DE1946395A1 - Photoelectric encoder for following a contour to be copied - Google Patents

Description

P »f..nfunw.il re

ZELLENViTi υ. LUYKEN

8-r-O Münchon 2 2

! Uokr. 6th

Vsesojuznyj Nau & io-IssledovatelskiJ September 12, 1969 Institut Kriogennogo Mas'inostrojenija ρ £ i 578 / I Moscow / USSR

FOTOELjSKTRISCHER DONORS TO TRACK A to COPY END CONTOUR

The present invention relates Potokopiereinrichtungen, inabesondere photoelectric encoder for tracking a contour to be copied which are for photocopier control means of industrial equipment, for example, NEN Brennechneidmaschi provided.

Photoelectric transmitters for following a contour to be copied are known, which are provided for photocopier control devices of industrial plants, for example still-burning machines. With these fotoelectrlsohen encoders, a main and an additional current, each one

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Statement about the position of the contour to be copied and about whose upcoming change contain, scanned by two eccentrically arranged modulation elements of a rotary modulator and arrive at individual photoelectric registrars, which stream the light into electrical control signals of the actuating mechanisms of photocopying facilities (see e.g. a USSR copyright certificate No. 199 227, KX. 21c, 46/50).

The described eccentric arrangement of the modulation elements in the mentioned donors leaves only the forthcoming one Assess the change in the position of the contour to be copied and does not contain any information about its change in a coordinate system. In addition, the photoelectric recorder must be different in these photoelectric encoders Constructions for each of the L loht currents exhibit, because the main stream as well as the additional light current reach the photoelectric «! Hegiatler directly.

The purpose of the present invention is to eliminate of the above mentioned parts.

The present invention is based on the object of such a photoelectrically ^! Encoder for tracking the lo & tur to be copied, which is provided for photocopier control devices of industrial plants, for example Brenneohneidmaaohinen, _{to create ISt 9} , which enables a statement about the change of the position of the contour to be copied in coordinates and can be used for photocopying with different dynamic behavior.

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This object is achieved by means of a photoelectric encoder for tracking a contour to be copied, which is provided for photocopier control units of industrial plants, for example flame cutting machines, and in which a main and additional luminous flux, which provides information about the position of the contour to be copied and about whose upcoming change contain, are scanned by two eccentrically arranged modulation elements of a rotary modulator and on individual photoelectrically ^. Get registrars who convert the Liehtstrom in electrical control signals of the actuating mechanisms of the photocopier. In the case of the photoelectric encoder described, the axes of the modulation elements of the modulator lie according to the invention in an axis that goes through the axis of rotation of the modulator

on

Plane on one side of this axis.

For the use of individual photoelectric recorders of the same design in a photoelectric encoder it is advisable to go behind the modulator in the direction of the Liohtströme a means of redistributing the main and additional luminous flux to the individual photoelectric recorders to arrange.

The means of redistributing the main and additional luminous flux to the individual photoelectric recorders is preferably in the form of a mirror with a central opening which is at an angle to the axes of the module

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lat ionsei elements of which * is mounted that through this opening only the main luminous flux passes through.

When the modulation elements of the modulator are designed in the form of positive lenses, this can be the main and additional at breeding currents on the individual photoelectric recorders redistributing means can be made in the form of two diaphragms, each at an angle to the axes of the modulation elements is mounted and one through the respective photoelectric recorder does not stop the flow of light from being read.

Thanks to such a structural design of the present photoelectric encoder, there is the possibility of the Copy speed depending on the curvature value of the contour to be copied to ensure optimum performance while maintaining a high degree of degradation of the product automatically to variable

The invention is intended below on the basis of the description a specific embodiment and the accompanying drawings are explained in more detail; it shows;

Fig. 1 the "rfirtefurigsgtme / Sen photoelectric encoder (im Axial section);

FIG. 2 shows a section along the line H-II of FIG. I;

3 shows the second variant embodiment of the present one photoelectric encoder (overall sketch)}

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Pig. 4- the position of the main and additional luminous flux obtained when a straight line is copied by the photoelectric transducer according to the invention, as well as the signals of the photoelectric recorder corresponding to this position;

flg. 5 the same when changing the coordinates of the position of the to copying contour in the direction to the right;

fig. 6 the same when the coordinates of the position of the contour to be copied change in the direction to the left;

This photoelectric encoder for tracking the contour to be copied is provided for photocopier control means van Brennscheidinaschinen. This photoelectric

a

See encoder contains lens 2, lighting devices 3 and condensers 4, which are accommodated in housing I (fig.I), as well as a modulator 5 lying on the optical axis of lens 2, which is driven by a synchronous motor (in the drawing

not indicated) is set in rotary motion.

The modulator 5 provides one on the rotor 9 of the synchronous motor fixed disc 6 with two modulation elements in the form of openings 7 and 8.

The geometrical axes of the openings 7 and 8 lie

eccentrically in one through the axis of rotation 10 (Fig. 2) dea Mo-

ouf
dulator 5 going plane on one side of this axis. In the flg. 2, the straight track of this plane is indicated by letters αα.

The rotary modulator 5 scans through its two openings 7

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the

and δ the main luminous flux 11 (Fig. 1) or additional luminous flux 12, which each contain a statement about the position of the contour to be copied 13 of the drawing 14 and about the imminent change in the position of the contour 13 to be copied.

Behind the modulator 5 is in the direction of the luminous flux

11 and 12 on the main luminous flux 11 and the additional luminous flux

12 on the individual photo electric hackers 15 and 16 redistributing means installed «In the described variant of a photoelectric encoder, this Means a mirror 17 with a central opening 18 which is at an angle to. the axes of the openings 7 and 8 in such a way it is arranged that only the main light current 11 passes through the opening 18 to the photoelectric recorder 15. The use of the mirror 17 allows both the main luminous flux 11 and the additional luminous flux 12 to use the structurally identical photo-electric recorders 15 and 16.

In the second variant of a photoelectric Encoder occur as modulation elements of the modulator 5 positive lenses 19 and 20 (Fig. 3), their optical axes in a plane passing through the rotary shaft of the modulator 5

mf ■ ■
eccentric a somersault, this axis lie. Basing the main stream 11 and the accessory stream 12 on the individual photoelectrically "" feeder 15 ^# and 16 * umvexfceiiende means stillti two diaphragms * 21 and 22 & * r, each of which is below

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is arranged at an angle to the optical axes of lenses 19 and 20

The present photoelectric transducer according to the first variant (Pig · I) works as follows.

The luminous flux is reflected by the contour IJ to be copied and illuminated by the lighting devices 5 and passes through the lens 2 to the modulator 5 set in rotation by the motor.

The main light stream 11 containing a statement about the position of the contour 13 to be copied, as described above is scanned through the opening 7 of the modulator 5 and passes through the opening 18 of the mirror 17 to the photoelectric Registrar 15. The one statement about the upcoming Change of the position of the contour to be copied 1? containing additional luminous flux 12 is through the opening 8 of the modulator 5 is scanned and, by reflecting it back from the surface of the mirror 17, it hits the photoelectric Registrar 16. Ba the accuracy of the potentiometer en depends on the width of the copying zone, the distance from the axis of rotation 10 of the modulator 5 is up to Center of the opening 7 due to the specified copying accuracy and the distance from the axis of rotation 10 of the modulator 5 to the center of the opening 8 through the dynamic Behavior of the photocopiers is determined while the required degree of automatic speed change

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19463S5

depend depending on the curvature value to be copied contour 13 and the allowable acceleration value when copying angles from the dynamic behavior of Photocopying.

We will consider how this photoelectric encoder works when the position of the contour to be copied changes 13 in x, y coordinates (Fig. 4,5,6).

4 shows the copying of a to the y coordinate parallel straight lines of the contour to be copied IJ. The light path formed by the opening 7 hits the photoelectric recorder 15 »of the main signal 23 (the time t is plotted on the abscissa axis and the current intensity J is plotted on the ordinate axis), while the through the opening 8 formed light path on the photoelectric Registrar 16 arrives, which generates the additional signal 24. In this case there is no phase shift between signals 23 and 24, and the photocopier works at the set working speed.

FIG. 5 shows copying when the coordinates of the position of the contour 13 to be copied are changed in the direction to the right, and FIG. 6 when the coordinates of the position of the contour 13 to be copied are changed in the left direction. In these cases, the signals 23 and 24 have a phase shift by the angle if, which is used for the automatic speed change.

The mode of operation of the present photoelectric encoder according to the second variant embodiment (FIG. 3) is that

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the above-described mode of operation of the encoder according to the first variant (Fig. 1) similar.

On the contour to be copied 13 * (Fig. 3) two in With respect to the axis of rotation of the modulator 5 concentric light paths are projected by the positive lenses 19 and 20, which are formed by the modulator 5 rotating at a synchronous speed, the one between the to be copied Contour 13 'and the lighting device is arranged. The main luminous flux U reflected by this contour hits on the photographic recorder 15 *, and the reflected Additional luminous flux 12 on the photoelectric recorder 16 *.

The aperture 21 holds the main light flow 11, and the aperture 22, the additional light flow 12 on.

The distance between the optic axes of the positive Lenses 19 and 20 and the axis of rotation of the modulator 5 is through the predetermined copying accuracy and the dynamic Determines the behavior of the photocopiers.

In both embodiments of the invention, the convert Registrar I5, 16 and 15 ', 16 * the luminous fluxes into one electric alternating current, whose frequency depends on the speed of rotation of the modulator 5 is determined, while the phase of one of its flanks determines the inclination of the contour to be copied 13 and 13 'in the chosen coordinate aeyetem kenaze is worthwhile.

The use of this photo electric encoder at Brennechneidmaechinen allows the technological process to optimize for the flame cutting of metal, because a "

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gives the possibility to continuously and automatically change the speed to generate the necessary signals as a function of the curvature value of the contour to be copied, i.e. to cut the metal with a maximum speed for the given sheet thickness and the speed as a function continuously variable from the curvature value of the contour to be copied to reduce. However, the optimization conditions for the parameters of cutting require different ratios the change in speed at angles of the contour to be copied as a function of its curvature. The given photoelectric encoder makes it possible to solve this problem by making a phase comparison between the Main and the additional signal turns on and when exceeded

^ the difference signal ^ a predetermined critical Value regulates the speed of the photocopier, which controls the copying accuracy, the reliability and the service life of the distilling machines can be increased.

In addition, the present photoelectric encoder allows the additional, for example, for process control information required when firing metal to read »For this purpose one leaves additional lines in the drawing, which pass through the light path of the additional algnala can be read.

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Claims (1)

September 12, 1969 P 21 578/1 - 11 - PATENT CLAIMS: ί 1 J photoelectric encoder for tracking e / ner to be copied contour, which is provided for photocopier control means of industrial equipment, for example, cutting machines, and in the efn main and e / n auxiliary luminous flux, each containing a statement about the location to be copied contour and contain about their imminent change, are scanned by two eccentrically arranged modulation elements of a rotary module and meet individual photoelectric recorders, which convert these luminous fluxes into electrical control signals of the actuating mechanisms of the photocopying devices, characterized in that the axes of the modulation elements of the modulator (5) * -in one on one side plane passing through the axis of rotation (10) of the modulator (5) lie on this axis. 2. Photoelectric encoder according to claim 1, characterized in that behind the modulator (5) in Direction of the luminous flux on the main luminous flux (11) and the additional luminous flux (12) on the individual photoelectric Registrar (15 and 16) redistributing means is arranged. 3 ».- Photoelectric encoder according to claim 2, daduroh characterized in that the main light stream (11) and the additional light stream (12) on the individual photoelectric Register (15 and 16) redistributing means is a mirror (17) with a central opening (18), which under one 109814/0962 19463S5 Angle to the axes of the modulation elements is arranged such that only the main luminous flux (11) t through this opening comes through 4. Photoelectric encoder according to claim 2, characterized in that when the modulation elements are executed the modulator (5) in the form of positive lenses (19 and 20) the main light stream (11) and the additional light current (12) to the individual photoelectric recorder (15 'and 16 *) redistributing means two diaphragms (21 and 22), each of which is angled to the axes of the modulation elements and one through the respective one Photoelectric recorder (15 'or 16') stops the luminous flux (11 or 12) that cannot be read. 1098 U / 0 96 2 BATH