JPH051762Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a touch sensor that detects two-dimensional displacement in the X and Y axes.

Prior art Touch sensors operate a switch such as a micro switch based on the displacement of a feeler and detect the point of contact based on its output signal.
No. 20643 is known. In this type, the feeler is supported by a pivot so that displacement in the + and - directions in the X-axis or Y-axis direction can be detected, and a sphere is interposed between the conical surface at the inner end and the conical surface at the end surface of the transmission shaft. The displacement in this direction is converted into one displacement in the axial direction of the transmission shaft, and this displacement is detected by a sensing switch.

Problems that the invention aims to solve: Many of these mechanisms are inevitably complicated, and it is difficult to avoid delays in the response of contact signals, and the contact pressure tends to be large, causing problems in accuracy. It was hot.

Means for Solving the Problem Magnetic poles are formed at the outer and inner circumferential edges of the stylus, which is pivotally supported in the center by a fulcrum, at the opposite end of the measurement contact end via a non-magnetic material. a ring-shaped permanent magnet, a magnetic sensor is provided opposite the permanent magnet on the center line of the ring when the stylus is in a neutral state, and a means for processing the output of the magnetic sensor is provided; The output of the processing means is set to zero, and the contact of the stylus is sensed based on the change in the output.

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

Embodiment The stylus 21 is rotatably supported in the X-axis direction by a pivot 22 fixed to a ring-shaped frame 23 in a cylinder of the main body (not shown).
The pivot 24 can be rotated in the Y-axis direction perpendicular to the
It is pivoted on a cylinder. Therefore, the stylus 21 can be rotated in the X-axis, Y-axis directions, and the combined direction thereof. The protruding end of the stylus 21 from the cylinder is formed into a sphere 25 that serves as a measuring contact end, and the inner end is attached to a ring-shaped permanent magnet 26 whose inner and outer circumferential lines serve as magnetic poles through a non-magnetic material. . Then, if necessary, a bushing made of non-magnetic material is fitted inside the cylinder corresponding to the magnet. Furthermore, the stylus
The cylinder itself may be made of non-magnetic material. In order to normally hold the stylus in a neutral state, there are four radially balanced springs 27 between the cylinder and the cylinder at four equiangular positions.
This has been mediated. When the stylus 21 is in a neutral state, one magnetic sensor 28 is attached to the cylinder facing the center line of the hole of the ring-shaped permanent magnet 26 at an interval of several mm. The output is sent to the control device of this machine.

Function When the magnetic sensor 28 is activated, it is located at the center of the magnetic field of the permanent magnet 26 as shown in FIG. When it comes into contact with the part to be measured of an object, the center of the magnetic field of the permanent magnet 26 shifts due to the displacement of the stylus 21, and the magnetic flux acting on the magnetic sensor 28 becomes stronger on the side opposite to the direction in which the permanent magnet 26 is displaced, and the balance of the magnetic flux is disrupted. Then, the output corresponding to the displacement from the magnetic sensor 28 is input to the control amplifier 30, amplified, and sent to the control device of the machine, so that the stylus 21 can be directed toward the workpiece from either the X-axis or Y-axis direction. Even if there is contact, the balance of the magnetic flux of the magnetic sensor 28 is disrupted, so a signal corresponding to the displacement is output, and two-dimensional displacement can be reliably detected with one magnet and one magnetic sensor.

Effects The present invention has a simple structure by combining a circular magnet and a magnetic sensor, and can easily detect two-dimensional displacement with high accuracy without contact.
Furthermore, since the repeatability is high, it has high reliability.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of this embodiment, and FIG. 2 is a state diagram of the magnetic field. 21... Stylus, 22, 24... Pivot, 27... Balance spring, 26... Permanent magnet,
28...Magnetic sensor.

Claims (1)

[Scope of utility model registration request] A ring-shaped permanent magnet having magnetic poles formed on the outer circumferential edge and the inner circumferential edge is attached via a non-magnetic material to the opposite end of the measurement contact end of the stylus, which is pivotally supported at the center so as to be swingable by a fulcrum, A magnetic sensor is provided opposite the permanent magnet on the center line of the ring when the stylus is in a neutral state, and a processing means for the output of the magnetic sensor is provided, and the output of the processing means is zero when the stylus is in a neutral state. This touch sensor is characterized by detecting stylus contact based on this change in output.