SU931482A1 - Automatic engraving machine - Google Patents

Description

(54) ENGRAVING AUTOMATIC MACHINE

one

The invention relates to engraving machines and can be used for engraving printing plates.

An engraving machine is known, which comprises an engraving cutter unit connected to a pickle displacement sensor and an output of a power amplifier.

The disadvantage of the known automaton is the low quality of the engraving works.

The purpose of the invention is to improve the quality of engraving works.

The goal is achieved by the fact that the engraving machine containing the engraving cutter block connected to the cutter displacement sensor and the output of the power amplifier has a control signal former, a comparator unit, a low-pass filter, a differential amplifier, a memory unit and an indicator, while the information output the engraving cutter unit is connected via an indicator to the first input of the memory unit, the second input of which is connected to the output of the pickup displacement sensor and the first input of the differential amplifier, connecting A second input to the output of the memory block, output

a differential amplifier through a serially connected low-pass filter; a comparator unit and a control signal driver connected to the input of the power amplifier.

5 FIG. 1 depicts functional

circuit machine; in fig. 2 - signal plots.

Engraving machine contains block engraving cutter, which includes

Q into itself. Electromagnetic drive 1 of the cutter, cutter 2, radiation source 3 and printing plate 4. This unit is connected to the cutter displacement sensor 5 and the output of power amplifier 6.

The device also has a driver 7

Claims (1)

15 of the control signal, comparator unit 8, low-pass filter 9, differential amplifier 10, memory unit 11 and indicator 12, while the information output 13 of the engraving cutter unit is connected via the in2Q indicator 12 to the first input of the memory unit 11, the second input of which connected to the first input of the memory block I1, the second input of which is connected to the output of the cutter displacement sensor 5 and the first input of the differential amplifier 10 connected to the output of the memory block 11 by the second input, output. the differential amplifier 10 is connected via a sequentially connected low-pass filter 9, a comparison unit 8 and a control signal generator 7 are connected to the input of the power amplifier 6. FIG. 2 are designated: id (D) is the voltage at the output of the pickup displacement sensor (where A is the displacement of the movable part of the engraving head); ti is the moment when the tool enters the material of the printed mold; t is the moment when the cutter leaves the plate material, the voltage at the output of the contact indicator 12, Ugbix. - voltage at the output of the differential amplifier 10, UV - voltage at the output of the filter 9, Uon. - the voltage of the reference signal corresponding to the desired engraving depth. The radiation source 3 may be active (for example, a compact LED) or passive (for example, a polished face, illuminated by a special source). The source 3 is rigidly attached to the movable part of the engraving head. The indicator of contact 12 can be performed in the simplest case as a relay that is triggered if the cutter electrical circuit closes - the printed form (in this case, in the initial position, the cutter and the shape must be electrically isolated from each other). The cutter displacement sensor 5 is rigidly coupled with the fixed part of the engraving head, relative to which the movable part performs a reciprocating motion. The output of the sensor 5 is connected to the memory unit 11, to which the indicator 12 of the contact is also connected. The outputs of the And block and the sensor 5 are connected to the inputs of the differential amplifier 10, which is connected to the serially connected filter 9, the comparison block 8, the control signal generator 7 and the power amplifier 6. The driver 7 of the control signal is also supplied with voltage UET, coming from the electronic section of the engraving machine. The output of the power amplifier 6 is connected to the input of the electromagnetic drive 1 of the cutter. The proposed device works as follows. The movement sensor 5 has a linear coordinate characteristic of the type Ud (A) (Fig. 2a). The signal at the output of the displacement sensor 5 varies in accordance with the position of the radiation source 3 relative to the optical axis of the sensor 5. Suppose that the cutter 2 reciprocates in time according to a periodic law (Fig. 2a). The contact indicator 12 generates a positive polarity signal (+ 1) when there is a contact of the cutter 2 with a printing form 4 (time intervals from ti to t) and a zero signal (0) when there is no such contact (Fig. 26). The signals from sensor 5 and contact indicator 12 are fed to the input of memory block 11. At the same time, a constant signal is generated at the output of the filter 9 with an amplitude proportional to the movement of the cutter 2 in the material of the printing form 4. This is achieved as follows. The signal at the output of the block repeats the input signal (the signal from sensor 5) if the signal from the contact indicator 12 is zero and has a constant value equal to the value of the input signal at the moment the signal from the contact indicator 12 appears (at time t)). This time t corresponds to the input of the cutter 2 in the form 4. After the exit of the cutter 2 from the form 4 (moment 12), the storage is reset. At the output of the differential amplifier 10, a difference is formed between the current value of the signal from the output of the displacement sensor 5 and the signal from the output of block 11. This difference is different from zero in the time interval from t to t2, because during this time interval the signal from the output of block 11 does not changes and corresponds to the value of the signal of the displacement sensor 5 at the moment the cutter 2 enters the printing plate 4. The amplitude of the periodic signal UBWX. at the output of the differential amplifier 10 (Fig. 20) is proportional to the movement of the cutter 2 in the form 4, i.e. engraving depth. This signal is smoothed by the low-pass filter 9 (Uq, Fig. 2d) and is fed to the input of the comparator unit 8, to the other input of which a constant reference signal UOR is applied. corresponding to the required depth of engraving. When the value of the signal Zf deviates from the value of the reference signal Uon. At the output of the comparator unit 8, a difference signal Uon.-Uj (Fig. 2e) is formed, which is fed to the input of the driver 7 of the control signal. The signal from the electronic path of the engraving machine arrives at the other input of the same block. As a result, the output of the block 7 forms a signal in the form convenient for controlling the power amplifier 6, which supplies the electromagnetic drive 1 of the cutter. The use of the proposed device allows improving the quality of engraving works. An engraving machine comprising an engraving cutter unit connected to a cutter displacement sensor and a power amplifier output, characterized in that, in order to improve the quality of engraving work, it has a control signal former, a low pass filter, a differential amplifier, a block memory and indicator, while the information output of the engraving cutter is connected via an indicator to the first input of the memory unit, the second input of which is connected to the output of the pickup displacement sensor and the first input of the differential amplifier connected by the second input to the output of the memory block, the output of the differential amplifier through the series-connected low-pass filter, block Comparison and driver control signal is connected to the input of the power amplifier. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 116376, cl. B 41 C 1/02, 1958.