EP1228823B1 - Punching device for punching printing plates and plate exposure system provided with a punching device - Google Patents

Description

The invention relates to a punching device for punching, in particular the Register punching, of printing plates, in particular for arrangement in the area of a Printing platesetter, preferably in the edge region of a trough of an inner drum platesetter, comprising a punch that is transverse or more or less perpendicular to a positioning surface for the printing plate to be punched is guided movably and drivably and with a punching tool for overlapping the edge of the pressure plate to be punched.

The invention further relates to a printing platesetter, preferably one Inner drum printing platesetter, with at least one punching device is equipped according to the invention.

A punching device of the type mentioned above is known from EP 0 759 851 B1 known.

Such punching devices are used for punching recesses in printing plates, especially in offset printing plates, with the help of which the printing plates are in front fits the print, especially for a harmonious multi-color print register accurate, clamped in the printing press, preferably on one Printing plate cylinder can be clamped. This is done with the punched recesses especially the dimensional reference of the printing area of the Printing plate, that is the area of the previously exposed in the printing platesetter Printing plate, made for the printing form cylinder. Such a die cut could also outside of the platesetter in a separate punching device take place, which in part actually happens, but to achieve an accurate Dimension of the punched recesses to the exposed area better and more accurately should be done in the platesetter itself and mostly now is also made. Such punching devices are therefore preferred arranged in platesetters themselves, whereby inner drum, flat bed and outer drum platesetters. In the cited publication is referred to an inner drum platesetter, which also is preferred in the present invention.

With an inner drum platesetter, the printing plate to be exposed is in the inside, namely in the trough, introduced into an approximately semi-cylindrical drum and there usually by negative air pressure (vacuum) in the exposure position fixed. The exposure is then usually carried out with laser light, this low energy, e.g. B. infrared, which can be a daylight-sensitive Exposure like a film that needs to be developed and fixed leads or the laser light can be of higher energy, e.g. B. ultraviolet, resulting in a daylight-insensitive, thermal exposure leads.

The exposure device is essentially in both methods Area of the cylinder axis of the inner drum. In addition, the pressure plate must Exposure was placed in the well and after exposure from the well again are removed, for which the interior of the imagesetter drum is also used got to. For the arrangement of the punching device or the punching devices there is not much space left. The known punching device is used on the and outlet side for the pressure plate opposite edge of the trough arranged.

But to expose printing plates with different formats in the same trough should be, it means that a relatively smaller pressure plate after the Exposure from the exposure position initially against its exit direction moved to the punching device and in contact with the punch for the execution of the punching must be brought before it in the exit direction can be removed from the trough. This makes handling (handling) the printing plate more difficult, time consuming and inaccurate.

Add to that that different printing presses from different manufacturers Punchings must be made, especially the recesses, which are usually U-shaped or tongue-shaped, differ protrude deep into the printing plate surface or have to lead into it. This means that with the same punching tool, the edge of the respective printing plate must be positioned differently from the punching tool of the punching tool can be avoided. This also makes handling a printing plate in the platesetter difficult and time consuming.

For rarer presses, the die cut may not work with the intended one Punching device can be made in the platesetter, but must be in a separate, external punching device, possibly at the printing press operator, be made. Nevertheless, at least one should already do so dimensional positioning of the exposed surface of the printing plate to the edge of the Pressure plate in the platesetter itself to make an exact external punching prepare and ensure, without this in turn the handling the printing plate in the platesetter is more difficult and time consuming.

The invention is therefore based on the object of a punching device at the beginning mentioned type with a view to easier handling of the Continue winding the printing plate in the platesetter.

This object is achieved according to the invention in a generic ramming device by means of a punching device, which as Pull punch is formed, in which the punching tool is completely through The pressure plate to be punched can be pulled through and in or below its positioning surface retractable is. Below the positioning surface "is not necessarily perpendicular To understand direction, but in the sense of on the exposure side of the Printing plate facing away from the back of the printing plate ".

Since according to the invention the punch in the positioning surface of the printing plate is retractable, is particularly advantageous in this position of the punch the pressure plate can also be moved over the area of the punching device without the punching device interferes with this movement. This makes handling the printing plate in the platesetter easier. The punching device can namely in the path of movement of the pressure plate, for. B. on the entry and exit side for the printing plate. For one according to the invention trained platesetters also claim independent protection.

For the introduction to the platesetter, the printing plate can be recessed Punching device are moved away and first in the exposure position be exposed. For punching, the exposed printing plate is placed on the meanwhile brought into functional position punching device moved, especially if this is necessary for a relatively small format printing plate, but with advantage in the direction in which the printing plate is to be removed from the platesetter anyway must be moved. After punching, that's through the pressure plate solid punch sunk again, so that the pressure plate then out from the platesetter, again over the punching device can. A semi-automatic or fully automatic printing plate input and - Output can be controlled and controlled much easier and cheaper perform faster, with more precision.

In a preferred embodiment, the punch comprises the punching device a shaft and a punch head with a punch protruding from the shaft. This not only enables the edge of the printing plate to be overlapped the punching tool for punching but the different sections of the Stamping stamps can also be made according to preferred developments of the invention various positioning tasks for the edge of the printing plate in an advantageous manner Way take over.

The extended shaft of the punch can be used to punch the printing plate serve as a stop for the edge of the pressure plate, so that the overlap depth of the punching tool over the edge of the printing plate precisely and reproducibly is set. Are now, as preferably provided according to the invention, on Shaft with different radial extension and different stop areas provided for the printing plates by different extended positions of the shaft in the positioning plane of the pressure plate brought into effect can be, so different, precisely adjustable overlap depths of Punching tool can be selected, especially with respect to different Printing machines from different manufacturers.

Even if, for example in relation to a rarer printing press, a die cut in the Platesetter should not be made, according to another training the invention of the slightly extended punch head as a stop serve to align the pressure plate, in particular for dimensional adjustment the area of the printing plate to be exposed to the edge of the printing plate in With regard to the later punching.

With its movement into its recess, the punching tool takes away the punching waste with, which according to a development of the invention in the sinking by a Failure chute can be ejected.

For a register punch, platesetters are preferred several punching devices arranged at a distance from one another are provided.

Fig. 1

eine Schnittansicht einer erfindungsgemäßen Stanzeinrichtung mit daran vorbeilaufender Druckplatte,

Fig. 2

die Stanzeinrichtung gemäß Fig. 1 im Schnitt mit anschlagender Druckplatte,

Fig. 3

die Stanzeinrichtung gemäß den Fig. 1 und 2 nach einer Stanzung,

Fig. 4

eine Druckplatte im Anschlag am Schaft eines Stanzstempels einer Stanzeinrichtung gemäß den Figuren 1 bis 3,

Fig. 5

eine Druckplatte im Anschlag am Stanzstempelkopf eines Stanzstempels gemäß Fig. 4 und

Fig. 6

eine Druckplatte im Anschlag in einem Rezeß des Schaftes gemäß Fig. 4.

An embodiment of a punching device according to the invention is shown in the drawing. They show schematically:

Fig. 1

2 shows a sectional view of a punching device according to the invention with the pressure plate running past it,

Fig. 2

1 in section with the pressure plate striking,

Fig. 3

the punching device according to FIGS. 1 and 2 after punching,

Fig. 4

a pressure plate in the stop on the shaft of a punch of a punching device according to Figures 1 to 3,

Fig. 5

a pressure plate in the stop on the punch head of a punch shown in FIG. 4 and

Fig. 6

a pressure plate in the stop in a recess of the shaft according to FIG. 4th

Fig. 1 shows in section an embodiment of a punching device according to the invention. The punching device comprises a punch 1 with a shaft 2 and a punch head 3 which has a punch 4, namely a punch finger or a punching needle. The shaft 2 is in a guide 5 one Punching head 6, into which the punch head can be lowered. The stamp 1 is extendable from the punching head 6 in the direction of the double arrow 7 and retractable. For this purpose he is in the embodiment shown with a Spindle 8 driven. Other drives can also be considered.

On a positioning surface 9 in the area of the punching device with an end surface of the punching head 6 coincides with a pressure plate on the punching device 10 passed or over the punching device with its recessed punch led away, in the direction of arrow 11 in a not closer shown trough of an inner drum printing platesetter into it Edge of the punching device is arranged. In the drawing it can be seen that the pressure plate 10, which is shown broken off, the only indicated curvature the hollow follows.

Fig. 2 shows the punching device according to Fig.1, also in section, with another Position of the punch 1. The punch 1 is so far from its Retracted that the punch 4 in the functional position for a punching process. The pressure plate 10 to be punched is already corresponding positioned by abutting against the shaft 2 of the punch 1 located. For this purpose, the pressure plate was previously in the direction of arrow 12 against the Shaft 2 of the punch 1 shifted.

3 shows the punching device, again in section, after the punching process, that is, after the punching head 3 produces a recess 13 through the Pressure plate 10 has been pulled and sunk again in the punch head 6 is. The punching waste 14 from the recess 13 is through a chute 15 ejected from the punching head 6.

The shaft 2 of the punch 1 also has a recess 16 as an alternative Stop area for the pressure plate 10 can act as related will be explained in more detail with the following figures.

Figures 4 to 6 show in section the punching device according to the previous ones Figures with different functional positions of the punch 1, -wherein The same components are designated with the same reference numbers as in the previous figures.

4, the punch 4 is in the punching position, the punch stamp 1 is extended accordingly far from the punching head 6. The pressure plate 10 is located itself against the shaft 2, in the area with the larger one Diameter outside the recess 16. The representation in FIG. 4 corresponds so that Fig. 2nd

This positioning of the pressure plate for the accurate punching of a recess 13 is correct for some printing presses. The stop of the pressure plate 10 on the shaft 2 defines the overlap depth of the punch 4 over the edge the pressure plate 10 and thus the depth of the recess 13.

In Fig. 6, the pressure plate 10 strikes in the recess 16 on the shaft 2, for which the The punch 1 is extended a little less from the punch head 6 than in of Fig. 4. This overlaps the punch 4 over the edge of the Pressure plate 10 larger and the recess 13 deeper, what for some others Printing presses is correct. You can see the depth of overlap of the punch Designate X or Y over the edge of the printing plate in FIGS. 4 and 6.

In FIG. 5, the punch 1 is moved further into the punch head 6 than 6, but the punch head 3 still protrudes from the punch head 6 or so that it can serve as a stop for the pressure plate 10, as shown a measure of the distance of the surface to be exposed from the edge of the Find and set pressure plate 10, in the event that for a rarer Printing machine no punching can be made with the punch 4 should.

Claims (9)

1. Punch device for punching, and in particular registration notching, printing plates, in particular for arrangement in the region of a direct-to-plate recorder, preferably in the edge region of a trough of an internal drum recorder, comprising a punch (1) which is guided movably and drivably at right angles or more or less perpendicularly to a locating face (9) for the printing plate (10) to be punched, the punch being equipped with a punch tool (4) for overreaching the edge of the printing plate (10) to be punched, characterized in that the punch device is configured as a pull-through punch wherein the punch tool (4) can be pulled completely through the printing plate (10) to be punched, and retracted into or below its locating face (9).
2. Punch device according to Claim 1, characterized in that the punch (1) has a shank (2) and, at the free end of the shank (2), a punch head (3) which includes the punch tool (4) projecting from the shank (2).
3. Punch device according to Claim 2, characterized in that the punch head (3) is intended to serve as stop for the printing plate (10) to be positioned and in that an extended position is provided for the punch (1) in which the punch head (3) is raised above the locating face (9) for the printing plate (10) but the punch tool (4) does not yet occupy its functional position.
4. Punch device according to Claim 2 or Claim 3, characterized in that the shank (2) is intended to serve as stop for the printing plate (10) to be positioned and in that an extended position is provided for the punch (1) in which the punch tool (4) is raised into its functional position above the locating face (9) for the printing plate (10).
5. Punch device according to Claim 4, characterized in that the shank (2) offers at least two stop positions for the printing plate (10) to be positioned in which the punch tool (4) overreaches the edge of the printing plate (10) by different amounts, and in that a plurality of positions of the punch (1) are provided which correlate with the stop positions of the shank (2) so that a selected stop position of the shank (2) is set up in the locating face (9) for the printing plate (10).
6. Punch device according to any one of the preceding claims, characterized by a discharge chute (15) for the punchings (14).
7. Direct-to-plate recorder, preferably an internal drum recorder, equipped with at least one punch device configured as a pull-through punch according to one of the preceding claims, characterized in that the punch device is arranged in the motion path of the printing plate (10) to be exposed.
8. Direct-to-plate recorder according to Claim 7, characterized in that the punch device is arranged on the entry side and/or exit side for the printing plate (10).
9. Direct-to-plate recorder according to Claim 7 or Claim 8, characterized in that a plurality of punch devices are arranged, spaced apart, transversely across the motion path of the printing plate (10).

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