CA2061278A1 - Device for determining the thickness of a fluid film - Google Patents
Device for determining the thickness of a fluid filmInfo
- Publication number
- CA2061278A1 CA2061278A1 CA 2061278 CA2061278A CA2061278A1 CA 2061278 A1 CA2061278 A1 CA 2061278A1 CA 2061278 CA2061278 CA 2061278 CA 2061278 A CA2061278 A CA 2061278A CA 2061278 A1 CA2061278 A1 CA 2061278A1
- Authority
- CA
- Canada
- Prior art keywords
- emitter
- thickness
- fluid
- printing
- dampening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/02—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
- G01B15/025—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness by measuring absorption
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Control Of Non-Electrical Variables (AREA)
- Rotary Presses (AREA)
Abstract
A-791 31.01.1992 - 9 - mo.a791 A B S T R A C T
The invention relates to a device for determining the fluid amount or the thickness of a fluid film, representing the quantity measured, particularly the thickness of the dampening-medium film provided on the surface of a printing forme of a printing machine, particularly of an offset printing machine. Said device preferably comprises an emitter operating in the microwave range the emitting frequency range of which impinges on said fluid (7) and has such a low power that the energy absorbed by said fluid (7) measurably influences the power input of the emitter (9), the power input varying depending on the respective fluid amount or the thickness of the fluid film being used as a scale for the quantity measured.
Fig. 1
The invention relates to a device for determining the fluid amount or the thickness of a fluid film, representing the quantity measured, particularly the thickness of the dampening-medium film provided on the surface of a printing forme of a printing machine, particularly of an offset printing machine. Said device preferably comprises an emitter operating in the microwave range the emitting frequency range of which impinges on said fluid (7) and has such a low power that the energy absorbed by said fluid (7) measurably influences the power input of the emitter (9), the power input varying depending on the respective fluid amount or the thickness of the fluid film being used as a scale for the quantity measured.
Fig. 1
Description
A-791 31.01.1992 - 1 - mo.a791 Device for determining ~he thickness of a fluid film The invention relates to a device for determining the thickness of a fluid film, particularly the thickness of the dampening-medium film prov~ded on the surface of a printing forme of an offset printing machine.
The supply of a certain dampening-medium amount onto the surface of the printing forme of a printing machine is essential for achieving a good print quality. According to the amount of dampening medium supplied a respective thickness of the dampening-medium film is formed. If this thickness of the dampening-medium film which depends on various parameters, e.g.
the temperature, the printing speed, the type of the printing forme etc. and which is provided on the surface of the printing forme is determined, it may be compared with a reference value and be adjusted accordingly, if necessary.
It is the object of the invention to provide a device of the above-mentioned type by means of which the amount or the thickness of a fluid film, particularly the thickness of a dampening-medium film provided on the surface of a printing forme, may be determined in an uncomplicated manner.
According to the invention this object is achieved in that a emitter emitting radiation the wavelength of which lies in an absorbing range of the fluid is positioned in proximity to the dampened surface of the printing plate, in that the power input of the emitter varies as a function of the radiation absorbed, and in that this change is used as a measure for the thickness of the fluid film provided on the printing plate.
Consequently, according to the invention, there is an inter-connection between the frequency range of the emitter and the fluid, the working condition of the emitter resulting from said interconnection being a scale for the quantity measured. At the A-791 31.01.1992 - 2 - mo.a791 same time, the emitter thus represents a receiver, not in the electrotechnical sense of the word, it rather means that the amount or the thickness of the fluid film exerts an influence on the emitter, an influence which represents a reaction which may be interpreted by a receiver like the reception of emitter signals. With the subject-matter of the invention advantage is taken of the fact that depending on the amount or the thickness of the fluid film emitting energy is taken from the emitter, which results in a respective power input of the emitter, particularly in a resonant-circuit power input. If the amount or the thickness of the fluid film increases, thus consuming more emitter energy, the power input increases as well. However, this effect can only be satisfyingly measured, if the emitter power is no~ much greater than the energy absorbed by the fluid.
According to the invention the power of the emitter has to be so low that the energy absorbed by the fluid measurably influences the power input of the emitter. Thus, the emitter can be compared with a battery having a high internal reslstance the voltage of which decreases accordingly, even given a relatively small load.
According to a development of the invention the radiation emitted by the emitter lies in the microwave range. Furthermore, the minimal power irradiated guarantees that the fluid is heated not at all or only insignificantly.
Moreover, it is advantageous to provide the emitter with an emitting antenna arrangement which is disposed slightly before the printing plate of a rotating plate cylinder of the printing machine. Owing to the device according to the invention the amount or the thickness of the fluid film may be ascertained even during the rotating motion of the plate cylinder.
According to another development of the invention the emitter provided with an emitting antenna arrangement irradiating a plurality of areas on the printing-plate surface which are A-791 31 ~Q ~ ~278 - 3 - mo.a791 spaced apart, thus permitting the averaging of the quantities measured in the respective areas. If the quantity measured ls to be ascertained in the form of an averaged value over the entire printing plate, it is advantageous to design the emitting antenna arrangement as a strip-like antenna extending preferably over the entire width of the printing plate.
Alternatively it is, however, also conceivable to provide a plurality of emitters the antennas of which irradiate areas spaced apart on the surface of the printing plate. Thus, it is possible to ascertain a respective quantity measured in each of said areas, thus permitting, for example, a zonal determination of the dampening-medium amount provided on the surface of the printing forme.
The drawing shows the invention with reference to specimen embodiments.
Fig. 1 is a schematic representation of a device for determining the amount or the thickness of a dampening-medium film provided on the surface of a printing forme, Fig. 2 shows a device of the above-mentioned type comprising an emitting antenna arrangement which irradiates a plurality of areas on the surface of a printing forme, and Fig. 3 shows an embodiment, similar to the one illustrated in Fig. 2, comprising a strip-like antenna.
Fig. 1 shows a schematic representation (block diagram) of a device 1 by means of which the amount or the thickness of the film of a dampening medium 2 or a fluid 7 provided on the surface 3 of a print.ing forme 4 is determined. Said printing forme 4 is designed as a printing plate 5 mounted on a plate A-791 31.01.1992 - 4 - mo.a791 cylinder 6 of an offset printing machine not illustrated in greater detail. The dampening medium 2 mainly consists of water.
An emitting antenna arrangement 8 connected to an emitter 9 is provided at a slight distance to the surface 3 and thus to the fluid 7. Preferably the emitter 9 is a microwave emitter. The emitting energy irradiated by the emitter 9 corresponds to a certain power input of the emitter 9, particularly to a certain resonant-circuit power input. An amperemeter 10 is provided to determine the power input. Said amperemeter is connected to a display 11 indicating the amount or the thickness of the fluid film 7 which is provided on the surface 3 of the printing forme 4 and which corresponds to the respective power input. Moreover, the amperemeter 10 is connected to a controller 12, thus supplying said controller 12 with an actual value. Furthermore, a reference value 13 of the desired dampening-medium amount, provided on the surface 3 of the printing forme 4, is fed to the controller 12. The output of the controller 12 is connected to an adjusting means 14 which meters the dampening medium i.e. the fluid applied on the surface 3 of the printing forme 4.
The device according to the invention operates as follows:
Depending on the dampening-medium amount provided on the surface 3 of the printing forme 4 a varying degree of emitter energy is taken from the emitter 9, which results in a corresponding power input. This power input is registered by the amperemeter 10 with respect to its quantity; consequently, it represents a measure for the emitting energy and thus a measure for the amount or the thickness of the fluid film 7 on the surface 3 of the printing forme 4. The power of the emitter 9 is adjusted such that it is not much greater than the engery absorbed by the molecules (particularly ~he water molecules) of the fluid 7, particularly of the dampening medium 2. This guarantees that, on the one hand, it is possible to determine a sufficiently exact measuring result and, on the other hand, that the dampening medium 2 is -A-791 31.01.1992 - 5 - mo.a791 heated not at all or only insignificantly. The ascertained quantity measured is indicated on the display 11 and serves as the actual value of the controller 12. Said actual value is compared with the reference value 13, and in the case of a control deviation the controller 12 activates the adjusting means 14 such that the amount or the thickness of the dampening medium on the surface 3 of the printing forme 4 is ad~usted on the basis of the set reference value 13.
Fig. 2, too, shows an emitter 9 which is connected to an antenna arrangement 8 comprising a plurality of emitting stations 15 so that a plurality of areas spaced apart on the surface 3 of the printing forme 4 are irradiated. On the whole, it is thus possible to register an averaged quantity measured l.e. the amount or the thickness of the fluid film 7 is ascertained, in the form of an averaged value of the thickness of the dampening-medium film, in the irradiated areas of the surface 3 of the printing forme 4.
Fig. 3 represents the emitting antenna arrangement 8 designed as a strip-like antenna extending over the entire width of the printing plate 5, whereby the averaged dampening-medium amount applied on the entire printing plate 5 is determined.
In an alternative specimen embodiment which is not illustrated each of a plurality of emitters 9 is provided with an antenna irradiating different areas on the surface of the printing forme. Thus, it is possible to determine, in certain areas of a non-rotating printing forme, the respective dampening-medium amount or the thickness of the dampening-medium film or, with respect to a rotating printing plate, the averaged zonal amount of dampening medium or the thickness of the dampening-medium film.
The supply of a certain dampening-medium amount onto the surface of the printing forme of a printing machine is essential for achieving a good print quality. According to the amount of dampening medium supplied a respective thickness of the dampening-medium film is formed. If this thickness of the dampening-medium film which depends on various parameters, e.g.
the temperature, the printing speed, the type of the printing forme etc. and which is provided on the surface of the printing forme is determined, it may be compared with a reference value and be adjusted accordingly, if necessary.
It is the object of the invention to provide a device of the above-mentioned type by means of which the amount or the thickness of a fluid film, particularly the thickness of a dampening-medium film provided on the surface of a printing forme, may be determined in an uncomplicated manner.
According to the invention this object is achieved in that a emitter emitting radiation the wavelength of which lies in an absorbing range of the fluid is positioned in proximity to the dampened surface of the printing plate, in that the power input of the emitter varies as a function of the radiation absorbed, and in that this change is used as a measure for the thickness of the fluid film provided on the printing plate.
Consequently, according to the invention, there is an inter-connection between the frequency range of the emitter and the fluid, the working condition of the emitter resulting from said interconnection being a scale for the quantity measured. At the A-791 31.01.1992 - 2 - mo.a791 same time, the emitter thus represents a receiver, not in the electrotechnical sense of the word, it rather means that the amount or the thickness of the fluid film exerts an influence on the emitter, an influence which represents a reaction which may be interpreted by a receiver like the reception of emitter signals. With the subject-matter of the invention advantage is taken of the fact that depending on the amount or the thickness of the fluid film emitting energy is taken from the emitter, which results in a respective power input of the emitter, particularly in a resonant-circuit power input. If the amount or the thickness of the fluid film increases, thus consuming more emitter energy, the power input increases as well. However, this effect can only be satisfyingly measured, if the emitter power is no~ much greater than the energy absorbed by the fluid.
According to the invention the power of the emitter has to be so low that the energy absorbed by the fluid measurably influences the power input of the emitter. Thus, the emitter can be compared with a battery having a high internal reslstance the voltage of which decreases accordingly, even given a relatively small load.
According to a development of the invention the radiation emitted by the emitter lies in the microwave range. Furthermore, the minimal power irradiated guarantees that the fluid is heated not at all or only insignificantly.
Moreover, it is advantageous to provide the emitter with an emitting antenna arrangement which is disposed slightly before the printing plate of a rotating plate cylinder of the printing machine. Owing to the device according to the invention the amount or the thickness of the fluid film may be ascertained even during the rotating motion of the plate cylinder.
According to another development of the invention the emitter provided with an emitting antenna arrangement irradiating a plurality of areas on the printing-plate surface which are A-791 31 ~Q ~ ~278 - 3 - mo.a791 spaced apart, thus permitting the averaging of the quantities measured in the respective areas. If the quantity measured ls to be ascertained in the form of an averaged value over the entire printing plate, it is advantageous to design the emitting antenna arrangement as a strip-like antenna extending preferably over the entire width of the printing plate.
Alternatively it is, however, also conceivable to provide a plurality of emitters the antennas of which irradiate areas spaced apart on the surface of the printing plate. Thus, it is possible to ascertain a respective quantity measured in each of said areas, thus permitting, for example, a zonal determination of the dampening-medium amount provided on the surface of the printing forme.
The drawing shows the invention with reference to specimen embodiments.
Fig. 1 is a schematic representation of a device for determining the amount or the thickness of a dampening-medium film provided on the surface of a printing forme, Fig. 2 shows a device of the above-mentioned type comprising an emitting antenna arrangement which irradiates a plurality of areas on the surface of a printing forme, and Fig. 3 shows an embodiment, similar to the one illustrated in Fig. 2, comprising a strip-like antenna.
Fig. 1 shows a schematic representation (block diagram) of a device 1 by means of which the amount or the thickness of the film of a dampening medium 2 or a fluid 7 provided on the surface 3 of a print.ing forme 4 is determined. Said printing forme 4 is designed as a printing plate 5 mounted on a plate A-791 31.01.1992 - 4 - mo.a791 cylinder 6 of an offset printing machine not illustrated in greater detail. The dampening medium 2 mainly consists of water.
An emitting antenna arrangement 8 connected to an emitter 9 is provided at a slight distance to the surface 3 and thus to the fluid 7. Preferably the emitter 9 is a microwave emitter. The emitting energy irradiated by the emitter 9 corresponds to a certain power input of the emitter 9, particularly to a certain resonant-circuit power input. An amperemeter 10 is provided to determine the power input. Said amperemeter is connected to a display 11 indicating the amount or the thickness of the fluid film 7 which is provided on the surface 3 of the printing forme 4 and which corresponds to the respective power input. Moreover, the amperemeter 10 is connected to a controller 12, thus supplying said controller 12 with an actual value. Furthermore, a reference value 13 of the desired dampening-medium amount, provided on the surface 3 of the printing forme 4, is fed to the controller 12. The output of the controller 12 is connected to an adjusting means 14 which meters the dampening medium i.e. the fluid applied on the surface 3 of the printing forme 4.
The device according to the invention operates as follows:
Depending on the dampening-medium amount provided on the surface 3 of the printing forme 4 a varying degree of emitter energy is taken from the emitter 9, which results in a corresponding power input. This power input is registered by the amperemeter 10 with respect to its quantity; consequently, it represents a measure for the emitting energy and thus a measure for the amount or the thickness of the fluid film 7 on the surface 3 of the printing forme 4. The power of the emitter 9 is adjusted such that it is not much greater than the engery absorbed by the molecules (particularly ~he water molecules) of the fluid 7, particularly of the dampening medium 2. This guarantees that, on the one hand, it is possible to determine a sufficiently exact measuring result and, on the other hand, that the dampening medium 2 is -A-791 31.01.1992 - 5 - mo.a791 heated not at all or only insignificantly. The ascertained quantity measured is indicated on the display 11 and serves as the actual value of the controller 12. Said actual value is compared with the reference value 13, and in the case of a control deviation the controller 12 activates the adjusting means 14 such that the amount or the thickness of the dampening medium on the surface 3 of the printing forme 4 is ad~usted on the basis of the set reference value 13.
Fig. 2, too, shows an emitter 9 which is connected to an antenna arrangement 8 comprising a plurality of emitting stations 15 so that a plurality of areas spaced apart on the surface 3 of the printing forme 4 are irradiated. On the whole, it is thus possible to register an averaged quantity measured l.e. the amount or the thickness of the fluid film 7 is ascertained, in the form of an averaged value of the thickness of the dampening-medium film, in the irradiated areas of the surface 3 of the printing forme 4.
Fig. 3 represents the emitting antenna arrangement 8 designed as a strip-like antenna extending over the entire width of the printing plate 5, whereby the averaged dampening-medium amount applied on the entire printing plate 5 is determined.
In an alternative specimen embodiment which is not illustrated each of a plurality of emitters 9 is provided with an antenna irradiating different areas on the surface of the printing forme. Thus, it is possible to determine, in certain areas of a non-rotating printing forme, the respective dampening-medium amount or the thickness of the dampening-medium film or, with respect to a rotating printing plate, the averaged zonal amount of dampening medium or the thickness of the dampening-medium film.
Claims (8)
1. Device for determining the thickness of a fluid film, particularly the thickness of a dampening-medium film provided on the surface of a printing forme of an offset printing machine, characterized in that an emitter (9) emitting radiation of a wavelength which lies in an absorbing range of a fluid (7) is positioned in proximity to the dampened surface (3) of a printing plate (5), that the power input of said emitter (9) varies as a function of the radiation absorbed, and that this change is used as a measure for the thickness of the fluid film on said printing plate (5).
2. Device according to Claim 1, characterized in that the emitter (9) emits radiation lying in the microwave range.
3. Device according to Claim 1, characterized in that the power is so minimal that the fluid (7) is heated not at all or only insignificantly.
4. Device according to anyone of the preceding claims, characterized in that the emitter (9) comprises an emitting antenna arrangement (8) which is preferably provided at a slight distance to the printing plate (5) of a plate cylinder (6), preferably rotating, of the printing machine.
A-791 31.01.1992 - 7 - mo.a791
A-791 31.01.1992 - 7 - mo.a791
5. Device according to anyone of the preceding claims, characterized in that the emitting antenna arrangement (8) irradiates a plurality of areas spaced apart on the surface (3) of the printing forme (4).
6. Device according to anyone of the preceding claims, characterized in that the emitting antenna arrangement (8) is designed as a strip-like antenna extending preferably over the entire width of the printing plate (6).
7. Device according to anyone of the preceding claims, characterized in that there is provided a plurality of emitters (9) the antennas of which irradiate areas spaced apart on the surface (3) of the printing plate (5).
8. Device according to anyone of the preceding claims, characterized in that the quantity measured is fed, in the form of an actual value, to a control device (controller 12) which adjusts the dampening-medium amount provided on the surface (3) of the printing forme (4).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914110786 DE4110786C2 (en) | 1991-04-04 | 1991-04-04 | Device for determining the layer thickness of a dampening solution |
| DEP4110786.1 | 1991-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2061278A1 true CA2061278A1 (en) | 1992-10-05 |
Family
ID=6428743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2061278 Abandoned CA2061278A1 (en) | 1991-04-04 | 1992-02-14 | Device for determining the thickness of a fluid film |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2564072B2 (en) |
| CA (1) | CA2061278A1 (en) |
| DE (1) | DE4110786C2 (en) |
| GB (1) | GB2254438B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19737785C2 (en) * | 1997-08-29 | 2002-09-26 | Heidelberger Druckmasch Ag | Rotary printing machine with a coating unit and a dryer downstream of the coating unit |
| DE10206944A1 (en) * | 2002-02-19 | 2003-09-04 | Oce Printing Systems Gmbh | Method and device for printing, the thickness of the dampening solution layer being measured and reduced |
| CN110470464B (en) * | 2019-09-10 | 2021-04-13 | 中航飞机起落架有限责任公司 | Main wheel turning ground control torque measuring device and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4470123A (en) * | 1982-01-05 | 1984-09-04 | Miami R & D Limited Partnership | Microwave ice accretion meter |
| DE3316477C2 (en) * | 1983-05-05 | 1985-09-19 | Grapho Metronic Meß- und Regeltechnik GmbH & Co KG, 8000 München | Device for operational measurement of the layer thickness of the dampening solution on the printing plate in the printing unit of a rotary offset printing machine |
| DD275923A1 (en) * | 1988-09-28 | 1990-02-07 | Bauakademie Ddr | HOLLOWING SPOTLIGHT FOR MICROWAVE HUMIDITY MEASUREMENT |
| DE3940710A1 (en) * | 1989-12-09 | 1991-06-13 | Tzn Forschung & Entwicklung | DEVICE FOR DETERMINING THE MEDIUM WATER FILM THICKNESS ON ROAD SURFACES |
-
1991
- 1991-04-04 DE DE19914110786 patent/DE4110786C2/en not_active Expired - Fee Related
-
1992
- 1992-02-14 CA CA 2061278 patent/CA2061278A1/en not_active Abandoned
- 1992-04-02 JP JP4108466A patent/JP2564072B2/en not_active Expired - Fee Related
- 1992-04-03 GB GB9207375A patent/GB2254438B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB9207375D0 (en) | 1992-05-13 |
| DE4110786A1 (en) | 1992-10-15 |
| GB2254438A (en) | 1992-10-07 |
| JP2564072B2 (en) | 1996-12-18 |
| GB2254438B (en) | 1995-02-15 |
| DE4110786C2 (en) | 1996-06-13 |
| JPH05133731A (en) | 1993-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |