DE1901073A1 - Device for controlling and measuring the depth of the printing cylinder - Google Patents

Description

"Device for controlling and measuring the etching depth of printing cylinders" Addendum to patent. ... ... from 13.1.68 (file number P 16 71 505.2) The patent 1 253 280 relates to a method for measuring the etching depth of printing cylinders or the like. without interrupting the etching process and consists in that the cylinder surface respectively.

the etched layer with non-contact sensors versus a metallic one DUT on inductive goat in interaction with suitable voltage sources and amplifiers is sampled. I.a. it was proposed to measure a series of two or several different etching points with a time query and the corresponding To perform temperature or concentration control of the etchant, a query after time there are certain disadvantages, since different etchings differ Times are registered, some of which differ from one another in terms of time.

The additional patent. ... ... (Ref. P 16 71 505.2) to the above Patent relates to an improvement in connection with the use of several Etching points, namely this finding consists in the fact that a measurement of two or several different etching points by querying the gradation curve in this way it is carried out that, first of all, an interrogation of the etching progress is made in the etching stages to be measured initiated and controlled and after a comparison with setpoints by a logical Linking a control of the temperature or concentration of the etching liquid or a control of the rotational speed of the printing cylinder is performed will.

The measurements are mainly of the copper mining in the respective Stages initiated and controlled, with a difference between the actual and Setpoint the corresponding signals too low or too low and gained to one Correction was used, whereupon this measurement sequence was repeated several times with other levels and Setpoint values are carried out over the entire etching process until the end of the etching will.

The present invention relates to an improved practical embodiment for controlling and measuring aer etching depth, namely this invention consists in that an electronic switch is switched between the amplifier and the memory and this switch is also used for programming and setting the device to be made is connected to the desired setpoint measured values, while the localization device with a code disk known per se directly is firmly attached to the printing cylinder axis and a device for scanning the angle measurements adapted to the control strip are connected to the device, a line leads from em to the arithmetic logic device.

An extremely high reproducibility results with a low reject rate the etching.

The accompanying drawing shows an exemplary embodiment of the subject matter of the invention, namely Fig. 1 is a partial view of a printing cylinder Fig. 2 shows a circuit arrangement in a schematic representation.

With 1 is primarily the steel core of a printing cylinder referred to, over which a round copper layer 2 is located. over this is the Etching layer 3 applied.

An inductive displacement transducer can be selected as the transducer, which contactless measurement of an etching layer applied to the printing cylinder 1, 2 allowed. With the print template to be etched, control or Reference levels, d. H. so-called control strips 3a, preferably in the trimming zone, cited. The measurement of the etching 3c can because of the differences between the individual Etching templates only made in control or reference levels 3a. be, where one sensor 4a is above the steps 3a to be measured, while the other sensor 4b is located above an adjacent unetched zone 3b. The distance of the The sensor to the printing cylinder should be about a few tenths of a millimeter.

The two receptacles 4a, 4b are connected in push-pull, d. H.

they are actively arranged opposite the printing cylinder surface. These Push-pull circuit allows greater sensitivity and better linearity. The measurement signal recorded at the transducers 4a, 4b is stored in a carrier frequency measurement bridge 6 geonen, us from here enters an amplifier. 7 and then via a electronic switch 11, also called chopter, into memory S.

Via a localization device 5, å. H. a facility for Finding and measuring the appropriate measurement levels, each level becomes a control strip 3a registered.

This localization device 5 can, for. 3. from one in industrial electronics known digital position measuring device exist in the form of an angle encoder. This registers the measurement levels of the control strip 3a on a code disk 13 to analog angular quantities 12. This condenser disk 13 is on the axis 14 of the pressure cylinder 1 firmly attached.

The angle measurement on the code disk 13 can be any suitable one, e.g. 3. with magnetic marks, register marks or in a photoelectric way 15 are scanned. From here a line 16 leads to one, to the electronic one Switch 11 connected device 10.

In this device 10 both the program to be carried out must be carried out beforehand entered, szls 1 Search made the settings of the desired target measured values will.

For example, up to five or more nominal measured values can be used optionally programmed.

The device 5 keys - due to the program - in the period in which If the level to be measured is under the sensors 4a, 4b, switch 11 and the measured value is stored in memory 8.

@@ The output of the memory 8 then results in one of the measured etching level analog signal on control strip 3a.

The duration of the measurement can be extended to several revolutions. The signal obtained passes into a computation logic 9, at the output of which the signals "RIC @ TIG", "TOO DEEP" or "TOO FLAT" can be removed. About these decisions As already stated above, the setpoints at 10 are entered, which are then compared with the measurement signal and corresponding statements to lead. For this purpose there is a connection 17 from the device 10 to the device 9.

The setpoint for each stage can be selected from two values, one minimal and a maximum consist. If the measured value lies between these two values, then If the logic 9 makes the decision "RIGHT", if it is smaller, the signal comes "TOO FLAT", he lies above, results in the signal "TOO LOW". These signals can can be used to correct the etching.

The condition of the etching is correspondingly when the last stage is addressed the so-called lights displayed on the control strip 3a are initiated.

Claim

Claims (1)

Device for controlling and measuring the etching depth of Pressure cylinders or the like. without interrupting the etching process, with a measurement of two or more different etching points by querying the gradation process is carried out in such a way that a query is first made in the etching stages to be measured of the etching progress initiated and controlled and after a comparison with target values a control of the temperature or concentration through a logical link the etching liquid or a control of the rotational speed of the printing cylinder is carried out, according to patent (file number P 16 71 505.2), characterized in that that an electronic switch (11) between the amplifier (7) and the memory (8) is switched on, and this switch (11) is also used for programming and @ @ setting the desired target measured values in connection with the device (10) stands, while the localization device (5) with a code disk known per se (13) is firmly attached directly to the printing cylinder axis (14) and a device (15) for scanning the angle measurements adapted to the control strip (3a) the device (10) is connected, from which a line (17) to the arithmetic logic device (9) leads.