JPS6351099B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing oil supply method for effectively supplying lubricating oil to an eccentric bearing that pivotally supports a printing cylinder of a rotary printing press.

A rotary printing press has a plate cylinder equipped with a printing plate,
It is equipped with printing cylinders such as an impression cylinder that applies printing pressure during printing and a blanket cylinder that transfers images on the printing plate. Of these, the blanket cylinder or impression cylinder has an eccentric bearing that supports it, which rotates at the start and end of printing. By moving it, it is configured to attach and detach the printing pressure to and from the other body by performing so-called body insertion and body removal. The eccentric bearing has its outer circumference supported by a frame, and its inner circumference supporting the end shaft of the cylinder, and lubricating oil is constantly supplied to the inner and outer circumferential surfaces of the eccentric bearing. Many issues remained regarding supply.

In other words, since eccentric bearings do not rotate once and their rotation angle is around 30° to 50° at most, oil does not circulate around the entire circumference, which can cause galling at the mating parts due to insufficient lubrication and damage the bearing. There have been cases where the printer has become unable to rotate due to lack of oil supply and thermal expansion, resulting in the printer being unable to print at all. However, if the gap between the mating parts is made large, printing problems such as shot marks will occur, so it is necessary to make the gap as small as possible. Even if refueling was carried out by applying a certain amount of time, sufficient effects could not be expected.

The present invention has been made in view of the above-mentioned points, and is made by linking the oil supply operation of the oil supply pump to the cylinder removing operation of the eccentric bearing for attaching and removing the printing cylinder. A bearing lubrication method for a printing cylinder in a rotary printing press that reliably lubricates the entire circumference of the eccentric bearing without delay by forcibly lubrication using the gap between the It provides: below,
Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic side view of a dry offset intaglio rotary printing press for explaining the bearing oiling method according to the present invention, FIG. 2 is a sectional view of the impression cylinder shaft support, and FIG.
The figure is a side view showing the relationship between the impression cylinder and the intaglio cylinder during printing and during cylinder removal. In the figure, a printing machine 1 is equipped with a paper feeding device 2, a printing device 3, and a paper ejecting device 4. Paper 5 is loaded on the paper feeding device 2, and the printing machine 1 is automatically operated as the paper 5 decreases due to paper feeding. It is equipped with a paper stacking table 6 that rises upward. The printing device 3 includes
A swing 9 is provided that grips the paper 5 fed from the paper feeder 2 onto the difference plate 7 and transfers it to the claw of the paper transfer drum 8. On the downstream side of the paper transfer drum 8, there is a swing 9 shown by the arrow in the figure. An impression cylinder 10 (described in detail later) that rotates in the direction indicated by A is provided. This impression cylinder 10 has an arrow B in the figure.
A blanket cylinder 11 that rotates in the direction indicated by is in contact with the blanket cylinder 11, and four dry plate cylinders 12 each having a plate attached to its circumferential surface are in contact with each other. is equipped with a four-color inking device consisting of an ink fountain 13, etc., which supplies ink of a different color to the plates mounted on the peripheral surface of the printing plate. Then, the images formed on each plate with four colors of ink are transferred to the blanket cylinder 11, and further transferred to the blanket cylinder 11 and the impression cylinder 10.
The paper 5 is conveyed by being gripped by the claws of the impression cylinder 10 between the two, and is transferred to the paper 5 to perform dry offset printing.

Further, an intaglio cylinder 14 having an intaglio attached to its circumferential surface and rotating in the direction shown by an arrow C in the figure is in contact with the impression cylinder 10 .
An ink forming roller 16 of a three-color inking device consisting of a wiping roller 16 and a wiping roller 18 immersed in a cleaning liquid in a wiping tank 17 are in contact with each other.
Then, of the ink transferred to the entire surface of the intaglio plate by the ink forming roller 16, excess ink other than the concave portions is wiped off by the wiping roller 18, and the image formed by the ink remaining in the concave portions is transferred between the impression cylinder 10 and the intaglio cylinder 14. It is configured such that intaglio printing is performed by transferring the image onto the paper 5 which is conveyed while being gripped by the claws of the impression cylinder 10.

Further, the impression cylinder 10 is in contact with a paper take-up cylinder (not shown) which is coaxial with one sprocket 20 on which a paper ejection chain 19 is stretched, and the printed paper 5 is transferred to this paper take-up cylinder. Paper ejection chain 19
It is configured so that it can be carried by being held in the jaws of the person. A pair of front and rear paper stacking tables 20 are arranged below the conveyance end of the paper ejection chain 19, and the paper stacks 20 are arranged so that the paper 5 that is released from the claws of the paper ejection chain 19 and falls.
is loaded, and the paper ejection path is switched to the other paper stacking table 20 each time it becomes full.

The configurations of the impression cylinder 10 and the intaglio cylinder 14 of the printing press 1, which are generally configured as described above, will be explained in further detail, and a method for supplying oil to the bearings of the impression cylinder 10 will be explained. That is, the impression cylinder 10 is
It is a so-called quadruple cylinder that prints on four sheets of paper 5 during rotation, and as shown in FIG.
a and an ineffective surface 10b, and an effective surface 10
When the starting end in the rotational direction of the paper transfer cylinder 8 comes into contact with the paper transfer cylinder 8, the paper 5 is re-held in the mouth and the paper 5 is wound around the effective surface 10a. In addition, intaglio cylinder 1
4 also has four effective surfaces 14a and non-effective surfaces 14b which are arranged alternately by dividing the entire circumference into approximately eight equal parts, and an image is formed on the effective surface 14a, and an effective surface 10a opposite thereto. This image is transferred to the upper paper 5 and printed.

The bearing structure of the impression cylinder 10 will be explained based on FIG. 2. An outer bearing 22 is fitted to the left and right frames 21, and an eccentric bearing 24 is rotatably attached to the outer bearing 22 via a bush 23. It is pivoted on.
In the eccentric bearing 24, the axis F of the tapered outer circumferential surface 24a that fits with the bush 23 and the axis _F1 of the inner circumferential surface 24b on which the rolling bearing 25 is fitted are eccentric as shown by the symbol t in the figure. The impression cylinder 10 has an end shaft 26 supported by a rolling bearing 25 and a nut 2
7 restricts movement in the axial direction. A pivot shaft 29 is attached to the eccentric bearing 24 and the lid body 28 integrated therewith.
One end of the rod 30 is pivotally connected to the rod 30, and the other end of the rod 30 is connected to an air cylinder (not shown). By expanding and contracting this air cylinder, the eccentric bearing 24 rotates, and the impression cylinder 10 is attached to and removed from the intaglio surface of the intaglio cylinder 14, thereby performing so-called insertion and removal.
Figures 3a and 3b show the state in which the cylinders are inserted and printing is in progress, and figure a shows the effective surfaces 10a and 10a of both cylinders 10 and 14, respectively.
14a are facing each other and printing is being performed, and FIG. b shows the non-effective surfaces 10b, 14b,
In other words, both cylinders 10 and 14 are shown facing each other between the printed paper and the paper to be printed. Furthermore, FIG.
This shows a state in which a and 14a are separated while facing each other.

The eccentric bearing 24 that pivotally supports the impression cylinder 10 configured in this manner is provided with a lubricating oil supply device for smooth rotation for inserting and removing the cylinder. That is, between the outer circumferential surface 24a of the eccentric bearing 24 and the inner circumferential surface of the bush 23, there is a minute gap 3 for oil supply sealed by a pair of O-rings 31, 32.
3 is formed, and this minute gap 33 is shown enlarged in FIG. 3 for ease of understanding. This gap 33 is connected to an oil supply pump (not shown) through an oil supply passage 34 provided in the eccentric bearing 24 and an oil supply pipe (not shown) connected to the oil supply passage 34 on the side of the eccentric bearing 24. The gap 33 is configured to be supplied with oil by the operation of the oil supply pump. Furthermore, the electric circuit of the switch that connects and disconnects the operation of the oil supply pump and the electric circuit of the switch that connects and disconnects the operation of the air cylinder for attaching and detaching the impression cylinder 10 to the shell removal side are connected via a timer. The refueling pump is configured to operate in response to a signal issued before the cylinder operates in the direction of removing the shell, and is configured to stop the pump in response to a signal issued after the air cylinder has finished operating in the direction of removing the shell. That is, the gap 33 is configured to be supplied with oil a little before the removal of the shell, continued until a little after the removal of the shell is finished, and then stopped.

In the printing press configured as described above, the paper 5 supplied from the oil supply device 2 onto the differential plate 7 is transferred to the impression cylinder 10 by changing the grip between the swing 9 and the claws of the paper transfer cylinder 8 and the impression cylinder 10. The paper is wrapped around the circumferential surface of the blanket cylinder 10 and is conveyed, and as it passes between the impression cylinder 10 and the blanket cylinder 11, four-color dry offset printing is applied. Also, when passing between the impression cylinder 10 and the intaglio cylinder 14, 3
The paper 5 with color intaglio printing and both types of printing is conveyed from the claw of the impression cylinder 10 to the claw of the paper discharge chain 19, and then placed on one of the paper stacking tables 20. They are loaded alternately until they are full. When the machine stops due to completion of printing or paper feeding failure, an air cylinder connected to the eccentric bearing 24 is operated in conjunction with the stopping operation, and the impression cylinder 10 is moved to the intaglio plate. The body is removed from the body 14. In this case, a signal is generated slightly earlier than the start of shell removal, the hydraulic pump is activated, and the eccentric bearing 2
4 and the bushing 23, this oiling continues during the shell removal operation, and a signal issued slightly after the shell removal operation ends causes the hydraulic pump to stop and oil supply to stop. be done.

The relationship between this refueling timing and the gap 33 is
To explain based on the figures, Figure a shows the cylinder inserted state, and since the effective surfaces 10a and 14a of both cylinders 10 and 14 are in contact with each other and a large printing pressure is applied, the impression cylinder 10
The side eccentric bearing 24 is pressed by printing pressure and is eccentrically located above the frame side bush 23, and a gap 33 is formed on the lower intaglio cylinder 14 side. In addition, figure b is also in the state where the body is inserted, and the non-effective surface 1
0b and 14b are facing each other and no printing pressure is applied, but since the weight of the impression cylinder 10 is supported by the intaglio cylinder 14, the eccentric bearing 24 is located almost at the center of the bush 23, and the gap 33 is on the side. It is formed. Further, in FIG. c, since both cylinders 10 and 14 are removed and separated, the eccentric bearing 24 is eccentrically located below the bush 23 due to the weight of the impression cylinder 10, and a gap 33 is formed above. has been done. In this manner, the position of the gap 33 changes over almost the entire circumference of the eccentric bearing 24 during the period from FIG. 1A to FIG. On the other hand, in the oil supply method according to the present invention, the oil supply is continued from a little before the start of carcass removal to a little after the carcass removal is completed. can be done. Since the shell removal operation is generally performed several to several dozen times a day, refueling is always performed each time, and there is no possibility of insufficient refueling or uneven refueling in one direction.

The present invention can be applied to the printing cylinder of any rotary printing press, but it is particularly suitable for cases where the printing pressure is large and the weight is heavy, such as the impression cylinder of the quadruple cylinder intaglio printing press shown in the example. The effect is particularly remarkable. Also, it is ideal to start refueling at a certain timing before removing the cylinder and finish it at a certain timing after removing the cylinder, but in a special-purpose machine such as a securities printing machine, the operating speed is constant, so it is difficult to A timer can be used to delay the lubrication pump for a certain period of time from a safety device used to issue a pull-out command, or if the printing pressure is large, such as in an intaglio printing machine, lubrication can be performed directly using a signal from a safety device, and even more constant. The same effect can be obtained by ending refueling after a certain period of time.

As is clear from the above description, according to the present invention, in the bearing lubrication method for a printing cylinder in a rotary printing press, the lubrication operation of the oil supply pump is linked to the cylinder removal operation of the eccentric bearing for attaching and removing the printing cylinder, and By forcibly lubricating the eccentric bearing by taking advantage of the fact that the gap between the outer peripheral surface of the eccentric bearing and its shaft support hole is opposite to each other, the eccentric bearing is always lubricated every time the eccentric bearing is removed. Since oil is distributed evenly around the entire circumference of the bearing, there is no galling or thermal expansion of the fitting parts due to insufficient lubrication, which prevents damage to the bearing and the risk of the bearing becoming unable to rotate. There is no. Furthermore, since there is no need to increase the gap between the fitting parts in consideration of insufficient oil supply, printing defects such as scratches do not occur, and the quality of printed matter can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a dry offset intaglio rotary printing press for explaining a method of lubricating a printing cylinder in a rotary printing press according to the present invention, FIG. 2 is a cross-sectional view of the impression cylinder shaft support, and FIG. FIG. 2 is a side view showing the relationship between the impression cylinder and the intaglio cylinder during cylinder loading printing and cylinder removal. 1...Printing machine, 10...Impression cylinder, 14...Intaglio cylinder, 23
...Button, 24...Eccentric bearing, 33...Gap.

Claims (1)

[Claims] 1 Start the oil pump to supply oil to the eccentric bearing with a signal before the eccentric bearing for attaching and removing the printing cylinder begins to rotate in the direction of removing the cylinder, and refuel with the signal after the eccentric bearing has finished rotating in the direction of removing the cylinder. A method for lubricating a bearing of a printing cylinder in a rotary printing press, characterized by stopping the pump to finish lubricating the eccentric bearing.