DE2062030A1 - Liquid supply device - Google Patents

Description

Sh 1723

James Halley & Sons Ltd., West Bromwich, Stafford / England

Liquid supply device

The invention relates to feeding devices of liquid on a surface to form a coating thereon; it is used in particular for the supply of ink on the circumference of a cylinder in a rotary printing press.

The invention is based on the object of a constructive to create a simple liquid supply device, which works in such a way that a uniform and complete or perfect liquid supply deti the entire surface area is fed.

The invention is based on a liquid supply device with a channel from which, during operation, a liquid film in the direction of one to be covered with it Area flows over a horizontal overflow edge, which runs in the longitudinal direction of the channel, as well as with an inflow line for receiving a flow of liquid from a supply source.

In such a device, the invention consists in that there is a wall provided with holes, which runs in the longitudinal direction of the channel and defines a plurality of openings arranged at a distance in the longitudinal direction, which are in communication with the inflow line, so that a substantially uniform lateral Liquid flow through said wall results in a

109826/1143

Maintain uniform depth of liquid along the gutter.

The following are two exemplary embodiments of the invention described in more detail with reference to the drawing. Show it

Fig.l shows a cross section through a liquid supply device according to the invention, which at attached to a rotary printing press,

Fig. 2 is a partially sectioned front view of the liquid supply device shown in Fig. 1;

FIG. 3 shows a section along the line 3-3 of FIG. 2;

FIG. 4 is the same view as in FIG. 2, however of a modified embodiment;

Fig. 5 is a section along the line 5-5 in Fig.M.

The illustrated apparatus is used to supply a supply of ink to the impression cylinder 10 of a rotogravure press. According to FIGS. 1 to 3, a longitudinally extending slot 12 is provided in the wall of a cylindrical metal tube 11, the length of which corresponds approximately to the axial length of the cylinder 10. One end of the tube 11 is closed by a blind top fen 13, a coaxial extension of the plug forming a first support pin 14. At the other end of the tube 11, a plug 15 of the same external shape is attached, whereby a second support pin 16 results; Here, the plug and the pin define a coaxial bore which is open towards this end of the tube 11, whereby an inflow opening 17 is formed. An outer end portion of the pin l6 is shaped so that a connecting piece or nipple

109826/1143

for connecting a flexible pipe results.

A longitudinal partition 18 made of sheet metal extends within and along the Tube 11, and zvrar from the blind plug 13 parallel to the whole Length of the slot 12 to an end region of the tube in the vicinity of the inflow opening 17. The wall I ^ runs diametrically to the pipe 11 so that it rests against the pipe wall at points which are an equal angular distance have from the slot 12, As a result, the pipe is divided into a channel part 19, which extends through a longitudinal edge of the slot 12 extending segment of the pipe wall and by one side of the wall 18 is defined. Through the Division of the pipe also results in a feed pipe part 20 of semicircular cross-section, which extends in the longitudinal direction of the wall 13 and which passes through the wall is separated from the channel 19.

An end part 21 of the wall l3 is bent at right angles and shaped so that it is -between the inflow opening or duct 17 and the adjacent end of the slot 12 rests against the pipe wall, whereby this inflow line does not have a direct Has connection to the channel 19. The wall 18 is also arranged in the tube 11 that they are in a diametrical Slot engages in an inwardly directed protrusion 22 of the blind plug 13 is formed. Numerous openings 23, which are in the longitudinal direction at regular intervals are arranged from each other along the part of the wall lB, which defines the channel 19 are open to the pipe part or to the line 20.

An overflow plate 2k is arranged in that a hook-shaped holder 25 is placed on the lower edge of the slot 12 in such a way that the top of this plate slopes away from the slot or is inclined, for example at an angle of ^f about 24 to 30 ° to the horizontal ; a lower longitudinal edge of the

109826/1 U3

"Plate 24 is in close proximity to a perimeter of the cylinder 10.

Two holding elements 26 arranged at a horizontal distance from one another are provided on a frame of the press. Each of these elements consists of a pivotably arranged arm 27 which can be moved around a common axis by means of a screw jus tierunp · 28 in order to vary the distance between a hook-shaped end region of each arm 27 and said zone of the cylinder. This makes it possible to adjust the position of the feed device and the overflow plate 24 in order to adapt them to cylinders with different diameters. The tube 11 is arranged in the holding arms 27 in that the pins Ik and 16 are in engagement with said hook-shaped end regions, where they are held in place by means of screws 29. By releasing these screws, the tube 11 can be rotated relative to the brackets, which enables the angle of the overflow plate to be adjusted and the feed device to be precisely positioned; the angular position of the arms 27 is then adjusted. Normally, the device is arranged as illustrated in the drawings, with the wall 18 running in a vertical plane.

During operation, a flexible tube is attached to the spigot 16 of the assembled device, which is connected to a Ink supply is connected so that ink flows through the inflow line 17 and essentially the feed pipe 20 fills. From the pipeline 20 the liquid flows laterally through all openings 23 into the channel 19 below the level of the overflow edge. Its that way The resulting substantially uniform flow ensures that the trough is uniform over its entire length and is filled continuously or perfectly and that therein a liquid depth which is uniform in the longitudinal direction

109826 / 1U3

BATH ORIGINAL

is maintained. The ink flows over the horizontally lying upper edge of the overflow plate 2 ^ and flows down along its top as a continuous film of uniform thickness. The flow is maintained at the angle between the overflow plate and the adjacent zone of the cylinder 10, 10 so that as the cylinder rotates there is a uniform coating of ink, thereby covering its periphery.

In the modified embodiment illustrated in FIGS. H and 5, a blind plug 115 seals the end of the tube 11 which is opposite the plug 13; the associated pin 116 is made solid in the same way as the pin 14. In this case, the wall 18 does not have a bent end region, but extends from one end of the tube 11 to the other. An inflow pipe 130 extends radially from the pipe 11 on the opposite side of the slot 12 so that it opens into the pipeline 20, namely.on half the length of its length. Otherwise this construction is identical to that illustrated in FIGS. This construction can be used to provide a more convenient connection to the ink supply in some embodiments of printing presses. However, the inflow opening into the pipeline 20 can be located at either end or anywhere along the length of the pipeline; an even distribution of the ink from this pipeline into the channel is ensured by the wall 18 provided with openings. The invention ensures that some parts of the groove do not receive an excessive amount of ink while other parts do not receive anything or almost dry out. Experiments have shown that the even downward flow of ink along the overflow plate is so effective that satisfactory delivery to cylinders is achieved on presses operating at web speeds in excess of about 122 m / min without the ink being thrown away by centrifugal force becomes what is common with some others

1 0 9 8 2 6/1 U 3

-6- 206203Q

known feed devices or methods is the case. The supply or feeding is just as effective at Presses that run at lower speeds.

A conventional doctor blade (not illustrated) can be used provided to assist in removing excess ink from the cylinder; about one to accommodate such excess, a gutter '10 is located below the cylinder. The location of the gutter and scraper knife (if present) is adjustable to suit the diameter of the cylinder used and the operating conditions adapt.

109826/1143

Claims (10)

• " ⁷ ". 2062Q30 Claims ^ lOliquid supply device, with a channel, of which during operation a film of liquid in the direction of a surface to be coated with it a horizontal overflow edge flows into In the longitudinal direction to the channel, as well as with an inflow line for receiving a liquid stream from a supply source, characterized in that, that a perforated wall (IS) is present, which runs in the longitudinal direction of the channel and defines a plurality of longitudinally spaced apart openings (23) which communicate with the Einströmleitunr are in connection, so that a substantially uniform lateral liquid flow through said wall results in a uniform Maintain fluid depth along the gutter (19). 2.) Device according to claim 1, characterized in that the inflow line. (20) and the channel (19) are defined by a hollow element (11) which extends in the longitudinal direction is divided by the perforated wall (11). 3.) Device according to claim 2, characterized in that the hollow element (11) is a cylindrical tube having a longitudinal slot, through which the liquid film flows over the overflow edge during operation. 4.) Device according to claim 3, characterized in that the perforated wall (18) lies in a diametrical plane of the pipe. BATH ORIGINAL 109826 / 1U3 5.) Device according to one of the preceding claims, characterized in that the openings (23) below the operating level of the overflow edge are in communication with the channel (19). 6.) Device according to one of the preceding claims, characterized in that an overflow plate (2 * 1) is provided, which inclines in the operating state from the overflow edge in the direction of the surface to be covered is. 7.) Device according to claim 6, characterized in that the overflow edge is formed by the overflow plate (24) and that the overflow plate can be removed from the Channel (19) is arranged. 8.) Device according to one of the preceding claims, characterized characterized in that adjustable support means (26) are provided to support the gutter (19) and the connected overflow edge, the wall (18) and to move the inflow line (20) relative to the other part of the device. 9.) Device according to claim 8, characterized in that the holding devices (26) also have an angled Adjustment of the position of said equipment relative to the mounting devices by one in the longitudinal direction Allow running axis. 10.) Rotary printing press, characterized in that it has a feed device for liquid ink according to one of the preceding Includes claim operable to direct a stream of ink onto the circumferential surface of a cylinder is fed to the press. 109826/1 U3