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Патент USA US3088166

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May 7, 1963
E. R. LJUNGQUIST ETAL
3,088,156
SELF-EQUALIZING SUPPORT FOR DOCTOR BLADES
Filed April 26, 1962
2 Sheets-Sheet 1
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INVENTORS
ERNST R.LJUNGQUIST
ROGER E. BEDARD
ATTORNEY
May 7, 1963
E. R. LJUNGQUIST ETAI.
3,088,156
SELF-EQUALIZING SUPPORT FOR DOCTOR_BLADES
Filed April 26, 1962
2 Sheets-Sheet 2
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. INVENTORS
ERNST R. LJUNGQUIST
ROGER E. BEDARD
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ATTORNEY
Uited Stats
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3,088,156
Patented May 7, 1983
2
1
FIG. 3 is a top plan view, looking in the direction of
3,088,156
SELF-EQUALIZING SUPPORT FGR
DOCTOR BLADES
Ernst Roland Ljungquist, Worcester, and Roger Edgar
arrow -3 in FIG. 1;
FIG. 4 is an end view on an enlarged scale showing the
details of the slide assembly;
FIG. 5 is a side elevation, looking in the direction of
arrow 5 in FIG. 4 showing the slide assembly;
FIG' 6 is a top plan view, looking in the direction of
of Massachusetts
arrow 6 in FIG. 5, and
Filed Apr. 26, 1962, Ser. No. 190,494
FIG. 7 is a diagram of the hydropn'eumatic system.
12 Claims. (Cl. 15-25653)
Referring now to FIGS. 1, 2 and 3, there is there rep
10
resented the general framework ‘of the machine at 8 in
This invention relates to a means for mounting a doctor
cluding any kind of supporting means for longitudinal
blade so as to cause it to apply constant pressure to the
bars spaced from the floor. On these bars there is pro
surface which the doctor blade engages, and including a
vided a journal (not shown) but mounted on the stringers
mounting mechanism which is self-aligning with reference
to the doctor blade and the surface which is being acted 15 10‘ in position to journal a roll 112.
The ‘doctor blade itself is indicated at 16 and this is
upon, such as for instance a machine roll.
mounted more or less in the usual way on a blade holder
In carrying out the present invention, the blade is
Bedard, West Boylston, Mass., assignors to Lodding
Engineering Corporation, Auburn, Mass, a corporation
18. The blade holder 18 is in turn rigidly mounted on
the doctor back which is indicated generally at 2!}. This
trary to the usual construction, the back being mounted at
its ends upon slides guided by ways which extend gen 20 doctor back is prefer-ably made in the form of a relatively
large hollow tube which may be provided with welded par
erally at a right angle to the edge of the doctor blade and
titions or the like as at 22, 22 together with circular end
also at a right angle to the roll upon which the blade is to
plates 24.
operate, the slides being rectilinearly traveled in both
The partitions '22 and end plates 24 are centrally aper
directions by means of a piston and cylinder arrangement
utilizng the shop air at one side thereof to back off the 25 tured for the slide ?t reception of journals 26, 26, these
being the same at both ends of the doctor back sides of
blade away from the surface being doctored, in combina
the machine (see FIGS. 2 and 3) but of course providing
tion with a combined hydraulic and pneumatic system or
rights and lefts.
“hydropneumatic intensi?er” which is applied to the other
CF-ixedly mounted on the journals 26 are plates 28, 23,
end of the cylinder to move the doctor blade toward the
surface doctored, :the hydraulic ?uid of the intensi?er en 30 these being provided with a circular series of arcuate
shaped ‘slots 30‘ (see FIG. 1) receiving bolts 32 threaded
suring constant pressure at both ends of the doctor back
into the end plates 24- for holding the doctor back in angu
for applying constant pressure of the blade across the
l-arly adjusted position relative to journals 26.
roll, and also preventing unwanted reverse motions of the
Journals 26 are ?xedly mounted in blocks 34 which
slides under bumpy conditions, so that the hydropneu
matic intensi?er holds the blade in the desired position 35 have adjustment slots 35, there being a block at each end
of the doctor back, i.e., one for each journal 26, 26, these
with equal pressure at the ends of the blade and causes the
blocks being adjustably secured on slide plates 36, 36
blade to be self-aligning with relation to the roll operated
mounted upon a doctor back which is non-pivoting, con
upon, the pneumatic system and the hydropnuematic in
(see particularly FIGS. 4, 5 and 6) by bolts extending
through the slots 35. The slide plates are slidingly
tensi?er being coupled to a four-way valve so that it
is only necessary to throw the valve in one direction to 40 mounted in ways generally indicated at 38 and include
hold-down track members 46 bolted to the ways and
cause the doctor to retreat from the roll and in the other
providing for rectilinear sliding of the slide plates with
direction to cause the hydropneumatic intensi?er to bring
out variation in a vertical direction. However, the slide
the doctor back adjacent the roll or other surface, with
plates 36 are slightly narrower than the distance between
the blade bearing thereon.
Other objects of the invention include the provision of 45 the vertical slide guiding portions 42, 42 of the ways 38,
so that the slide plates 36 can move slightly from side
various improvements in the apparatus described above
including the fact that the slides comprise plates loosely
to-side during their rectilinear motion forward and back.
mounted in the ways so that the entire doctor back can
As the slide plates move, the blocks 34 move with them
. and therefore the doctor back and the doctor blade there
align and adjust itself under the hydropneumatic pres
sure; and also the ways guiding the slide plates are piv 50 on move rectilinearly back and forth relative to the sur
face to be doctored, i.e., the roll 12.
otally mounted so as to further accommodate the self
The means for moving the slide plates back and forth
alignment action of the device in a direction generally
consists of cylinders 44 which in this case are ?xed to the
normal to the travel of the plates, whereby the action is
respective slide plates to move, there being a ?xed piston
extremely smooth and no binding is possible.
55
in each cylinder as at 46. Each piston is mounted on a
rod 48. The rods 48 are conveniently held in ?xed po
binations of parts which will be hereinafter described and
sition relative to the ways by means of a pair of studs 59
more particularly set forth in the appended claims.
on the ways, the studs extending inwardly toward each
Reference is to be had to the accompanying drawings,
other and holding between them the rod end 52 which
in which
60 is in the form of an eye having a rod 54 passing through
FIG. 1 is a view in side elevation showing one end of
it, the rod 54 being located in the studs. The cylinder
the device;
construction can be of any general well known descrip
FIG. 2 is a View in rear elevation thereof, looking in the
tion, being provided at its ends with ports at 55, 56 for
The invention further relates to arrangements and com
direction of arrow 2 in FIG. 1, parts being in section;
the reception of the pneumatic and hydraulic lines to be
3,088,156
3
4
described. The ends of the cylinders opposite the rods
48 can be fastened to the respective slide plate 36 by any
back, a blade holder thereon and a doctor blade on the
which an end of the cylinder 44 is fastened. Thus it
will be seen that pressure entering the ?tting at 55 will
holder, a slide at each end of the doctor back, said slides
mounting the doctor back for rectilinear motion thereof
transverse to its length, means guiding the said slides in
generally parallel rectilinear paths, power means for mov
ing the slides, said power means comprising a cylinder
and piston for each slide, pneumatic means applied to
cause the cylinder and slide plate to move to the left in
FIG. 6 and pressure entering at 56 will cause the opposite
one end of each cylinder and hydraulic means to the oppo
site ends thereof for moving the doctor back in one direc
desired means such as ‘for instance brackets 58 secured
to the slide plate and depending therefrom, these brackets
being spaced and holding between them a rod 60 upon
motion.
10 tion under air pressure and in the opposite direction by
hydraulic pressure, the hydraulic means serving to move
The ways 38 include end plates 64, 64 which are aper
the doctor back and its blade toward the surface to be
tured and reamed at 66 to receive fore-and-aft studs 68
doctored.
appropriately mounted on a base member generally indi
2. A self-aligning doctor construction comprising an
cated at 70 as by end plates 72 thereon so that the ways
themselves including the slide plates 36, block 34, etc. 15 elongated doctor back, a blade holder and a blade there
are enabled to pivot slightly on the axis of the studs 68.
This action combined with the loose sliding action of the
plates 36 provides for automatic self-alignment of the
ends of the doctor back, regardless of the angularity of
on, a power cylinder at each end of the doctor back con
nected thereto for moving the same rectilinearly in a di
rection at right angles to the longitudinal extent of the
doctor blade, a journal at each end of the doctor back, a.
the roll or surface which is being operated upon with re 20 block in which each journal is mounted respectively at
each end of the doctor back, the respective cylinders each
spect to the edge of the doctor blade. The base 70 is
being secured to a block, and means for applying pressure
appropriately mounted on the frame 10 of the machine.
at either end of each cylinder.
The ports at 55 and 56 are provided with ?ttings such
3. The apparatus as recited in claim 2 wherein the
as are shown for instance in FIG. 2 at 74, 74, and these
are connected by hoses to a source of air connected di 25 pressure applied to one end of the cylinder is pneumatic
and at the other end of the cylinder being hydraulic, the
rectly to port 56 and a source of hydraulic ?uid connected
hydarulic means serving to move the doctor with the
to the port 55. The pressure of the hydraulic ?uid is
blade toward the surface to be doctored.
intensi?ed by the pressure of the air (see the diagram
4. A self-aligning doctor blade construction compris
FIG. 7). There is a source of shop air indicated by
the reference numeral 76 and this leads to a four-way 30 ing an elongated doctor back, a doctor blade holder
thereon, a journal at each end of the doctor back, a block
valve of general conventional construction 78. The air
for each journal, a slide plate mounting each block, ways
then goes through the conduit 80 through the respective
for the slide plates, a pneumatic cylinder connected to
?ttings 56, 56 and when the handle 82 of the four-way
each slide plate, means for applying pressure to either end
valve 78 is in one position, air will enter the ports at
56 causing the cylinders 44 to retract, i.e., to the left in 35 of each pneumatic cylinder to move the slide plates,
blocks, journals, etc., rectilinearly in a direction at right
FIGS. 1 and 7 (but to the right in FIG. 6), bringing the
angles to the general axis of the doctor back.
doctor back with it and releasing the blade from the
5. The apparatus as recited in claim 4 including means
roll 12.
Shop air is also connected through a regulator 84 40 guiding the slide plates loosely to provide a lateral leeway
for the slide plates so that they can move laterally trans
through a conduit 86 to a hydropneumatic intensi?er gen
versely of the direction of reciprocation thereof.
erally indicated at 88. This is a device that receives the
6. The apparatus as recited in claim 4 including ways
shop air under regulated pressure and applies pressure
for the slide plates and means mounting the ways for a
on hydraulic ?uid at 90 in a cylinder by means of a di
slight angular adjustment about an axis parallel to the
aphragm or piston-like member 92, and the hydraulic
fluid then passes through conduit 94 to the ports 55. 45 reciprocal motion of the slide plates.
7. The apparatus as recited in claim 4 including ways
This causes the cylinders 44 to move to the right in FIGS.
for the slide plates and means mounting therways for a
v1 and 7, applying the blade to the roll under equal pres
slight angular adjustment about an axis parallel to the
sure at both ends of the doctor back by means of the
reciprocal motion of the slide plates, a base for each of
hydraulic fluid which is not subject to compression with
in the cylinder and therefore will not permit ?utter in 50 the ways, studs on each base, said ways being mounted
on the base by means of said studs.
the blade due to operating conditions which would other
8. A doctor construction comprising an elongated doc
wise be the case if air were used directly at both sides of
tor back, a blade holder and a blade on the doctor back,
the piston and the cylinders 44. Thus it is only neces
sary to move the valve handle 82 from the position shown 55 a journal at each end of the doctor back, means support
ing the journals at each end of the doctor back, a sliding
in solid lines in FIG. 7 to the position shown in dotted
plate mounting each said journal supporting means, means
lines in order to reverse the action of the cylinders as
for moving said plates simultaneously in the same direc
described.
tion, means guiding the plates, the means for moving the
The journals 26 are angularly fixed with relation to
Plates 28 are ?xed to the re 60 plates comprising a combined pneumatic and hydraulic
cylinder, and a combined pneumatic and hydraulic pres
spective journals 26 and the bolts 32 extend into threaded
the blocks 34 as by a key.
holes in the plates 24 ?xed to the ends of the doctor
back, so that if it is desired ‘to change the angle of the
blade holder 18 with respect to the roll surface, it is only
sure source for said cylinder, the hydraulic ?uid entering
at one end of the cylinder only and the pneumatic means
entering at the other end of the cylinder only so as to
move the entire doctor back assembly in an operative di
necessary to loosen the bolts at 32 and rotate the entire 65
rection by means of hydraulic ?uid and in a reverse direc~
doctor back with relation to the slot or plate 28. If this
tion by means of air pressure.
is done, however, it may be necessary to also adjust the
9. The doctor construction as recited in claim 8 includ
longitudinal position of the block 34 with respect to its
ing a hydropneumatic intensi?er, the pneumatic pressure
slide plate 36 by means of the bolts which extend through
the elongated slots 35.
70 source being connected to said intensi?er for operating
herein disclosed, otherwise than as set forth in the claims,
the same to increase and decrease the hydraulic pressure
at the one side of the cylinder, and a valve for connecting
the pneumatic pressure source alone to the opposite side
but what we claim is:
of the cylinder.
Having thus described our invention and the advan
tages thereof, we do not wish to be limited to the details
1. A doctor support comprising an elongated doctor 75
10. The doctor construction of claim 8 including means
3,088,156
6
5
tive ends thereof, said last-named means providing for
angular adjustment of the doctor back about its longi
tudinal axis relative to the journal plates, and means to
nals, and means holding the journals against rotative
adjust the journals in a direction parallel to the rectilinear
motion.
11. The doctor construction of claim 8 including a 5 motion of the sliding plates.
on the journals securing the doctor back thereto, means
to angularly adjust the doctor back relative to the jour
transverse plate ?xed to each journal, means on each
journal plate to secure the doctor back thereto at the
respective ends thereof, said last-named means provid
ing for angular adjustment of the doctor back about its
longitudinal axis relative to the journal plates.
12. The doctor construction of claim 8 including a
transverse plate ?xed to each journal, means on each jour
nal plate to secure the doctor back thereto at the respec
References Cited in the ?le of this patent
UNITED STATES PATENTS
10
1,812,920
3,026,796
Ballard ______________ _. July 7, 1931
Crawford ___________ __ Mar. 27, 1962
328,826
Switzerland _________ __ May 14, 1958
FOREIGN PATENTS
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