JPS6122968Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a glass cutter equipped with a tip wear detector for cutting glass. In order to detect the degree of wear on a glass cutting tool for cutting or scribing glass, conventional methods have been to visually check the cutting tip, check by hearing the cutting sound, and inspect the scribed or cut surface. However, it is a sensory test and has the drawback of large individual differences, so the development of a quantitative detection method has been desired. In particular, automated scribing or cutting equipment has the drawback that even if the cutting tool is worn out, many defective products are produced by continuing to use it as is, and constant supervision by a skilled worker is required. .

The present invention eliminates these drawbacks and aims to provide a glass cutter that monitors the level of the glass scribing or cutting sound in real time and issues an alarm signal when an abnormality is detected.

That is, the present invention includes a glass cutting sound detector that detects glass cutting sound attached to a glass cutting jig, and a cutting sound bandpass filter that selectively selects a desired frequency band from the output of the glass cutting sound detector. The glass cutter is characterized in that it has an alarm signal generation circuit that issues an alarm signal when the output from the cutting sound bandpass filter matches a preset setting value.

Next, the present invention will be explained in detail using figures. 1st
The figure is a configuration diagram showing an embodiment of the present invention.

In the figure, the cutting tip 1 is pressed against the glass 3 to be scribed or cut with a predetermined force by a spring 2, and the cutting tip 1 is moved along a guide 4 to linearly cut the glass. The sound of scribing or cutting the glass 3 by the cutting tip 1 during scribing or cutting is transmitted through the pressure rod 5 and transmitted to the glass cutting sound detector 6 fixed on the pressure rod 5, where it is converted into an electrical signal. is converted to Normally, an acceleration pitch pickup that covers a high frequency band input is suitable as the glass cutting sound detector 6, and this detector can detect high frequency signals ranging from several Hz to several hundred kHz. The detected broadband electric signal is input to a cutting sound bandpass filter 7 that selectively passes the frequency band caused by the sound of glass scribing or cutting, and the noise component and the glass cutting sound are distinguished from each other. Since most mechanical noises are low frequency components, a bandpass filter set in the range of tens of kHz to hundreds of kHz, which is unique to glass cutting sounds, is particularly effective in separating glass cutting sounds. The output of the cutting sound band-pass filter 7 is input to an alarm signal generating circuit 8 which generates an alarm signal, and when it matches a set value that has already been set, an alarm is issued and an abnormality in the cutting tip sound is notified. The relationship between the wear of the cutting tip 1 and the change in cutting sound is expressed as an increase in cutting energy due to tip wear or a decrease in cutting energy due to tip slippage. The degree of chip wear can be detected by checking.

According to the present invention, it is possible to detect cutting chip wear during glass scribing or cutting in real time, and the conventional sensory tests are no longer necessary. Furthermore, if a method is used to control the load on the cutting tip so that the cutting sound bandpass filter output is constant during scribing and cutting, stable scribing and cutting can be performed at all times, and at the same time, the wear of the cutting tip can be compensated for. It also becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is a cutting tip, 2 is a spring, 3 is a glass, 4 is a guide, 5 is a pressure rod, 6 is a glass cutting sound detector, 7 is a cutting sound bandpass filter, and 8 is an alarm signal generating circuit.

Claims (1)

[Scope of utility model registration request] a glass cutting sound detector for detecting glass cutting sound attached to a glass cutting jig; a cutting sound band pass filter that selectively selects a required frequency band from the output of the glass cutting sound detector; and a cutting sound band. A glass cutter characterized by comprising an alarm signal generation circuit that issues an alarm signal when the output from the pass filter matches a preset setting value.