of a rod 22a of the crimping cylinder 22.

The material supply conveyors 3a, 3b
The endless belt 5 is wound around a driving roller 24b and a driven roller 24a, and the unvulcanized rubber sheet W is sequentially conveyed to the forming drum 4 side. Next, FIG. 2 shows a schematic front view of a device for automatically applying an unvulcanized rubber sheet W according to a second embodiment of the present invention. In this embodiment, the unvulcanized rubber sheet W is transported to the forming drum 4 side. Material supply conveyors 3a and 3b such as supply belt conveyors
Is disposed horizontally with respect to the center O of the forming drum 4, and in particular, the material supply conveyor 3 b located on the side of the forming drum 4 is connected to the forming drum 4 via a reciprocating drive device such as a cylinder (not shown).
And is configured to affix an unvulcanized rubber sheet W thereto.

The driven roller 24a of the material supply conveyor 3b located on the side of the forming drum 4 also serves as a pressing roller for pressing the unvulcanized rubber sheet W to the forming drum 4, and other components are the same as those of the first embodiment. Since it is the same as the embodiment, the same reference numerals are given and the description is omitted. Next, a method of automatically attaching the unvulcanized rubber sheet W to the forming drum 1 will be described with reference to FIG.
This will be described with reference to (a) to (e).

First, an unvulcanized rubber sheet W, in which a cut portion PP is stamped with a predetermined thickness H at a position corresponding to the circumferential length L of the forming drum 4 in advance, is wound from the raw roll 1. The liner R is taken out and supplied onto the material supply conveyors 3a and 3b, while the front end of the liner R interposed between the unvulcanized rubber sheets W is wound around the liner winding roll 2.

In this state, as shown in FIG. 9A, the material supply conveyors 3a and 3b are driven to rotate, and the material supply conveyor 3b located on the forming drum 4 side is moved via an advance / retreat driving device (not shown). The starting end Wa of the unvulcanized rubber sheet W is locked and fixed by a fixing means 20 such as a vacuum pad incorporated in the forming drum 4 while being moved toward the center side surface of the forming drum 4 and brought into contact therewith.

In this state, as shown in FIG. 9 (b), the forming drum 4 is rotated by a predetermined rotation angle, and the cutting is performed by pressing the forming drum 4 to a position corresponding to the circumferential length L of the forming drum 4 in advance. When the section PP is detected by the detecting means 7 (FIG. 9)
9C), based on the detection signal from the detection means 7, the clamp device 8 provided behind the detection means 7 is operated as shown in FIG. 9D.

The operation of the clamp device 8 is described in FIGS.
As shown in FIG. 5, the lifting cylinder 18 extends and the clamp bar 12a descends, and the lower surface of the clamp bar 12a and the upper surface of the opposing clamp bar 12b extend over the entire upstream width of the unvulcanized rubber sheet W. At the time of clamping (holding), the sheet peeling members 13a and 13b are pushed into the recesses and firmly clamped.

Then, in this state, the pressed portion P-P of the unvulcanized rubber sheet W is pressed by the rotational driving force of the molding drum 4 and the suction holding force of the fixing means 20 of the unvulcanized rubber sheet W.
Is cut while being pulled, and the unvulcanized rubber sheet W is stuck on the forming drum 4 by the rotation of the forming drum 4. When a predetermined time has elapsed after the closing operation, the clamp device 8 returns to the original position and waits until the cutting position of the next unvulcanized rubber sheet W comes.
a of the unvulcanized rubber sheet W which is in close contact with the lower surface of the uncured rubber sheet W or the upper surface of the clamp bar 12b.
When the end portions of the unvulcanized rubber sheet W pass through the driven roller 24a also serving as a pressure roller, the rotation of the forming drum 4 is stopped, and the unvulcanized rubber sheet W is released. Is completed (see FIG. 9E).

As a method for manually affixing the unvulcanized rubber sheet W to the forming drum 4, the unvulcanized rubber sheet W unwound from the raw roll 1 is supplied to the material supply conveyors 3 a and 3 b.
And the leading end Wa of the unvulcanized rubber sheet W is pulled out to the upper surface position 4a of the forming drum 4 and
It is locked and fixed by fixing means 20 such as a vacuum pad incorporated therein.

Then, when the forming drum 4 is rotated by a predetermined rotation angle, and the cutting section PP which has been previously pressed to a length position corresponding to the circumferential length L of the forming drum 4 is detected by the detecting means 7, Based on the detection signal from the detection means 7,
The unvulcanized rubber sheet W at the rear portion of the cut portion pressed by the clamping device 8 provided behind the detecting means 7 is clamped.

In this state, the pressed portion P of the unvulcanized rubber sheet W is pressed by the rotational driving force of the molding drum 4 and the suction holding force of the fixing means 20 for the unvulcanized rubber sheet W.
−P is cut while being pulled, and an unvulcanized rubber sheet W is attached on the forming drum 4. Since other operations are the same as those of the second embodiment, the same reference numerals are given and the description is omitted.

As described above, the circumferential length L of the forming drum 4 is determined in advance.
When a non-vulcanized rubber sheet W having a cut portion PP embossed to a length corresponding to the above is attached to the forming drum 4, the embossed cut portion PP is formed without using a special cutting device. By cutting with the rotational driving force of the drum 4 and the suction holding force of the fixing means 20, the unvulcanized rubber sheet W can be automatically attached, and the cycle time is shortened to significantly improve the work efficiency. It is possible to make it.

[0032]

Since the present invention is constructed as described above, when an unvulcanized rubber sheet having a cut portion stamped in advance to a length corresponding to the peripheral length of the forming drum is attached to the forming drum, The embossed cutting section is cut by the rotational driving force of the molding drum without using a special cutting device, and the cut end of the unvulcanized rubber sheet is automatically peeled off from the clamp device, and the unvulcanized The rubber sheet can be attached smoothly and automatically, and as a result, there is an effect that the cycle time can be shortened and the working efficiency can be significantly improved.

Further, since the structure of the entire apparatus is simple, it can be manufactured at a low cost, the operation of automatically attaching the unvulcanized rubber sheet can be performed efficiently, and the productivity can be improved. is there.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an unvulcanized rubber sheet manual sticking and sticking apparatus showing a first embodiment of the present invention.

FIG. 2 is a schematic front view of a device for automatically applying and sticking an unvulcanized rubber sheet according to a second embodiment of the present invention.

FIG. 3 is a side view of an embossing device for embossing an unvulcanized rubber sheet.

FIG. 4 is a partial perspective view of a stamped cut portion of an unvulcanized rubber sheet.

FIG. 5 is a front view of an unvulcanized rubber sheet clamping device.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is an enlarged side view taken on line AA of FIG. 5;

8 is an enlarged side view taken along the line BB of FIG. 5;

FIGS. 9A to 9E are process explanatory diagrams of a method of automatically attaching an unvulcanized rubber sheet to a forming drum.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Raw material roll 2 Liner winding roll 3a, 3b Material supply conveyor 4 Forming drum 5 Belt main body 7 Detecting means 8 Clamping device 9 Die-pressing device 10 Fixing table 11 Pressure plate 12a, 12b Clamp bar (upper blade, lower blade) 13a , 13b Sheet peeling member 14a, 14b Elastic member 15 Column 16a, 16b Supporting member 17 Guide rail 18 Elevating cylinder 19a, 19b Guide pin 20 Fixing means 21 Crimping means 22 Crimping cylinder 22a Rod 23 Crimping roll 24a Follower roller 24b Driving roller W Vulcanized rubber sheet Wa Beginning end of unvulcanized rubber sheet PP Cut section H Thickness QQ Conveying line for unvulcanized rubber sheet R Liner

Claims (5)

[Claims] An unvulcanized rubber sheet unwound from a material roll and supplied onto a material supply conveyor is pulled out to the upper surface of a forming drum and locked there, and the forming drum is rotated by a predetermined rotation angle. Then, when the detecting unit detects a cut portion which has been previously pressed at a length position corresponding to the circumferential length of the forming drum, based on a detection signal from the detecting unit, the clamping unit provided behind the detecting unit detects the cut portion. The unvulcanized rubber sheet in the rear part of the pressed cut part is clamped, and in this state, the cut part of the unvulcanized rubber sheet is pressed by the rotational driving force of the forming drum and the fixing means of the unvulcanized rubber sheet. A method for sticking an unvulcanized rubber sheet, comprising cutting an unvulcanized rubber sheet onto a forming drum while pulling the sheet. 2. The method according to claim 1, wherein the starting portion of the unvulcanized rubber sheet unwound from the material roll and supplied onto the material supply conveyor is moved to the center side surface of the forming drum by the material supply conveyor and pressed and locked. By rotating the drum by a predetermined rotation angle and detecting the cut portion which has been previously stamped at a length position corresponding to the circumference of the forming drum by the detecting means, based on a detection signal from the detecting means, the rear of the detecting means is detected. The unvulcanized rubber sheet at the rear part of the cut portion is clamped by the clamp device provided in the apparatus, and in this state, the unvulcanized rubber is rotated by the rotational driving force of the forming drum and the fixing means of the unvulcanized rubber sheet. A method for attaching an unvulcanized rubber sheet, comprising cutting the cut portion of the sheet while pulling the sheet while pulling the sheet, and attaching the unvulcanized rubber sheet on a forming drum. 3. A raw roll for unwinding a band-shaped unvulcanized rubber sheet having a cut portion embossed at a predetermined interval, and fixing means for locking and fixing a starting end of the unvulcanized rubber sheet. And a detecting means for detecting a stamped cut portion of the unvulcanized rubber sheet on the material conveying conveyor in the vicinity of the forming drum, and a detecting means behind the detecting means. And a clamping device for clamping upper and lower surfaces of the unvulcanized rubber sheet based on a detection signal from the detecting means. 4. The clamp device according to claim 1, further comprising a clamp bar having a concave cross-section, at least one of which is capable of approaching / separating from each other, which is vertically opposed to each other across the conveyance line for the unvulcanized rubber sheet. 4. The apparatus for attaching an unvulcanized rubber sheet according to claim 3, wherein a sheet peeling member that can appear and disappear in the recess is provided. 5. A material conveying conveyor in which a plurality of the material supply conveyors are arranged in series and a material conveying conveyor installed near a forming drum is provided.
The apparatus for pasting an unvulcanized rubber sheet according to claim 3 or 4, wherein the apparatus is configured to be able to advance and retreat with respect to the molding drum.