EP0383590A2 - A fluid supply device, a fluid supply system and a method of supplying fluid to a printing roller - Google Patents

A fluid supply device, a fluid supply system and a method of supplying fluid to a printing roller Download PDF

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Publication number
EP0383590A2
EP0383590A2 EP90301605A EP90301605A EP0383590A2 EP 0383590 A2 EP0383590 A2 EP 0383590A2 EP 90301605 A EP90301605 A EP 90301605A EP 90301605 A EP90301605 A EP 90301605A EP 0383590 A2 EP0383590 A2 EP 0383590A2
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EP
European Patent Office
Prior art keywords
fluid
supply device
fluid supply
opening
outlet opening
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.)
Withdrawn
Application number
EP90301605A
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German (de)
French (fr)
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EP0383590A3 (en
Inventor
Geoffrey Roger Peter Grantham
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Individual
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Individual
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Publication date
Priority claimed from GB898903417A external-priority patent/GB8903417D0/en
Application filed by Individual filed Critical Individual
Publication of EP0383590A2 publication Critical patent/EP0383590A2/en
Publication of EP0383590A3 publication Critical patent/EP0383590A3/en
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F31/00Inking arrangements or devices
    • B41F31/002Heating or cooling of ink or ink rollers

Definitions

  • the invention relates to a fluid supply device, a fluid supp!y system and a method of supplying fluid to a printing roller.
  • a printing plate on a printing cylinder includes a deposited layer of a composition including silicon. Ink is rejected bv the layer and is picked up elsewhere on the cylinder. No water or other liquid other than the ink is used. In this technique however, if the layer becomes heated, as will tend to occur in use, then the layer will lose its ability to reject ink and will instead pick it up so that the whole printing plate picks up ink. There is thus a need for a device which will cool a printing cylinder in use, but will not affect e.g. the distribution of the ink picked up on the printing plate.
  • a fluid supply device comprising a hollow body defining an inlet opening for the introduction of fluid under pressure, and at least one outlet opening characterised in that inhibiting means is provided for inhibiting turbulence in fluid introduced into the body such that in use the rate of outwards fluid flow along the outlet opening or through the or any two of the outlet openings is substantially the same.
  • the device in the case where the device is used adjacent a printing cylinder arranged for lithographic printing, it will provide an even drying effect over the cylinder surface. Similarly, the even flow of air will not affect the ink distribution on the surface of a printing cylinder.
  • the inhibiting means may comprise valve means for releasing fluid from the body.
  • the valve means is provided at an opposite part of the body to the inlet opening.
  • the valve means preferably comprises a needle valve.
  • the inhibiting means may comprise a baffle.
  • the baffle may take any suitable form and may comprise swarf or the like suitably trapped in the body or may comprise a baffle plate.
  • the baffle comprises a filter unit.
  • a fluid supply device comprising a hollow body defining an inlet opening for the introduction of fluid under pressure into the body, an outlet opening and a compensation opening, the device also including closing means for closing the outlet opening and the compensation opening, the outlet opening and the compensation opening being such that, in use, when the outlet opening is closed by the closing means and the compensation opening is open, the rate of flow of fluid through the compensation opening is substantially the same as the rate of flow of fluid through the outlet opening when the outlet opening is open and the compensation opening is closed by the closing means.
  • the rate of flow of fluid out of the body can be kept constant.
  • the compensation opening is provided at substantially the same distance from the inlet opening as the outlet opening.
  • the closing means is arranged such that when it is in the position to close the outlet opening, it does not close the compensation opening, and when it is in the position to close the compensation opening, it does not close the outlet opening.
  • the device may be such that the closing means can be arranged in intermediate positions in which it part closes both the outlet opening and the compensation opening such that the total rate of flow of fluid through the outlet opening and the compensation opening is substantially the same as the rate of flow of fluid through either the outlet opening or the compensation opening when they are fully open.
  • the closing means is preferably mounted on the body so as to be slidable between the said positions and may be retained in position by frictional engagement with the body.
  • the closing means is mounted on a cylindrical part of the body for sliding in a circumferential direction.
  • the closing means is thus operable by a simple rotational movement about the body.
  • the closing means may have a substantially cylindrical inner surface for contact with the body and may define an outlet aperture corresponding to the outlet opening of the body and a compensation aperture corresponding to the compensation opening of the body.
  • the body is provided with a plurality of said outlet openings and a corresponding plurality of said compensation openings and said closing means.
  • the closing means are preferably operable independently from one another.
  • the device preferably includes movable means arranged to move all of the closing means into the position so as to close their respective outlet openings so that all of the outlet openings can be closed simultaneously.
  • the movable means may comprise a straight elongate member which is arranged to engage a projection on each closing member, thereby to operate the closing means so as to close their respective outlet openings.
  • each closing means is provided with a further projection which the straight elongate member is arranged to engage thereby to operate the closing means so as to open their respective outlet openings.
  • Locking means may be provided for locking the movable means in position.
  • the outlet openings can all be opened or closed simultaneously.
  • a device comprises a body which is elongate and defines the inlet opening at one end thereof.
  • the body is cylindrical.
  • the outlet openings are preferably aligned.
  • the device is preferably arranged to provide a substantially constant pressure of fluid at a notional line spaced from the body and substantially parallel thereto.
  • the device may be adapted to supply a gas, such as air, for use in the evaporation of a liquid, such as water.
  • a gas such as cooled air
  • a further problem which may occur with the known tube described is that of uneven air flow to a print cylinder through interference between air flows from adjacent rectangular slots. Tubes having circular apertures rather than rectangular slots are also known but may also suffer from this problem.
  • a fluid supply device comprising an elongate hollow body defining an inlet opening for the introduction of fluid under pressure and a plurality of aligned outlet openings spaced along its length, each outlet opening being elongate in the axial direction of the body and each end of each outlet opening which is adjacent the end of another outlet opening having rounded corners.
  • each outlet opening is in the form of a semi-circle.
  • openings of this shape which could be considered to be a combination of the two prior aperture shapes, provides a less turbulent airflow and the problems associated with the known aperture shapes are substantially reduced or eliminated.
  • the outlet openings are substantially identical and in the case where more than two outlet openings are provided, the outlet openings are preferably regularly spaced.
  • the thicknesses of the walls of the body in the positions at which the body defines the outlet openings are preferably substantially the same.
  • the body is a cylinder of uniform thickness.
  • a fluid supply system comprising pumping means for providing fluid under pressure, characterised in that the pump means is connected to a fluid supply device according to any aspect of the invention described previously.
  • the system may also include means for mounting the device in an appropriate position.
  • the system may further comprise means for cooling the fluid, which may be air, which is provided to the fluid supply device.
  • a fluid supply system for use in printing comprising a pump arranged to pump fluid to a fluid supply device for directing fluid onto a printing roller characterised in that the system includes temperature sensing means for sensing the temperature of the surface of a printing roller and cooling means arranged to cool the fluid to be supplied to the fluid supply device.
  • the cooling means is preferably controllable so that the temperature of the surface of the printing roller can be controlled to ensure that it does not increase to a level where printing quality deteriorates.
  • the cooling means may be manually controllable but preferably a control device is provided for controlling the degree of cooling performed by the cooling means dependent upon the temperature sensed by the temperature sensing means to keep the temperature of the cooled roller below a predetermined temperature and preferably in a predetermined temperature range.
  • the temperature sensing means may be of any suitable type and is preferably an infra-red thermometer.
  • Drying means is preferably also provided for removing moisture from the fluid supplied to the fluid supply device.
  • the drying means may be in any suitable form and may be a moisture trap.
  • the fluid supply device is preferably a fluid supply device according to any aspect of this invention described previously.
  • a method of supplying fluid to a printing roller comprising sensing the temperature of the surface of the printing roller, controlling fluid cooling means dependent upon the temperature sensed and passing fluid via the fluid cooling means to the printing roller.
  • the fluid is also passed to the printing roller via drying means arranged to remove moisture from the fluid.
  • a fluid supply device 10 comprises a cylindrical tubular body 11 including a plurality of aligned outlet openings 12 regularly spaced along the front thereof.
  • the outlet openings 12 are elongate in the axial direction of the body 11 and have rounded ends 13.
  • a plurality of circular compensation openings 18 are provided at the rear of the body 11 in positions corresponding to the positions of the outlet openings 12.
  • a plurality of throttling clips 14 are mounted on the body 11 and constitute the aforesaid closing means.
  • the throttling clips 14 are mounted in journal fashion on the body 11 having a cylindrical inner surface 15.
  • Each clip 14 includes a through slot 16 at the front thereof which extends over the width of the clips 14 and also includes a circular through bore 17 in the rear thereof.
  • Each clip 14 is rotatable on the body 11 such that its front slot 16 can be positioned opposite an outlet opening 12. In this position, its rear bore 17 is adjacent but not overlapping a compensation opening 18, as shown in Fig. 2. If the clip 14 is rotated so that its rear bore 17 is aligned with a compensation opening 18, its front slot 16 moves so that the previously exposed outlet opening 12 is covered by the clip 14.
  • each clip 14 is formed with an upper and a lower projection 19, 20.
  • the number of clips 14 provided on the body 11 can vary with the length of the body 11.
  • a mounting piece 21 for a rod 22 which consitutues the aforesaid movable means.
  • Each mounting piece 21 comprises an annular part 23 which surrounds the body 11 and an arm 24 extending from the annular part 23 and mounting the rod 22 in the region of its outer end.
  • the rod 22 and mounting pieces 21 serve to hold the throttling clips 14 in place on the body 11 and also enable the clips 14 to be moved simultaneously to take up the same position. Rotation of the rod 22 and mounting pieces 21 about the body 11 will cause the rod 22 to engage with one or other of the projections 19, 20 on each of the clips 14 so as to move them all to the same position.
  • the mounting pieces 21 each include a screw-threaded through bore 124 in their annular parts 23.
  • the mounting pieces 21 and the rod 22 can be locked in position on the body 11 by means of a locking screw 25 being screwed into one of the bores 124 into engagement with the body 11.
  • the body 11 includes a baffle plate 26 extending longitudinally inside it, as shown in Fig. 6, but this need not be provided.
  • An inlet opening (not shown) is provided at one end of the body 11 and the opposite end is sealed by a stop member 27.
  • the stop member 27 mounts a needle valve 28 therein which permits flow of fluid out of the body 11.
  • the stop member 27 also mounts a filter unit 29 which is dimensioned to extend over the internal cross-section of the body 11.
  • Figs. 7 and 8 show examples of the embodiment in use.
  • water is transferred from a trough 35 by a first roller 36. Excess water is prevented from moving with the first roller 36 by pressure of air from an air bar 37.
  • Water from the first roller 36 is transferred to further rollers and the device 10 is provided in position adjacent a roller 40 having both ink and water thereon so as to evaporate any excess water before it reaches the main printing roller 38.
  • the ink is provided from a bath 41 and again an air bar 42 prevents excess ink from moving with the roller 43 in the bath 41.
  • the needle valve 28 is initially set to minimise turbulence within the body 11.
  • the rod 22 is moved upwardly to engage the upper projections 19 of the clips 14 and hence move them to uncover the outlet openings 12 in the body 11.
  • the rod 22 may be secured by the locking screw 25 thereby locking the clips 14 in position. If the flow rate is found to be too high, then it may be throttled by means of the clips 14 if the rod 22 is lowered. Similarly, if it is desired to close certain of the outlet openings 12, the rod 22 can be removed from engagement and the appropriate clips i4 moved to shut off the outlet openings 12. By doing this, corresponding compensation openings 18 will be opened so that the flow rate through the remaining outlet openings 12 will not be increased.
  • Fig. 9 shows a fluid supply system including the embodiment.
  • a pump 30 draws air through a filter 31 and pumps it through a valve 32 to the inlet opening (not shown) of the body 11 which is mounted adjacent a roller in a system of printing rollers.
  • the output of the pump 30 is controlled by a valve 33 in a second outflow from the pump 30 which leads back to the filter 31.
  • Fig. 10 shows an arrangement similar to that of Fig. 8 but in which the main printing roller 38 is of the type used in the new silicon composition layer technique. Thus there is no system of rollers from a water bath and the device 10 is situated so as to direct air onto the main printing roller 38.
  • the silicon composition layer on the main printing roller 38 must be kept at a temperature of about between 25 and 27°C.
  • Air at room temperature can thus often be used but it is preferred in the embodiment to include an infra-red thermometer to determine the temperature of the surface of the main printing roller 38 and to have a refrigeration unit for cooling the air supplied to the device 10, the degree of cooling being controlled by a control unit dependent on the temperature sensed by the infra-red thermometer.
  • a moisture trap is included in the path of the air to the device 10.
  • the device 10 may be used without the clips 14, and the compensation openings 18 may be blocked or may not be provided, as desired.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

In a system for supplying fluid to a printing roller for lithographic printing, an infra-red thermometer is provided for sensing the temperature of the printing roller (38) surface. A control device is provided and controls a cooling unit for air pumped from a pump (30) dependent upon the temperature sensed by the thermometer. The cooled air is directed onto the printing cylinder (38) by a fluid supply device (10) which comprises a cylindrical tube (11) having aligned outlet openings (12) along its length. Each outlet opening (12) is elongate in the axial direction and has rounded corners. The tube (11) includes a filter unit (29) and a needle valve (28) at the end opposite the inlet and has a baffle plate (26) running axially therethrough. These features inhibit turbulence in the tube (11). There is a compensation opening (18) on the other side of the tube to each outlet opening (12) and each compensation opening (18) is the same size as its opposite outlet opening (12). Throttle clips (14) are provided on the tube (11) and allow the outlet openings (12) to be open when the compensation openings (18) are closed and the compensation openings (18) to be open when the outlet openings (12) are closed.

Description

  • The invention relates to a fluid supply device, a fluid supp!y system and a method of supplying fluid to a printing roller.
  • One situation in which it is known to use a fluid supply device is in lithographic printing where there can be a problem in getting the correct distribution of water and ink on a printing cylinder which leads to uneven and poor quality printing. It is known to combat this problem by using a tube having rectangular slots along its length. One end of the tube is sealed and air under pressure is supplied at the other end. The tube is positioned adjacent a printing cylinder and the air from the rectangular slots evaporates water on the cylinder. This device is rather crude, however, and can cause further problems such as piling, ink striping and zoning.
  • In a recently developed printing technique, a printing plate on a printing cylinder includes a deposited layer of a composition including silicon. Ink is rejected bv the layer and is picked up elsewhere on the cylinder. No water or other liquid other than the ink is used. In this technique however, if the layer becomes heated, as will tend to occur in use, then the layer will lose its ability to reject ink and will instead pick it up so that the whole printing plate picks up ink. There is thus a need for a device which will cool a printing cylinder in use, but will not affect e.g. the distribution of the ink picked up on the printing plate.
  • One problem which may occur using the known tube described is turbulence within the tube leading to an uneven flow of air through the slots in the tube.
  • According to one aspect of the invention, there is provided a fluid supply device comprising a hollow body defining an inlet opening for the introduction of fluid under pressure, and at least one outlet opening characterised in that inhibiting means is provided for inhibiting turbulence in fluid introduced into the body such that in use the rate of outwards fluid flow along the outlet opening or through the or any two of the outlet openings is substantially the same.
  • Thus, in the case where the device is used adjacent a printing cylinder arranged for lithographic printing, it will provide an even drying effect over the cylinder surface. Similarly, the even flow of air will not affect the ink distribution on the surface of a printing cylinder.
  • One reason for turbulence occurring within the known tube is the effect of air rebounding from the sealed end of the tube and mixing with subsequently introduced air travelling the opposite direction.
  • The inhibiting means may comprise valve means for releasing fluid from the body. Preferably, the valve means is provided at an opposite part of the body to the inlet opening. The valve means preferably comprises a needle valve.
  • The inhibiting means may comprise a baffle. The baffle may take any suitable form and may comprise swarf or the like suitably trapped in the body or may comprise a baffle plate. Preferably, however, the baffle comprises a filter unit.
  • It is known to provide clips on the existing tube described for closing or throttling the flow through the slots. However, if a clip is employed on a slot, the flow through the remaining slots is increased and the fluid pressure at the inlet may inconveniently have to be adjusted.
  • According to another aspect of the invention, there is provided a fluid supply device comprising a hollow body defining an inlet opening for the introduction of fluid under pressure into the body, an outlet opening and a compensation opening, the device also including closing means for closing the outlet opening and the compensation opening, the outlet opening and the compensation opening being such that, in use, when the outlet opening is closed by the closing means and the compensation opening is open, the rate of flow of fluid through the compensation opening is substantially the same as the rate of flow of fluid through the outlet opening when the outlet opening is open and the compensation opening is closed by the closing means.
  • Thus by means of the compensation opening, the rate of flow of fluid out of the body can be kept constant.
  • Preferably the compensation opening is provided at substantially the same distance from the inlet opening as the outlet opening.
  • Preferably the closing means is arranged such that when it is in the position to close the outlet opening, it does not close the compensation opening, and when it is in the position to close the compensation opening, it does not close the outlet opening. Thus, a constant rate of fluid flow through the body is assured. The device may be such that the closing means can be arranged in intermediate positions in which it part closes both the outlet opening and the compensation opening such that the total rate of flow of fluid through the outlet opening and the compensation opening is substantially the same as the rate of flow of fluid through either the outlet opening or the compensation opening when they are fully open.
  • The closing means is preferably mounted on the body so as to be slidable between the said positions and may be retained in position by frictional engagement with the body. Preferably the closing means is mounted on a cylindrical part of the body for sliding in a circumferential direction. The closing means is thus operable by a simple rotational movement about the body. The closing means may have a substantially cylindrical inner surface for contact with the body and may define an outlet aperture corresponding to the outlet opening of the body and a compensation aperture corresponding to the compensation opening of the body.
  • Preferably the body is provided with a plurality of said outlet openings and a corresponding plurality of said compensation openings and said closing means.
  • The closing means are preferably operable independently from one another. The device preferably includes movable means arranged to move all of the closing means into the position so as to close their respective outlet openings so that all of the outlet openings can be closed simultaneously. The movable means may comprise a straight elongate member which is arranged to engage a projection on each closing member, thereby to operate the closing means so as to close their respective outlet openings. Preferably, each closing means is provided with a further projection which the straight elongate member is arranged to engage thereby to operate the closing means so as to open their respective outlet openings. Locking means may be provided for locking the movable means in position. Thus, the outlet openings can all be opened or closed simultaneously.
  • Preferably, a device according to either of the above aspects of the invention comprises a body which is elongate and defines the inlet opening at one end thereof. Preferably, the body is cylindrical. The outlet openings are preferably aligned. The device is preferably arranged to provide a substantially constant pressure of fluid at a notional line spaced from the body and substantially parallel thereto. The device may be adapted to supply a gas, such as air, for use in the evaporation of a liquid, such as water. Thus, the device can be used in place of the known bar described. Alternatively the device may be adapted to supply a gas, such as cooled air, for use in coo!ing a cylinder.
  • A further problem which may occur with the known tube described is that of uneven air flow to a print cylinder through interference between air flows from adjacent rectangular slots. Tubes having circular apertures rather than rectangular slots are also known but may also suffer from this problem.
  • According to a further aspect of the invention there is provided a fluid supply device comprising an elongate hollow body defining an inlet opening for the introduction of fluid under pressure and a plurality of aligned outlet openings spaced along its length, each outlet opening being elongate in the axial direction of the body and each end of each outlet opening which is adjacent the end of another outlet opening having rounded corners.
  • Preferably the end of each outlet opening is in the form of a semi-circle.
  • Surprisingly, the use of openings of this shape, which could be considered to be a combination of the two prior aperture shapes, provides a less turbulent airflow and the problems associated with the known aperture shapes are substantially reduced or eliminated.
  • Preferably, the outlet openings are substantially identical and in the case where more than two outlet openings are provided, the outlet openings are preferably regularly spaced.
  • The thicknesses of the walls of the body in the positions at which the body defines the outlet openings are preferably substantially the same.
  • Preferably, the body is a cylinder of uniform thickness.
  • According to a yet further aspect of the invention, there is provided a fluid supply system comprising pumping means for providing fluid under pressure, characterised in that the pump means is connected to a fluid supply device according to any aspect of the invention described previously. The system may also include means for mounting the device in an appropriate position. The system may further comprise means for cooling the fluid, which may be air, which is provided to the fluid supply device.
  • It has been found that far superior results can be obtained in the system using a cylinder having a deposited layer including silicon if the printing roller can be cooled.
  • According to another aspect of the invention there is provided a fluid supply system for use in printing comprising a pump arranged to pump fluid to a fluid supply device for directing fluid onto a printing roller characterised in that the system includes temperature sensing means for sensing the temperature of the surface of a printing roller and cooling means arranged to cool the fluid to be supplied to the fluid supply device.
  • The cooling means is preferably controllable so that the temperature of the surface of the printing roller can be controlled to ensure that it does not increase to a level where printing quality deteriorates. The cooling means may be manually controllable but preferably a control device is provided for controlling the degree of cooling performed by the cooling means dependent upon the temperature sensed by the temperature sensing means to keep the temperature of the cooled roller below a predetermined temperature and preferably in a predetermined temperature range.
  • The temperature sensing means may be of any suitable type and is preferably an infra-red thermometer.
  • Drying means is preferably also provided for removing moisture from the fluid supplied to the fluid supply device. The drying means may be in any suitable form and may be a moisture trap.
  • The fluid supply device is preferably a fluid supply device according to any aspect of this invention described previously.
  • According to a further aspect of the invention there is provided a method of supplying fluid to a printing roller comprising sensing the temperature of the surface of the printing roller, controlling fluid cooling means dependent upon the temperature sensed and passing fluid via the fluid cooling means to the printing roller.
  • Preferably the fluid is also passed to the printing roller via drying means arranged to remove moisture from the fluid.
  • An embodiment of the invention will now be described by way of example and with reference to the accompanying drawings, in which:
    • Fig. 1 is an elevation of the embodiment;
    • Fig. 2 is an end view of the embodiment;
    • Fig. 3 is a plan view of the mounting means of the embodiment;
    • Fig. 4 is a side view of the mounting means of the embodiment;
    • Fig. 5 is a side view of the moving means of the embodiment;
    • Fig. 6 is an elevation in cross-section of the embodiment with the closing means removed;
    • Fig. 7 is an end view of the embodiment in use in a system of printing rollers;
    • Fig. 8 is an end view of the embodiment in use in a different system of printing rollers;
    • Fig. 9 is an end view of the embodiment as part of a fluid supply system; and,
    • Fig. 10 is an end view of the embodiment in use in a further system of printing rollers.
  • In the embodiment, a fluid supply device 10 comprises a cylindrical tubular body 11 including a plurality of aligned outlet openings 12 regularly spaced along the front thereof. The outlet openings 12 are elongate in the axial direction of the body 11 and have rounded ends 13. A plurality of circular compensation openings 18 are provided at the rear of the body 11 in positions corresponding to the positions of the outlet openings 12. A plurality of throttling clips 14 are mounted on the body 11 and constitute the aforesaid closing means. The throttling clips 14 are mounted in journal fashion on the body 11 having a cylindrical inner surface 15. Each clip 14 includes a through slot 16 at the front thereof which extends over the width of the clips 14 and also includes a circular through bore 17 in the rear thereof. Each clip 14 is rotatable on the body 11 such that its front slot 16 can be positioned opposite an outlet opening 12. In this position, its rear bore 17 is adjacent but not overlapping a compensation opening 18, as shown in Fig. 2. If the clip 14 is rotated so that its rear bore 17 is aligned with a compensation opening 18, its front slot 16 moves so that the previously exposed outlet opening 12 is covered by the clip 14.
  • The rear of each clip 14 is formed with an upper and a lower projection 19, 20. The number of clips 14 provided on the body 11 can vary with the length of the body 11. At each end of the row of clips 14 is provided a mounting piece 21 for a rod 22 which consitutues the aforesaid movable means. Each mounting piece 21 comprises an annular part 23 which surrounds the body 11 and an arm 24 extending from the annular part 23 and mounting the rod 22 in the region of its outer end. The rod 22 and mounting pieces 21 serve to hold the throttling clips 14 in place on the body 11 and also enable the clips 14 to be moved simultaneously to take up the same position. Rotation of the rod 22 and mounting pieces 21 about the body 11 will cause the rod 22 to engage with one or other of the projections 19, 20 on each of the clips 14 so as to move them all to the same position.
  • The mounting pieces 21 each include a screw-threaded through bore 124 in their annular parts 23. The mounting pieces 21 and the rod 22 can be locked in position on the body 11 by means of a locking screw 25 being screwed into one of the bores 124 into engagement with the body 11.
  • The body 11 includes a baffle plate 26 extending longitudinally inside it, as shown in Fig. 6, but this need not be provided. An inlet opening (not shown) is provided at one end of the body 11 and the opposite end is sealed by a stop member 27. The stop member 27 mounts a needle valve 28 therein which permits flow of fluid out of the body 11. The stop member 27 also mounts a filter unit 29 which is dimensioned to extend over the internal cross-section of the body 11.
  • Figs. 7 and 8 show examples of the embodiment in use. Using the same reference numerals for each drawing, in each case water is transferred from a trough 35 by a first roller 36. Excess water is prevented from moving with the first roller 36 by pressure of air from an air bar 37. Water from the first roller 36 is transferred to further rollers and the device 10 is provided in position adjacent a roller 40 having both ink and water thereon so as to evaporate any excess water before it reaches the main printing roller 38. The ink is provided from a bath 41 and again an air bar 42 prevents excess ink from moving with the roller 43 in the bath 41.
  • The needle valve 28 is initially set to minimise turbulence within the body 11. The rod 22 is moved upwardly to engage the upper projections 19 of the clips 14 and hence move them to uncover the outlet openings 12 in the body 11. The rod 22 may be secured by the locking screw 25 thereby locking the clips 14 in position. If the flow rate is found to be too high, then it may be throttled by means of the clips 14 if the rod 22 is lowered. Similarly, if it is desired to close certain of the outlet openings 12, the rod 22 can be removed from engagement and the appropriate clips i4 moved to shut off the outlet openings 12. By doing this, corresponding compensation openings 18 will be opened so that the flow rate through the remaining outlet openings 12 will not be increased.
  • Fig. 9 shows a fluid supply system including the embodiment. A pump 30 draws air through a filter 31 and pumps it through a valve 32 to the inlet opening (not shown) of the body 11 which is mounted adjacent a roller in a system of printing rollers. The output of the pump 30 is controlled by a valve 33 in a second outflow from the pump 30 which leads back to the filter 31.
  • Fig. 10 shows an arrangement similar to that of Fig. 8 but in which the main printing roller 38 is of the type used in the new silicon composition layer technique. Thus there is no system of rollers from a water bath and the device 10 is situated so as to direct air onto the main printing roller 38.
  • The silicon composition layer on the main printing roller 38 must be kept at a temperature of about between 25 and 27°C. Air at room temperature can thus often be used but it is preferred in the embodiment to include an infra-red thermometer to determine the temperature of the surface of the main printing roller 38 and to have a refrigeration unit for cooling the air supplied to the device 10, the degree of cooling being controlled by a control unit dependent on the temperature sensed by the infra-red thermometer. As the air should also be dry a moisture trap is included in the path of the air to the device 10.
  • The device 10 may be used without the clips 14, and the compensation openings 18 may be blocked or may not be provided, as desired.

Claims (23)

1. A fluid supply device comprising a hollow body (11) defining an inlet opening for the introduction of fluid under pressure, and at least one outlet opening (12) characterised in that inhibiting means (26,28,29) is provided for inhibiting turbulence in fluid introduced into the body (11) such that in use the rate of outwards fluid flow along the outlet opening (12) or through the or any two of the outlet opening (12) is substantially the same.
2. A fluid supply device as claimed in claim 1, characterised in that the inhibiting means (26,28,29) comprises valve means (28) for releasing fluid from the body (11).
3. A fluid supply device as claimed in claim 2, characterised in that the valve means (28) is provided at an opposite part of the body (11) to the inlet opening.
4. A fluid supply device as claimed in claim 2 or claim 3, characterised in that the valve means (28) comprises a needle valve.
5. A fluid supply device as claimed in any preceding claim, characterised in that the inhibiting means (26,28,29) comprises a baffle (26,29).
6. A fluid supply device as claimed in claim 5, characterised in that the baffle comprises a baffle plate (26).
7. A fluid supply device as claimed in claim 5, characterised in that the baffle comprises a filter unit (29).
8. A fluid supply device as claimed in any preceding claim, characterised in that the device is arranged to provide a substantially constant pressure of fluid at a notional line spaced from the body (11) and substantially parallel thereto.
9. A fluid supply device comprising a hollow body (11) defining an inlet opening for the introduction of fluid under pressure into the body (11), an outlet opening (12) and closing means (14) for closing the outlet opening (12) characterised in that the device also includes a compensation opening (18), and the closing means (14) is arranged to also close the compensation opening (18), the outlet opening (12) and the compensation opening (18) being such that, in use, when the outlet opening (12) is closed by the closing means (14) and the compensation opening (18) is open, the rate of flow of fluid through the compensation opening (18) is substantially the same as the rate of flow of fluid through the outlet opening (12) when the outlet opening (12) is open and the compensation opening (18) is closed by the closing means (14).
10. A fluid supply device comprising an elongate hollow body (11) defining an inlet opening for the introduction of fluid under pressure and a plurality of aligned outlet openings (12) spaced along its length, characterised in that each outlet opening (12) is elongate in the axial direction of the body (11) and each end of each outlet opening (12) which is adjacent the end of another outlet opening (12) has rounded corners (13).
11. A fluid supply device as claimed in claim 10, characterised in that the end (13) of each outlet opening (11) is in the form of a semi-circle.
12. A fluid supply device as claimed in claim 10 or claim 11, characterised in that the outlet openings (12) are substantially identical and in the case where more than two outlet openings (12) are provided, the outlet openings (12) are regularly spaced.
13. A fluid supply system comprising pump means (30) for providing fluid under pressure, characterised in that the pump means (30) is connected to a fluid supply device as claimed in any preceding claim.
14. A fluid supply system for use in printing comprising a pump (30) arranged to pump fluid to a fluid supply device (10) for directing fluid onto a printing roller (38) characterised in that the system includes temperature sensing means for sensing the temperature of the surface of a printing roller (38) and cooling means arranged to cool the fluid to be supplied to the fluid supply device.
15. A fluid supply device as claimed in claim 14, characterised in that the cooling means is controllable.
16. A fluid supply device as claimed in claim 14, characterised in that a control device is provided for controlling the degree of cooling performed by the cooling means dependent upon the temperature sensed by the temperature sensing means to keep the temperature of the cooled roller below a predetermined temperature.
17. A fluid supply device as claimed in claim 16, characterised in that the control device is arranged to keep the temperature of the cooled roller (38) in a predetermined temperature range.
18. A fluid supply device as claimed in any of claims 14 to 17, characterised in that the temperature sensing means is an infra-red thermometer.
19. A fluid supply device as claimed in any of claims 14 to 18, characterised in that drying means is provided for removing moisture from the fluid supplied to the fluid supply device.
20. A fluid supply device as claimed in claim 19, characterised in that the drying means is a moisture trap.
21. A fluid supply device as claimed in any of claims 14 to 20, characterised in that the fluid supply device is a fluid supply device (10) according to any of claims 1 to 12.
22. A method of supplying fluid to a printing roller comprising sensing the temperature of the surface of the printing roller (38), controlling fluid cooling means dependent upon the temperature sensed and passing fluid via the fluid cooling means to the printing roller.
23. A method as claimed in claim 22, characterised in that the fluid is also passed to the printing roller via drying means arranged to remove moisture from the fluid.
EP19900301605 1989-02-15 1990-02-15 A fluid supply device, a fluid supply system and a method of supplying fluid to a printing roller Withdrawn EP0383590A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB898903417A GB8903417D0 (en) 1989-02-15 1989-02-15 A fluid supply device
GB8903417 1989-02-15
GB8915520 1989-07-06
GB898915520A GB8915520D0 (en) 1989-02-15 1989-07-06 A fluid supply device

Publications (2)

Publication Number Publication Date
EP0383590A2 true EP0383590A2 (en) 1990-08-22
EP0383590A3 EP0383590A3 (en) 1990-11-14

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EP19900301605 Withdrawn EP0383590A3 (en) 1989-02-15 1990-02-15 A fluid supply device, a fluid supply system and a method of supplying fluid to a printing roller

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0733478A1 (en) * 1995-03-24 1996-09-25 MAN Roland Druckmaschinen AG Rotary cylindrical body with temperature regulation
US5750186A (en) * 1993-03-11 1998-05-12 Frazzitta; Joseph Method of coating a surface

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB726158A (en) * 1953-09-15 1955-03-16 George Joseph Ste Marie Drying means for printing machines
CH402302A (en) * 1961-05-05 1965-11-15 Siemens Elektrogeraete Gmbh Soundproofing device for vacuum cleaners and similar devices
GB1118212A (en) * 1965-04-12 1968-06-26 Bristol Fan Company Ltd Apparatus for drying webs of sheet material
US3686771A (en) * 1970-07-23 1972-08-29 Polygraph Leipzig Humidity regulating system for printing machines
AU2151583A (en) * 1983-11-18 1985-05-23 Milton Ray Lemaster Dehydration apparatus for printing press inking system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB726158A (en) * 1953-09-15 1955-03-16 George Joseph Ste Marie Drying means for printing machines
CH402302A (en) * 1961-05-05 1965-11-15 Siemens Elektrogeraete Gmbh Soundproofing device for vacuum cleaners and similar devices
GB1118212A (en) * 1965-04-12 1968-06-26 Bristol Fan Company Ltd Apparatus for drying webs of sheet material
US3686771A (en) * 1970-07-23 1972-08-29 Polygraph Leipzig Humidity regulating system for printing machines
AU2151583A (en) * 1983-11-18 1985-05-23 Milton Ray Lemaster Dehydration apparatus for printing press inking system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5750186A (en) * 1993-03-11 1998-05-12 Frazzitta; Joseph Method of coating a surface
US6036993A (en) * 1993-03-11 2000-03-14 Frazzitta; Joseph Method of coating a surface
EP0733478A1 (en) * 1995-03-24 1996-09-25 MAN Roland Druckmaschinen AG Rotary cylindrical body with temperature regulation

Also Published As

Publication number Publication date
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