Geometrical instruments – Gauge – Collocating
Patent
1992-08-27
1994-08-16
Cuchlinski, Jr., William A.
Geometrical instruments
Gauge
Collocating
1014151, B41B 1100
Patent
active
053374860
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates generally to a mechanism for adjusting the skew angle of inclination (hereinafter often referred to simply as "the inclination") of a printing plate engaging the periphery of a plate cylinder, for the purpose of resister correction, the printing plate being releasably secured to clamping bars by its heading and trailing edges as considered in the direction of printing cylinder rotation.
More specifically, the invention concerns such a plate registry correction mechanism wherein the clamping bars are disposed in an axis-parallel gap in the periphery of the plate cylinder and are adjustable tangentially for clamping the printing plate. A pivotally mounted lever system also is provided in the cylinder gap and is articulated to the facing edges of the clamping bars to enable the latter to be moved in opposite directions and substantially in axis-parallel relationship for the inclination adjustment. The invention also relates to a mechanism for releasing and clamping a printing plate engaging the periphery of a plate cylinder. The leading and trailing edges of the printing plate as considered in the direction of printing rotation are releasably secured to clamping bars disposed in an axis-parallel gap in the plate cylinder and are adjustable tangentially for the purpose of clamping the printing plate. The clamping bars are movable where the ends of the printing plate are secured to them for the purpose of releasing and clamping the same, more particularly in conjunction with an inclination adjustment mechanism.
BACKGROUND OF THE INVENTION
Mechanisms of this kind are described more particularly in EP 232 730-A2. Pivotal levers are provided at the two axial ends of the cylinder gap for the inclination adjustment and are connected in an articulated manner to the edges of the printing plate, their pivot shafts fixed on the cylinder being disposed eccentrically with respect to the gap. To release or clamp the printing plate on the plate cylinder the clamping bars can be tilted about an axis-parallel axis.
However, it is not possible to obtain perfect inclination adjustment for resister correction with this known mechanism, because the pivot axes of the lever system are not situated in the center of the cylinder gap. Moreover, the mechanism described in the said patent for releasing and clamping the printing plate is of complicated construction because not only are pivot bearings necessary for the two clamping bars, but also care must be taken to ensure that the two clamping bars are pivoted in synchronism and opposite directions.
OBJECTS AND SUMMARY OF THE INVENTION
The present invention obviates foregoing disadvantages. The primary aim of the invention is to devise the mechanism such so that accurate adjustment of the inclination of the printing plate is possible with minimum complexity in terms of construction and with the minimum number of operations.
To solve this problem, the invention is characterised in that the two clamping bars are disposed on a common baseplate and displaceable relatively thereto, in that the lever system is mounted pivotally on the baseplate centrally between the two points of articulation of the lever system, in that the baseplate is mounted at one axial end to be pivotable in the tangential and radial directions with a substantially central arrangement of the pivot mounting with respect to the cylinder gap, and in that the baseplate is adjustable radially at the other axial end.
Since the components forming the inclination adjustment mechanism are disposed together with the clamping bars on a common baseplate, an appropriate pivoting movement of the baseplate enables the printing plate engaging the plate cylinder to be released so that it rests loosely on the periphery of the plate cylinder and can be displaced relatively thereto without difficulty. Displacement of the printing plate is by means of the lever system and the resulting inclination adjustment is very accurate, because the pivot point of the lever system--unlike the
REFERENCES:
patent: 3750571 (1973-08-01), Germann
patent: 4259904 (1981-04-01), Metje
patent: 4688484 (1987-08-01), Herold et al.
patent: 4809607 (1989-03-01), Dorow et al.
patent: 4977833 (1990-12-01), Inage et al.
Bennett G. Bradley
Cuchlinski Jr. William A.
MAN Roland Druckmaschinen AG
LandOfFree
Mechanism for adjusting the skew angle of inclination of a print does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mechanism for adjusting the skew angle of inclination of a print, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mechanism for adjusting the skew angle of inclination of a print will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-943586