JPS6147263A - Contacting fouling preventive type paper winding-feed cylinder in sheet rotary press - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a contact press in a sheet-fed rotary printing press in which mechanically machined blow-off holes are distributed over the entire cylindrical surface on which sheets of paper are placed on the barrel wall. This invention relates to a stain-proof paper winding feed cylinder.

[Prior art]

A device that transports printed sheets in a printing press from one printing unit to the next printing unit, or from the last printing unit to a delivery device, while the sheets are being transferred. There is a known device in which the sheet of paper is supported by the air blown out from the machine parts that are exposed to the process, thereby preventing contact staining of the paper surface with undried ink, or in extreme cases, wiping off the ink. It is.

Such a device is described in DB-PS 1561043, and according to this device, sheets are pushed in the cylinder of the delivery device of a sheet-fed printing machine by an air flow coming out of holes arranged on the outer surface of the cylinder. The shell is combined with a cover made of a porous, breathable material of known type so that the air exiting the holes is evenly distributed. In order to regulate the air outflow from the individual holes, a structurally complex and expensive air conditioning device must be installed in the cylinder of the delivery device, which in particular prevents contact fouling of the sheets immediately after printing. It would be a big problem to accurately adjust the air locally or temporally in areas where this is likely to occur. Apart from that,
The amount of blow-off air required is always high, so that the blow-off air supply device has to be unnecessarily large. Additionally, if the porous covering on the barrel becomes even slightly damaged or soiled, costly and time-consuming replacement work is required.

[Purpose, structure, and effect of the invention]

In order to eliminate these drawbacks of the prior art, it is an object of the present invention to provide a uniform, low air volume over the entire outer surface of the shell without the need for time-consuming adjustment operations or extensive adjustment devices. To provide an easy-to-handle paper winding feed cylinder in which contact staining of sheets immediately after printing can be reliably avoided by forming an air cushion with as little turbulence and impact as possible.

According to the invention, the above object is achieved by installing an air distribution member in the outlet hole of the fuselage wall, which regulates the flow of air blown out from it in such a way that it forms a uniform air cushion. , this air distribution member is supported in such a way that it can be retracted in the radial direction of the cylinder, and when the tension of the printed sheet exceeds a certain limit, i.e. when the force pushing it exceeds a certain limit, The solution is that it is formed into a spherical or spherical paper support that can be automatically retracted and rotated in any direction.

By arranging a large number of individually separate air distribution elements on the entire outer surface of the cylinder, a particularly reliable, quiet and also touch-contamination-free sheet transport is possible. By appropriate selection of the material and shape of the individual air distribution elements (paper supports), the pattern of flow conditions required to form a complete, turbulent, and shock-free air cushion can be very easily determined by empirical methods. Therefore, it is possible to quickly respond to changes in the conditions in the printing process, such as changes in the thickness of the paper being handled, so it is especially important to maintain stable sheet conveyance conditions. I can do it.

Furthermore, since the individual air distribution elements can be easily replaced, for example if they become dirty, the ease of handling and thus the reliability of operation of the paper web feed cylinder is ensured to the highest degree.

Even if an undesired relative movement between the sheet and the paper roll feed cylinder occurs, for example due to the resistance of the sheet from being fed out of the rubber cloth of the blanket cylinder, the sheet will move on the paper support. Since it can roll on the body in any direction and move by contact, contact contamination is largely avoided. In this case, it is advantageous that only the paper support supporting contact-smear-prone areas of the sheet is rotated in one direction, so that the sheet immediately after printing is rotated in one direction. Even in the undesirable case of ink transfer, the sheet will always be supported by the uninked surface area created by its rotation on the paper support.

In one advantageous embodiment of the invention, the paper support receiving hole is combined with the paper support so that the paper tension exerted on the paper support is
Furthermore, it is in the form of an air blowing valve that receives air supply from a single blowing air source device, and automatically controls it according to the force with which it is pushed.

Depending on the pressing force applied, in other words the tension of the sheet, the paper support, especially those in the pattern areas where contact staining is likely to occur, is reduced to half speed from the beginning of the relative movement there.
The paper support receiving holes, which move radially inwardly in the barrel against the force of the springs and thus serve as air passages, are adjusted in places as much as necessary for the formation of a sufficient vital air cushion. It opens to fit the air, allowing the air to flow out automatically. The outflowing air forms an air cushion, whereby the sheet is lifted and supported to the extent that the pressing force exerted on the paper support, in other words the paper tension, is reduced, so that the paper The support is pushed back radially outwards again, and the valve opens less or closes completely. By automatically regulating the blown air according to the required amount in this way, the amount of blown air can be extremely small, and the blown air source device can be made relatively small. This air blowing valve uses a spherical or spherical paper support as an actuating body.
In contrast to the known ordinary valves used for this purpose, the special effect it has is that the outflow of air occurs uniformly and dispersively in all directions without impacting in any particular direction; Therefore, the aim is to form an air cushion that fully supports the sheet.

In one developed embodiment of the invention, the leakage air flowing out of the closed air outlet valve is utilized to create a constant air cushion. In this case, it is advantageous to provide rough or even different tolerances in the manufacture of the plug-in sleeve and/or the paper support, in order to ensure that the blown air escapes.

Using a slight annular gap in the closed air outlet valve, determined by manufacturing tolerances or geometry, a constant and undisturbed air cushion is distributed evenly over the entire outer surface of the shell. can be maintained without any undesirable side effects with a required air volume of up to J., which contributes to a particularly quiet sheet transport.

Further advantageous embodiments of the invention are disclosed in claim 2.
Section 3, Section 3, and Sections 7 to 10, and will be referred to in the following description.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, it is formed as an air blowing cylinder,
The outer surface of the paper feed cylinder 1 with the schematically illustrated sheet gripping device 2.3 is provided with blowholes 4, which are produced by mechanical processing, for example by drilling, over its entire cylindrical surface. It is desirable that these blow-off holes 4 are distributed in a uniform structure in the body wall 17. An insertion sleeve 5 is accommodated in the blow-off hole 4 at a position aligned with the outer surface of the body, and the openings at both ends are smaller in diameter than the insertion sleeve 5. At the bottom of the plug-in sleeve 5 there is supported a spring element 6, which is a compression spring contained therein, the spring force of which is preferably selected empirically. Above the compression spring 6 there is an air distribution member formed of a spherical or spherical paper support 7, the diameter of which is slightly larger υ than the opening on the outside of the sleeve 5.

The paper support 7 is thus held in the insert sleeve 5 and, when no force is still exerted by the sheet, the diameter of the paper support 7 and the opening of the insert sleeve 5 are adjusted by the radially outward spring force of the cylinder. (Figure 2)
.

As the paper support 7, it is desirable to use a sphere that has an ink-repellent surface, has a small specific gravity, and/or is not easily charged with static electricity.

In FIG. 4, the flow direction of the blowing air flowing through the paper roll feed cylinder 1 is indicated by an arrow 10, in which case the blowing hole 4 is connected to the insert sleeve 5 and the paper support 7 to provide a mechanical air blowing. The valve 11 is a unit.

Bearing 12 on the side wall 13 of the printing press opposite the drive side
A rotating core member 147jf is supported by the rotating core member 147jf, and a core hole 15 is provided at one end of the rotary core member 147jf. Inside the side wall 13, above the rotating core member 14, a body wall 17, preferably made by casting, is fixed to the end inner plate 16 by a seven-lung joint in a known manner.

Contrary to the basic embodiment, in this embodiment the blowout hole 4, which is a paper support receiving hole in the body wall 17, must be a through hole. An annular groove 18 is provided on the side of the end inner plate 16 facing toward the inside of the body, which communicates with the core hole 15 of the rotating core member 14 through an internal hole 19 .

The core hole 15 communicates with an air supply device 22 via a conduit 21 by means of an air conduit coupling 20 . In FIG. 4, the air passage coupling 20 is the fixed side socket body 2.
3, a coupling sleeve 24 fitted into the core hole 15 rotates within the socket body 23. Therefore, the blowing air generated by the blowing air source device 22 passes through the conduit line 21, the air line coupling 20, the core hole 15, the internal hole 19 and the annular groove 18 into the chamber in the paper roll feed cylinder 1 and into the chamber in the paper roll feed cylinder 1, It flows into the individual chambers 9 of the wall.

As shown in FIG. 5, the outer surface of the paper roll feed cylinder 1 of the basic embodiment is provided with one or more thin plates 25.
may be installed. The lamina 25 may be tension-mounted or glued and may be made of a vent-blocking material with a hydrophilic (ink-repellent) surface as shown in the left half of FIG. 5 or a vent-blocking material as shown in the right half of FIG. made of synthetic material.

The thickness of the thin plate 25 to be tensioned or glued must be within a certain distance 8 of the paper support 7 protruding from the outer surface of the cylinder.

The operation of the paper roll feed cylinder 1 according to the invention will be explained in more detail below, but it will be mentioned that the paper roll feed cylinder 1 can also be used without blowing air.

The sheet 27 immediately after printing is held by the paper gripping device 2.5.
For example, after reversal is performed in double-sided printing, the paper is received with the side with undry ink facing downward 1, that is, on the outer surface of the cylinder.

At this time, the sheet 27 does not come into full contact with the outer surface of the cylinder, but rather is supported over the entire surface or in point contact by the paper support 7 that slightly protrudes from the outer surface of the cylinder.

It is thus ensured that, although the sheet is supported very evenly, the contact area of the sheet with the supporting surface is extremely small. Furthermore, since the surface of the paper support 7 has the property of repelling ink, it is difficult for ink to be transferred from the sheet 27 to the paper support 7.

By the way, for example, if the pattern on the rubber cloth is not uniform, in the process of peeling off the sheet 27 from the rubber cloth of the rubber cylinder, there may be slight contact staining due to the ink immediately after printing, contrary to expectations. Even if this occurs, in that case the pressing force applied to each paper support 7 will not be uniform depending on the pattern. If there is even a slight relative movement of the sheet 27 with respect to the outer surface of the cylinder, the paper support 7 in contact with dry ink areas in areas prone to contact staining of the sheet 27 will be relatively receives a large amount of tension from the paper and, in turn, the force that pushes this object. As soon as this pressing force exceeds the spring force of the opposing compression spring A, the paper support 7 moves slightly radially inward of the cylinder and in this case produces a rotational movement (FIG. 3). This rotational movement results in a self-cleaning action of the paper support 7, in that if any ink adheres to the surface of the paper support 7, the ink is automatically wiped off by the rotation. The sheet 27 is therefore always supported on the uninked dotted surface portions of the paper support 7.

Selection of the spring force of the compression spring 6 to be adapted to the given conditions, such as the printing paper, the printing ink and the varying tensions exerted by them on the sheet 27,
It is preferable to do this empirically.

Another method of support to avoid contact fouling in areas prone to contact fouling is to attach a vent-blocking sheet 25 with a hydrophilic surface to the outer shell surface, as shown in FIG. 5, for example by tension or by gluing. It is something to be installed. In the region of the outer cylinder surface where the tension-fitted or glued lamella 25 is present, the covered paper support 7 is pushed into the cylinder in the radial direction.

The function of preventing contact contamination on the outer surface of the shell is that the blown air is introduced in the blowing path. The tension of the paper on the paper support 7,
Consequently, as soon as the pushing force becomes strong enough to exceed the counter force of the compression spring 6, the paper support 7 moves in the direction in which it can escape, that is, in the radial direction of the cylinder, as in the case without blowing air. trying to move inward.

The air outlet 4 of the air outlet valve 11 opens according to the tension of the paper and, in turn, the magnitude of the force pushing the paper support 7. This allows air to flow out in a distributed manner to meet the requirements of each location. produced in the direction. Therefore, in areas of the sheet 27 which are prone to contact soiling, an air cushion is formed which is particularly adapted to the local requirements, which effectively prevents contact soiling of the sheet immediately after printing.

As the degree of support of the sheet 27 by the flowing blown air increases, the degree of contact between the punctiform surface portions of the paper support 7 and the underside of the sheet immediately after printing decreases; As a result, the tension of the paper applied to the paper support 7K, in other words, the force pushing the paper support 7K is reduced. As a result, the paper support 7 tends to move radially outward of the cylinder to its lifted, unforced position, and accordingly, the degree of opening of the valve becomes smaller and the blowout The valve closes automatically as soon as air is no longer needed. For this reason, the amount of blown air may be extremely small, and therefore the blown air source device 22 can be made correspondingly small.

One advantageous method for forming an exhaustive, as uniform and undisturbed air cushion as possible is to
As the paper support 7, a sphere that is not completely finished, for example, has an uneven surface and remains rough, is used. It is likewise a good idea to use a paper support 7 that is slightly oval in shape. Due to the irregularities or roughness of the surface, the opening on the outer surface of the insertion sleeve 5 does not close completely even when no force is exerted on the paper support 7 by the sheet. This slight annular gap in the closed air outlet valve 11, which is determined by small manufacturing tolerances and/or geometry, creates a constant air cushion that ensures quiet sheet transport with no contact fouling. It can be done.

However, another method is to follow the regulations.
A paper support 7 of dimensions , perfectly spherical and with a completely smooth surface is used, and a permeable thin plate 25 is tensioned over the entire outer surface of the cylinder, or in sections targeted at areas particularly prone to contact fouling. Alternatively, a method of adhesion is also possible. The thin plate 25 is in this case as well pressed in the radial direction of the shell, so that a constant outflow of air occurs therefrom, which creates an impact flow on the surface of the permeable thin plate 250. The particles are finely divided by the thin plate 25 so as to be distributed over a wide range without any generation of particles. Therefore, areas in the pattern of the sheet 27 that are particularly susceptible to contact staining are supported by air cushions that are selectively generated there. The maximum thickness 26 of the sheet 25 is such that it is no higher than the adjacent unpressed paper support 7, so that the sheet 27 rests flat in all directions in all its areas.

It is understood that the invention is not limited to the embodiments shown and described in the drawings. Numerous structural changes have been made, such as changing the shape of the outlet holes 4 and the air distribution element 7, using a different type of spring element 6 that generates the pressing force, or also changing the construction material of the air distribution element 7. Naturally, it is within the scope of the present invention to select a different one as the above.

[Brief explanation of drawings]

1 is a simplified cross-sectional view of a paper roll feed cylinder of a basic embodiment according to the invention, and FIG. 2 is a detailed view of a portion of FIG. 1, with one paper support 7 in the unloaded state. FIG. 3 is a diagram showing one paper support 7 under force, FIG. FIG. 5 is a cross-sectional view of the paper winding feed cylinder shown in FIGS. 1 and 4 with various outer surface configurations. 1.Paper winding feed cylinder 2,6..Paper gripping device 4..Blowout hole 5..Insertion sleeve 6.Compression spring
7...Paper support 8...Constant distance 9...
・Chamber 10 in the barrel wall 10 Air flow direction for blowing 11 Air blowing valve 12 Bearing 13 Side wall of the printing press 14 Rotating core member 15 Core hole
16... End disk 17. Trunk wall 18...
Annular groove 19...Internal hole 20...Air path coupling 21...Conduit path 22...Blowout air source device 23...Coupling socket body 24...Coupling sleeve 25...Tension mounting Alternatively, the adhesive thin plate 26...thickness of the tension-mounted or glued thin plate 27...Sheet paper patent applicant Heidelberger Dortskumasinenakchengesellschaft

Claims (1)

[Scope of Claims] 1. A contact stain-proof paper roll for a sheet-fed rotary printing press, in which mechanically processed blow-off holes are distributed over the entire cylindrical surface on which the sheets are placed on the drum wall. In the feed cylinder, an air distribution member (7) is installed in the blow-off hole (4) in the cylinder wall, which regulates the flow of air blown therefrom in such a way that it forms a uniform air cushion. , this air distribution element (7) is supported in such a way that it can be retracted in the radial direction of the cylinder, and when the tension of the printing sheet (27) exceeds a certain limit, i.e. the force pushing it exceeds a certain limit. A paper roll feed cylinder of the contact and stain-proof type, characterized in that it is designed as a spherical or spherical paper support (7) which automatically retracts when exceeded and can rotate in any direction. 2. The paper support (7) is pressed in the blowing hole (4) in the radial direction of the cylinder towards the outer surface and at a certain height (8
2. A paper winding feed cylinder of a contact stain-proof type according to claim 1, wherein the paper winding feeding cylinder is of a contact and stain-proof type and protrudes from the outside surface of the cylinder by an amount corresponding to the length of the cylinder. 3. As a holding member for the paper support (7), it has openings at both ends, the diameter of the opening on the side of the outer surface of the body is slightly smaller than the diameter of the paper support (7), and the bottom part is a compression spring (6). Claims 1 or 2, in which an insertion sleeve (5) adapted to support the
A paper roll feed cylinder that prevents contact and contamination as described in 2. 4. A blowing air source in which the blowing hole (4) is automatically controlled in conjunction with the paper support (7) in accordance with the tension of the paper acting on the paper support (7) and the force with which it is pushed. Device (22
4. A contact-contamination-proof paper roll feed cylinder according to claim 1, wherein the paper roll feed cylinder is configured as an air blow-off valve (11) receiving air supply from an air blowing valve (11). 5. Any one of claims 1 to 4, wherein the air leaked from the air blow-off valve (11) when it is closed is used to form a certain air cushion. A paper roll feed cylinder that prevents contact and contamination as described in 2. 6. Rough and/or different tolerances are provided in the production of the plug-in sleeve (5) and/or the paper support (4) so that the escape of the blowing air is ensured. The contact stain-proof paper roll feed cylinder according to any one of Items 1 to 5. 7. In areas prone to contact fouling on the outer surface of the cylinder, a thin plate (25) of selectable size can be attached at least partially under tension or adhesively. 6. The paper-wound feed cylinder of the contact stain-proof type according to any one of item 6. 8. Thin plates attached or glued under tension (25
), the thickness (26) of which does not exceed a certain distance (8) by which the paper support (7) projects beyond the outer surface of the cylinder. The paper roll feed cylinder described above is of a type that prevents contact and contamination. 9. Thin plates attached or glued under tension (25
) is formed to allow air to pass through, thereby providing a uniform distribution of air in areas on the outer surface of the shell where contact fouling is likely to occur.
The contact stain-proof paper-wrapping feeding cylinder according to any one of Items 1 to 8. 10. When operating the paper roll feed cylinder without blowing air, thin plates (2
9. The contact stain-proof paper roll feed cylinder according to claim 1, wherein 5) is made of a material that is air-blocking and ink repellent.