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Патент USA US3035523

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May 22, 1962
Filed May 19, 1958
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Edward D. Beach [er
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Filed May 19, 1958
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Filed May 19, 1958
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May 22, 1962
Filed May' 19, 1958
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Edward D. Beach/er
May 22, 1962
Filed May 19, 1958
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United States Patent Office
Patented May 22, 1962
volving the use of laterally spaced pairs ‘of opposed
rollers for backing a nip-de?ning roll. Each of such pairs
of opposed rollers is resiliently urged against the back
Edward D. Beachler, Beloit, Wis., assignor, by mesne as
of one of the nip-de?ning rolls. The resilient means thus
act through the associated pair of rollers to load one nip
de?ning roll directly against the other and no means are
provided for maintaining a desired space between the
signments, to Clupak, Inc., New York, N.Y., a corpo
ration of Delaware
Filed May 19, 1958, Ser. No. 736,161
3 Claims. (Cl. 100-160)
nip-de?ning rolls. It will be appreciated that, the in
The instant invention relates to apparatus for applying
stant invention provides an arrangement whereby spac
pressure to a traveling ?exible element, and more par 10 ing between the nip-de?ning surfaces may be maintained
to a predetermined extent independently of the actual
ticularly, to a controlled ?exible nip loading arrange
loading pressure applied. In this way, the desired spac
The application of pressure to a traveling ?exible ele
ing may be maintained across the full lateral dimension
of the nip, even though hydraulic forces or the like in
ment passing between opposed nip-de?ning surfaces (such
as may be presented by opposed pressure rolls) is em 15 the ?exible element passing through the nip may resist
ployed in a number of arts. For example, nip-de?ning
nip loading to a greater extent, for example, in the cen
tral portion of the nip than at the edges. Irregularities
pressure rolls are used to squeeze moisture from textiles
in forces resisting nip loading within the traveling ?exible
or paper traveling therebetween; and in such arrange
ments control is provided essentially for the actual load
element may also be created by varying the actual spac
ing pressure at the nip. In the case of “doctor” nips in 20 ing of the nip across the lateral dimension thereof. The
instant invention also provides for such variation in the
coating devices for textiles or paper, the loading pres
actual spacing across the lateral dimension of the nip
sure is controlled and also the space between the nip
and the use of nip loading pressures in conjunction with
de?ning surfaces involved must be controlled. Such
such spacing to maintain the predetermined spacing across
space must be sui?cient to permit not only the fabric but
a layer of coating thereon to pass through the nip. Con 2 Ul the width of the nip in spite of irregularities or differences
in the forces within the traveling ?exible element which
trol of this space merely by control of the actual load
ing pressure is often inadequate.
Although the instant invention may have application
in any of the nip loading arrangements hereinbefore
contemplated, it is particularly useful in connection with 30
the art of making extensible paper and it will be de
scribed primarily in connection therewith. In the art
of making extensible paper there has just been developed
resist nip loading.
The instant invention provides for laterally spaced
members engaging one of a pair of nip-de?ning means
for nip loading purposes. Such members are each pro
vided with independent ?uid pressure actuated means for
applying the loading force and adjustable stop means
for maintaining the desired spacing at the nip. In addi
tion, such members are pivotally mounted to permit
limited movement toward and away from the nip and
limited tilting movement along an axis extending longi
of a heated roll. At approximately the point at which
tudinally in the direction of travel of the traveling ?exi
the paper web covered by the blanket engages the heated
ble element passing through the nip. Such tilting move
roll, a backing member de?nes a press nip with the
ment provides for better alignment between the indi
heated roll so as to squeeze the rubber blanket in a pre
determined manner. During the remainder of its travel
vidual spaced members and the nip-de?ning roll backed
40 thereby.
over the speci?ed peripheral area of the heated roll, the
squeezed rubber blanket returns to its original size and
It is, therefore, an important object of the instant
shape with the result that the portion of the paper Web
invention to provide an improved nip loading arrange
an arrangement wherein a resilient blanket is urged
against a paper web over an extensive peripheral area
covered thereby on the previously selected peripheral
area of the roll is subjected to longitudinal compacting 45
It is another important object of the instant inven
or compression. The instant invention is concerned pri
tion to provide apparatus comprising a pair of means
marily with the nip loading arrangement for such back
presenting opposed nip-de?ning surfaces for pressing a
traveling ?exible element passing therethrough, laterally
ing roll which permits a rather substantial amount of
space between the backing roll and the heated roll sur
spaced members engaging one of said pair of means, ?uid
face so that an appreciable thickness of the rubber blanket
pressure actuated means acting on each of said mem
may pass through the nip. On the other hand, the in
bers to urge said one of said pair of means toward
stant nip loading arrangement permits the application
the other, and separate adjustable stops operatively con
of substantial pressure to the blanket at the nip.
nected with each of said ?uid pressure actuated means
to limit the movement of said one of said pair of means
toward the other.
In the instant device, and in a number of other nip
loading arrangements, it has been found desirable to
employ a backing roll (as one of the two nip-de?ning 55
Other and further objects, features and advantages of
rolls) of relatively small diameter. This results in the
the present invention will become apparent to those skilled
formation of a nip having a minimum peripheral dimen
in the art from the following detailed disclosure thereof
sion. Such a nip more accurately applies the precise
and the drawings attached hereto and made a part hereof.
loading pressure desired. The use of a roll of relatively
On the drawings:
small diameter, however, results in a tendency for this
FIGURE 1 is essentially a diagrammatic side elevation
roll to bend generally in the plane in which the nip
al view of an extensible paper making apparatus including
loading pressure is applied (i.e., the plane containing the
axes of both the nip-de?ning rolls). Also, nips of this
the nip loading arrangement of the instant invention;
FIGURE 2 is a fragmentary essentially diagrammatic
type have an extensive lateral dimension (laterally with
front elevational view taken from the right hand side of
respect to the direction of travel of the ?exible element
passing through the nip), so that liquids such as‘ mois~
ture or lubricants employed may actually develop by
hydraulic forces in the central portion of the nip so that
much greater loading pressure is required to maintain a
FIGURE 3 is a detail sectional elevational view of a
nip loading arrangement embodying the instant invention;
FIGURE 4 is a front elevational view taken from the
70 right hand side of FIGURE 3;
FIGURE 5 is a sectional elevational view taken sub
In Canadian Patent No. 546,471, issued to Appen
predetermined space between the nip-de?ning rolls.
zeller, there is described a nip loading arrangement in
stantially along the line V--V of FIGURE 3;
FIGURE 6 is a detail sectional elevational view show
ing the mounting of the centering pin (shown in full eleva
tional view) in FIGURES 3 and 4;
FIGURE 7 is a side elevational view of another nip
loading arrangement embodying the instant invention; and
FIGURE 8 is a detail elevational view of one of the
nip-de?ning members of the embodiment of FIGURE 7,
showing the same partially in full elevation and partially
in section.
As shown on the drawings:
In FIGURES l and 2 there is shown diagrammatically
a device, indicated generally by the reference numeral 10,
a sleeve 104 by lock nuts 105 and ‘106 and the sleeve 104
is mounted on a frame element 107 suitably secured to
bearing housings 108a and 10901 formed in an arm 110.
As will be noted’from FIGURE 4, opposed bearing
housings 1109a and 109cc’ rotatably mount a backing roller
v109 which engages the back side of the press roll.101.
Directly behind the bearing housings 109a and 109a’ in
the position of FIGURE'4 there are opposed bearing
housings for a second roller 108; and the position of the
10 roller 108 and one of the bearing housings 108a is shown
in FIGURE 3. The bearing housings 108a and 109a are
formed in one arm 110 and the opposite bearing housings
are formed in a second arm generally symmetrical in con
for making extensible paper. The device 10 comprises a
?guration to the arm v110 shown only partially at 110' in
resilient endless rubber blanket 11 mounted on guide rolls
12, 13, 14, 15 and 16. The rubber blanket '11 passes 15 FIGURE 4. The arm 110' does not have a frame ele—
ment 107 and centering pin 103 mounting, but such a
through a nip N-1 de?ned by a ?rst cylinder 17 rotatably
mounting is provided at the opposite end of the press roll
mounted on, hearing means 17:: and a second cylinder 18
1101. This general position of the centering pins is in
mounted on ?xed bearings 18a. The blanket 11 is held
dicated diagrammatically in FIGURE 2, wherein it will
against the second cylinder or roll 18 over a substantial
peripheral area 18b extending from the ?rst cylinder or
be noted that centering pins P and P’ are connected to
nip roll 17 to a second roll 15; and a paper web W is
opposite bearing housings 17a, 17a for the top roll 17.
Referring to FIGURE 6, it will be noted that the center
guided into contact with the surface of the roll 18 just
ing pin 103 is received by the sleeve 104 mounted on the
before the nip N-l and is held against the surface of the
frame element 167, but a resilient elastomer sleeve 111
roll 18 until the rubber blanket turns around the guide
roll 15. The rubber blanket 11 is squeezed or compressed 25 is interposed between the frame sleeve 104 and the
centering pin 103 so as to permit relatively slight tilting
at the nip N-l and it gradually returns to its normal size
movement of the pin 103 in the sleeve 104. Also, an
and shape as it passes over the peripheral area 18b to
elastomer washer 112 is clamped against the frame sleeve
ward the guide roll 15. The main press roll 18 is heated
104 by a metal washer 113 held in place by the top lock
and the moisture in the paper Web W subjected to the
heat from the roll 18 a?ords some lubrication so that the 30 nut 105; and another elastomer washer 114 is clamped
against the bottom of the frame sleeve 104 by a metal
web W is longitudinally compressed as it passes over the
Washer 1115 held in position by the lower lock nut 106.
peripheral roll area 1812.
The washers 112 and 114 as'well as the elastomer sleeve
A plurality of members 20, 21, 22, 23 and 24 (FIG
111 are formed of relatively hard rubber so that they
URE 2) are spaced across the width of the nip N-l. As
indicated in FIGURE 1, the ?rst member 20 comprises 35 yieldingly hold the centering pin 103 in position, but they
do permit a relatively limited amount of tilting movement
a pair of opposed rollers 20a and 2% which engage the
of the pin 103 (with only a negligible amount of relative
back side of the cylinder 17. The same is true of the
axial movement between the pin 103 and the frame sleeve
members 21, 22, 23- and 24. The bearings of the rollers
104). The purpose of this mounting for the pin 133 is to
20a and 20b are carried by an arm 20c connected to a
?xed pivot 20d at one end thereof, for swinging the rollers 40 permit slight shifting of the bearing housing 102 ‘and thus
the roll 101 relative to the backing rollers ‘10S and 109
20a and 20b about an axis aligned with the pivot 20d '
during the relatively slight movement ‘of the arm 110.
and parallel to the line of the nip N—1. At‘the opposite
As will be appreciated, the arm 110 is moved slightly so
end of the arm 200 there is a pivot 20c movable with the
as to adjust the space S between the rolls 101 and ‘100
arm 200. As shown in FIGURE 2, each of such pivots
Me, 212, 22c, etc. is connected to a yoke 30, 31, 32, 33 45 and the movement of the arm 110 will be described in
detail hereinafter. This slight movement of the ‘arm 110,
and 34, respectively. A separate ?uid actuated means 40,
however, tends to change slightly the alignment of forces
41, 42, etc. is connected to each of said yokes 30, 31, 32,
between the backing rolls 10S and 109 and the press roll
by means of pivots 50, 511, 52, etc. so as to permit limited
101 and the resilient mounting for the centering pin 103
relative tilting movement between the ?uid pressure actu
compensates automatically for the slight shifting in the
ated means or diaphragms 40, 41, 42, etc. and the yokes
position of the roll ‘101 relative to the positions of the
30, 31, 32, etc. about an axis aligned with the pivots 50,
rolls 108 and 109. It will be appreciated that the center
51, 52, etc. and longitudinally aligned in the direction of
ing pin 103 is locked to the bearing housing 102, so that
travel of the blanket 11 passing through the nip N~1.
the roll 101 will be retained in position, during removal
As shown in FIGURE 1, adjustable stop means 60 are
provided for each pressure actuated element or diaphragm 55 of the blanket B-l, or similar major adjustments in the
parts here involved.
40, so that the downward thrust of the fluid pressure actu
ated means 40 is limited, thus in turn limiting the actual
Referring now to FIGURES 3 and 5, it will be seen
spacing between the cylinders 17 and 18 at the nip N-l. . that the arms 110 and 110’ are mounted at one’ end on a
The details of the adjustable stop means 60pwill be de
?xed pivot indicated generally at 120. The extremities
scribed hereinafter.
60 121 and 121’ of the arms 110 and 110’ are formed into
Referring now to the speci?c embodiment of FIGURES
sleeves which, in turn, receive opposite extremities 122
3, 4 and'S, it will be seen that a large roll 100 is shown
and 122' of a pivot pin 123. The sleeve 121 is secured to
only fragmentarily in FIGURE 3 with a nip-de?ning sur
the pin extremity 122 by a washer 124 clamped there
face 100:: opposite a nip-de?ning surface 101a of a sec
against by a lock nut 125; and the corresponding ele
ond roll 101. The nip N-2 receives a traveling ?exible 65 ments indicated in primed reference numerals are em
element in the form of a rubber blanket B-1 and a paper
ployed to retain the sleeve 121' to the opposite end of the
web W-2. The space S between the nip-de?ning surfaces
pin 123. A recessed central portion 123a of the pin 123
100a and 101a is slightly less than the thickness of the
is rotatably received in a ?xed sleeve 126 formed at the
blanket B-1, so that the blanket B-'1 is squeezed at the nip
bottom of a depending frame element 127 secured to the
of a main box frame 128 (FIGURE 3) for the nip
As shown in FIGURES 3 and 4, the roll 101 is rotatably
loading device. The main box frame 128 is suitably se
mounted on bearings within housings 102, 102 at opposite
cured to a ?xed structure such as the ?oor of a building
ends of the roll 101. The bearing housing 102 has a
(not shown). The pin 123 rotates in the sleeve 126 and is
threaded socket 102a at its top which threadedly receives
a centering pin 103. The centering pin7103 is locked in 75 also permitted limited tilting movement so that the rollers
108 and 109 may follow the contour of the press roll or
_ cylinder 101.
The arms 110 and 110’ are thus pivotally mounted
the pressure applied to the diaphragm 137 will not cause
a decrease in the space beyond the predetermined set
sumed to de?ne a “line of contact” between the rolls 100
ting which is controlled by the actual position of the ad
justable saddle 149. Also, it will be noted that the
rounded surface of the lever foot 148 engaging the saddle
149 permits the free adjustment of the assembly at such
and 101 extending laterally of the instant device and
pivot points as the pivot pin 135 and the pivot pins 130
lying in the same plane with the axes of the rolls 100 and
and 130’.
about the axis of the pin 123, which is generally parallel to
the line of the nip N~2. The nip N-2 is theoretically pre
101, notwithstanding the fact that the rolls 100 and 101
The saddle or stop pad 149 is mounted for vertical ad
are actually spaced apart the small distance S.
10 justment by axial movement of a stop screw 150 which, in
In FIGURE 3 it will be noted that the bearing hous
ing 109a at the right hand extremity of the arm 110
mounts a pivot pin 130. As shown in FIGURE 4, pivot
pins 130 and 130' are mounted at opposite ends at the top
turn, is driven by a worm box 151 in a manner well
known per se. The worm box 151 comprises a worm
mounted for rotation on a shaft 152 driving 'a worm gear
which is in the form of a sleeve with its interior threaded
of ‘the bearing housings 109a and 109a’. The pivot pin 130 15 ly engaging the stop screw 150 for relative axial move
is received at its opposite ends by a bifurcated pivot sleeve
131 which, in turn, is locked by a threaded bolt 132 to
The Worm and worm gear are well known struc
tures which do not require further description herein, but
one extremity 133 of a yoke 134 extending across the top
it is su?'icient to note that rotation of the shaft 152
results in axial movement of the stop screw 150. Such
rotation may be effected merely by the use of a ?exible
shaft (not shown) connected at a coupling 153, or it may
be accomplished by the use of an air clutch indicated
generally at 154. The use of a ?exible shaft connected
130 and 130’ move with the arms 110 and 110'.
to the coupling 153 is a well known expedient and the
The central portion of the yoke 134 is connected 25 terminal end of the ?exible shaft is mounted at a control
through a pivot pin 135 to an upwardly extending thrust
panel whereat it is connected to a counter for indicating
rod 136 which in turn, is connected to a diaphragm assem
the number of revolutions of the shaft 152 and thus the
of the I011 109. A similar mounting is provided at the
opposite end of yoke 134 with comparable parts indicated
by the primed reference numerals. The pivot pins 130
and 130' are thus axially aligned along an axis that is
also parallel to the line of- the nip N—2, but the pivot pins
bly indicated generally at 137. The diaphragm assembly
ultimate position of the saddle or stop pad 149. The air
137 and thrust rod 136 are actually protected by a housing
clutch 154 ‘is ‘also ‘a well known structure.
138 indicated in FIGURE 3, but omitted from FIGURES 30
In this particular air clutch structure 154 a shaft 155
4 and 5. The housing 138 extends downwardly from a
is rotated in either direction by ‘an appropriate air motor
top frame element 128a’ and the diaphragm assembly
(not shown). The shaft 155 is mounted on bearings 156
137 is secured to the top frame element 128a and acts
(FIGURES 4 and 5) and 157 (FIGURE 4 only). Also
against the frame element 128a to raise and lower the
it will be noted that a coupling 158 shown in FIGURE 4
yoke 134. It will be appreciated that the pivot pin 135 35 is omitted from FIGURE 5. The shaft 155 mounts a
interconnecting the yoke and thrust rod 136 is adapted to
gear 159 which meshes with ‘another gear 160 connected
permit limited tilting of the yoke 134 about an axis extend
through the shaft 161 to the air clutch expandable mem
ing longitudinally in the direction of travel of the blanket.
ber 162. Air is fed selectively through the shaft 161
The diaphragm assembly 137 comprises a dish-shaped
(for example, through a connection 163 of FIGURE 4)
top member 139 secured to the frame element 12811, a
and 'into the expandable member 162 which engages the
?exible diaphragm element 140 peripherally clamped to
clutch 154 by expanding against an annular member 165
the dish-shaped member 139 by an annular clamp 141,
corotatably mounted on the worm shaft 152. By engag
and the thrust rod 136 having an upper ?ange 136a se
ing the clutch 154 in the usual manner rotation of the
cured to the ?exible diaphragm element 140 by a disk
worm is effected and movement of the stop screw 150
s’naped clamp 13612. A plurality of air hoses indicated at
results. As mentioned, this type of drive mechanism is
142 are carried by the frame 128 and each supplies air to a
well understood in the art and need not be described in
separate diaphragm assembly 137 (as indicated diagram
further detail herein, because it does not form a part
matically at 142a). The air pressure in the diaphragm
of the instant invention. An aspect of the instant inven
137 is controlled so that the desired amount of force is
tion resides generally in means for ‘axially moving the
applied through the rolls 108 ‘and 109 to the portion of
stop screw 150 to ‘accomplish the desired adjustment.
the press roll 101 engaged thereby.
Whatever movement of the worm shaft 152 does take
As indicated in FIGURES 4 and 5, the top frame ele
place can be recorded by measuring revolutions thereof
ment 128a mounts depending frame members 128b and
and this record may be used to determine the exact thick
128s‘ on either side of the diaphragm 137 and these de
ness S at the nip N—2.
pending‘frame members 12819 and 128s carry pivot pins
Referring now to FIGURES 7 and 8, it will be seen
143 and 143', respectively, which pivotally receive the
that a different embodiment of the invention is shown, in
extremities 144 and 144’ of a generally Y-shaped lever
dicated generally by the reference numeral 200. In this
145. As indicated in FIGURE 5, only the extremities of
embodiment 200, elements comparable to those already
the two arms 144 and 144' of the lever 145 are shown.
shown in connection with FIGURES 3 through 6 are
As shown in FIGURE 3, the arms 144 and 144' merge
given a comparable reference numeral ‘in the 200 series.
to form the stem 146 of the Y-shaped lever 145 and
it will be seen that there is a nip N~3 de?ned be
before the arms 144 and 144' merge there is mounted a
tween a lower nipde?ning surface 200a and an upper
pivot pin 147 extending therebetween and pivotally re
nip-de?ning surface 201a formed by a roll 201 of rela
tively small diameter. A rubber blanket B—2 is received
149 mounted for vertical adjustment. The position of 65 [by the nip N-‘3 with -a paper Web W-3. A semi-cylindrical
housing 270 receives a limited portion of the roll 201
the saddle 149 acting through the lever 145 thus limits
comparable in lateral dimension to the portion of the roll
the downward movement of the backing rollers 108
101 backed by the rollers 108 and 109 previously de
and 109 and the portion of the press roll 101 backed
scribed. The roll 201 is clamped in the semi-cylindrical
thereby. The position of the saddle 149 determines the
minimum amount of space S between the nip-de?ning 70 housing 270 by a shoe 271 bolted thereto so that the roll
201 is held ‘against rotation and will not slip out of the
surfaces 160a and 101a. In the’ operation of the instant
semi-cylindrical housing 270 if support from beneath
device, su?icient pressure may be applied through the
(such as the blanket 8-2) is removed.
diaphragm 137 to maintain the space S at the desired
distance in spite of load resisting forces which may be
As indicated, the semi-cylindrical housing 270 forms
created in the traveling blanket B-l; but variations in 75 a bridge between spaced arms 210 and 210' (not shown)
ceived by the thrust rod 136. The lever stem 146 is
provided with a foot 148 that is received in a saddle
I claim as my invention:
1. Apparatus comprising a ?rst cylinder, a second cylin- v
which, in turn, are mounted pivotally at one end on a
pivot pin 223 comparable in structure to the pin 123 al
der de?ning therewith a nip for pressing a traveling ?exi
ble element passing therethrough, a plurality of laterally
spaced members swingably mounted about an axis parallel
to the nip, opposed rollers carried by each of said mem
bers for loading the ?rst cylinder against the second
ready described. At the other end of the [arm 210 there
is a pivot pin 230 connected to one side of a yoke 234.
The yoke 234 is mounted for limited tilting movement
on a pivot pin 235 connected to the lower end of a thrust
rod 236. It will be ‘appreciated that the opposite arm
cylinder at the nip, a separate ?uid pressure actuated
means connected to each of said members for resiliently
210' is symmetrical to the arm 210 and mounts corre
sponding parts so that the pivot 230 corresponds to the
pivot pin 1'30 already described; the yoke 234 corresponds
10 urging said ?rst cylinder toward said second cylinder, a
to the yoke 134 already described and the pivot pin 235
corresponds to the pivot pin 135 already described.
separate stop for each ?uid pressure actuated means
limiting movement of said ?rst cylinder toward said sec
ond cylinder, and independent means for adjusting the
position of each stop relative to the fluid pressure actuated
It should be mentioned that, ‘during operation with a
suitably lubricated rubber blanket B-1 the roll 101 will
cease to rotate. The roll 201 is, of course, held against 15 means associated therewith.
2. Apparatus comprising a ?rst cylinder, a second cylin
rotation so lubrication thereof is required. As shown in
der de?ning therewith a nip for pressing a traveling ?exi
FIGURE 8, the roll 201 comprises a shell 273 having a
ble element passing therethrough, a plurality of laterally
myriad of minute perforations therein. This shell 273 is
spaced members swingably mounted about an axis parallel
securely mounted on a hollow tubular member 274 which
\forms the body of the roll 201. The hollow tubular 29 to the nip, opposed rollers carried by each of said members
for loading the ?rst cylinder against the second cylinder at
member 274 is provided with a plurality of laterally
nip, a yoke pivotally connected to each member about
spaced circurnierentially aligned grooves 275, 276, 277,
another axis parallel to said nip and a separate ?uid
278, 279, etc. The grooves 275, 276, etc. communicate
pressure actuated means pivotally connected to each of
with the ?ne perforations of the outer shell 273 so that
?uid may ?ow therefrom against the blanket B2 and 25 said yokes about an axis extending longitudinally of the
direction of travel of said ?exible element.
lubricate the movement of the blanket B-2 past the roll
3. Apparatus comprising a ?rst cylinder, ?rst bearing
201. Lubricating ?uid in the form of water or the like
means rotatably mounting said ?rst cylinder, a second
from a suitable source, shown diagrammatically at P
cylinder de?ning with the ?rst cylinder a nip for pressing
?ows through a valve V and into any one of a number of
a traveling ?exible element passing therethrough, ?xed
laterally aligned circumferentially spaced conduits 280, 30 bearing
means rotatably mounting the second cylinder,
281, 282, etc. As will be appreciated, valve means V
a plurality of members spaced across the width of the nip,
are provided individually for each of the conduits 280,
?xed pivots mounting each of said members at one end
281, 282 so that ?ow of ?uid in each may be controlled
thereof for swinging movement about an axis parallel to
independently. Each conduit communicates with a
the nip, movable pivots carried at the opposite end of each
groove; and as here shown the conduit 282 communicates 35
of said members, a yoke connected to each of said mem
with the groove 27S and the conduit 281 communicates
bers by said movable pivots, a separate ?uid pressure
with the groove 276. In this way, lubrication at selected
actuated means pivotally connected to each of said yokes
places in the roll 201 may be accomplished.
about an ‘axis extending longitudinally of the direction of
It will be seen that in each of the embodiments of
travel of said ?exible element for swinging said members
the instant invention the use of cylindrical nip rolls (101
about said ?xed pivots, opposed rollers rotatably carried
and 201) is permitted while providing for the equipment
by each ‘of ‘said members for loading the ?rst cylinder
of crowning. This is particularly advantageous since it
against the second cylinder at the nip, pins secured to said
avoids the slippage due to differences in the peripheral
?rst bearing means and carried by said members for move
speeds which are caused by di?erences in diameter along
ment of said ?rst cylinder toward and away from said sec
the length of a crowned roll. In the instant invention it 45 ond cylinder, and resilient means interposed between said
is not necessary to change the “crown” of one or both
pins and said members to allow limited relative move
rolls each time a change of nip loading is required. Even
ment between said ?rst cylinder and said members.
though the nip roll 101 or 201 is itself de?ected, the
short backing elements (such as the rolls 108 and 109)
References Cited in the ?le of this patent
used in this arrangement may be straight, or cylindrical 50
rather than crowned, since ‘over the relatively short length
of each backing roll set, the de?ection curve does not de
Deerr ________________ __ July 13, 1920
part practically from a straight line. The di?erent posi
Ellis ________________ __ Feb. 11, 1936
tions allowed for the individual stop means for each back
Cannity _____________ __ Nov. 29, 1938
ing roll set permits effective crowning, but the resilient
loading means serve to avoid breakage of the equipment
during an accident wherein excessive material may pass
through the nip at a localized point. Actually, the instant
device may be operated without the stop means function
ing, merely by the selective loading of the individual dia 60
phragm assemblies 137. On the other hand, with the stop
means functioning the diaphragm means 137 may be
employed to so load the nip at localized areas that the
‘nip dimensions are maintained at very close tolerances.
It will be understood that modi?cations and variations 65
may be effected without departing from the spirit and
scope of the novel concepts of the present invention.
Merchant ____________ _.. Aug. 23,
Hornbostel ____________ __ Sept. 4,
Hornbostel ___________ __ May 19,
Hornbostel ____________ .. Dec. 7,
Quoos et al ___________ __ Sept. 16, 1958
Australia ________ _..v_____ Jan. 20, 1955
Great Britain __________ __ Dec. 2, 1953
Great Britain __________ __ Dec. 1, 1954
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