JPS6248583B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for maintaining a constant axial spacing between the two printing press cylinders, each of which is arranged in front of at least the operating end face of each printing press cylinder and together with the printing press cylinders. The present invention relates to a rotary printing press equipped with rotating cylinder pillows, which are constantly brought into contact with each other in a state where they are coated with a prolade and are caused to roll against each other.

This type of rotary printing press is widely known in the field of printing technology (Druckmaschinen-
Nachrichten 1976, No. 63, pp. 3-24). The body pillow that forms the pair of such rotary printing presses is
Guarantees precise, shock-free rolling of the individual plate cylinders, blanket cylinders and impression cylinders to prevent print smudges, i.e. blurring at the edges of characters and printed images caused by insufficient contact between the press cylinders used to.
In particular, the paired cylinder pillows serve to prevent flexural and torsional vibrations of the printing press cylinder, which can lead to the formation of stripes and doubling in the printed image. For this purpose, the body pillows are crimped together under considerable pressure in order to prevent separation and slippage between the body pillows during printing.

The cylinder pillow is usually arranged directly on the end face of the printing press cylinder, that is to say between the printing press cylinder and the bearing for the shaft of this printing press cylinder, so that it is This provides the advantage that the elastic modulus of the vibration system formed by the vibration system becomes small, and the critical natural frequencies of deflection and torsion of the vibration system become large. In this case, however, rubber blanket bulges are formed due to incorrect machine adjustment or a buildup of ink scum and paper lint tends to push the press cylinders apart from each other. Another drawback is that the compression force between the pair of body pillows is reduced. As a result, torsional vibrations that affect the printed image are likely to occur, and furthermore, the cylinder pillows separated from each other will violently collide with each other again when the cylinder grooves of the plate cylinder and the blanket cylinder coincide with each other. The impact loads caused by such collisions inevitably result in extremely costly torso pillow damage.

Therefore, it is an object of the present invention to improve a rotary printing press of the type mentioned at the outset, so as to be able to easily and reliably avoid shock loads on the body pillow of this rotary printing press and uneven printing in printed images. To prevent separation between trunk pillows during driving without requiring additional costs.

In order to solve this problem, in the configuration of the present invention,
A cylinder pillow arranged in front of the operating end face of each printing press cylinder is fixed to the shaft of the printing press cylinder outside the side wall of the rotary printing press.

In the rotary printing press according to the invention, when the two printing press cylinders are separated from each other, the cylinder pillow arranged in front of the end face on the operating side of each printing press cylinder has its pressing force reduced as in the prior art. Instead of being pushed together, they are pushed together even more forcefully. Therefore, not only separation between the trunk pillows but also relative slippage does not occur at all. Furthermore, the preload between the torso pillows can be significantly reduced, so that there is little risk of damaging the torso pillows.

In an advantageous embodiment of the invention, the cylinder pillows on both sides of the printing press cylinder are fastened to the shaft of the printing press cylinder on the outside of both side walls of the rotary printing press. This makes it possible to easily access the cylinder pillows on both sides of the printing press cylinder from the outside without removing the printing press cylinder, making it possible to replace the cylinder pillows.

In this case, it is advantageous if the axis of the printing press cylinder is extended on the drive side of the printing press cylinder, and the cylinder pillow on the drive side of the rotary printing press is fixed to the axis of the printing press cylinder outside the drive gear of the printing press cylinder. ing.

Next, embodiments of the present invention will be specifically described using the drawings.

The drawing shows two printing press cylinders 1 and 3, whose shafts 5 and 7 are located in the side wall 9 on the side that drives the rotary printing press (drive side) and on the side that operates the rotary press (operating side). is supported in the side wall 11 of.
Drive gears 13, 1 are connected to the shafts 5 and 7 on the outside of the side wall 9.
5, 17, and 19 are attached. The drive gears mesh with other barrel gears or gears 21, and are driven via this gear.

The shafts 5 and 7 have, on the outside of the side wall 11, a cylinder pair 23 consisting of two generally disk-shaped cylinders 25 and 27, each cylinder rotating together with the printing press cylinder 1 or 3. and roll into each other. By suitably adjusting the position of the bearings in the side walls 9 and 11 for the shafts 5 and 7, a preload is applied between the body pillows 25 and 27, which preloads the body pillow 25.
Separation or relative slip between and 27, as well as flexural vibration and torsional vibration, are prevented from occurring.

In contrast to known trunk pairs in which the trunk pillows are arranged between the side walls, the illustrated arrangement of the trunk pillow pairs according to the invention allows for the rubber blanket bumps or long-term In the event of separation between the printing press cylinders 1 and 3 due to ink scum and paper fibers deposited during operation, the cylinder pillows 25 and 27 will be pressed together more strongly, thus preventing separation between the cylinder cylinders 25 and 27 and There is no subsequent shock. If the preload of the cylinder cylinders 25 and 27 is chosen correctly, the cylinder cylinders can cause relative sliding and torsional vibrations between the cylinders 1 and 3 even if the cylinder grooves of the cylinders 1 and 3 coincide with each other. There is no decrease in the pressure bonding force between 25 and 27.

In order to also prevent flexural vibrations of the printing press cylinders 1 and 3, in addition to the cylinder pillow pair 23, a
Another body pillow pair 29 consisting of two body pillows 31 and 33 is arranged outside of the body pillows 7 and 19. Body pillow 31
and 33 also roll against each other under preload. In this type of arrangement, both pairs of cylinder cylinders 23 and 29 are easily accessible from the outside, so that cylinder cylinders 25, 27, 31 and 33 can be easily replaced, and for this purpose printing press cylinders 1 and 29 are easily accessible. There is no need to remove 3.

In the arrangement shown in FIG.
, the required space is expanded and the drive gears 13,1
5, 17, and 19 are difficult to cover in an oil-tight manner and impede access to the drive gear. Therefore, in the arrangement shown in FIG. 2, the second pair of trunk pillows 35 consisting of the trunk pillows 37 and 39 is provided inside the side wall 9.

There are no disadvantages caused by such an arrangement. Because the body pillows 25, 27 and 37,
This is because the pair of body pillows 23 sufficiently prevents separation between the body pillows 39.

In order to replace the cylinder pillows 37 and 39 without removing the printing press cylinders 1 and 3, the cylinder pillows 37 and 3 are
9 can be divided into two halves by two diagonally extending separating surfaces 41 and 43, which halves are adapted to be attached to the axes 5 and 7 even in the assembled state.

In the embodiment shown in FIG. 3, only one pair of cylinder pillows 23 is provided on one side of the printing press cylinders 1 and 3.
In this case, in order to prevent torsional vibration of the shafts 5 and 7 within the tooth play, the drive gears 13, 15, 1
7, 19 must be constructed to prevent twisting of the shafts 5 and 7. This can be achieved, for example, by tooth segments or auxiliary gears 17, 19 with play adjustable in a known manner.
The tooth segments or auxiliary gears may also be constructed elastically in a known manner.

Since the pair of body pillows 23 is disposed outside the side wall 11 and is therefore easily cooled, at least one of the disc-shaped body pillows 25 and 27 is constructed as a brake disc of a disc brake, and thereby It is also possible to provide a disc brake function. For this purpose, for example, a brake saddle 45 with two brake jaws (not shown in detail) acts on the edge of the trunk pillow 27. Compared to conventional rotary printing presses, which have brakes mounted on the main drive shaft due to space requirements and cooling considerations, such rotary printing presses do not require the brakes to be attached directly to the part to be braked via a drive device. This has the significant advantage that a braking action can be produced without any braking action.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a front view of a rotary printing press according to the first embodiment, and FIG.
The figure is a front view of a rotary printing press according to a second embodiment, and FIG. 3 is a front view of a rotary printing press according to a third embodiment. 1 and 3...Printing machine cylinder, 5 and 7...Shaft, 9 and 1
DESCRIPTION OF SYMBOLS 1... Side wall, 13, 15, 17 and 19... Drive gear, 21... Gear, 23... Trunk pillow pair, 25 and 27...
Torso pillow, 29... Torso pillow pair, 31 and 33... Torso pillow, 35
... Pair of body pillows, 37 and 39... Body pillows, 41 and 43...
Separation surface, 45...brake saddle.

Claims (1)

[Claims] 1. A cylinder pillow that is arranged in front of at least the operating side end face of each printing press cylinder and rotates together with the printing press cylinder, in order to maintain a constant shaft spacing between the two printing press cylinders. In a rotary printing press with
The cylinder pillows 25, 27 arranged in front of the operating end of each printing press cylinder 1, 3 are fixed to the shafts 5, 7 of the printing press cylinders 1, 3 on the outside of the side wall 11 of the rotary printing press. A rotary printing press featuring 2 Cylindrical pillows arranged in front of both end faces of each printing press cylinder 1, 3 are fixed to the shafts 5, 7 of the printing press cylinders 1, 3 on the outside of both side walls 9, 11 of the rotary printing press. A rotary printing press according to claim 1. 3 A cylinder pillow arranged in front of the drive side end face of each printing press cylinder 1, 3 is connected to the driving gear 13, 1 of the printing press cylinder 1, 3.
5, 17, 19 on the outside of the shaft 5 of the printing press cylinder 1, 3;
7. The rotary printing press according to claim 2, wherein the rotary printing press is fixed to the rotary printing press 7. 4. A cylinder pillow arranged in front of the drive side end face of each printing press cylinder 1, 3 is fixed to the shafts 5, 7 of the printing press cylinders 1, 3 inside the side wall 9 of the rotary printing press. A rotary printing machine according to scope 1.