JPH0443227B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a set position stop control method in a uniformity machine, and more specifically, to a method for controlling a stop at a set position in a uniformity machine, and more specifically, to stop at the point of maximum variation of force in the radial direction of a tire to be measured. The present invention relates to a set position stop control method for controlling.

[Prior art]

Conventionally, the method of measuring the uniformity of a tire under test using a uniformity machine is to control the pole change motor installed in the uniformity machine, for example, to rotate the main shaft from a high speed rotation to a low speed of about 1/3. drop it into
The tire to be measured is stopped at the maximum stopping point of radial force variation (R・F・V) (fluctuation of force in the radial direction of the tire to be measured), first harmonics (one period component of the tire to be measured), and When the stop position needs to be corrected, a worker makes the correction each time, and a marking device marks the point of maximum variation.

Another method has been to use a DC motor to control the speed of the main shaft and stop it at the maximum point of the tire to be measured.

However, in this conventional control method, the rotational speed of the main shaft is reduced to perform so-called low-speed control, so it takes time to measure uniformity for each tire, and there are problems in that it is only possible to correct a fixed value. Ta.

Furthermore, in the case of a method using a DC motor, there are problems in that the motor itself is expensive and the equipment is large-scale.Also, in the case of a DC motor, although it is possible to correct the stop position, it is difficult to provide feedback. There was a problem in that the cycle was extended and it was not possible to efficiently control the stop at the maximum point.

[Purpose of the invention]

This invention was devised by focusing on the conventional problems, and its purpose is to avoid reducing the rotational speed of the tire being measured, and to automatically correct the stop position when it is necessary to correct it. The present invention provides a set position stop control method in a uniformity machine that can be controlled to increase the cycle of tire uniformity measurement and can be performed at low cost using an existing drive motor.

[Structure of the invention]

In order to achieve the above object, the present invention detects one periodic component in the radial direction of the tire to be measured by bringing a detection means connected to a control device into pressure contact with the outer peripheral surface of the tire to be measured which is being rotated and clamped to the main shaft. At the same time, this measured value is calculated and compared with the tire stop position set in advance in the control device to obtain the maximum point stop position, and if there is a correction of the tire stop position, the control device performs calculation correction and performs calculations such as this. The gist of this invention is to output the tire maximum stop position command obtained in the following manner to the brake device of the drive motor that rotationally drives the main shaft to stop the uniformity machine at a set position.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 shows a schematic configuration diagram of a uniformity machine embodying the present invention. Inside a frame 1 of this uniformity machine, a clamping device 2 for rotatably supporting a tire W to be measured is provided. A main shaft 3 is installed vertically. The main shaft 3 is the transmission means 4
It is rotated at a constant high speed by a drive motor 6 equipped with a brake device 5 (a dynamic brake such as a mechanical brake or an electric brake).

Further, on the side of the clamp device 2 provided on the main shaft 3, a detection means 7 supported by a part of the frame 1 via a cylinder 10 is disposed, and this detection means 7 is connected to the load drum 8 and the X axis. , and a load cell 9 in the Y-axis direction.

As shown in FIG. 1, the detection means 7 is connected to a control device 13 (microcomputer) via an amplifier 11 and an AD converter 12 (analog-to-digital converter), and is rotationally driven by the drive motor 6. At the tip of the main shaft 3, a pulse generator 15 and an origin pulser 18, which are connected to the control device 13 in the vicinity of the gear 14, are provided. Further, 16 is a conveyor, and 17 is a marking device.

Next, a method for controlling the stop of the tire W to be measured at a set position will be described with reference to FIGS. 1 and 2.

First, the tire W to be measured is clamped to the clamping device 2 attached to the main shaft 3 of the uniform machine, and the detection means 7 is brought into pressure contact with the outer peripheral surface of the tire W to be measured via the cylinder 10.

Starting the drive motor 6 from this state,
When the tire W to be measured is rotated at a constant rotational speed via the main shaft 3, fluctuations in the tire W to be measured are detected via the detection means 7, and this detected value is controlled via the amplifier 11→AD converter 12. Device 13
Output and measure at fixed time intervals, R・F・
V, the maximum stopping position of the first harmonics component is compared and calculated with the data output from the origin pulser 18 to the control device 13.

Next, the operation of the control device 13 will be explained with reference to the block diagram in FIG. At C, the calculation is corrected using the correction value b stored in the previous slip correction value storage device B, and the stop position c
(c=a-b) is output to the stop position output device D. Then, the tire position detection device F is at the stop position c.
When this happens, a spindle stop command is output to the brake device 5 of the drive motor 6.

In addition, after the measured tire W has stopped, the difference Δf = f - c (current slip amount) between the output f of the tire position detection device F and the output c of the stop position correction calculation device C is stored in the correction value storage device B. The next slip correction value e = 1/2 (f - c + b) = 1/2 (Δf + b) is calculated from the current slip correction value b by the next slip correction value calculation device E, and is stored in the correction value storage device B. Each stop correction is performed using feed forward.

As mentioned above, the R・
Maximum point stop control of the F/V and first harmonics components is performed at high speed using an electric or mechanical brake device 5, and the pulse generator 15 and the origin pulser 1
8 ascertains the tire position of the tire W to be measured, the control device 13 calculates the previous stopping error, and performs automatic stopping position control using feed forward control.

Note that the control device 13 calculates the stopping error, and if the tire W to be measured is out of specification, outputs an abnormality (for example, a warning) at the maximum stop position.

〔Effect of the invention〕

The present invention measures one periodic component in the radial direction of the tire to be measured by bringing a detection means connected to a control device into pressure contact with the outer peripheral surface of the tire to be measured, which is clamped to the main shaft and rotationally driven as described above. At the same time, this measured value is calculated and compared with the tire stop position set in advance in the control device to obtain the maximum stop position, and if the tire stop position needs to be corrected, the control device performs calculation correction, and in this way, The determined tire maximum stop position command is output to the brake device of the drive motor that rotationally drives the main shaft to stop the uniformity machine at the set position, resulting in the following excellent effects. It is.

(1) Since the main shaft can be stopped from rotating at high speed, it is possible to cut the cycle and efficiently measure the uniformity of the tire to be measured.

(2) Since the control device can automatically correct the stop position, there is no need to make corrections after stopping as in the conventional case.

(3) The control device calculates the stop error, and in the event of a failure to meet specifications, it can instantly output a stop error.

(4) Since existing circuits and commercially available drive motors can be used, it can be used over a wide range of areas, and therefore tires can be measured at low cost.

(5) Furthermore, since the configuration is simple, maintenance is also easy.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a uniformity machine embodying the present invention, and FIG. 2 is a block diagram illustrating a method for controlling the stop of a tire to be measured. 3... Main shaft, 5... Brake device, 6... Drive motor, 7... Detection device, 13... Control device, W
...Tire to be measured.

Claims (1)

[Claims] 1. A detection means connected to a control device is brought into pressure contact with the outer peripheral surface of the tire to be measured which is being rotated and clamped to the main shaft, and one period component in the radial direction of the tire to be measured is measured. The maximum point stopping position is determined by comparing and calculating the tire stopping position set in the control device, and if the tire stopping position needs to be corrected, the calculation is corrected by the control device, and the maximum point stopping position of the tire determined in this way is calculated. A method for controlling a set position stop in a uniformity machine, comprising outputting a position command to a brake device of a drive motor that rotationally drives the main shaft to stop the uniformity machine at a set position.