DE2834612A1 - Low inertia copying sensor for machine tools - uses ultrasonic pulse transmitter and receiver generating control signals based on pulse travel time - Google Patents

Abstract

The copying sensor (2) houses an ultrasonic pulse transmitter (21) directed towards the template. The sensor has a receiver (22) for ultrasonic pulses. The travelling time of the pulse between the pulse transmitter and the receiver is used as proportional time difference for control signals. The copying sensor can be guided only in the longitudinal direction relative to the template configuration.

Description

Copy sensor

The invention relates to a copy sensor for machine tool controls for scanning a given contour and for generating corresponding control signals.

Copy sensors, especially those based on inductive power, have been around for a long time known and have proven themselves quite well (see e.g. Siemens-Zeitschrift No. 1969, Booklet 6, pages 505-508, especially Fig. 1-3).

However, the known sensors require one in terms of construction certain effort and do not work completely indolently.

The object of the present invention is accordingly to provide a to create relatively simple and almost inertia-free working copy sensor.

This object is achieved according to the invention in that in the copy sensor at least one directed towards the contour Ultrasonic pulse transmitter and receiver are provided and that the transit time of the pulse between pulse transmitters and receiver proportional time difference serves as a control signal. This almost Inertia-free copy sensors can be used like a conventional copy sensor can be used, but it is also possible to use it only in one direction to move to the contour and the changing measured distances as corresponding To use control signals for the drive motors of the tool or workpiece.

The invention will be explained in more detail on the basis of an exemplary embodiment; The figures show: FIG. 1 the schematic structure of a copy scanner control, FIG 2 a modification of this control in which the copy sensor only works in one direction is movable, Figure 3a, b pulse diagrams and Figure 4 a circuit for digitization of the measured value.

As can be seen from Figure 1, the contour 1 is determined by a sensor 2 scanned in the xy direction. The output signal processed in the controller 5 of the sensor 2 controls the motors 3, 4 in such a way that the sensor 2 with constant Distance 8 is moved in the x direction relative to contour 1. According to the movement of the sensor 2 is also the relative movement between the workpiece, not shown and tool controlled. The sensor 2 has at least one perpendicular to the contour 1 directed ultrasonic pulse transmitter 21 and an ultrasonic receiver 22. the Transit time T of the pulses P reflected on the contour 1 between the transmitter 21 and the receiver 22, which is proportional to twice the distance is. serves as a measure for the distance s - see Fig. 3a - and is used as the control signal of the sensor 2 of the controller 5 supplied. As a result of the relatively small distance between probe 2 and the contour 1 can be operated with a relatively high pulse repetition frequency, so that Je Time unit a large number of measured values arise. This means that every change in the contour can be recorded immediately and without inertia.

The arrangement shown in Figure 2 largely agrees with the arrangement according to Figure 1, only with the lower plate that the sensor is only in the x-direction is movable relative to the contour 1.

The respectively measured running time T, proportional to the distance el, s2 - Fig. 3b - is fed as a signal to the controller 5 and is used for the corresponding Control of a motor, not shown, for the corresponding tool or workpiece movement.

FIG. 4 shows a possible circuit for digitizing the measured value T. When the pulse P is transmitted by the transmitter 21, a flip-flop 51 is set so that that via a downstream gate 53 the pulses of a high-frequency crystal oscillator 52 get into a counter 54. When the reflected pulse P is received in the receiver 22 after the running time T, the flip-flop 51 is reset and thus the gate 53 blocked. The reading of the counter 54 is then proportional to the measured distance For a new measurement, the counter is then reset to zero in each case.

2 claims 4 figures

Claims (2)

Patent claim 1.) Copy sensor for machine tool controls for probing a given contour and for generating corresponding control signals, d a d u r c h g e -k e n n n z e i c h n e t that in the copy box (2) at least an ultrasonic pulse transmitter (21) and receiver (22) directed towards the contour (1) are provided and that the transit time (T) of the pulse (P) between the pulse transmitter (21) and receiver (22) proportional time difference is used as a control signal. 2. Use of the copier filter according to claim 1, d a d u r c h g e k e n n n n n e i n e t that only guided in the longitudinal direction (x) relative to the contour will.