Printing – Printing members – Blanks and processes
Patent
1997-01-30
1999-04-27
Burr, Edgar
Printing
Printing members
Blanks and processes
101401, B41N 600
Patent
active
058968156
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a punch module for printing plate exposers. In printing technology, printing plates are normally provided with a register punching with which, during clamping onto the printing cylinder of sheet-fed or rotary offset machines, they are positioned at their outer dimensions. The dimensional relation of the printing surface in relation to the printing cylinder is thus produced.
The printing plates are previously exposed in a printing plate exposer and are provided with a register punching. Today, what are known as interior drum exposers are used for this purpose, which are already in use for film exposure. Reference is made here to DE-PS-41 24 004. In the figure of this letters patent, it is shown how a film is placed in the interior drum is exposed. In a printing plate exposer of this type, in place of the film the unexposed printing plate is guided into the cavity from one side and is brought into the exposure position. The interior space of the cavity is occupied by the exposure optics and the transport system, and there is no room to attach a punch in the interior space, with which the register punching could be carried out on the end of the plate.
SUMMARY OF THE INVENTION
An object of the invention is to create a punch module for carrying out the register punching that requires the least possible interior space of the cavity.
According to the invention, a register punch system is provided for a printing plate wherein the printing plate is located in a circular segment cavity of a printing plate exposer. A plurality of punch modules are arranged next to one another on a base plate at one end of the cavity outside and inside of the cavity where the printing plate is located. The punch modules each comprise a guide block arranged on the base plate, a stamping punch guided inside the guide block, a connecting rod for actuating the stamping punch, and a stripper plate on the base plate at an end of the base plate facing the cavity and through which the stamping punch is guided. The stamping punch has a cutting finger at an end that reaches through the stripper plate, the cutting finger reaching over the end of the printing plate so that the stamping punch can be actuated through the connecting rod, a punching being carried out at the end of the printing plate upon a drawing back of the stamping punch, and the punched-out material of the printing plate being transported by the cutting finger through the stripper plate.
In the following, the invention is specified in more detail on the basis of FIGS. 1 to 4. There is shown in:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective exploded view of the cavity of the plate exposer and of the punch module,
FIG. 2 is a sectional drawing through the punch module,
FIG. 3 is an arrangement for a register system with 4 punch modules; and
FIG. 4 is an example of a sectional view of the punch.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows the printing plate as it lies in the cavity of the plate exposer. A punch element is shown in perspective in its individual parts in the upper part of the drawing. The stamping punch 1 is guided in a guide block 2 and is actuated through a connecting rod 3 by means of a cam. The stamping punch 1 runs in addition through a stripper plate 4. The entire construction is fastened on a base plate 5. The connecting rod 3 is actuated by a drive shaft 6. The punched-out recesses 7, which represent the register punching, can be seen at the upper end of the printing plate. According to the register system used, several punch elements can be arranged on the base plate in a spacing predetermined by the respective register system, which is shown later in more detail in FIG. 2.
As can be seen, the entire interior space of the cavity remains free for the optical system and for the transport mechanism (not shown) for the plate. Only the cutting fingers and the stripper plate of the punch element are located in the cavity. A further advantage is that the punched-out material of the pl
REFERENCES:
patent: 3585928 (1971-06-01), Kaneko
patent: 4936212 (1990-06-01), Moss
patent: 5500656 (1996-03-01), Behrens et al.
Burr Edgar
Colilla Daniel J.
Linotype-Hell AG
LandOfFree
Punch module for printing plate exposers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Punch module for printing plate exposers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Punch module for printing plate exposers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-677398