JPS5943797B2 - coordinate determination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for optically detecting and determining coordinates of an original drawing.

That is, the features of the present invention include a roll around which a coordinate determination drawing is wound, a rotation drive device that rotates the roll in the X-axis direction, and a detection device that optically detects the density of the drawing wound around the roll. , a drive device that causes relative movement between the detection device and the roll in the Y-axis direction perpendicular to the rotational direction; a discrimination device that discriminates the gray signal of the detection device; and detection points X and Y in the drawing by the detection device. and a device that outputs a coordinate signal based on the discrimination output.

The present invention will be explained below with reference to an embodiment of the drawings. 1 is a roll, 2 is a drawing for determining the coordinates wound around the roll, 3 is a rotating shaft that rotates the roll 1, 4 is a bearing that supports the shaft 3, and 5 is one step. A rotary drive device 6 is a detection device for optically detecting the image shown in FIG. 2, and is composed of a light emitting diode 6a, condensing lenses 6b and 6c, and a photocell 6d for photoelectric detection, and is screwed onto a screw shaft T. , optical detection is performed while moving in the Y-axis direction by a relative movement device 8 that performs pulse relative movement by a constant one-step movement amount. Reference numeral 9 denotes a circuit for discriminating the detection signal of the photocell 6d, which discriminates the detection signal, for example, at a certain level or above and below, or further at a plurality of levels, and outputs the signal.

Reference numeral 10 denotes a device that outputs control signals to the X-axis motor 5 and Y-axis motor 8, and also outputs coordinate determination signals from drawing detection points X and Y corresponding to the signals and the discrimination output of the discrimination circuit 9.

Normally, pulse motors are used for the motors 5 and 8, and device control is performed in accordance with the number of pulses.

The motor 5 is rotated by the X-axis output pulse of the device 10 to rotate the roller 1 and move the drawing 2 in the X-axis direction, and the motor 8 is actuated by the Y-axis output pulse of the device 10 to move the screw shaft T. By rotating the detecting device 6, the detecting device 6 is moved in the Y-axis direction, and the copying control shown in 2 in the drawing is performed. The detection device 6 focuses light on one point on the ground in the drawing 2 and receives reflected light corresponding to the shading of the drawing. By the scanning control, the light spot on the drawing is detected from end to end of the X-Y plane, and the detection signal has a different amount of reflected light depending on the shading, so by distinguishing this, the shading of the drawing can be determined. easily detected. The convenient circuit 9 for discriminating the detection signal is constituted by, for example, a Schmitt or the like, and can accurately detect shades of light and light by discriminating between above and below a certain set level, and further by making stepwise discrimination based on a plurality of levels. The output of the discrimination circuit 9 is applied to a device 10, and the output of the rotary motors 5, 8 whose output is controlled by the device 10 is determined by the detection device 6 at a photodetection point X in FIG.
, Y are determined, and by inputting the shading at this point from the discrimination circuit 9, coordinate signals of the X and Y points on the drawing and the shading at those points are output from the device 10. The coordinate signals output from the device 10 can be recorded on, for example, a magnetic tape or an NC tape, and can be used for cutting, grinding, electrical discharge machining, etc. by NC control. As described above, the present invention optically detects a coordinate determination drawing using a density detection device, and when a detection light spot moves along the drawing,
Since the detection signal of the detection device corresponding to the light spot position is discriminated and the light spot position and the discrimination signal are combined to output a coordinate signal, the coordinates can be detected very easily and accurately. It is extremely effective when used for machining feed control in cutting, etc.

[Brief explanation of the drawing]

The drawing is a configuration diagram of an embodiment of the present invention. 1 is a roll, 2 is a drawing, 3 is a rotating shaft, 5 is a motor, 6 is an optical detection device, 7 is a screw shaft, 8 is a rotating motor, 9 is a detection signal discrimination circuit, and 10 is a control circuit.

Claims (1)

[Claims] 1 Roll around which the coordinate determination drawing is wrapped and the roll
A rotary drive device that performs a pulse rotation drive with a constant one-step movement in the axial direction, a detection device that optically detects the density of the drawing wound around the roll, and a device that is perpendicular to the rotational direction between the detection device and the roll. a relative movement device that performs pulsed relative movement with a constant one-step movement amount in the Y-axis direction; a discrimination device that discriminates the gray level signal of the detection device; and detection points X and Y on the drawing by the detection device and the discrimination output. A coordinate determination device consisting of a device that outputs coordinate signals at