Printing – Inkers – Roller
Patent
1998-01-12
1999-07-27
Fisher, J. Reed
Printing
Inkers
Roller
101366, B41F 3104, B41F 3108
Patent
active
059271990
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a doctor blade arrangement for a rinse inking unit of a rotary printing machine consisting of a doctor blade carrier formed by a profile strip with a groove type recess. Two doctor blades adjustable at an inking or raster roller are fixed on the doctor blade carrier almost like a roof and parallel to each other. The doctor blades together with the inking roller, the groove type recess of the doctor blade carrier and sealing materials provided for the same at the end side define a dye chamber. The rotary printing machine contains also tubes for feeding and discharging dye into the dye chamber and out of the same, respectively, and adjusting devices for pressing the doctor blade carrier against the inking roller.
In the case of the doctor blade arrangements of this type known from, for example, DE 40 01 733 A1 and DE 40 01 734 A1, the problem remains that, on the one hand, the dye introduction into the dye chamber should remain under certain pressure and, on the other hand, the sealing material at the side should prevent a leakage of dye from the dye chamber, so that the doctor blade arrangement is not stained by the outcoming dye and no solvent can evaporate from the dye.
The task of the present invention is therefore to design a doctor blade arrangement as stated at the outset, wherein the sealing materials provided at the end side of the doctor blade carrier assure a good sealing of the dye chamber against the outcoming dye.
According to this invention this task is solved in the case of a doctor blade arrangement of the generic type by the fact that the groove type recess is provided with a central middle part preferably extending up to its end regions and forming a main chamber, and, at the end sides, with side parts forming secondary chambers which are connected with the main chamber through throttle gaps, that the tube feeding the dye leads into the main chamber, and that the side parts are connected with the tubes discharging the dye and are provided with exhaust holes.
In the case of the doctor blade arrangement according to the invention, the desired excess pressure in the dye is maintained by passing the dye into the main chamber of the dye chamber. From the main chamber the dye enters into the depressurized secondary chamber through the throttle gaps, so that the sealings provided at the end side of the doctor blade carrier can seal the dye chamber well from the side, as sealings are not charged by dye, which is under pressure.
Advantageously, the main chamber and the secondary chambers are separated from each other by radial partition walls of the groove type recess, the edges of which are bent in the shape of an arc and, together with the raster roller, border the throttle gaps. The partition walls can be formed by rib type raisings. Furthermore the partition walls can pass over to the main chamber through the bent wall parts. Advantageously, the outer sides of the partition walls lie on radial planes.
In another design of this invention it is provided that at least one side of each of the partition walls is provided with a coating of synthetic material. Said side rises over the edges of the partition walls and with that borders the throttle gaps at the doctor blade side.
The secondary chambers can have an L-shaped cross-section in the longitudinal section of the doctor blade carrier. Advantageously, a space formed by an L-shaped part of the secondary chambers stretches in each case till below the main chamber.
The doctor blades are subject to an unavoidable abrasion, so that with their increasing erosion the radial partition walls with their edges bent in the shape of an arc and the edges bordering the throttle gaps approach towards the raster roller and the width of the throttle gaps decreases in an unwanted way.
To prevent that with increasing abrasion of the doctor blades the throttle gaps between the partition walls and the inking roller becomes smaller, according to an innovative further construction, it is provided that the partition walls bordering the throttle
REFERENCES:
patent: 4581995 (1986-04-01), Stone
patent: 5406887 (1995-04-01), Hertel et al.
Achelpohl Fritz
Rogge Gunter
Fisher J. Reed
Windmoller & Holscher
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