Printing – Flexible-sheet-securing devices
Patent
1994-06-09
1995-03-21
Eickholt, Eugene H.
Printing
Flexible-sheet-securing devices
B41F 2904
Patent
active
053986091
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for tensioning and adjusting flexible printing plates on plate cylinders of rotary presses.
THE PRIOR ART
In sheet-fed rotary presses, there are made efforts to shorten the set-up times and auxiliary times, with increasing the printing quality at the same time. In this connection, it is important to clamp and to adjust the flexible printing plates within a short time.
According to the German patent document DE 29 35 699 A1, there is known a device for a register-true tensioning of printing plates in printing presses, at which a tensioning bar has mirror-invertedly arranged wedge-levels. There can be thrown-on against these wedge-levels, sliding wedge-levels of sliding blocks, arranged on an adjustment spindle having a thread with an opposed direction, so that the tensioning bar is tensioned parallely to the cylinder axis.
A disadvantage of this device is, that the groove itself has to have a certain width, simply for receiving the adjustment elements, acting in the plate tensioning direction.
A further disadvantage is, that a plurality of lever arrangements are used and an adjustment of the printing plate is not possible, in consequence of a parallel guiding of lazy tongs.
SUMMARY OF THE INVENTION
It is the object of the invention, to provide a device for a remote tensioning and a remote one-piece adjustment of flexible printing plates on plate cylinders of sheet-fed rotary presses, in which the space requirement for the device for the generation of the force for the tensioning movement is small.
By the invention, especially the following advantages are achieved. By the arrangement of especially two drives, it has become possible, to tension and to adjust the printing plate by the simple linear deflection of one printing plate end. A swivelling or diagonal adjustment, as well, of the printing plate, is possible, when the second quick-acting tensioning device for holding and tensioning the leading printing plate edge is equipped with a drive according to the invention. In this connection, there do not occur any bending moments in parts, which require an overdimensioning and thus have a high space requirement. The forces are transmitted via the wedge-areas by means of pressure. The points of introduction of force are situated near the circumference of the cylinder, which avoids greater lever transmissions.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is to be described at several embodiments.
The accompanying drawings show in
FIG. 1 a longitudinal cut through the groove of the plate cylinder with the device according to the invention,
FIG. 2 a second embodiment according to the representation according to FIG. 1,
FIG. 3 a third embodiment,
FIG. 4 the cut IV--IV according to FIG. 1,
FIG. 5 a second embodiment of the pressure bar,
FIG. 6 to 9 further embodiments of drives according to FIG. 3 for the generation of a radial movement of the pressure bar.
According to FIG. 1, there is shown a longitudinal cut through the groove of the plate cylinder with the device according to the invention. The cut extends along the line I--I according to FIG. 4. The associated FIG. 1 shows this cut. The shown parts according to FIG. 4 exist in mirror-inverted form two times for each cylinder. This is clarified by a vertically extending center line 37. The plate cylinder 1 has at its surface an axially extending cylinder groove 2; 3, each of them limited in its length by the front sides 4; 6 of the plate cylinder 1 and by plinths 7; 8. Between the plinths 7; 8, there is arranged a channel groove 9, which is situated lower in relation to the cylinder grooves 2; 3, for receiving the drive of the device. The plinth 7 ends in a slant 11, extending in the direction of the channel groove 9, whereas an area 12 of the plinth 8 extends horizontally. A pressure bar 13, extending in the axial direction, is arranged in a recess between the upper cylinder gap side wall 14 and the lower cylinder gap side wall 16. The pressure bar 13 has on its side, directing to the channel
REFERENCES:
patent: 2578406 (1951-12-01), Dutro
patent: 2837025 (1958-06-01), Pechy
patent: 2946282 (1960-07-01), Harless
patent: 3119331 (1964-01-01), Koch et al.
patent: 3795193 (1974-03-01), Johne et al.
patent: 4688484 (1987-08-01), Herold et al.
patent: 4712476 (1987-12-01), Jeschke
patent: 4785736 (1988-11-01), Jeschke
patent: 4840121 (1989-06-01), Szczesniak
patent: 4938135 (1990-07-01), Wieland
patent: 5016531 (1991-05-01), Schroeder
patent: 5097763 (1992-03-01), Simeth
patent: 5189958 (1993-03-01), Tafel et al.
MESA Technical Brochure-Oct. 21, 1991.
Eickholt Eugene H.
Koenig & Bauer Aktiengesellschaft
LandOfFree
Device for tensioning and adjusting flexible printing plates on does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for tensioning and adjusting flexible printing plates on , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for tensioning and adjusting flexible printing plates on will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1142526