JPH0355305B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a stitcher device for a tire molding machine, and more specifically, it is capable of sufficiently compressing the tire shoulder portion, and is also suitable for wide flat tires. This invention relates to a stitcher device for a tire molding machine that can be easily adapted.

[Prior Art] A stitcher device for second molding in a tire molding machine performs a crimp operation on a cap tread while rotating a pair of left and right crimp rollers from the center of the tread portion of a green tire along the left and right shoulder portions, respectively. This is how it was done.

However, if the pressure roller is simply rotated, as the pressure roller moves to press the shoulder portion, as it rotates, it will move along the vertical line O-O passing through the center of the green tire 6, as shown by the dashed line locus in FIG. On the other hand, since the inclination angle of the pressure roller 62a increases, when the pressure roller 62a reaches the vicinity of the shoulder portion 66, the inclination of the pressure roller 62a becomes considerably large, and the vertical component force Fv of the pressure force F becomes extremely small. There is a problem in that the shoulder portion cannot be sufficiently crimped, resulting in vulcanization failure.

In order to solve the above-mentioned problems, a device has been proposed in which a pair of left and right crimp rolls are moved laterally in the width direction at the center portion, and the crimp rolls are operated while rotating along the shoulder portion (Unexamined Japanese Patent Publication No. Publication No. 48-31274, Japanese Patent Publication No. 77483-1983, Japanese Patent Publication No. 11513-1983). However, in the case of such conventional equipment, when the left and right crimp rolls are moved laterally from a state where they are aligned with the center of the tire width, air accumulates in the tread rubber that is sandwiched between the two left and right crimp rolls. In order to prevent this, the arms that support the pair of left and right pressure rollers had to be made into a very complicated link mechanism, which resulted in an increase in the size of the mechanism. I was getting used to it.

[Purpose of the invention]

The purpose of this invention is to simplify the support mechanism for the pair of left and right pressure rollers, while also being able to reliably pressure the shoulder part without creating an air pocket in the center of the tread part, and to easily apply pressure to wide flat tires. The present invention provides a stitcher device for a tire molding machine that can handle the following.

[Structure of the invention]

In order to achieve the above-mentioned object, the present invention provides a green tire with a
A stitcher device for crimping a pair of left and right crimping rollers, moving them laterally from a center portion toward a shoulder portion, and rotating them at the shoulder portion for crimping processing, wherein the pair of left and right crimping rollers are The attached swing arms are each bent toward the shoulder part, and the swing center shafts that support the base ends of the swing arms are respectively attached to bearing boxes, and the bearing boxes are arranged at different levels above and below. The gist of this is that they are overlapped so that the center axes of rotation are aligned vertically, and that they can be moved apart toward the shoulder portion.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Note that in the following explanation, numbers in brackets indicate the same or symmetrical constituent elements, and their explanations will be omitted.

FIG. 1 is an overall side view of a stitcher device embodying the present invention, which is installed opposite to a green tire 6 supported concentrically on a main shaft 5 of a tire molding machine. A rail 2 is laid on the base 1 so as to be perpendicular to the spindle 5, and a frame 20 is installed on this rail 2 via a slide bearing 3 so that it can move forward and backward in response to changes in the outer diameter of the green tire 6. A carriage unit 4 is provided on this frame 20. That is, one end of the screw shaft 7 is rotatably held by a bracket 8 fixed to the base 1, and the other end is fitted into a bracket 9 with a threaded bush fixed to the frame 20. Therefore, by rotating the threaded shaft 7 by a drive means (not shown), the carriage unit 4 on the frame 20 can be moved toward or away from the green tire 6 and set at an optimal position.

Next, reference numerals 10a and 10b indicate bearing boxes installed on the frame 20. Rotating center shafts 51a and 51b are supported on the bearing boxes 10a and 10b. Bent pivot arms 11a, 11b are rotatably supported. Swivel arms 11a, 11b
A pressure bonding arm 13a (13b) is swingably supported via a pin 12a (12b), and a pressure roller 14a (14b) is attached to the end of the pressure bonding arm 13a (13b).

The pressure roller 14a (14b) is the pressure bonding arm 13
A (13b) is rotatably supported at one end of the crimp arm 13a via a pin 15a (15b).
(13b) is an air cylinder 17a (17b) pivotally connected to a pair of brackets 16a (16b) fixed to the swing arm 11a (11b).
Fork end 18a attached to the rod tip of
(18b) via a pin 19a (19b).

The bearing boxes 10a and 10b are arranged in two different levels, upper and lower, and each has a pair of rails 22 on brackets 21a and 21b installed on the frame 20.
a, 22b via slide bearings 23a, 23b so as to be slidable along the longitudinal direction of the main shaft 5 of the tire molding machine.

Two bearing boxes 10a, 10 arranged at different levels
As shown in FIG. 2, when the pair of left and right pressure rollers 14a, 14b are located at the center of the tread portion, the vertical axis b completely coincides with the vertical axis, and the rotation center 24a (24b) of the rotation arms 11a, 11b (the rotation center axis 51a ( 5
1b)) also coincide in the plane. Here, the bearing box 10a that supports the left-hand swing arm 11a can be moved laterally to the left from the state shown in FIG. 2, and the bearing box 10b that supports the right-hand swing arm 11b.
can similarly be moved laterally to the right.

25 is a drive shaft for lateral movement of the bearing boxes 10a, 10b, and screws 26a, 2 are in opposite directions.
6b, one end is supported by a bearing 27, and the other end is rotatably supported by a bearing box 29 incorporated in a bracket 28. Movement drive shaft 25
A chain wheel 30 is fixed to the shaft end of the
It is connected to a motor 34 with a reduction gear via a chain 31, a chain wheel 32, and a torque limiter 33.

As shown in FIG. 4, the bearing box 10a is screwed into the screw 26a of the moving drive shaft 25 via a bracket 35 with a threaded bushing, and the bearing box 10a
Similarly, the screws 26b are screwed into the screws 26b via brackets 36 with threaded bushes. Therefore, when the motor 34 with a speed reducer rotates, the bearing boxes 10a and 10b move toward or away from each other by the same amount in opposite directions via the left and right screws 26a and 26b of the moving drive shaft 25.

Bracket 3 attached to the bearing box 10a
7, an actuator 38 is fixed as shown in FIG.
A limit switch 40 is provided on the other side to set the opening amount of the pressure rollers 14a, 14b.

Next, drive shafts 41a and 41b for swinging the swinging arms 11a and 11b are disposed vertically and parallel to each other on the frame 20, and one end thereof is a bearing incorporated in a bracket 42 erected on the frame 20. It is fitted into the boxes 43a, 43b, and the other end is fitted into the bearing boxes 10a, 10b, respectively. The shaft ends of the shafts 41a and 41b are provided with the marks shown in FIGS.
As shown in the figure, chain wheels 44a, 44b
is fixed to the output shaft of the motor 45 with a reducer,
A chain wheel 47 attached via a torque limiter 46 and the chain wheel 44
A chain 48 is spanned between a and 44b.

Next, to explain the drive mechanism shown in FIGS. 3 and 4, rotating shafts 51a, 51b are supported in the bearing boxes 10a, 10b via rotating bearings 49a, 49b and 50a, 50b. . Worm wheels 52a, 52b are sandwiched between the rotation bearings 49a, 49b and 50a, 50b, and are coupled to the rotation shafts 51a, 51b by keys 53a, 53b, respectively. Rotating bearing 49
a, 49b and 50a, 50b are lids 54a, 5
4b, 55a, 55b, 56a, 56b, etc., to prevent the rotating shafts 51a, 51b from moving in the axial direction.

A rotating arm 11a,
11b is fitted and fixed in the rotational direction by keys 57a, 57b, and plates 58a, 58b
It is also fixed in the axial direction. Further, inside the bearing boxes 10a and 10b, a pair of rotating bearings 49a,
Worm gears 60a and 60b whose twist directions are opposite to each other are sandwiched through 49b and mesh with the worm wheels 52a and 52b. The rotary bearings 49a, 49b are held down by lids 61a, 61b to prevent movement of the worm gears 60a, 60b in the axial direction.

The insides of the worm gears 60a, 60b are hollow, and the swing drive shafts 41a, 41b are fitted therein. Long key grooves 62a, 62b are cut into the swing drive shafts 41a, 41b, and the wavy gears 60a, 6 are operated by sliding keys (not shown).
It is connected to 0b.

Therefore, when the bearing boxes 10a, 10b are moved laterally by the rotation of the moving drive shaft 25, the worm gears 60a, 60b slide on the swing drive shafts 41a, 41b. In addition, the rotation of the rotation drive shafts 41a and 41b allows the worm gear 60
worm wheel 52a meshing with a, 60b;
Since the rotation shafts 51a and 51b rotate in opposite directions via the rotation shaft 52b, the pressure rollers 14a and 14b move away from each other or approach each other.

The trajectories of the swing arms 11a, 11b when they are separated are shown in FIG. 3 by two-dot chain lines.

Next, FIG. 5 shows the locus of the pressure roller on only one side of the stitcher device in the second forming process,
Pressure roller 62b (shown in solid line) according to the invention
and the conventional pressure roller 62a (shown in broken line).
are compared with. 63a and 63b are the rotation centers of the rollers 62a and 62b, respectively. L is the radius of rotation, and T is the amount of lateral movement of the pressure roller along the main axis of the molding machine. Further, 64 is the outline of the first step green case when it has a toroidal shape, and 65 is the cap lead.

As shown by the solid line, the pressure roller 62b of the present invention
In the center part of the tread part, there is a pressure roller 62.
When it moves sideways while crimping part b, and then moves to the shoulder part, it rotates to reduce the inclination angle, so that it can improve the crimping of the tread part.

In such a crimping operation, crimping at the center portion is started with the left and right crimping rollers 14a, 14b in close contact with each other, so that no air pockets are generated in the tread portion. In addition, since the function of preventing air accumulation is performed by the bearing boxes 10a and 10b arranged vertically at different levels and the swing arms 11a and 11b curved toward the shoulder section, the device becomes complicated and large. can be achieved without.

As described above, the stitcher device according to the present invention can easily perform lateral movement and turning with a simple configuration, so it can reliably stitch not only general tires but also flat and wide tires. It is something that can be done.

〔Effect of the invention〕

In the present invention, a pair of left and right pressure rollers are pressed onto the surface of the tread portion of a green tire supported on the main shaft as described above, and are moved laterally from the center portion toward the shoulder portion, and at the same time, the pressure rollers are moved laterally from the center portion toward the shoulder portion. The stitcher device performs crimping by rotating and moving, and the rotating arms to which the pair of left and right crimping rollers are attached are each bent toward the shoulder portion, and the pivoting center shafts supporting the base ends thereof are respectively bent. It is attached to a bearing box, and the bearing boxes are arranged at different levels above and below, and at the center of the tread section, they are overlapped so that the center axis of rotation is aligned vertically, so that they can be moved apart toward the shoulder section.
It has the following excellent effects.

(a) Since the pair of left and right pressure rollers are aligned with the center of the tire width, they are moved laterally to perform the pressure bond.
Pressure bonding can be performed without generating air pockets, etc., and it is possible to reliably stitch not only general tires but also flat and wide tires.

(b) The above drive mechanism is constructed by combining a pair of left and right swing arms curved toward the shoulder and bearing boxes arranged at different levels above and below, so the mechanism can be made simple and compact without complicating it. .

[Brief explanation of drawings]

FIG. 1 is an overall side view of a stitcher device for a tire molding machine embodying the present invention, and FIG.
Fig. 3 is a plan view including a partial cross section of the lower bearing box, Fig. 4 is a front view including a partial cross section of the upper and lower bearing boxes, and Fig. 5 is a stitcher device in the second molding process. The trajectory of the pressure roller on only one side of
FIG. 3 is an explanatory diagram comparing the operation of the pressure roller according to the present invention (indicated by a solid line) and a conventional pressure roller (indicated by a broken line). 4... Carriage unit, 5... Spindle core, 6... Green tire, 10a, 10b... Bearing box, 11
a, 11b...swivel arm, 13a, 13b...pressure arm, 14a, 14b...pressure roller, 51a,
51b...Turning center axis.

Claims (1)

[Claims] 1 A pair of left and right pressure rollers 14a, 14 are attached to the surface of the tread portion of the green tire 6 supported on the main shaft core 5.
The stitching device is a stitcher device that performs crimping process by crimping the parts b and moving it laterally from each center part toward the shoulder part, and rotating it at the shoulder part, and the pair of left and right crimping rollers 14a and 14b are attached. The swing arms 11a and 11b are each bent toward the shoulder portion, and the swing center shafts 51a and 51b that support the base end thereof are respectively bent to the bearing box 10.
a, 10b, and the bearing boxes 10a, 10b are arranged at different levels above and below, and at the center of the tread section, they overlap so that the pivot axes 51a, 51b are vertically aligned, and can be moved apart toward the shoulder section. Stitcher device for tire molding machine.