JPH02215531A - Humidifier - Google Patents

Abstract

PURPOSE: To eliminate a flow of an undesired fluid through a fluid control position to be formed by a nip by obviating a flow of an excess flow fluid part from a circumference of both ends of the nip in an axial direction to a slip roller by collars provided at both axial ends of a pan roller, and transferring to return a liquid of a liquid pan by rotating the collars together with the pan roller. CONSTITUTION: An affinity between a brass collar 30 disposed at an end 15 of a pan roller 12 and a fluid is larger than that between a rubber outer surface of a slip roller 16 and the fluid. Since the affinity between the fluid and the collar 30 is thus large, the collar 30 tends to capture the excess fluid at an end of a nip 18 as the collar 30 rotates together with the roller 12. As the collar 30 continuously rotates together with the roller 12, the fluid captured by the collar 30 is separated from the roller 16, and returned to a fluid pan 14. Thus, the excess fluid at the end of the nip 18 is captured, and separated from the roller 16.

Description

[Detailed Description of the Invention] Shisenjokyou■ge±! The present invention relates to controlling the flow of fluid at a fluid control point, and more particularly to an apparatus for preventing the flow of unwanted fluid through a fluid control point defined by a nip formed by a pair of rollers. The device is particularly applicable to dampening devices of printing presses.

The dampening device of a printing press typically includes a plurality of rollers for transferring a dampening fluid to a printing plate during operation of the printing press, said printing plate being fixed to a plate cylinder of the printing press. ing. One of the plurality of rollers is a pan roller rotatable around a central longitudinal axis. The other roller is a slip roller, a first kneading roller, rotatable about its central axis and located adjacent to the bread roller. A nip is formed between the two rollers over their axial length. The nip has a fluid inlet side through which fluid enters the nip and a fluid outlet side through which fluid exits the leek 1.

During operation of the printing press, the pan roller rotates about its central axis in one direction, while the slip roller rotates about its central axis in the opposite direction. The pan roller is partially immersed in a source of dampening fluid, and the dampening fluid adheres to the outer surface of the pan roller as it rotates. The fluid is carried on the surface of the pan roller to the entrance side of the nip. The fluid thus enters the nip between the two rollers.

When the dampening fluid carried on the outer surface of the pan roller enters the nip between the two rollers, some of the fluid is transferred to the outer surface of the slip roller. Fluid that is not transferred to the outer surface of the slip roller remains attached to the outer surface of the pan roller. The fluid adhering to the outer surface of the slip roller is then transferred to the outer surface of the plate by another kneading roller. Fluid remaining on the outer surface of the pan roller is returned to the source of dampening fluid.

As is known in the art, it is necessary to control the amount of fluid transferred to the outer surface of the printing plate. One way to control the amount of fluid transferred to the printing plate is by controlling the rotational speed of the pan roller and the rotational speed of the slip roller. and control.

As the rotational speed of each of the rollers increases, the amount of fluid transferred to the printing plate increases. Similarly, as the speed of each roller decreases, the amount of fluid transferred to the printing plate also decreases.Another way to control the amount of fluid transferred to the printing plate is to reduce the amount of fluid transferred to the printing plate by moving one of the two rollers over the axial length of the two rollers. It is to shift the Yet another method is to increase or decrease the pressure between the two rollers in the nip.

The nip thus becomes a flow control point in the dampening device.

When the amount of fluid carried by the outer surface of the pan roller to the entrance side of the nip exceeds the amount of fluid exiting the nip at the exit side of the nip, excess fluid accumulates on the entrance side of the nip. Excess fluid accumulated on the inlet side of the nip tends to flow to both axial ends of the nip. Some of the excess fluid falls from the axial ends of the pan rollers into the fluid pan by gravity, while some of the excess fluid falls onto the slip rollers around the axial ends of the nip (i.e., flow control point). There is a possibility that it will flow to In this way, some of the fluid transferred onto the slip roller is then transferred to the printing plate.

This flow of fluid around the axial ends of the lip onto the slip rollers is uncontrollable and undesirable.

SUMMARY OF THE INVENTION In view of the above, the present invention provides a device for controlling fluid flow at a flow control point between two rollers.

The device according to the invention comprises means connected at one axial end of the roller for preventing the flow of undesired fluid through the flow control point. Suitable for use in machine and dampening equipment.

A device according to the invention includes a pan roller having a collar fixedly connected at each of its axial ends, the pan roller being partially immersed in a fluid pan filled with dampening fluid. The bread roller is disposed adjacent to the slip roller as the first kneading c-roller to form a nip between the bread roller and the slip roller. The nip has an inlet side and an outlet side and extends in the axial direction of the pan roller and slip roller. The slip roller is arranged adjacent to the vibrating roller as the second kneading roller, and the vibrating roller is arranged next to the third kneading roller.
The kneading roller is arranged adjacent to the νζ roller. The rollers are rotatable about their central longitudinal axes.

The pan roller is rotatable about its central longitudinal axis and carries fluid on its outer surface from the fluid pan to the inlet side of the nip, where the fluid at the nip is transferred onto the outer surface of the pickpocket roller or adheres to the outer surface of the pan roller. It remains as it is. Fluid on the outer surface of the pan roller is returned to the fluid pan.

The fluid transferred to the outer surface of the slip roller is transferred to the plate surface.

If there is excess fluid on the inlet side of the nip, the excess fluid will tend to flow to both axial ends of the nip. When excess fluid reaches the end of the nip, some of this fluid drips into the fluid pan due to gravity. flow from around both axial ends of the slip roller to the slip roller. The two collars rotate together with the pan roller about the central longitudinal axis of the pan roller. The two rollers thus capture excess fluid at both axial ends of the nip and remove the excess fluid from the slip rollers. This fluid is transferred back to the fluid pan by rotation of the collar with the pan roller. Preventing excess fluid at the entrance of the nip from flowing around the axial ends of the nip onto the slip rollers maintains precise control of the amount of fluid transferred to the printing plate.

Other features of the invention will become apparent to those skilled in the art to which the invention pertains after reading the following description, taken in conjunction with the accompanying drawings.

A dampening device constructed in accordance with the present invention for use in a printing press is shown in FIG. 1. The dampening device 10 includes a pan roller 12 partially immersed in a fluid pan 14 filled with a dampening solution. Typical dampening solutions are water, alcohol and gum arabic.

As shown in FIGS. 1-4, pan roller 12 is rotatable about its central longitudinal axis 25 and is cylindrical on its outer surface. The longitudinal central axis 25 of the pan roller 12 is located on a vertical line 19 (FIG. 3). The outer surface of the pan roller 12 is conventionally made of chrome material. bread roller 1
2 is located adjacent to a slip roller 16 as a first kneading roller. Slip roller 16 rotates about its central longitudinal axis 27 and has a cylindrical outer surface. Line 21 extends through central longitudinal axis 27 of slip roller 16 and central longitudinal axis 25 of pan roller 12 . The position of slip roller 16 relative to the position of pan roller 12 is such that lines 19 and 21 intersect and form an angle therebetween. The outer surface of slip roller 16 is conventionally made of rubber material.

A nip 18 is formed between the pan roller 12 and the slip roller 16 over the axial extent of the two rollers 12.16. This nip 18 is on the fluid inlet side 1
1 and a fluid outlet side 13. The inlet side 11 and outlet side 13 of the nip are located on opposite sides of the line 21. One side of a21 is higher than the other side of line 21. The inlet side of nip 18 is on the higher side of line 21. The exit side of the nip is on the lower side of line 21.

Slip roller 16 is located adjacent to vibrating or second kneading roller 20 . A vibrating roller 20 is located adjacent to a form roller or third kneading roller 22 . The vibrating roller 20 and the form roller 22 have cylindrical outer surfaces and are rotatable about their respective central longitudinal axes.

The form roller 22 is arranged adjacent to a plate surface 23 which is fixed to a printing plate cylinder 24 of a printing press.

During operation of the printing press, the pan roller 12 rotates in one direction about its central longitudinal axis 25 and the negative slip roller 16 rotates in the opposite direction about its central longitudinal axis 27. As shown in Figures 1, 2 and 3,
The pan roller 12 rotates in the direction of the hour hand, and the slip roller 1
6 is rotating counterclockwise. Thus, the pan roller 12 and the slip roller 16 are rotating in the same direction at the nip 18 between the pan roller 12 and the slip roller 16. Because pan roller 12 is partially immersed in fluid pan 14, the dampening fluid in fluid pan 14 adheres to the outer surface of pan roller 12 as pan roller 12 rotates about its central longitudinal axis 25. The fluid is
It adheres to the outer surface of the pan roller 12 because of its affinity with the chrome-plated outer surface of the pan roller 12.

3 and 4, fluid is conveyed from fluid pan 14 onto the outer surface of pan roller 12 to the inlet side 11 of nip 18 between pan roller 12 and slip roller 16. Referring to FIGS. Fluid on the inlet side of the nip 18 passes through the nip 118 and into the nip 18 as the two rollers 12.16 continue to rotate about their central longitudinal axes 25.27.
Move to the exit side. Because the inlet side 11 of the nip 18 is higher than the outlet side 13 of the nip 18, gravity facilitates fluid movement through the nip 18.

As the fluid moves through the nip 18 to the outlet side 13 of the nip 18, some of the fluid is transferred from the outer surface of the pan roller 12 to the outer surface of the slip roller 16. This movement occurs because the affinity between the fluid and the rubber exterior surface of slip roller 16 is greater than the affinity between the fluid and the chrome exterior surface of pan roller 12. Fluid that is not transferred to the outer surface of slip roller 16 remains attached to the outer surface of pan roller 12. Fluid remaining on the outer surface of pan roller 12 is returned to fluid pan 14.

1 and 4, as slip roller 16 continues to rotate about its central longitudinal axis 27, fluid carried on the outer surface of slip roller 16 is transferred to the outer surface of vibrating roller 20. It will be done.

Vibratory roller 20 transfers fluid from its outer surface to the outer surface of form roller 22; similarly, fluid carried on the outer surface of form roller 22 is transferred onto the outer surface of printing plate 23. In this way, the pan roller 12, slip roller 16, vibrating roller 20, and form roller 22 of the dampening device 10 cooperate to move fluid from the fluid pan 14 to the outer surface of the printing plate 23, which is fixed to the plate cylinder 24 of the printing press. Transport.

The amount of fluid transferred from fluid pan 14 to printing plate 23 can vary. One way to vary the amount of fluid transferred from fluid pan 14 to printing plate 23 is to vary the rotational speed of either pan roller 12 or slip roller 16.

A speed control mechanism 38, which is well known in the art for varying the rotational speed of either pan roller 12 or slip roller 16, is connected to the two rollers 1 as shown schematically in FIG.
2.16. The control mechanism 38 may be one of a number of conventional configurations.

Therefore, an increase in the speed of either of the two rollers 12, 16, the construction of which will not be described, increases the amount of fluid transferred to the printing plate 23. Reducing the speed of either of the two rollers 12,16 reduces the amount of fluid transferred to the printing plate 23.

Another method of controlling the amount of fluid transferred from the fluid pan 14 to the plate surface 23 is to control the amount of fluid transferred from the fluid pan 14 to the plate surface 23 by moving the pan roller 12 relative to the slip roller 16 over the axial extent of the two rollers 12,16.
It is to shift the When the two rollers 12,16 are offset, the contact pressure between them changes. 2 rollers 12
, 16, the amount of fluid transferred from the fluid pan 14 to the printing plate 23 decreases. Reducing the contact pressure to a certain point increases the amount of fluid transferred from fluid pan 14 to printing plate 23.

Also, the amount of fluid transferred from the fluid pan 14 to the printing plate 23 is determined by the amount of fluid transferred from the nip 1 between the pan roller 12 and the slip roller 16.
It can also be controlled by changing the size of 8. The contact pressure between two rollers 12.16 varies as a function of the size of the nip 18 between them. The amount of fluid transferred from pan roller 12 to slip roller 16 varies as a function of the contact pressure between the two rollers 12.16, as previously discussed. An adjustment mechanism 40, well known in the art, for adjusting the size of the contact area between pan roller 12 and slip roller 16 is operatively connected as shown schematically in FIG. The adjustment mechanism 40 may be one of many conventional devices, so details of its construction will not be described.

The fluid in the nip 18 is transferred to the outer surface of the slip roller 16 or remains attached to the outer surface of the pan roller 12. The amount of fluid exiting the leek 118 on the exit side 13 of the nip 18 is the sum of the amount of fluid on the outer surface of the pan roller 12 and the amount of fluid on the outer surface of the slip roller 16. If the amount of fluid transferred from the fluid pan 14 to the inlet side 11 of the nip 18 exceeds the amount of fluid exiting the nip 18 at the outlet side 13 of the nip 18, excess fluid will accumulate on the inlet side of the nip 18. .

If a situation occurs in which excess fluid accumulates,
The excess fluid accumulated on the outlet side 11 of the nip 8 tends to flow to both sides of the nip 18 in the axial direction. Most of the excess fluid flowing to the axial ends of the nip 18 ultimately flows from the axial ends of the pan roller 12 back to the fluid pan 14. A portion of the excess fluid at both axial ends of the nip 18 is removed from around said ends of the nip 18 by slip rollers 16.
It tends to flow upwards. This tendency occurs due to the greater affinity between the fluid and the rubber outer surface of the slip roller 16 than the affinity between the fluid and the chrome outer surface of the pan roller 12, and the flow characteristics of the fluid. It is.

The slip roller 1 is inserted from around both ends of the nip 18 in the axial direction.
The flow of excess fluid on the inlet side 11 of the nip 18 onto 6 is undesirable, the reason for such undesirability being that it is of an uncontrollable nature and
This is because it has an adverse effect on accurately controlling the amount of fluid transferred to No. 3. One way to prevent this undesirable flow is to trap excess fluid at the axial ends of nip 18 and remove it from slip roller 16.

As shown in FIGS. 2, 3 and 4, the collar 30
is the bread roller 1 at the end 15 of the bread roller 12.
It is fixed at 2. Made from color 30 brass material. The brass collar 30 is ring-shaped and has an outer diameter larger than the outer diameter of the pan roller 12. The brass collar 30 is made of two members. Each member is semicircular and forms one half of the brass collar 30. The two parts are held together by suitable fasteners. Brass collar 30 is secured to pan roller 12 when the fixture is tightened to hold the two members together. As shown in FIG. 2, a brass collar 35 is identical to the collar 30 and is fixed to the pan roller 12 at the other end 17 of the pan roller 12. As shown in FIG.

Two brass collars 30.35 located at the axial ends 15.17 of the pan roller 12 are used to trap excess fluid at the axial ends of the nip 18. Since the function of each of the brass collars 30, 35 is the same, only the brass collar 30 at one end 15 of the pan roller 12 will be described in detail. The affinity between the brass collar 30 located at the end 15 of the pan roller 12 and the fluid is greater than the affinity between the rubber outer surface of the slip roller 16 and the fluid;
This greater affinity between the fluid and the brass collar 30 allows the brass collar 30 to
as it rotates together, it attempts to capture excess fluid at the end of the nip 18. The brass collar 30 is the pan roller 12
As it continues to rotate with the collar 30, the fluid captured by the collar 30 moves away from the slip roller 16 and into the fluid pan 1.
Return to 4. In this manner, excess fluid at the end of nip 18 is trapped and removed from slip roller 16. By preventing excess fluid at the end 15 of the nip 18 from entering the slip roller 16 in this manner, the amount of fluid transferred to the printing plate 23 remains accurately controlled.

The preferred embodiment described above includes a pair of collars 30.35 located at opposite axial ends 15.17 of pan roller 12. However, two colors 30.3
5 at both ends of the slip roller 16 in the axial direction.Furthermore, it is also conceivable to use only one collar instead of two collars. Thus, if a single collar is used, the collar is located at one end of either pan roller 12 or slip roller 16.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a dampening device for a printing press constructed according to the invention; FIG. 2 shows the relationship between two rollers and a flow control point between them, as shown in FIG. Schematic perspective view of a part of the dampening device, 3rd. 2 is an enlarged partial schematic view of FIG. 2 illustrating the manner in which fluid is transferred from one roller to another; FIG. 3 is an enlarged side view of FIG. 2, taken generally along line 4--4 of FIG. 2, and showing the relationship between the two rollers and the flow control location between the rollers; FIG. In the figure, 10... dampening device 11... fluid inlet side 12
...Pan roller 13...Fluid outlet side 14...
・Fluid pan 15...One end of the roller 17...
Other end of roller 19... Vertical line 18... Nip 22... Form roller 24... Plate cylinder 30.35... Collar 38... Speed control mechanism 40... Size adjustment device 20.・・Vibration roller 23 ・Plate surface 25. 27 ・Center shaft (4 people outside)

Claims (1)

Claims: 1. a fluid source; a first roller rotatable about a central axis and having a cylindrical outer surface for receiving fluid from the fluid source; a second roller having an outer surface, the outer surface and the outer surface of the first roller being opposite to the first roller;
and a second roller defining a nip between the first roller and the second roller, and allowing fluid to transfer from the outer surface of the first roller to the outer surface of the second roller at the nip; The nip has a fluid inlet side where the first roller conveys fluid to the nip and a fluid outlet side where the first and second rollers convey fluid out of the nip, the first roller If the amount of fluid carried into the nip by the first and second rollers exceeds the amount of fluid carried out of the nip by the first and second rollers, a condition is created at the inlet side of the nip in which excess fluid remains. further arranged on one of the first and second rollers at least at one end of the nip to prevent excess fluid on the inlet side of the nip from flowing to the outlet side of the nip at the one end; A humidifier comprising means for returning excess fluid from the inlet side of the nip to the fluid source. 2. In an apparatus for returning excess fluid to a fluid source from a longitudinally extending nip formed between a first roller rotatable about a central axis and a second roller rotatable about a central axis. a collar disposed at one end of one of the first and second rollers to receive excess fluid from the nip and return excess fluid to a source of fluid; A humidifying device comprising a collar operative to prevent excess fluid in the nip from flowing around one end of the one roller as the device rotates about the central axis of the roller.