JPH0763926B2 - Non-contact digitizer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a digitizer that digitizes a model shape and creates an NC program.

2. Description of the Related Art Conventional non-contact digitizers do not have a stylus that comes into contact with the surface of the model. Therefore, as shown in FIG. 4, it is not possible to hold the stylus 101 by hand and perform pencil scanning to specify the surface position of the model 102.

Problems to be Solved by the Invention Pencil skinning described in the prior art is intended for rough cutting in advance of the intersecting line portion in advance in order to reduce the cutting load and the cutting time when processing a mold etc. This is an effective scanning method. Therefore, there is a problem that the performance of the digitizer cannot be utilized without this function.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to enable pencil scanning with a non-contact digitizer.

Means for Solving the Problems In order to achieve the above object, the non-contact type digitizer of the present invention is configured so that the X-axis, Y-axis, and Z-axis are relatively opposed to a model placed on a table. In a non-contact type digitizer of three-axis simultaneous control by NC having a tracer head movable in a direction and a detection mechanism for accurately detecting the position of the tracer head on each axis, a tracer head is provided to the tracer head up to a measurement point. A tracking sensor having a distance sensor that detects a distance in the Z-axis direction and a two-dimensional sensor that detects the position of the measurement point in the X-axis direction and the Y-axis direction, and a hand-held type having a light-emitting body that guides the tracking sensor at its tip. The pencil, a hand switch having three changeover switches provided on the pencil for mode selection, scanning start, and scanning end, and the output signal of the tracking sensor are always constant. Yo X
It is equipped with a digitizing control device that drives and controls the axes, Y-axis, and Z-axis and creates NC shape data from the position data of each axis, and brings the light emitter of the pencil to a position below the receivable position of the tracking sensor. The mode is switched to the pencil scanning mode, and the pencil is moved to the model while guiding the tracking sensor that keeps a fixed position above the light emitter and the scanning start switch is turned on to perform the pencil scanning.

Action Take the pencil 12 under the tracer head 9, and press the mode selection button of the hand switch SW to switch to the pencil scanning mode, and the light emitter is turned on. Then move the pencil to find a position where the tracking sensor can receive. When the tracking sensor receives the light, the receiving lamp lights up, and when the pencil is moved, the X-axis, Y-axis, and Z-axis of the digitizer follow the light emitter and the tracer head follows. Then, when the scanning start button of the hand switch SW is pressed at the data reading start point of the model 2, pencil scanning is started, each coordinate value is calculated by the scanning data in the digitizer control device 11, and tolerance processing is performed to allow it. The error is processed and NC data is created and stored. In this way, the luminous body is moved to the pencil scanning end position and the scanning end button of the hand switch is pressed to complete the pencil scanning.

Examples Examples will be described with reference to the drawings. Fig. 1 and 2
In the figure, a model table 3 for mounting a model 2 is movably mounted on a slide guide surface in the X-axis direction, which is cut on a bed 1 in a well-known digitizer, and is moved by an NC.
The axis is controlled. A rectangular column 4 is erected on the surface side of the bed 1, and a spindle head 6 is movably mounted on a slide guide surface of a cross beam 5 mounted on the column 4 in the Y-axis direction, and the Y-axis is controlled by NC. To be done. A quill 7 for a tracer head is provided on the spindle head 6 so as to be movable in the Z-axis direction, and is controlled by an NC. The tracer head 9 bonded to the tip of the quill 7 for the tressa head has a tracking sensor 10 that is a combination of a sensor that detects the distance in the Z-axis direction and a two-dimensional sensor that detects the position in the X-axis and Y-time directions. Installed. As a sensor for detecting the position in the Z-axis direction, for example, an H3065 type optical distance sensor manufactured by Hamamatsu Photonics KK can be used, which is a pulsed light beam of an infrared LED through a projection lens. The reflected light is focused on the position detection element by the light receiving lens and calculated in the controller based on the output position signal of the detection element corresponding to the distance information to the target object and the analog voltage corresponding to the distance is calculated. It is what is output. A two-dimensional sensor that detects the positions in the X-axis and Y-axis directions is, for example, G1 manufactured by Applied Measurement Laboratory Co., Ltd.
A 20-type sensor can be used. This is a position sensor that uses a MOS type solid-state image sensor as a sensor, and the camera unit, image processing unit, communication unit, and power supply unit are all housed in a small and lightweight housing. The position of the captured moving light or the like is output in real time.

A digitizing controller 11 is provided for controlling the X-axis, Y-axis, and Z-axis so that the output signal of the tracking sensor 10 is always constant and creating NC shape data from the scanning data of each axis which changes every moment. ing.

On the other hand, a spherical light-emitting body 13 that emits infrared rays is attached to the tip of a hand-held pencil 12, and the pencil 12 is provided with a hand switch SW having three push buttons for mode selection, start of skining, and end of skining. .

Next, the scanning procedure will be described with reference to the flowchart of FIG. In step S1, hand-hold the pencil 12 under the tracking sensor 10, and press the mode selection button of the hand switch SW in step S2 to switch the inside of the digitizing control device to the pencil scanning mode, and at the same time, the luminous body 13 Lights up. In step S3, if it is confirmed that the tracking sensor 10 is receiving, if no, in step S4, the pencil 12 is moved to find a position where the tracking sensor 10 can receive. When the sensor receives, step S5
At, the lamp lights up to notify the reception. Next, in step S6, the pencil 12 is moved to the model side, and in step S7, the three axes (X, Y,
Z) operates so that the sensor follows the light emitter 13 at the tip of the pencil. In step S8, bring the light emitter to the pencil scanning start position on the model and press the hand switch SW.
When the scanning start button is pressed in step S9, pencil scanning is started to calculate the X-axis, Y-axis, and Z-axis coordinate values, and in step S10, tolerance processing is performed and allowable error processing is performed. In S11, N
C data is created, the data is stored in step S12, and it is determined in step S13 whether the scanning end button is pressed or not.
If yes, then pencil scanning ends.

Effects Since the present invention is configured as described above, it has the following effects.

A spherical light emitter is provided at the tip of a hand-held pencil, a sensor for tracking the movement of this light emitter is provided on the tracer head, and a hand switch is provided on the pencil to select the pencil scanning mode, and to switch between scanning start and end. Since it is done at hand, pencil scanning with a non-contact digitizer, which was previously impossible, can be performed with a more convenient operation and the performance of the digitizer is improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the configuration of the present invention, FIG. 2 is an explanatory view showing the pencil scanning operation, FIG. 3 is a flowchart for explaining the scanning operation, and FIG. 4 is an explanatory view of the prior art. 9 …… Tracer head 10 …… Tracking sensor 11 …… Digitizing controller 12 …… Pencil, 13 …… Light emitter

Claims (1)

[Claims] 1. A tracer head that is movable relative to a model placed on a table in each of the X-axis, Y-axis, and Z-axis directions, and the position of the tracer head on each axis is accurate. In a non-contact type digitizer for simultaneous three-axis control by NC having a detection mechanism for detecting, a distance sensor provided in the tracer head for detecting a distance in the Z-axis direction to a measurement point and an X-axis direction of the measurement point. A tracking sensor having a two-dimensional sensor for detecting the position in the Y-axis direction, a hand-held pencil having a luminous body for guiding the tracking sensor at its tip, and a mode selection, a scanning start, and a scanning end provided on the pencil. NC shape data is created from the position data of each axis by driving and controlling the X-axis, Y-axis, and Z-axis so that the output signal of the hand-held switch having two changeover switches and the tracking sensor is always constant A digitizing control device is installed to bring the light emitter of the pencil to a lower position where the tracking sensor can receive, and the mode selection switch is switched to the pencil scanning mode to guide the tracking sensor that keeps a fixed position above the light emitter. A non-contact digitizer characterized by moving the pencil to the model and turning on the scanning start switch to perform pencil scanning.