SU760138A1 - Device for coordinate displacement - Google Patents

Description

The invention relates to the field of instrumentation and can be used in low-power precision actuators of executive devices of software control systems with relatively small moves.

There are known devices for the coordinate movement U, containing two mutually perpendicular carriages connected to separate coordinate stepper drives, and a table is located on the first carriage in guides parallel to the guides of the second carriage, which is connected to the second carriage through the shank assembly. The device is an actuator of an open-loop control system in which the accuracy of the angle between the coordinates is ensured by the accuracy of the angle between the carriages.

This process is time-consuming and labor-intensive and is practically reduced a little, even with mass production of devices.

The device is known coordinate

displacement which is the most

close to the proposed device

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In its technical essence and the achieved result, it contains a control unit connected to the coordinate drives of two mutually perpendicular carriages, on the first of which, guides, parallel to the guides of the second carriage, a table is installed, which is connected to the second carriage and accordingly for each coordinate photoelectric position sensors connected to the control unit and made in the form of moving and indicator scales, photodetectors and illuminators. Such a device is a device with a closed control loop, in which the accuracy of the angle. Between the coordinates is ensured by the accuracy of the angle between the corresponding coordinate sensors [2].

However, as in the first case, the problem of reducing labor intensity and increasing accuracy is not solved, since it is necessary to adjust the angle between the sensors.

The aim of the invention is to increase the accuracy and manufacturability of the Device.

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This goal is achieved by the fact that in a known device of coordinate movement having a control unit connected to the coordinate drives of two mutually perpendicular carriages, on the first of which, in guides parallel to the guides of the second carriage, a table is installed, which is connected to the second carriage and accordingly for Each coordinate photoelectric sensors P / L connected to the control unit and made in the form of movable "* indicator gauges, photodetectors

and illuminators, while the moving scales of both coordinates are made in the form of two mutually perpendicular raster structures deposited on a common basis fixed on the table, and the raster structure for the first coordinate has rasters optically connected with the corresponding indicator scale attached to the first carriage, and The raster structure of the other coordinate has rasters that are optically connected with the corresponding indicator scale attached to the base. ....... ····· - - In FIG. ί given the device; in fig. 2 - coordinate table with

photoelectric sensors mounted on the carriage (other parts and blocks are not shown).

\ ~ In the guides ί, the first carriage 2 is installed, which is connected through engine 3 to control unit 4. On the carriage 2 in the guides 5, perpendicular to the guides 1, a table b is installed, which is connected to the second carriage 8 installed in the guides 9 through the shank assembly 7, which is connected to the control unit 4 through the engine 10. On the coordinate table there is a movable scale of 11 coordinate sensors, which is optically connected with the indicator of _______ scales of coordinates xi y. The movable scale is made in the form of two mutually perpendicular raster structures ’tour. The width of the raster structure of the coordinate system is equal to the length of the raster structure of the x coordinate. The indicator scale 12 is rigidly attached to the carriage 2, and the indicator scale 13 coordinates y are rigidly attached to the base 14. The lighter 15 (Fig. 2) x coordinates are placed opposite the scale 13 and block of photodetectors 16. Elements 14 and 16,

...... As the frame 13, attached to the base ... 14. The elements 17 and 18, as well as the scale 12, are attached to the carriage 2. The photodetectors 16 and 17 are connected to the "control unit 4. ...... ... ... ......

The device works as follows. '

When the carriage 2 moves in any direction, along the x or y coordinates, the illumination of the photodetectors 17 and 16 changes cyclically, and therefore

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A periodic signal is issued to the control unit for which a signal is generated, which serves to control the movement of the carriages. The implementation of the moving scale 11oboi coordinates on the same substrate and its establishment on the coordinate table 6 allows you to directly measure the movement of the table without intermediate links, excluding errors introduced by them. Normally known devices, the x and y coordinate sensors have a separate moving scale, made on different bases for each coordinate. Such an embodiment of the device Requires precise installation and adjustment of the perpendicularity of the angle between the carriages and sensors, and when they are installed on different elements of the device, the adjustment process is complicated, time-consuming and requires certain skills of the assembler. The modern development of microchip fabrication technology allows using a photochemical method to spray and etch perpendicular raster structures in a metal film with high accuracy. The same technology allows for an unlimited number of multiplication of raster structures on the fabricated templates. Therefore; precision fabrication of the angle between the raster structures on one template solves the problem of setting the angle for the entire series of devices.

Thus, the implementation of the proposed device movable scales in the form of raster structures deposited on a common basis, mounted on the coordinate table, and optically connected with the indicator scales, allows to increase the accuracy and manufacturability of the device.

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Claims (1)

Claim A coordinate device containing a control unit connected to the coordinate drives of two mutually perpendicular carriages on the first of which, in guides parallel to the guides of the second carriage, a table is installed, kinematically connected with the second carriage, photoelectric position sensors connected to the control unit, made in the form movable and indicator scales, photo-detectors and illuminators, which is related to the fact that, in order to increase the accuracy and manufacturability of the device, mobile scales filled in the form of two mutually perpendicular raster structures deposited on a common basis fixed on the table, the raster structure for the first coordinate having rasters associated with the corresponding indicator scale attached to the first carriage, and 760138 The raster structure of the second coordinate has rasters optically connected to the corresponding indicator scale attached to the base.