JP3146314B2 - Tire building drum circumference setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for setting the circumference of a tire forming drum, and more particularly, to reducing the setup change time when changing the tire size in a variable circumference tire type second stage forming drum. In addition, the present invention relates to a tire forming drum circumference setting device that prevents erroneous setting.

[0002]

2. Description of the Related Art Conventionally, a tire forming drum 1 having a variable circumference can be used.
For example, as disclosed in FIG. 3 and Japanese Patent Laid-Open No. 60-104323, a rotatable drum shaft 2 is provided with a central shaft 3 slidable in the axial direction via a drive cylinder (not shown). A plurality of expandable and contractable drum segments 5 are connected to the center shaft 3 via a slider 4 (or a link mechanism),
The drum segment 5 is configured to be expanded and contracted by moving the center shaft 3 forward and backward by a driving cylinder. Therefore, the circumference of the tire building drum 1 is
It is set by the stroke of the drive cylinder.

[0003]

When the tire size is changed, the cassette of the drive cylinder (not shown) installed behind the drum shaft 2 is changed when the tire size is changed. The replacement adjusts the stroke of the drive cylinder, thereby changing the circumference of the tire building drum 1.

However, since the replacement of the cassette requires a lot of trouble and time for the replacement and management of the cassette, the replacement of the cassette requires a lot of trouble and time because the set bolt is loosened after the tire building drum device is stopped. There is a problem in that it is necessary to prepare, and there is a possibility that a setting error may occur because the operator performs the replacement work. The present invention has been devised in view of such a conventional problem. In a second-stage forming drum of a variable circumference type tire, when a tire size is changed, it is possible to reduce a step size without much labor and time. It is an object of the present invention to provide a tire forming drum circumference setting device capable of shortening a replacement time and effectively preventing erroneous setting.

[0005]

According to the present invention, in order to achieve the above object, a stopper rod projecting to the outside of the drive cylinder is implanted in a piston of the drive cylinder, and is provided at a position facing the tip of the stopper rod. A positioning stopper movable in the same direction as the operation direction of the drive cylinder is provided, and the positioning stopper is configured to be movable by a drive motor via a gear mechanism, and a moving amount of the positioning stopper is connected to the drive motor. The gist of the present invention is that the moving amount can be set while being detected by the rotating position detecting device.

[0006]

The present invention is constructed as described above, and the amount of movement of the positioning stopper is controlled by the drive motor, and the position of the positioning stopper is detected by the rotation position detecting device, so that the circumference of the tire forming drum is controlled. Since the length is set, the setup change operation can be accurately performed without changing the tire size without much trouble and time.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a front view of a tire building drum circumference setting device embodying the present invention, and FIG. 2 is a side view of FIG. 1. This tire building drum circumference setting device has a brake on a base frame 10. A drive motor 11 is provided, and an output shaft 12 of the drive motor 11 is provided.
Is provided with a rotational position detecting device 17 such as an ABSOCODER via a coupling 13, a timing pulley 14, a timing belt 15, and a timing pulley 16.

A pulley 20 provided on an output shaft 19 of a speed reducer 18 connected via the coupling 13 and a transmission shaft 22 installed on a frame 21 erected on the base frame 10 are shown. A gear 26 is fitted to the center of a transmission shaft 20 rotatably supported by bearings 25a and 25b and connected to a pulley 23 having a built-in clutch.

On the other hand, a drive cylinder 27 connected to the center shaft 3 inserted inside the drum shaft 2 of the tire building drum 1 is installed on a side portion of the tire building drum 1, and a piston rod 28 of the drive cylinder 27 is connected to the drive cylinder 27. It is connected to the center shaft 3. The expansion / contraction operation of the drive cylinder 27 causes the center shaft 3 to move horizontally, thereby causing the plurality of expandable / reducible drum segments 5 to operate via the slider 4 (or link mechanism).

A shaft 30 provided with a screw 29 on its outer peripheral surface is integrally attached to a side portion of the drive cylinder 27. The screw 29 meshes with the gear 26 and a screw 29
A gear 31 is provided that can move back and forth along.
A positioning stopper 33 replaceable by a bolt 32 is attached to a side surface of the gear 31, and the positioning stopper 33 is attached to the piston 28 of the drive cylinder 27.
And a stopper rod 34 projecting out of the drive cylinder 27 faces the drive cylinder 27.

Accordingly, the operating stroke of the drive cylinder 27 is regulated by the positioning stopper 33 mounted on the side surface of the gear 31 with which the stopper rod 34 contacts, and the positioning stopper 33 mounted integrally with the gear 31 is driven by the drive motor. 11 is set. Next, the operation of the tire building drum circumference setting device will be described. As shown in FIG.
When the piston 28 is located at the retreat limit, the drum segment 5 is in the maximum expanded state. When the diameter of the drum segment 5 is changed due to a change in tire size or the like, the positioning stopper The position of 33 is set by the drive motor 11. That is, when the drive motor 11 is rotated forward or backward, the transmission shaft 22 mainly rotates via the output shaft 12, the coupling 13, the speed reducer 18, and the like, and meshes with the gear 26 provided on the transmission shaft 22. Gear 3
The positioning stopper 33 attached integrally with the
It moves along the screw 29. At the same time, the position of the positioning stopper 33 is always detected and displayed by the rotation position detecting device 17 and set at a predetermined position by a push button switch or the like. Thereby, the driving cylinder 2
The position at which the stopper rod 34 abuts the positioning stopper 33 when the piston 28 of FIG. 7 is retracted has a drum diameter corresponding to the tire size.

Therefore, the position of the positioning stopper 33 is set in advance in accordance with the rotation speed of the drive motor 11, and the drum diameter is set in accordance with this. As described above, in this embodiment, the amount of movement of the positioning stopper 33 is controlled by the drive motor 11 and the position of the positioning stopper 33 is detected by the rotation position detecting device 17. Therefore, when changing the tire size, the setup change operation can be performed accurately without much trouble and time.

[0013]

According to the present invention, a stopper rod protruding outside the drive cylinder is implanted in the piston of the drive cylinder as described above, and the operating direction of the drive cylinder is set at a position facing the tip of the stopper rod. And a positioning stopper movable in the same direction as the positioning stopper, the positioning stopper is configured to be movable by a driving motor via a gear mechanism, and the moving amount of the positioning stopper is
Since the rotational position is detected by the rotational position detecting device provided on the drive motor and the amount of movement is settable, the circumferential length of the variable-length tire second-stage forming drum is changed according to the change in tire size. In this case, the operation can be easily performed without the need for a lot of trouble and time, such as replacing the cassette as in the past, and the setup time can be reduced, and erroneous setting by the operator can be prevented. This has the effect that the drum circumference can always be set accurately.

[0014]

[Brief description of the drawings]

FIG. 1 is a front view of a tire building drum circumference setting device embodying the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a cross-sectional view of a variable-perimeter tire second-stage forming drum.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tire forming drum 2 Drum shaft 3 Center shaft 4 Slider 5 Drum segment 11 Drive motor 17 Rotational position detecting device 27 Drive cylinder 28 Piston 33 Positioning stopper 34 Stopper rod

Claims (1)

(57) [Claims] 1. A rotatable drum shaft is provided with a center shaft slidable in an axial direction via a drive cylinder, and a plurality of expandable and contractable drum segments are connected to the center shaft via a slider or a link mechanism. In a tire building drum configured to expand and contract a drum segment by moving a center shaft forward and backward by a drive cylinder, a stopper rod protruding outside the drive cylinder is implanted in a piston of the drive cylinder, and the stopper is A positioning stopper that is movable in the same direction as the operation direction of the drive cylinder is provided at a position facing the tip of the rod, and the positioning stopper is configured to be movable by a drive motor via a gear mechanism. The amount is detected by a rotation position detection device connected to the drive motor. A tire forming drum circumferential length setting device, wherein the moving amount can be set.