JPH07256864A - Web rotary press with replaceable cylinder cover and method for replacing cylinder cover - Google Patents

Abstract

PURPOSE: To rapidly exchange a cover of cylinders in a web-fed printing machine. CONSTITUTION: An aperture 10 is formed in a wall 9 of a printing machine and longitudinal slots 11, 12 are formed toward the opening 10 on cylinder jackets of cylinders 1, 2, respectively, in parallel to the axes thereof. These slots 11, 12 lead to slots for receiving ends of covers or slots including devices for stretching covers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web-fed rotary printing press having a replaceable cylinder cover and a method of replacing the cylinder cover, and more particularly, to a position of at least one cylinder to which a cover, particularly a printing plate or a blanket is attached. Correspondingly, an opening is formed in the side wall of a web-fed rotary printing press, the cylinder cover being able to be inserted into or removed from the printing press through the opening, and a method for replacing said cover of a cylinder. It is about.

[0002]

[Prior Art and Problems to be Solved by the Invention]
A printing plate cylinder in a web-fed rotary printing press.
There is known a printing plate having an end portion which is sandwiched by a chuck groove formed on the substrate (for example, DE-AS 27 59 434 specification). One end of this printing plate is inserted into the groove for tensioning. In the tip operation, the printing plate cylinder is rotated to wind the printing plate on the cylinder. Then, the other end of the printing plate cylinder is inserted into the groove. If necessary, the end of the printing plate is later drawn into the chuck groove by the operation of the tension member. However,
This process takes a very long time. Also, the paper roll must be cut. Subsequent web-in feed causes loss of time in addition to the generation of waste paper. The non-continuous blanket of the transfer cylinder is also replaced in a similar manner (eg DD 248 695 A3 specification),
Therefore, the same adverse effects as described above are involved.

Both the printing plate and the blanket can also be formed as continuous articles in the form of sleeves (DE 35 43 704 A1 specification). The sleeves are attached to or removed from the corresponding cylinders through openings formed in the side walls of the printing machine. This can be done quickly without manipulation of the tip and is even possible in a retracted transport path. For example, a laser welding machine is required for producing the sleeve, and a seamless type or a sleeve produced by plating is also used.

The present invention allows the cylinder cover to be replaced at low cost, maintaining the advantages without compromising the original function of the apparatus, and without the need for welding, plating or roll forming the sleeve. It is intended to provide a generic web-fed rotary printing press and a method for replacing a cover.

[0005]

The present invention solves the above problems by an apparatus described in claim 1 or a method described in claim 7. Since the present invention does not require tip manipulation and cutting of the web, it is possible to quickly replace a discontinuous cylinder cover, such as a printing plate or blanket. Conversely, you can take advantage of those flat covers. No application of laser technology is required. In the present invention, all that is required is a plate and, optionally, a bending machine for folding the edges of the blanket carrier. The printing image can be transferred to the printing plate in a flat state as usual, and can be stored for transportation and space saving. Therefore, the printing plate and the blanket can be accurately fixed by the conventional tension member. Thereby, it is possible to make the registration and securely fix it. It is also possible to directly lay the adjustment sheet under the printing plate, which is conventionally used for tensioning the discontinuous offset printing plate in order to compensate for the thickness tolerance. The edge of the plate is inserted into the groove of the cylinder in the axial direction of the cylinder, so that the cylinder gap can be made very narrow. This is actually 2 of the plate thickness
It is sufficient to set the size to slightly more than double. That is, for example, the offset printing plate has a thickness of 0.3.
If it is mm, the width of the cylinder gear is about 0.8 mm. Due to this narrow cylinder gap, larger plates can be realized, or smaller cylinders can be used for the same plates to save paper.
In addition, the cost is reduced because it is not necessary to supply air to the cylinder. Furthermore, the vibration characteristics of the printing machine are also improved. Further effective embodiments will be apparent from the dependent claims and the specification.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the two cylinders 1, 2 of the printing mechanism. Both of these cylinders are journaled on the drive side wall 5 by journals 3 and 4, respectively. The operating-side journals 6, 7 of the cylinders 1, 2 are journaled in two carrier walls 8 mounted on a side wall 9. These carrier walls 8 cover the openings 10 which open into the side walls 9. These carrier walls 8 are vertically separated and can be removed horizontally from the journals 6, 7. In this case, the opening 10 is exposed.

The cylinder jackets of the cylinders 1 and 2 are provided with vertical grooves 11 and 12 extending in the direction parallel to the axis and opening at the tip of the cylinder body (FIGS. 2 and 3). The ends of the vertical grooves 11 and 12 have the openings 10
It is sufficient to open the side wall 9 having the side wall. An insertion taper 13 is provided at the tip of the cylinder facing the side wall 9 in each of the vertical grooves 11, 12.
Are formed (FIG. 3). Tapers 14 and 15 are formed at the ends of the cylinder jacket of each cylinder. In this embodiment, the cylinder 2 is formed as a printing plate cylinder. The cover for this cylinder (printing plate cylinder) 2 is shown in FIG.
The printing plate 16 shown in FIG. The flutes 12 of the cylinder 2 extend to a channel 17 containing a tensioning device 18 for this printing plate 16. In FIG. 6, the flutes 12 and the tensioning device 18 are shown as having a configuration different from that of FIG.

The printing plate 16 is replaced by the printing plate cylinder 2
First, the opening portion 10 of the side wall 9 is exposed in order to be attached to. Therefore, the carrier wall 8 is opened.
A detailed description of this process is omitted because it is not the subject of the present invention. One way to achieve this is, for example, EP 0 352.
599 B1 Explained in the description. It is also known from the prior art to form an opening 10 in the side wall 9 that is larger than the diameter of the cylinder 2 in the printing plate tensioned state. The cylinders 1 and 2, which are not bearing on the operating side, are kept in a horizontal position by support members 19 and 20 acting on the journals 3 and 4 of the cylinders 1 and 2 on the driving side. Again, the person skilled in the art is familiar with solutions from the prior art (eg EP 0 279 349 A2). The printing plate 16 to be stretched is bent into a cylindrical sleeve shape, and the bent end portions 21 and 22 are brought into contact with each other. The printing plate 16 thus formed is mounted on the printing plate cylinder 2 through the opening 10 of the side wall 9. Here, the mounting work to the cylinder 2 is performed by the taper 15, and the end portion 21,
The work of inserting the groove 22 into the vertical groove 12 can be easily performed. When mounting, the edges 21 and 22 of the printing plate 16 are stretched by the tensioning device 1
Step 8: Enter the tension member. That is, in this embodiment, the end portions 21 and 22 are terminated by the hook 23 provided in the vertical groove 25 of the tension spindle 26 or the wire 24 wound therein ( (Figure 6). When the tensioning spindle 26 is rotated, the end portions 21 and 2 are
2 is drawn deeper into the flutes 12, which stretches the printing plate 16.

Other tensioning mechanisms may be utilized in utilizing the present invention. For example, the flutes do not have to extend to the tension groove, but the end of the tensioned printing plate can be stuck in the flute itself. The edges of the printing plate are glued together to make it easier to bend the printing plate into a circle. Furthermore, the present invention provides another cylinder cover, for example, a blanket for a transfer cylinder (relay cylinder),
Alternatively, an impression cylinder can be attached to the body.

Further, in the printing machine according to the present invention, a cylinder for a printing plate having an end portion or a sleeve-like (no end portion) printing plate can be selectively used, and both the groove technique and the sleeve technique can be used. It is also possible to apply the technology. That is, it is possible to apply groove technology to one cylinder and grooveless technology to another cylinder.

According to the present invention, not only the cover but also the cylinder body itself is taken out from the opening of the side wall of the printing mechanism,
Alternatively, it can be inserted. In this case, if the cylinder is formed as a printing plate cylinder, it is possible, for example, to replace the cylinder body with another printing plate type. Furthermore, the cylinder body can be exchanged for another printing method. For example, a cylinder body having one groove for a discontinuous offset printing plate is replaced with another cylinder body in which the gravure printing plate is engraved in the cylinder jacket. In this case, a hybrid printing machine is realized. Figure 7
Shows an example of such replacement. The cylinder 27 is supported by the side wall 30 and the carrier wall 31 by the journals 28 and 29, respectively. Body 32 of cylinder 27
Are connected so as to be detachable from the drive-side journal 28 via a conical portion 33. To remove the cylinder body 32 from the printing mechanism, first the openings 34 formed in the side walls 35 are exposed by moving the carrier walls 31 away from each other. In this case, the cylinder 27 is held in a horizontal position by a support device 36 acting on the journal 28. Next, an operating device (not shown), such as a robot, pulls the cylinder body 32 together with the journal 29 from the conical portion 33, and removes it from the printing mechanism through the opening 34 larger than the diameter of the cylinder body 32. Subsequently, the other cylinder body or the cylinder body 32 to which another cover is attached is set in the reverse order. Detaching the cylinder body from the drive journal can be done in other ways. For example, it is possible to set a separation point in the journal portion on the driving side, or to simply pull out the main body of the cylinder from the cylinder shaft.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a partial cross-section of a printing mechanism of a web-fed rotary printing press according to an embodiment of the present invention.

2 is a partial schematic side view of the printing mechanism shown in FIG. 1 as seen from an arrow Z. FIG.

3 is a partial schematic side view of the printing mechanism shown in FIG. 1 viewed from an arrow Y. FIG.

FIG. 4 is a side view of the printing plate before being stretched.

5 is a side view showing the printing plate shown in FIG. 4 in a state of being bent in a circle.

FIG. 6 is a partial cross-sectional side view of the cylinder showing a state where the end portion of the printing plate is inserted into the vertical groove of the cylinder.

FIG. 7 is a partial sectional front view showing another embodiment of the present invention.

[Explanation of symbols]

 1, 2 Cylinder 9 Side Wall 10 Opening 11, 12 Vertical Groove 16 Printing Plate (Cover) 17 Tension Groove 18 Tensioner

Claims (8)

[Claims] 1. An opening is formed in at least one side wall corresponding to a position of at least one cylinder covered by a cover such as a printing plate or a blanket, and the cover is inserted into a printing machine through the opening, or In a web-fed rotary printing press that can be taken out from the printing machine, a cylinder jacket of a cylinder (1, 2) is provided with an opening (1) parallel to the axis of the cylinder and of a side wall (9).
Vertical grooves (11, 12) open toward 0) are formed,
The vertical groove houses the folded end of the cover,
Alternatively, the tension groove (1) including the tension device (18) for the cover is used.
A web-fed rotary printing press with a replaceable cylinder cover, which has the features up to 7). 2. The web-fed rotary printing press according to claim 1, wherein the vertical grooves (11, 12) are cylinders (1, 2).
A web-fed rotary printing press, comprising a taper surface (13) for insertion toward the front end surface of the web. 3. The web-fed rotary printing press according to claim 1, wherein the body (32) of the cylinder (27) can be inserted into or through the printing machine through an opening (34) in the side wall (35). A web-fed rotary printing press that can be taken out. 4. The web-fed rotary printing press according to claim 3, wherein the cylinder (27) is a printing plate cylinder, the body (32) of which is replaceable with a body for another printing plate type. A web-fed rotary printing press that is characterized by 5. The web-fed rotary printing press according to claim 3, wherein the main body (32) of the cylinder (27).
The journal (2 facing the opening in the side wall (35)
9) A web-fed rotary printing press, which is replaceable together with 9). 6. The web-fed rotary printing press according to claim 3 or 4, wherein the main body of the cylinder can be pulled out from the cylinder shaft. 7. A method for replacing a cover such as a printing plate or a blanket, which is attached to a cylinder of a web-fed rotary printing press, wherein a cover having an elastic plate shape in an initial state is manually bent into a cylindrical shape. Then, the cover having a shape similar to that of the cylinder is inserted into the printing machine through the opening formed in the side wall to cover the cylinder, and the end of the cover is attached to the cylinder. A method of replacing a cylinder cover, which comprises inserting the cover in a vertical groove and removing the cover in the reverse order. 8. A method according to claim 7, characterized in that the edges (21, 22) of the cover are glued together so as to form and maintain a circle.