JPH0251383B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tire discrimination device in a trimming machine, and more specifically, to a tire discrimination device in a trimming machine that discriminates between regular tires and letter tires and performs accurate trimming. This invention relates to a tire discriminating device.

[Prior art]

Conventionally, with trimming machines that automatically cut the trim of tires, if you trim a letter tire in the same way as a regular tire, there is a risk of grinding the letter part, so before trimming the regular tire and the letter A discrimination device is used to distinguish between tires and tires.

By the way, the conventional discrimination device used for the discrimination described above presses an acceleration sensor against the letter part carved on the tire, and distinguishes between a letter tire and a regular tire based on the acceleration generated at that time while rotating the tire. Was.

However, since the acceleration sensor is configured to detect by pressing a rotatable roller against the letter part of the tire, it is difficult to perform accurate detection due to the vibration of the trimming machine, the size of the letter, the spacing between letters, etc. There was a problem that it was not possible to perform accurate trimming.

[Purpose of the invention]

This invention was devised by paying attention to such conventional problems, and its purpose is to reduce the vibration of the trimming machine, the size of letters, and the size of letters by using a displacement sensor instead of an acceleration sensor. To provide a tire discrimination device for a trimming machine that can accurately discriminate between a letter tire and a regular tire without being affected by spacing or the like.

[Structure of the invention]

In order to achieve the above object, the present invention provides a position detection roller that can be raised and lowered and rotated via a lifting means on a detection part of a rotationally driven tire, and a displacement sensor that is in sliding contact with the detection part, The gist of the present invention is that the output from this displacement sensor controls the drive device of the trimming machine via a comparison circuit with an integrator.

[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 tire discrimination device in a trimming machine embodying the present invention.
A discrimination-type tire W filled with air is supported by a rim 2 that is rotationally driven by a main shaft 1.

On the side surface of the tire W and on the detection section 3 (letter section) carved on the side surface, there is a lifting means 4 such as a cylinder.
A position detection roller 5 that can be raised and lowered through the
and a displacement sensor 6 that slides into contact with the detection section 3.
(load cell) is arranged, and the position detection roller 5
and the displacement type sensor 6 are integrally provided via a frame 7, and a rod 4a of the elevating means 4 is connected to the frame 7. The position detection roller 5 always maintains a constant position between the tire W and the displacement sensor 6, and the displacement sensor 6
It is formed in a sled shape and is configured to slide along the detection section 3.

This displacement type sensor 6 has a load cell amplifier 8
is connected to a comparator circuit 9 with an integrator as shown in FIG. 1 and FIG.
Distinguish between regular tires and letter tires by
The output signal is used to control a drive device of a trimming machine (not shown) via a relay circuit 10 (output circuit).

Next, a method for distinguishing between a regular tire and a letter tire will be explained with reference to a block diagram showing the comparator circuit 9 with an integrator (analog circuit) shown in FIG.

6 is a load cell, and 8 is a load cell amplifier. An AC coupling 11 performs comparison settings based on the input from the load cell amplifier 8, and eliminates fluctuations in tire position. And AC coupling 11
The output signal is amplified by an amplifier 12, and then integrated by an integrator 13 during the measurement command 14. This data and the set value are further compared by a comparator 15, and if the value is above a certain value, , it is determined that the tire is a letter tire, and if the value is below a certain value,
It is determined to be a general tire.

The determined value is then output to a relay circuit 10 (output circuit), and the relay circuit 10 controls a drive device of a trimming machine (not shown).

3a and 4b and 4a and 4b are comparisons of the output waveforms of a conventional acceleration sensor and the output waveforms of a displacement sensor according to the present invention through a comparator circuit 9 with an integrator. Figures 3a and 3b show the case of a general tire, and Figures 4a and 4b show the case of a letter tire.

As you can see from this waveform, in the case of regular tires, the SN ratio is 3 to 5 times higher (ratio due to the effects of trimming machine vibration, letter size, letter spacing, etc.)
In the case of letter tires, ~10 times
It can be seen that the SN ratio can be obtained.

In this way, by using a displacement sensor, a quantitative signal-to-noise ratio can be obtained, and as a result, it is possible to reliably distinguish between regular tires and letter tires before trimming using a trimming machine.

〔Effect of the invention〕

The present invention provides a position detection roller that can be raised and lowered via an elevating means and can rotate freely, and a displacement type sensor that is in sliding contact with the detection part, on the detection part of the tire that is rotationally driven as described above. Since the output from the shape sensor controls the trimming machine's drive device via a comparison circuit with an integrator, the use of a displacement sensor instead of an acceleration sensor reduces the vibration of the trimming machine.
It is possible to accurately distinguish between letter tires and regular tires without being affected by letter size, letter spacing, etc., and it is also not affected by the position of the tire.
Furthermore, since it is a displacement sensor, it has the effect of improving repeatability.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a tire discrimination device in a trimming machine embodying the present invention, Fig. 2 is a block diagram of an integrator comparison circuit, and Figs. 3a, b and 4a, b are conventional FIGS. 3A and 4B are waveform explanatory diagrams in which the output waveform of an acceleration sensor and the output waveform of a displacement sensor according to the present invention are compared through a comparator circuit with an integrator; Case b shows the case of letter tires. 3...detection section, 4...lifting means, 5...position detection roller, 6...displacement type sensor, 9...comparison circuit with integrator, W...tire.

Claims (1)

[Claims] 1. A position detection roller that can be raised and lowered and rotated freely via an elevating means is provided on the detection part of the rotationally driven tire, and a displacement sensor that slides into contact with the detection part, and the output from the displacement sensor is used to 1. A tire discrimination device for a trimming machine, characterized in that a drive device of the trimming machine is controlled via a comparison circuit with an integrator.