SU756206A1 - Device for marking dial - Google Patents

Description

The invention relates to dividing devices and can be 'used in the manufacture of line measures of scales and grids.

There are known devices for applying marks on a scale that contain fixed 5 on a movable table, following the principle of Abbe's workpiece and an exemplary scale [1].

The closest to the invention by the technical essence is a device for applying labels on a scale ¹⁰ comprising a sub-Vision stage with fixed on it in compliance with the Abbe principle exemplary dashed measure and the workpiece, playback channel, control unit, power supply unit connected in series, and the print unit [ 2].

However, the accuracy of such a device is not high enough.

The purpose of the invention is to improve the accuracy of labeling.

The goal is achieved in that the device 20

equipped with a block for determining the time of passing the photometric midpoint of the stroke with an exemplary dash measure connected between the reproduction channel and block 2

control unit, and the input unit of the programmed delays of the moment of marking, corresponding to the amendments to the certified error of the position of each line of the exemplary stroke measure, connected between the control unit and the power supply unit.

The drawing schematically shows the proposed device.

The device contains an exemplary dash measure 1, a movable stage 2, a printing unit 3 that serves for marking (for example, a photographic method) and consisting of a radiation source 4 (for example, a discharge lamp, a quantum generator), a capacitor 5, orifice plate 6, made with taking into account the scale of projection in the form of an enlarged image of the applied label, and a projection lens 7, projecting the image of the diaphragm 6 onto the surface of the photosensitive layer 8 of the workpiece 9, placed on the same subject table 2 as razdovaya line measure 1, in compliance with the principle of Abbe. To determine the position of the strokes, an exemplary stroke measure 1 serves as a channel to play 756206

10, consisting of a lens 11, aperture 12, a condenser 13, a photodetector 14 (for example, a photodiode, a photomultiplier) and an illuminator used to illuminate an exemplary stroke measure 1. The photoreceiver 14 is connected to the input of the block 15 for determining the moment of passing the photometric midpoint of the stroke with an exemplary stroke measure 1, consisting of a low-pass filter 16, a differentiator 17, a zero-body 18 and a driver 19. The block 15 is electrically connected to the control unit 20, the block 21 of the programmed delays for applying the label and the power supply unit 22 i and radiation source control 4.

The device works as follows.

When the device is turned on, table 2 moves at a constant speed. · At the same time, under the optical axis of the playback channel 10, there are strokes of an exemplary stroke measure 1 (starting from the 0th stroke). With the passage of the stroke in the working field of the optical scheme of the playback channel, the latter projects the invention of the stroke into the plane of the fixed diaphragm 12 located in front of the photodetector 14. A pulse of a bell-shaped photocurrent arises in the load circuit of the photoreceiver. The signal from the photodetector 14 is fed to the input of the block 15. The electrical circuit of the block 15 uses the method of determining the reference pulse from the extremum point of the bell-shaped signal corresponding to the photometric middle of the optical image of the stroke. The signal from the photodetector 14 is fed to the input of the filter 16 of the lower frequencies. The filtered signal enters the scheme 17 of differentiation. The differentiated signal arrives at the null-organ 18, which determines the instant of a change in the sign of the derivative, which is represented by the imaging unit 18 as a readout pulse, which enters the control unit 20. Block 20 determines which stroke of an exemplary stroke measure 2 passes under the optical axis of the playback channel and issues a command to the block 21 for inputting the programmed delays in marking the input to the desired signal delay corresponding to the value of the error in the position of the passing stroke (taking into account the sign of this error).

The signal delayed in block 21 is sent to block 22, which gives the command to turn on the radiation source 4, which with the help of capacitor 5 illuminates the diaphragm 6, the image of which is projected onto the surface of the photosensitive layer 8 of the workpiece 9 by the lens. This causes the marking. When combining the center of the next stroke with an exemplary dash measure 1 with the optical axis of the playback channel, the cycle repeats.

Thus, due to the fact that the center of the stroke of an exemplary stroke measure is accurately determined in the device and an amendment to the error of its position is introduced, marks are placed on the workpiece without copying the error position of the strokes of an exemplary stroke measure. The position of the strokes of exemplary stroke measures up to 200 mm long are certified with an accuracy of 0.0001mm.

Claims (1)

Claim A device for applying marks on a scale containing a movable stage with attached exemplary dash measure and blank, a reproduction channel, a control unit, a power supply unit connected in series and a printing unit, characterized in that, in order to improve the accuracy of marking, it is equipped with a block method of determining the time of passage of the photometric midpoint of the stroke of an exemplary stroke measure connected between the playback channel and the control unit, and the input unit of the programmed moment delays n Removing the label connected between the control unit and the power supply.