JP2001310397A - Method and apparatus for sticking tread rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct the dispersion in length of tread rubber pieces uniformly. SOLUTION: Before the tread rubber pieces G are stuck to a molding drum D, the lengths of them are measured. The difference T (=Ls-Lt) between the circumferential length Ls of the sticking on the drum D and the measured length Lt of the tread rubber piece is detected for each piece. The press quantity of a tool 5 for pressing/sticking the pieces G to the drum D is set to increase the quantity when the difference T is large and to decrease the quantity when the difference T is small.

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 attaching tread rubber to form an annular tread ring by attaching tread rubber around a forming drum.

[0002]

2. Description of the Related Art In a tire manufacturing process, as shown in FIG. 8A, an annular tread ring GR is formed by sticking a tread rubber G supplied from a servicer a to a forming drum D.

As the tread rubber G, a molded body continuously extruded from a rubber extruder or the like is formed into a molding drum D so that the front end E1 and the rear end E2 can be accurately joined.
Is cut to a length that can correspond to the circumference of.

However, this tread rubber G is usually
As shown in (B), once cut, the tray c
The storage or transfer to the next process is performed in the stacked state of the above. Therefore, the load differs depending on whether the tread rubber G is placed on the upper side or the lower side, or on the front side or the back side. As a result, the amount of rubber contraction (shrink amount), that is, the length of the tread rubber G varies. Sticking will occur.

Therefore, conventionally, as shown in FIGS. 9A and 9B, after the tread rubber G is adhered, when the front end E1 and the rear end E2 are not joined well, the rear end side is slightly wound. An operation of returning and then re-applying while stretching or compressing is performed by a worker.

[0006]

However, in this re-sticking operation, the correction of the tread rubber G with a variation in length is performed intensively in the vicinity of the joint, so that the thickness of the re-stick portion y is different. There is a problem that the uniformity is remarkably reduced, such as a large difference between the portions.

[0007] For example, in Japanese Patent Application Laid-Open No. 4-214334, after measuring the tread rubber, the moving speed of the gripping means of the rear end E2 of the tread rubber G is determined based on the measured value.
A device that controls the peripheral speed of a forming drum has been proposed. However, in this case, since the structure of the device and its control are complicated, the cost of the device is significantly increased.

Therefore, the present invention is based on the principle that the pressing amount of a pressing tool for attaching tread rubber to a forming drum is changed in accordance with the variation in length of the tread rubber, and the correction of the variation in length is performed on the tread. An object of the present invention is to provide a method and an apparatus for attaching tread rubber, which can be performed on the entire circumference of the ring and can improve uniformity while minimizing the complexity of the apparatus structure and control.

[0009]

Means for Solving the Problems To achieve the above object, a first invention of the present application is a method for attaching tread rubber, which forms an annular tread ring by attaching a long sheet of tread rubber to a forming drum. Therefore, the length of each tread rubber is set to be equal to or less than the circumferential length Ls for application on the molding drum, and the length of each tread rubber is measured before the application to the molding drum. And the measured tread rubber length Lt
The difference T (= Ls−Lt) is detected for each tread rubber, and the amount of pressing of the pressing tool for pressing the tread rubber against the forming drum and sticking the same is determined when the difference T is large. The feature is that the amount of pressing is small when the difference T is small.

The tread rubber is mounted on the servicer so as to be movable in the longitudinal direction, and the length of the tread rubber is determined by a plurality of sensors spaced apart from the other end with respect to the positioning portion at one end. Accordingly, it is preferable that the measured tread rubber length Lt is detected by being classified into classes for each length range.

[0011] The second invention of the present application is a tread rubber sticking device for forming an annular tread ring by sticking a long sheet-like tread rubber to a forming drum, wherein the length of each tread rubber is set on the forming drum. Paste circumference L
s, a servicer that conveys the tread rubber set in the length direction, a stopper that positions one end of the tread rubber in accordance with a reference position, and a stopper that positions the tread rubber by a predetermined length from the reference position. The length of each tread rubber is measured by detecting the position of the other end, and the difference T (= Ls−) between the circumferential length Ls to be attached on the forming drum and the measured tread rubber measurement length Lt is measured. L
t) a length measuring means capable of detecting t) for each tread rubber, and pressing the tread rubber supplied from the servicer onto the forming drum while pressing the tread rubber against the forming drum while increasing the length of the tread rubber. The amount of pressing by the pressing tool and the pressing tool when the difference T is large is represented by the difference T
And an adjusting means for increasing the pressing amount when the pressure is small.

It is preferable that the tread rubber length measuring means measures the tread rubber length Lt by classifying the tread rubber length Lt into classes by a plurality of sensors provided at a distance from the reference position.

Preferably, the adjusting means automatically changes the pressing amount in accordance with the difference T.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described.
This will be described together with the illustrated example. FIG. 1 is a side view conceptually showing a tread rubber sticking device 1 (hereinafter referred to as a sticking device 1) of the present application.

In FIG. 1, a sticking device 1 includes a servicer 2 for transporting a tread rubber G in a longitudinal direction, a stopper 3 for positioning one end E of the tread rubber G, and a length of the positioned tread rubber G. Is measured to detect a difference T (= Ls−Lt) between the measured circumference Lt of the tread rubber and the measured length Lt of the tread rubber on the forming drum D, for each tread rubber. Means 4 and a tread rubber G supplied from the servicer 2 and a forming drum D
And the adjusting means 6 for adjusting the amount of pressing by the pressing tool 5 according to the difference T.

As the tread rubber G, an extruded body from a rubber extruder or the like is attached to a forming drum D in consideration of the elongation due to the pressing of the pressing tool 5, and the circumferential length L
A piece cut to a length of s or less is used. Here, the “pasting circumferential length Ls on the forming drum D” is one circumferential length of a sticking surface on which the tread rubber G is stuck, and when directly sticking to the outer circumferential surface of the forming drum D, The peripheral length of the outer peripheral surface corresponds to the pasting peripheral length Ls.

As in the conventional case, the tread rubber G is cut and then stored in a stacked state in a stacked state, so that the length of the tread rubber G varies.

Next, in this embodiment, the servicer 2 includes a frame 7 having a support rod 7A extending in the length direction. The frame 7 has the tread rubber G linearly moved in the length direction. The conveyor section 9 to be placed freely is mounted horizontally. The conveyor section 9 is in the form of, for example, a transfer table on which spherical free bearings are spread, and on the transfer surface 9S, the tread rubber G is centered on the forming drum D by guiding both side edges of the tread rubber G. Guide (not shown) is projected.

The stopper 3 is in contact with one end E of the tread rubber G, in this example, the rear end E2, so that the rear end E2 is positioned in accordance with the reference position J.
Having.

In this embodiment, the stopper 3 is provided as shown in FIG.
As schematically illustrated in (C), when the tread rubber G is carried into the conveyor unit 9, the tread rubber G waits at the upper rear standby position Y1. Thereafter, the stopper 3 descending to the lower rear standby position Y2 moves forward to the reference position J,
The rear end E2 of the loaded tread rubber G is pushed forward by the contact surface 14, whereby the positioning of the rear end E2 in accordance with the reference position J is performed. In this positioning state, the length of the tread rubber G is measured. Thereafter, the tread rubber G by the stopper 3 is moved to the forward position Y3 where the front end E1 of the tread rubber G reaches the forming drum D.
Is pushed.

Accordingly, as shown in FIGS. 2 and 3 in this embodiment, the stopper 3 is attached to a movable table 11 held on a guide rail 10 provided on the frame 7 via a lifting means 12.

A screw shaft 13 pivotally attached to the frame 7 and extending in parallel with the guide rail 10 is screwed into, for example, a bulging portion 11A on the upper surface of the movable table 11. One end is connected to a motor M1 attached to the frame 7. Therefore, the moving table 11
By the operation of the motor M1, the stopper 3 can be moved back and forth from the rear standby position Y2 to the forward movement position Y3, and can be stopped at the reference position J.

In this embodiment, a cylinder is used as the elevating means 12, and the stopper 3 is moved to the rear standby position Y so as not to prevent the tread rubber G from being carried into the conveyor section 9.
1. Move up and down between Y2.

As shown in FIG. 3, the contact surface 14 of the stopper 3 has an upper contact surface portion 14A for receiving the upper surface on the rear end side of the tread rubber G and an oblique contact surface portion 14B for receiving the rear end surface. And illustrates a case where it is formed in a concave shape substantially the same as the cross-sectional shape of the rear end E2. Therefore, the contact surface 14 is composed of the upper contact surface 14A and the oblique contact surface 14B.
And the rear end E2, which is obliquely cut, can be accurately positioned by accurately sandwiching the rear end E2.

The contact surface 14 includes the upper contact surface portion 14.
A concave portion 15 is provided at the intersection of A and the oblique contact surface portion 14B to further improve the positioning accuracy and to prevent deformation of the top portion by allowing the thin skin remaining at the top of the rear end E2 to escape. .

The tread rubber measuring means 4 detects the position of the other end (the front end E1 in this example) of the tread rubber G positioned by separating the tread rubber G from the reference position J by a predetermined length. The length of the tread rubber G is measured respectively, and the difference T (= L) between the measured tread rubber measurement length Lt and the above-mentioned attached circumferential length Ls is measured.
s-Lt) is detected for each tread rubber.

In this embodiment, the tread rubber length measuring means 4
Has a plurality of sensors S provided apart from the reference position J, whereby the tread rubber measurement length Lt is
An example in which measurement is performed by classifying each length range will be described.

The sensor S is a so-called non-contact type optical sensor using a photoelectric tube, and is attached to the conveyor section 9 with a space P in the lengthwise direction with the space below the conveying surface 9S. The sensor S identifies the presence or absence of the tread rubber G at each sensor position by reflecting (or blocking) the irradiation light by the tread rubber G.

FIGS. 5A to 5C and Table 1 show that the tread rubber G is short and medium using first and second sensors S1 and S2 arranged in order from the stopper 3 toward the front. , The length is classified into three stages and the measurement is performed. Reference numerals L1 and L2 in the figure indicate the distances of the first and second sensors S1 and S2 from the reference position J, respectively.

As shown in Table 1, for example, the first and second sensors S1 and S2 are OFF; when OFF, the front end E1 is located behind the first sensor S1 (FIG. 5 (A)). Therefore, it can be measured that the tread rubber measurement length Lt is in the length range CA (short class) smaller than the length L1. The first and second sensors S1 and S2 are O
N; when OFF, it can be detected that the front end E1 is located between the sensors S1 and S2 (FIG. 5 (B)), so that the tread rubber measurement length Lt is longer than the length L1 and less than the length L2. Can be measured to be within the range CB (middle class).
When the first and second sensors S1 and S2 are ON;
It can be detected that the front end E1 is located ahead of the second sensor S1 (FIG. 5 (C)), so that the tread rubber measurement length Lt is equal to or greater than the length L2 in the length range CC (length class). Can be measured.

Also, the difference T between the tread rubber measurement length Lt and the pasting circumference Ls can be detected by classifying into three stages, large, medium and small, respectively.

[0032]

[Table 1]

Thus, the measured tread rubber length Lt is
By performing measurement by classifying each of the length ranges CA, CB, and CC, it is possible to achieve a quick measurement time, a simple and quick arithmetic processing for a measured value, and the like. Also, as the sensor S, an inexpensive sensor that can be binaryly recognized as ON / OFF can be used, so that the apparatus cost can be reduced.

The number of sensors S used is the tread rubber G
The number can be set freely to two or more, for example, three, four or more according to the range of the length variation and the required measurement accuracy. For example, if the length variation is based on the difference in the amount of rubber shrinkage (shrink amount) in the mounted state as in this example, two to three sensors S are sufficient, If there is also a variation, it is preferable to use more sensors S.
The interval P between the sensors S, S can be freely set according to the required measurement accuracy, but is preferably in the range of 4.0 to 6.0 mm, for example, about 5.0 mm.

Next, the pressing tool 5 is connected to the servicer 2.
A pressing roller 19 that is attached to the forming drum D while increasing the length of the tread rubber G by pressing the tread rubber G supplied from the Pressure means 20.

Here, in the present application, the tread rubber G having the front end E1 affixed to the forming drum D moves from the servicer 2 to the forming drum D while being pulled by the forming drum D. Therefore, by increasing the amount of pressing by the pressing roller 19, the tread rubber G can be adhered while being extended, for example, the brake on the tread rubber G is increased, and the length thereof can be substantially increased. In particular, by adjusting the pressing amount to be large when the difference T is large, and to be small when the difference T is small, the difference T can be offset by the extension of the tread rubber G, and the length variation can be reduced over the entire circumference. The correction can be made uniformly over the whole area.

In this embodiment, a cylinder 20B for attaching a rod downward to the frame 7 is used as the pressing means 20.

The pressing roller 19 is pivotally supported around an axis parallel to the drum axis via a holder 21 provided at the lower end of the rod. The roller surface has a contour shape conforming to the outer shape of the tread rubber G, and the tread rubber G
Is pressed substantially uniformly over substantially the entire width thereof.

The adjusting means 6 adjusts the amount of pressing by the pressing device 5 according to the difference T. This adjusting means 6
In this example, as schematically shown in FIG. 6A, one high-pressure air source 22 is connected to this high-pressure air source 22 at one end through a switching valve 23 and the other end is selectively connected. An operating section 25 having a plurality of operating flow paths 24 connected to the cylinder 20B, and a control section 26 for switching the switching valve 23 according to the difference T are provided. Also, in each working channel 24,
A regulator 27 intervenes to reduce the air pressure from the high-pressure air source 22 to a predetermined pressure different from each other and regulate the pressure.

In this embodiment, the working channel 24 is composed of three working channels 24A to 24C.
Regulators 27A to 27C interposed between A to 24C
An example is shown in which the air pressure from the high-pressure air source 22 is adjusted to three high, medium, and low pressures corresponding to the difference T.

The control section 26 switches the switching valve 23, and when the difference T is large, connects the air pressure from the high-pressure air source 22 to the high-pressure working flow path 24A, and the difference T is medium. When the difference T is small, it is connected to the low-pressure working channel 24C. Note that such switching, that is, adjustment of the pressing amount, can be automatically performed by adopting a remotely controllable electromagnetic valve as the switching valve 23.

As the pressing means 20, instead of the air cylinder 20B, a spring member 29 such as a coil spring can be used as shown in FIG. Note that the spring member 29 has a pressing plate 31 that receives the upper end thereof, in this example,
By moving up and down by the rotation of the screw shaft 30B by the motor 30A, the downward pressing amount can be continuously adjusted.

4 (A) to 4 (C), the tread rubber G is carried into the conveyor section 9 in a state where the stopper 3 waits upward at the rear standby position Y1. After that, the stopper 3 which has descended to the lower rear standby position Y2 moves forward to the reference position J, and pushes the tread rubber G by the contact surface 14 so that the rear end E2 is aligned with the reference position J. Done.

In this positioning state, the tread rubber length measuring means 4 detects the position of the front end E1 of the tread rubber by its sensors S1 and S2, and calculates the tread rubber measured length Lt, in this example, the short / medium length. Three length ranges CA ~
Measure by classifying into CC. The difference T (= Ls−L) between the measured tread rubber length Lt and the attached circumferential length Ls.
Similarly, t) is detected by classifying into three stages of large, medium and small.

Thereafter, the stopper 3 is moved to the tread rubber G
Pushes the tread rubber G to an advanced position Y3 where the front end E1 of the rubber reaches the forming drum D. The stopper 3 does not push the tread rubber G further beyond the advance position Y3. Accordingly, the tread rubber G whose front end is engaged with the pressing roller 19 is supplied from the servicer 2 while being pulled by the forming drum D, and
It is adhered to the forming drum D while being extended by the pressing roller 19.

At this time, the pressing amount by the pressing roller 19 is adjusted to be large when the difference T is large, and to be small when the difference T is small. As a result, the difference T can be offset by the extension of the tread rubber G, and the variation in length of the tread rubber G can be uniformly corrected over the entire circumference.

Next, FIG. 7 schematically shows another embodiment of the attaching apparatus 1 of the present invention. In this example, the stopper 3 is fixed to the conveyor section 9 at the reference position J by a bolt or the like. Note that the fixing position of the stopper 3 is set for each size in order to cope with the tire size change. And
The rear end E2 of the tread rubber G carried into the conveyor unit 9 is pressed against the stopper 3 by the hand of an operator, and the length is measured in this positioning state. Thereafter, the worker moves the tread rubber by the operator's hand until the front end E1 of the tread rubber G is held between the drum D and the pressing roller 19 and automatically started to be drawn into the drum D.

Further, the stopper 3 is disposed on the front end side, and the front end E1 is positioned by the stopper 3, and the rear end E
2 may be configured to be detected by the sensor S.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the illustrated embodiment, but may be implemented in various forms.

[0050]

As described above, according to the present invention, the amount of pressing of the pressing tool is changed in accordance with the variation in length of the tread rubber, so that the variation in length is corrected over the entire circumference of the tread ring. And uniformity can be improved while minimizing the complexity of the device structure and control.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing one embodiment of a tread rubber sticking device of the present invention.

FIG. 2 is an enlarged side view showing a stopper.

FIG. 3 is a front view showing a holding state of a stopper.

FIGS. 4A to 4C are diagrams illustrating the operation of a stopper.

FIGS. 5A to 5C are diagrams illustrating length measurement by tread rubber length measurement means.

FIG. 6A is a diagram showing an embodiment of an adjusting unit;
(B) is a schematic sectional view showing another embodiment of the pressing means.

FIG. 7 is a schematic side view showing another example of the attaching device.

FIGS. 8A and 8B are schematic diagrams illustrating a conventional attaching method.

FIGS. 9A and 9B are cross-sectional views illustrating a conventional problem.

[Explanation of symbols]

 CA to CC Length range D Molding drum G Tread rubber J Reference position S, S1, S2 Sensor 2 Servicer 3 Stopper 5 Pressing tool 4 Tread rubber measuring means 6 Adjusting means

Claims (5)

[Claims] 1. A method for sticking tread rubber in which a long sheet-like tread rubber is stuck to a forming drum to form an annular tread ring, wherein the length of each tread rubber is set to be equal to the length of the tread rubber on the forming drum. The length of each tread rubber is set to be equal to or less than the length Ls, and the length of each tread rubber is individually measured prior to sticking to the forming drum, and the circumferential length Ls of sticking on the forming drum and the measured tread rubber measured length Lt And the difference T (= Ls−Lt) is detected for each tread rubber, and the pressing amount of the pressing tool for pressing the tread rubber against the forming drum and applying the same is determined when the difference T is large. A method for attaching tread rubber, wherein the pressing amount is reduced when the difference T is small. 2. The tread rubber is mounted on a servicer so as to be movable in a length direction, and the length of the tread rubber is determined by a plurality of tread rubbers provided on the other end side with reference to a positioning portion at one end. The tread rubber sticking method according to claim 1, wherein the tread rubber measurement length Lt is detected by being classified into classes according to length ranges by a sensor. 3. A tread rubber sticking device for sticking a long sheet-like tread rubber to a forming drum to form an annular tread ring, wherein the length of each tread rubber is set to be equal to the length of the tread rubber on the forming drum. A servicer for transporting the tread rubber set to a length equal to or less than the length Ls in the length direction, a stopper for positioning one end of the tread rubber in accordance with a reference position, and the tread positioned by being separated from the reference position by a predetermined length. The length of each tread rubber is measured by detecting the position of the other end of the rubber, and the length Ts of each tread rubber is measured. Ls-Lt) can be detected for each tread rubber, and a tread rubber length measuring means, and the tread rubber supplied from the servicer is pressed against a forming drum. The pressing force applied to the forming drum while increasing the length of the tread rubber, and the pressing amount by the pressing force when the difference T is large is made larger than the pressing amount when the difference T is small. A tread rubber sticking device comprising an adjusting means. 4. The tread rubber length measuring means measures the tread rubber length Lt by classifying the tread rubber length Lt into classes for each length range by a plurality of sensors provided apart from the reference position. The tread rubber attaching device according to claim 3, wherein the tread rubber is attached. 5. An apparatus according to claim 3, wherein said adjusting means automatically changes a pressing amount in accordance with said difference T.