JPS63217203A - Transmission device for signal and electric power of touch sensor - Google Patents

Abstract

PURPOSE:To perform electric feeding and signal transmission in a small- malfunction state and to perform operation which is stable for a long period by transmitting the signal and electric power required for a touch sensor by an inductive coupler. CONSTITUTION:An AC voltage generated by an AC power source 7 is converted by a high frequency transmitter 8 into a high frequency voltage. Then the voltage is fed to the touch sensor 3 through the inductive coupler 6 and rectified by a rectification part 9 to obtain a DC power source. Then a phase converter 12 synchronizes with the touch signal of the sensor 3 to shift the phase of a high frequency signal by a specific quantity, and returns this signal from the secondary side 62 of the coupler 6 to a primary side 61. This phase-converted signal is separated and outputted by a phase detector 13.

Description

[Detailed Description of the Invention] [Technical Field Subject to the Invention] The present invention relates to an improvement of a touch sensor for measuring the dimensions of a workpiece in a machine tool, etc., and a device for transmitting signals and power to the touch sensor. It is related to.

[Prior art and problems]

In recent years, computer control of machine tools has progressed, and FMS
It is widely used in factories and factory automation. These automated machine tools not only perform positioning and jig replacement, but also automatically measure the workpiece at the same time as processing. That is, as shown in FIG. 3, in a machine tool 1 such as a lathe, a measurement probe 3 is attached to a tool rest 2 of the machine tool 1, and the finishing accuracy of a workpiece 4 is checked. The processing surface 4 is used as a measurement probe 3.
A touch sensor is used that emits a signal at the moment of contact with a, and the dimensions of the machined surface are measured by linking the signal from this sensor with the positioning function of the machine control system. In particular, in this touch sensor, it is necessary to quickly transmit a detected touch signal in order to improve measurement accuracy.

On the other hand, a large number of blades 25 are generally attached to a tool rest of a lathe, etc., and the tool suitable for the processing at the time is selected by rotating the tool rest.

For this reason, a non-contact method is used to transmit the touch signal from the touch sensor, and generally an optical transmission method is used as shown in FIG. At this time, the touch sensor requires an optical signal drive circuit, and a battery 22 is built into the housing 21 for driving the touch sensor, and when the contact 5 comes into contact with the workpiece, the light emitting part 23 emits light. is sensed by a light receiver 24 installed at a distance from the projector.

However, due to the nature of the optical signal transmission system, this system is susceptible to oil contamination, which is characteristic of machine tools, and this can cause malfunctions. It is also necessary to periodically replace the built-in battery 22, which is an important issue in making these machine tools completely unmanned.

[Purpose of the invention]

In view of these conventional drawbacks, the present invention aims to supply power and signal transmission to touch sensors used in machine tools, etc. that are constantly exposed to oil, with extremely few malfunctions, and to maintain stable temperature over a long period of time. The purpose is to provide a device that operates.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

That is, in Fig. 2, a lathe is shown as a machine tool,
A known cutter (not shown) is attached to the tool rest 2, which is rotatably supported by the lathe main body IK, and at the same time a touch sensor 3 is attached thereto. This touch sensor is provided with a contactor 5 that selectively contacts the workpiece 4. An inductive coupler 6 is provided between the lathe body l and the tool rest 2, and for example, the primary side of the inductive coupler 6 is connected to the lathe body l,
Further, the secondary side thereof is provided in the tool rest 2.

Further, in the circuit diagram shown in FIG. 1, the output end of a high frequency oscillator 8 driven by an AC power source 7 is connected to the primary side 61 of the inductive coupler 6. The touch sensor 3 is connected to the secondary side 62 of the inductive coupler 6 via the rectifier 9, and the oscillator 11 and the phase converter 12 that converts the phase of this oscillator are also connected to the secondary side 62 of the inductive coupler 6. be established. The output end of the touch sensor 3 is connected to the phase converter 12. Further, a phase detector 13 for detecting the phase converted by the phase converter 12 is connected to the primary side 61 of the inductive coupler 60, and an electric circuit such as a switching circuit is connected to the output terminal 13a of this phase detector.

〔motion〕

In FIG. 1, an AC voltage generated by an AC power source 7 is converted into a high frequency voltage by a high frequency oscillator 8, and is supplied to the touch sensor 3 through an inductive coupler 6.
It is further rectified by a rectifier 9 to become a DC power source. The phase converter 12 is synchronized with the touch signal from the touch sensor 3, shifts the phase of the high frequency signal by a predetermined amount, and returns this signal from the secondary side 62 of the inductive coupler 60 to the primary side 61. This phase-converted touch signal is sent to the phase detector 13.
It is separated and output by Note that the frequency of the high-frequency signal used here is sufficiently fast relative to the required response time of the touch signal, that is, it is a high frequency.

〔effect〕

As described above, this invention uses an inductive coupler to transmit the signals and power necessary for the touch sensor, so it can be made into a completely sealed structure.
It is particularly resistant to oil stains, and there is no need to use a battery like in the past, so there is no need to replace it, making it virtually maintenance-free, which is particularly effective when used in machine tools.

In this embodiment, the touch sensor is illustrated as a contact type signal circuit, but this is not limited to the contact type, and it is also possible to use energy such as laser light.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing one embodiment of the device according to the present invention, FIG. 2 is a front sectional view of the block, FIG. 3 is a front sectional view of a conventional device, and FIG. 4 is a front view of a touch sensor. DESCRIPTION OF SYMBOLS 1... Lathe main body, 2... Turret, 3... Touch sensor, 4... Workpiece, 5... Contact, 6... Inductive coupler, 7... AC power supply, 8... High frequency oscillator, 9... Rectifier, 11... Oscillator, 12...
... Phase converter, 13... Phase detector. Patent applicant: Yamatake Honeywell Co., Ltd. No. 2
Figure 1

Claims (1)

[Claims] The high frequency oscillator (8) is connected to one of the inductive couplers (6).
At the same time, a touch sensor (3) is connected to the secondary side of this coupler via a rectifier (9), and an oscillator (11) is connected to the secondary side of the inductive coupler (6).
) and a phase converter (12) for converting the phase of this oscillator.
), the output end of the touch sensor (3) is connected to the phase converter (12), and the primary side of the inductive coupler (6) is connected to the phase converter (12). a touch sensor signal and power transmission device connected to a phase detector (13) for detecting the phase of the touch sensor;