Printing – Inkers – Roller
Patent
1999-09-23
2000-06-20
Hilten, John S.
Printing
Inkers
Roller
101363, 101DIG34, B41F 3102, B41F 3104
Patent
active
060764627
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an ink unit for a rotary printing press.
A device for inking a screen roller is known from EP 0 663 293 A1, wherein ink rotates in a filled ink duct of circular cross section around an axis extending longitudinally in respect to the screen roller,
A negatively applied working doctor blade and a positively applied finishing doctor blade are provided.
A pre-shaped ink duct is required, into which ink is pumped.
U.S. Pat. No. 1,568,299 A1 describes an ink duct with two ink blades, which are spaced apart from each other in the circumferential direction of a metering roller. A thickness of an ink layer to be transferred is determined by means of an adjustable distance of the ink blades from the metering roller.
U.S. Pat. No. 3,730,089 shows an ink duct, in which an ink roll forms in the course of operation. An ink blade is spaced apart from a metering roller for metering the ink.
SUMMARY OF THE INVENTION
The object of the present invention is based on providing an inking unit for a rotary printing press for inking a screen roller with highly viscous ink.
In accordance with the invention, this object is attained by using an unpressurized ink duct having a negatively applied working doctor blade, and a positively applied finishing doctor blade. During operation of the printing press a rotating ink roll of the highly viscous ink is formed. This rotating ink roll rolls off the working doctor blade without touching the finishing doctor blade.
The advantages which can be achieved by means of the present invention lie, in particular, in that little ink is circulating, which is of advantage when cleaning the ink duct and when changing ink. Because of the absence of a specially shaped ink duct, the rotating ink roll is located undisturbed and evenly, which also leads to even and intensive inking of the cylinder.
BRIEF DESCRIPTION OF THE DRAWING
A preferred embodiment of the present invention is represented in the sole drawing figure and will be described in greater detail in what follows, The single drawing represents a cross section through a schematic representation of an ink duct with two doctor blades, which is placed on a cylinder.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An ink duct 1, open at the top, has a left lateral wall 2 and a right lateral wall 3, as well as two sealing end walls 6, 7, matched to the periphery I I of a driven cylinder 4. The ink duct 1 extends over the entire length of the cylinder 4 which can be embodied as a screen roller. A working doctor blade 8, which is negatively applied to the cylinder 4, as well as a finishing doctor blade 9 are exchangeably applied at the bottom of the lateral walls 2, 3.
Highly viscous ink is present in the ink duct I which, during the operation of the press, forms an ink roll 12, which is movable in the horizontal direction A and rotates in a clockwise direction B. Corresponding to the direction of rotation of the cylinder 4, for example in a counterclockwise direction C, the ink roll 12 rests against a portion of the peripheral surface 11 of the cylinder 4, as well as on a working surface 13 of the working doctor blade 8, as well as on a guide surface 14, which delimits the ink roll 12 in the production direction C of the cylinder 4.
The guide surface 14 is formed, for example, by the inside surface of the left lateral wall 2 and extends at an obtuse angle .varies., preferably of 110.degree. to 130.degree., with respect to the working surface 13 of the working doctor blade 8.
The working surface 13 of the working doctor blade 8 is formed by the free doctor blade width, as well as the length of the working doctor blade 8.
It is also possible to let the cylinder 4 run in a clockwise direction, so that the doctor blade 9 becomes the working doctor blade and the doctor blade 8 becomes the finishing doctor blade. The ink roll 12 now rests against the doctor blade 9, as well as on the inner surface of the right lateral wall 3, which inner surface forms a guide surface 16.
The ink duct 1 is arranged, at
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Schafer Karl Robert
Schneider Georg
Grohusky Leslie J.
Hilten John S.
Koenig & Bauer Aktiengesellschaft
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