This invention relates to a doctor blade device for a rinse
inking unit of a rotary printing machine consisting of a doctor
blade carrier formed by a profile border 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 border 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 device of this type known
from, for example, DE-40 01 733 Al and DE-40 01 734 the problem
remains, that the dye introduction into the dye chamber should
remain under certain pressure on the one hand and the sealing
material at the side should prevent a leakage of dye from the
dye chamber on the other, so that the doctor blade device
is not strained 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 device as stated in outset. Here the sealing
materials provided at the 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 device of the type as described by the
fact that the groove type recess is provided with an average,
preferably stretching upto its end region, middle part forming
a main chamber and at the end side parts forming secondary
chambers, which are connected with the main chamber through
throstle gap, that the tube feeding the dye mouths 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 device the desired
excess pressure in the dye can 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 throstle gap, so that the sealings provided at the
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.
Usually 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 with the raster roller border the throstle gap. 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. Usefully 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. The side rises over the
edges of the partition walls and with that borders the throstle
gap at the doctor blade side.
The secondary chambers can have an L-shpaed cross section
in the longitudinal section of the doctor blade carrier. Usefully
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 throstle gap approach towards the raster roller
and the width of the throstle gap decreases in an unwanted way.
To prevent that with increasing abrasion of the doctor
blades the throstle gap between the partition walls and the
inking roller becomes smaller, according to an innovative further
construction for which automatic protection is claimed, it is
provided that the partition walls bordering the throstle gap

are guided in the radial direction to the inking roller movable
in the profile strip and are joined with the inking unit frame
carrying the doctor blade device essentially immovable
by holding devices. Thus in the case of an abrasion of the doctor
blades the width of the throstle gap remains essentially
constant. According to this innovative construction it is thus
provided that the partition walls bordering the throstle gap
are kept imovable relative to the inking unit frame, so that
those do not respond to the approach of the profile strip
resulting from the abrasion of the doctor blades towards the
raster roller. In this way it is guaranteed that the width of
the throstle gap between the edges of the partition wall and
the raster roller remains constant. The edges of the partition
walls are bent in the shape of an arc.
The essentially rigid joint of the partition walls with
the inking unit frame carrying the doctor blade device can
be effected by different means. According to one operation form
it is provided, that the partition walls are joined by springy
tabs or webs with the profile strip, so that they can turn
backwards in a springy way corresponding to the increasing
abrasion of the doctor blade.
The partition walls can be supported in each case by bars
on a stopper of the dye unit box.

The bars can be pushed away from the profile strip through
special holes or openings.It is of course useful to push away
the bars from the profile strip through the exhaust holes.
These holes are always there, so that no special openings or
passages have to be provided for the bars.
Usefully the stopper can be adjusted by an adjustment
device, so that there is an additional possibility to adjust
the width of the throstle gap.
Examples of operation of this invention are explained in
more details afterward with the help of the accompanying drawing.
It is shown in
Fig. 1 a side view of the dye unit frame with dye chamber
doctor blade sectioned along the line I-I in Fig. 2,
Fig. 2 a section through the doctor blade carrier along
the line II-II in Fig. 1,
Fig. 3 a view of the dye chamber doctor blade in the
direction of the arrow A in Fig. 2,
Fig. 4 a side view of the dye unit frame corresponding
to the Fig. 1 with sectioned dye chamber doctor blade, where
the partition walls bordering the throstle gap are kept non-
shiftable relative to the dye unit frame, and
Fig. 5 a section through the doctor blade carrier
corresponding to the Fig. 2 along the line V-V in Fig. 4.

In the dye unit frame 1 , which is lodged shiftable in the
usual way on the printing cylinder frame constructed also as
slides, one side of the inking or raster roller 2 is lodged
in the usual way and hence not described in more details.
The parallel guide rods 5, 6 are lodged in a swivable way
at the dye unit frame 1 around the articulted axles 3, 4. The
upper ends of the parallel guide rods 5, 6 are joined with the
carrier 9 forming a coupler swivable around the articulated

axis 7, 8. The carrier 9 is constructed as single piece which
is joined by screws provided with

hand wheels. 10 with the doctor blade holder 11.

The piston rod 12 of a pneumatic cylinder 13 is joined
flexibly with the upper ends of the parallel guide rods 6 or
with the carrier 9 in the articulated axle 8. The cylinder again
is linked at the dye unit frame 1 over a carrier piece 14 by
the link 15.
While setting the doctor blades at the raster roller and
while moving off the coupler and doctor blade carrier 11 remain
parallel to themselves, because the parallel guide rods 5, 6
have the same lengths and maintain their parallel property during
their swings.
The articulated axles 4 of the parallel guide rods are
provided with an eccentric adjustment 4', on the basis of which
the swivelling axis of the parallel guide rod 6 can be lifted
or sunk down.

The parallel guide rods 5, 6 of each dye unit frame of
the two bearing the raster roller 2 can be designed to increase
the stability doubly.
The doctor blade carrier 11 consists of a profile strip,
the profile of which is evident from Fig. 1 . The strip of the
doctor blade carrier 1 is provided with a groove 20 forming
the inside space of the main or dye chamber. In this groove

pipe line as bore hole 21 feeding the printing ink meets in the lower middle
area, as it is evident fro the Fig. 3. In the lower end regions

the groove is cut by the pipe line as bore holes 22,23 discharging the
printing ink. The exhaust holes 24, 2 5 meet at the upper end
region of the groove.
The front sides 26, 27 of the edges of the grooves are
inclined in the opposite directions like a roof. The doctor
blades 30, 31 are fixed on these front areas, 26, 27 by clamp
holders 28, 29 in the usual way and hence not described in more
details.
At the sides of the doctor blade holder 11 the sealings
33, 34 are arranged, which seal the inside space of the main
or dye chamber 20 against the raster roller 2. To hold these
sealings covers 35, 36 are screwed with the side of the front
areas of the strip of the doctor blade carrier.

The inside space of the dye chamber is provided at its
sides with secondary chambers 38, 39 having L-shapes in cross
section, These chambers are aeparated from the central part of
the inside space of the dye chamber by partition walls 40, 41,
the edges of which directing against the raster roller 2 border
the throttle gap 42, 43 bent in the shape of an arc.Starting
from the edges 42, 43 the bent wall parts 44, 45 pass over into
the central main part of the inside space of the dye chamber.The
side or secondary chambers 38, 39 are connected with the central part of
the inside space of the dye chamber through the throttling gap
42, 43. The wall parts 40, 41 thus from the so called weirs,
through which the dye passed into the central part of the inside
space of the dye chamber through the feed hole 21 enters under
decrease of pressure into the depressurized side chambers 38,
39. The exhaust holes 24, 25 mouth into these.
The outer sides of the walls 40, 41 are provided with
coatings 48, 49 of synthetic material, which rise slightly above
the edges bordering the gap 42, 43, so that any metallic contact
of the edges with the raster roller 2 is made impossible.
In the case of the example of operation according to the
Figs. 4 and 5 the partition walls, 50, 51 are screwed through
springy spacing materials 52, 53 with the base 54 of the main
chamber raised compared to the secondary chambers 38, 39 at

the sides. The screwings are indicated by the dotted lines 55.
The springy spacing materials 52 are fitted into the
corresponding steplike routings of the base 54. Moreover recesses
56 set in the shape of steps are provided between the screwed
end regions of the springy spacing materials 52, 53 and the
base, in order to permit the partition walls 50, 51 a
sufficiently wide backward cushioning. Blind holes 57 are
arranged in the backwalls of the base bordering the recesses
56 having the shape of steps, whereby pressure springs 58 are
fixed between the grounds of these blind holes and the backside
of the springy spacing materials 52, 53.

Holding pieces devices 60 are screwed with the front side of the
partition walls 50, 51 confining the secondary chambers. The
one ends of essentially rigid bars 61 are fixed in the holding
pieces in the way as evident from the Fig. 4. The other ends
rest on an adjusting screw 62, which is screwed into a console
63 rigidly joined with the dye unit frame. The bars 61 fixing
the partition walls 50, 51 relative to the dye unit frame 1 pass
through the already provided exhaust holes 24, 25.

WE CLAIM:
1. A doctor blade device for a rinse inking unit of a rotary
printing machine, said doctor blade device comprising:
a doctor blade carrier (11) formed by a profile strip
with a groove shaped recess;
two doctor blades ( 30,31) adjustable at an inking or
raster roller (2) being fixed on said doctor blade carrier
parallel to each other, said doctor blades together with said
inking roller, the groove shaped recess of the doctor blade
carrier and sealing materials ( 33, 34) provided at each of
two end sides define a dye chamber (20),
bore holes (21, 22, 23) to feed and discharge dye into
the dye chamber and out of the dye chamber, and
adjusting device (4') to press the doctor blade carrier
against the inking roller (2) characteried in that
the yroove (20) shaped recess being provided with a
central middle part extending up to its end regions and forming
a main chamber and, at the end sides, with side parts forming
secondary chambers ( 38, 39), said side parts being connected
with the main chamber through throttle gap ( 42, 43) for
maintaining pressure in the dye and allowing the dye to enter
into the depressurized secondary chambers ( 38, 39) through
the throttle gaps ( 42,43).

a pipe connected to the bore hole (21) feeding the dye
leading into the main chamber and
the side parts for secondary chamber (38, 39) being provided
with pipe lines connected to the bore holes (22,23) discharging
the dye through the exhaust holes (24,25).
2. The doctor blade device as claimed in claim 1 wherein
the main chamber and the secondary chambers ( 38, 39) are
separated from each other by radial partition walls (40,41)
the edges of which directing against the raster roller (2),
border the throttle gap (42,43) and bent in the shape of an
arc.
3. The doctor blade device as claimed in claim 1 or 2 wherein
the outer side of the partition walls (40,41) are provided with
coatings (48,49) which rise slightly above the edges borderning
the gap (42,43)
4. The doctor blade device as claimed in any one of the
claims 1 to 3 wherein the partition walls (40,41) pass over
through bent wall parts (44,45) into the main chamber.
5. The doctor blade device as claimed in any one of the
claims 1 to 4 wherein the outer sides of the partition walls
(40,41) lie on radial planes.

6. The doctor blade device as claimd in any one of claims
1 to 5, wherein at least one side of each of the partition walls
(40,41) is provided with a coating (48,49) of synthetic material,
as herein described which rises above the edges of the partition
walls and borders the throttle gap (42,43) at the doctor blade
side.
7. The doctor blade device as claimed in anyone of the claims
1 to 6, wherein the secondary chambers (38,39) have an L-shaped
cross section in the longitudinal section of the doctor blade
carrier (11).
8. The doctor blade device as claimed in claim 7, wherein
a space formed in each case by an L-shaped cross-section of
the secondary chambers (38,39) stretches until reaching below
the main chamber.
9. The doctor blade device as claimed in any one of the
claims 1 to 8 wherein the partition walls (50,51) bordering
the throttle gap are guided in the radial direction to the inking
roller (2) movable in the profile strip and are joined over
the holding devices (60) immovable with the dye unit frame (1)
carrying the doctor blade device, so that in the case of an
abrasion of the doctor blades the width of the throttle gap
remains constant.

10. The doctor blade device as claimed in claim 9 wherein
the partition walls (50,51) are joined with the profile strip
by springy spacing materials (52,53)
11. The doctor blade device as claimed in claim 9 or 10
wherein the partition walls (50,51) are each supported on a
stopper of the dye unit frame (1) over a bar (61).
12. The doctor blade device as claimed in claim 11 , wherein

rigid bars (61) are projected out of the profile strip through
the exhaust holes (24,25).
13. The doctor blade device as claimed in claim 11 wherein
the stopper is adjustable by an adjusting device (62,63).

ABSTRACT
The invention relates to a doctor blade device for a rinse
inking unit of a rotary printing machine consists of a doctor
blade carrier formed by a profile strip with a groove type
recess. Two doctor blades adjustable at an inking roller are
fixed on the doctor blade carrier almost like a roof and parallel
to each other. The two doctor blades together with the inking
roller the groove type recess of the doctor blade carrier and
sealings materials provided for the same at the end side border
a dye chamber. In order to assure a good sealing of the dye
chamber against the outcoming dye , the groove type recess is
provided with a central middle part forming a main chamber and
end-side side parts forming secondary chambers, which are
connected with the main chamber through throttle gaps. The tube
feeding the dye leads into the main chamber. The side parts
are provided with the pipe lines discharging the dye and with
the exhaust holes.