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Патент USA US3044552

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July 17, 1962
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J. LOYND
PAPERMAKING MACHINE
Filed June 11, 1959
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3,044,542
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3 Sheets-Sheet 1
July 17, 1962
J. LOYND
3,044,542
PAPERMAKING MACHINE
Filed June 11. 1959
NIH
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_ 3 Sheets-Sheet 2
July 17, 1962
J. LOYND
3,044,542
PAPERMAKING MACHINE
Filed June 11, 1959
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5 Sheets-Sheet 3
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United States Patent 0 "ice
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3,044,542
James Loynd, Neenah, Wis, assignor to Kimberly-Clark
PAPERMAKWG MACE
Corporation, Neenah, Wis, a corporation of Dela
ware
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Filed June 11, 1959, Ser. No. 819,587
4 Claims. (Cl. 162—273)
My invention relates to paper-making machines of the
Fourdrinier type and more particularly to mechanisms
must
_Patented July 17, 1962
.
be yieldably mounted so that the roll may move for every
period of travel of the wire about the rolls to compensate
for the tension changes. that would occur during each
pass of the wire as previously mentioned.
In brief, the invention contemplates a wire tensioning
roll lying on the lower pass of the wire of a Fourdrinier
machine so as to tension the wire. Preferably, air pres
sure actuated ‘di-aphragrns are mechanically connected
with the roll for’ relieving part of the weight of the
roll so as to maintain the tension of the wire at a constant
for tensiom'ng the moving wires of such machines.
10 proper value which is not sufficiently great to cause
A Fourdrinier type papermaking machine generally
stretching of the wire beyond its elastic limit. In addi
comprises a loop of ?ne mesh wire on which a slurry of
paper stock is deposited, the wire being disposed about a
plurality of rolls and travelling about the rolls at high
tion, the improved wire tensioning mechanism contem
plates an adjustable pressure regulator valve in connec
tion with ‘each of the diaphragrns ‘for adjustment of the
speeds. One or more stretch rolls are commonly pro 15 wire tension.
_
_
vided in contact with the lower pass of the wire, and
The invention consists of the novel constructions, ar
these rolls are manually adjustable so that the wire may
rangements, and devices to be hereinafter described and
be tensioned about the rolls.
It has been found very difficult, using the manually
adjustable stretch rolls, to provide the proper tension on
claimed for carrying out the above stated objects ‘and such
other objects, as will be apparent from the following
description of a preferred form of the invention, illus
trated with reference to the accompanying drawings,
the Fourdrinier wire. Should the adjustable (rolls be so
set that the wire tension is too great, the high tension may
wherein:
'
'
cause a stretching of the wire beyond its elastic limit; so
FIG. 1 is a diagrammatic elevational view of a paper
that subsequent, undesirable stretching of the wire con
making machine including a Fourdrinier wire traveling
tinues to occur during the life of the wire. On the other 25 around a plurality of rolls one of which is a wire tension
hand, wire Itension that is too low may be expected to
ing roll;
'
cause slippage of the wire with respect to certain of the
FIG. 2 is a front elevational view on an enlarged scale
rolls, causing premature wearing of the rolls ‘and the wire.
of the'wire tensioning ‘roll and mechanism for moving
Slackness in the Fourdrinier wire can also cause wrinkling
the roll in -a substantially vertical direction;
of the wire and a jumping or movement up off the wire 30
FIG. 3 is a sectional view taken on‘ line 3-3 of FIG.
of globules of slurried stock shortly after its deposit on
the wire, and this stock jumping causes poor formation
of the paper web.
Fourdrinier wires, particularly when they are new, may
‘be expected to increase in length during usage. .Such in
creases in length cause decreases in the wire tension re
sulting in the premature wearing and other di?iculties just
,mentioned. In prior structures, there may be compen
sation for these increases in wire length by manual ad
justment of the stretch rolls; however, the increases in
length take place so rapidly that frequent adjustments of
the stretch rolls are necessary.
The rolls in prior
with respect to each
of the stretch rolls.
about the rolls tends
Fourdrinier machineslare all ?xed
other between times of adjustment
The Fourdrinier wire as it travels
in effect to contract ‘and expand in
-2; and
FIG. 4 is a side elevational view of the wire tensioning
roll and the mechanism for moving the roll.
Like characters of reference design-ate like parts in the
several views.
Referring now to FIG. 1, the illustrated paperrnaking
machine includes a Fourdrinier wire 10‘ positioned about
a breast roll 11, a couch roll 12, table rolls 13, idler rolls
14, a stretch roll 15, and a wire tensioning roll 16. A
head box or pressure 1feed system 17, which may be of
any conventional type, is positioned above the wire, and
slurried stock from the ‘headbox or pressure feed system
is disposed on the wire by means of a slice v18. Vacuum
boxes 19 are positioned beneath the wire 10 and beyond
the table rolls 13.
1
The wire tensioning roll 16 is supported on its ends by
length periodically having, for example, a cycle of con
platforms 20 which are movably attached, as will be
traction and expansion for each pass of the wire about
presently described, to horizontal members v21 of the
the rolls. This may be due to a variable vacuum e?ect
Fourdrinier machine frame to permit movement of the
on the wire by vacuum boxes positioned beneath the wire, 50 wire tensioning roll :16 in a substantially vertical direction.
as well as by table rolls supporting the upper pass of the
Bell crank levers 22 are pivotally connected with respect
wire, to built-in inaccuracies in the machines, such as in
to downwardly extending arms 23 of the platforms 2%
the diameters of the rolls, and to unavoidable variations in
by means of pivot pins '24 extending through anti-friction
speed of drive of the wire. The wire may thus be ‘ex
bearings 25 set within the levers 22. The lower arms of
55
pected to have variations in tension during each pass
the levers 22 are’ in the ‘form of yokes and carry spherical
about the rolls, which ‘are at a
frequency due to the
bearings 26, which rotatably mount the wire tensioning
high speed at which the wire is driven.
roll 16 with respect to the levers 22.
‘
It is therefore an object of the present invention to
Referring to FIGS. 2 and 3, the paper machine may
provide improved mechanism in connection with such
be seen to have mechanism ‘for vertically moving the
papermaking machines ‘for causing the wire to be con 60 wire tensioning roll 16 including an adjustable handwheel
stantly and properly tensioned so as to thereby increase
27. The wheel 27 is ?tted onto a sha?t 28‘ axially aligned
the life of the equipment and avoid the related inferior
with a second shaft 28 both of which are rotatably sup
quality of web 1associated with improper wire tension.
ported by housings 29 rigidly a?ixed to the horizontal
More particularly, it is an object of the invention to
members 21. A bar 30 joins the two shafts 28 by means
provide, in such a machine, a wire tensioning roll resting 65 of couplings 31. Each of the shafts 28 has a worm v32
by virtue of its own weight on the lower pass of the
?xed thereon and positioned within the respective housing
Fourdrinier wire holding the wire under constant tension,
29. Each worm 32 is externally meshed with a revolving
and it is a further object to provide mechanism in con- '
nut 33; and vertical screws 34, extending upwardly from
nection with such a wire tensioning roll for partially sup
the platforms 2%, pass through the nuts 33 land are thread
70
porting the roll to maintain the wire tension at a proper
edly engaged therewith. The nuts 33 are held axially
value. It is contemplated that the roll shall preferably
stationary within the housings 29 by upper and lower
3,044,542
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bearings 35 which encompass the vertical screws 34.
Guide bars 36 extend vertically upwardly from the plat- "
forms 20 and are received by suitably adapted sockets
37 within the housings 29.
v
.
.
As shown in FIGS. 3 and 4, a power unit 38 is mount
ed on one end of each platform 20 for the purpose of
I moving the upper ends of the levers 22. The power
units 38 each comprise a casing 39 supporting a ?exible
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so as to act upon the movable ends of the levers 22 and
by means of the ?exible diaphragms 26 respondT130
7 changes in pressure within the inlet conduits 41.
e
air pressure within each inlet conduit 41 connected to
the source of pressure 42 is maintained at a selected
level by the respective manually operated regulator valve
43. The air under pressure admitted to the'casings 39
from the inlet conduits 41 tends to force the ?exible
diaphragms 40 outwardly, as seen in FIGURE 4. The
diaphragm 4G. The closed side of the diaphragm casing
v39 is connected by means of an inlet conduit 41 to a 10 pressure rods 44,‘ which follow. the diaphragms 40 by
'_ source ofair pressure 42, and pressure is maintained at
a given level in the conduit 41 by a regulator valve 43.
virtue of their attachment to the inner diaphragm plates
45 and the outer diaphragm plates 46, transmit the forces
exerted on the diaphragms through the clevises 47 to the
A pressure rod 44 is rigidly attached to each of the Y
upper end of the levers 22. The levers 22 are pivotally
flexible diaphragms 40 by means including an inner dia
phragm plate 45 and ‘an outer diaphragm plate 46. A 15 connected to the clevises 47 by the pins 48 and are mov
able about the downwardly extending arms 23 of the plat
'clevis 47 is adjustably attached to the opposite end of
forms 20. Since the lower arms of the levers 22 sup
each of the pressure rods 44 and receives a pivot pin
port the wire tensioning roll 16, the forces applied to the
48 extending through an anti-friction bearing 49 set With
upper arms of the levers 22 from the power units 38 tend
in the lever 22 for pivotally connecting the rod 44 with
respect to the upper end of the lever 22.
20 to move the roll 16 arcuately in a generally upward di
rection and relieve a part of the weight of the roll 16
A threaded stud 50 extends vertically downwardly
from each of the platforms 20 and passes slidably through
on the wire 10.
,
A level of air pressure for actuating the power units
38 is selected in accordance with the amount of tension
ment of the lower ends of the levers 22 is restricted by
upper and lower nuts 52, adjustable to various limiting 25 desired in the wire 10. If a high wire tension is desir
able, the air in the power units 38 is maintained at a‘
positions on the threaded studs 50.
low pressure by the regulator valves 43, for example,
A graduated scale 53 is attached to the lower ‘arm
10 pounds per square inch. A lower wire tension would
‘of each of the levers 22 and is aligned with a pointer
be maintained by increasing the air pressure in the power
'54, which extends downwardly from each of the plat
forms 20, so that theyregister relative vertical movement 30 units 38 to some higher level and thus relieving a great
er portion of the weight of the roll 16 by the action of
of the lower end of the lever 22 with respect to the
an opening 51 in the associated lever 22. Vertical move
platform 20.
'
the mechanical linkages heretofore described.
'
When the wire is properly tensioned, the lower parts
In the operation of the Fourdrinier papermaking ma
of the levers 22, through which the studs 50 extend,
chine described above, the Fourdrinier wire 10 passes
around the rolls 11, 12, 13, 14, 15 and 16, and one or 35 lie between the limiting nuts 52, which are suitably posi
tioned on the studs 50 to prevent undue movement of the
more of the rolls is rotatably driven by any suitable driv
roll 16 and the levers 22 with the consequent movement
ing mechanism (not shown) to provide such wire move
of the pointers 54 beyond the scope of the respective
ment. Slurried stock is contained within the headbox
graduated scales 53.
17 and issues out of the slice 18 onto the Fourdrinier
The Weight of the wire tensioning roll 16, when the
wire 10 to form a web on the wire. The vacuum boxes 40
levers 22 are out of contact with the nuts 52, is par‘
19 are disposed within the wire 10 and in close contact
tially supported by the power units 38 acting through the
therewith and draw water from the web. The couch roll
levers 22 and partially-supported by the wire 10 itself.
12, from whence the partially dewatered web is trans
The linkages previously described are made as friction
ferred to a press section (not shown), where more water
less as possible by-the antiefriction bearings 25 and 49,
is expressed from the web, constitutes a direction chang
and the wire 10 in changing length repositions the wire
ing roll permitting the continuous wire 10 to return by
tensioning roll 16 vertically, lowering the roll when the
‘means of a lower pass to the breast roll 11.
wire length increases and raising the roll when the wire
The idler rolls 14, the stretch roll 15 and the wire
length decreases. The roll 16, hearing on the wire 10
tensioning roll 16 are in contact with the lower pass of
the wire 10 and maintain the wire in a looped con?gura 50 with the portion of its weight that is unsupported by the
power units 38, maintains the wire at a substantially con
tion. The wire tensioning roll 16 is suspended between
stant tension regardless of the length of the wire. ,
the adjustable platforms 20, so that the roll may be
Rapid increases in wire length usually occur on the
lowered to remove slack from the wire 10 by turning
papermaking machine following installation of a new
the handwheel 27 manually.
’
Fourdrinier wire. Using the present invention, the loss
As the handwheel 27 is rotated in a clockwise direc
of tension in the wire previously associated with such
tion, as seen in FIGURES 3 and 4, the motion is trans
increases is eliminated, since the roll 16 due to its own
mitted by means of the shaft 28 on which the hand
weight moves downwardly to take up the wire as it
wheel 27' is ?xed, the bar G30, and the couplings 29 to the
stretches and maintains the initial wire tension. In<
opposite shaft 28, so that each of the worms 32 revolves .
the respective rotatable nut 33 about its vertical screw 60 frequent changes in the manual adjustment of the plat
forms 20 are required from the operator, and the nec
34. The nuts 33 are retained within the housings 29
essity for these changes can be seen by a glance at the
by the upper and lower bearings 35, vand the screws 34,
pointers 54 which indicate the relative position of the
when the nuts are so rotated, move the platforms '20
lower ends of ‘the levers 22 with respect to the nuts
downwardly. The guide bars 36 are retracted from the
sockets 37 on either side of the screws 34 in such an 65. 52. If, through some inadvertency, the Fourdrinier wire
'10 stretches su?iciently so that the wire tensioning roll
even manner that the platforms 20 remain parallel with
"16, suspended from the levers 22 connected to the plat
respect to the horizontal frames 21 at all positions of
forms 20, descends beyond the limits of the scales 53
travel. At some lower position of the platforms 20, the
as indicated by the pointers 54, the lower nuts 52 will
wire tensioning roll 16 engages the Fourdrinier wire 10.
The present invention provides a degree of ?exibility to 70 support the lower ends of the levers in downwardly
limiting positions until the platforms 20 are further low
this manual setting by utilizing the levers 22 which per
ered manually by means of ,the handwheel 27. The
mit further limited movement of the wire tensioning roll
pointers 54 ‘are thereby restored to an operable point
16 and thus keep the tension in the wire 10 substan
along the scales 53 as required for correctly tensioning
tially constant as long as the lower arms. of the levers
' the wire. After the run-in phase of the wire 10, the
22 are free to move.
.
'
'
' '
'
The power units 38 aremounted on the platforms 20
wire tensioning roll 16 is automatically repositioned to
5
sense
maintain the desired tension in the wire 10 for extended
periods, and manual adjustment is seldom necessary.
During operation of the Fourdrinier machine, there
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I wish it to be understood that the invention is not to
be limited to the speci?c constructions and arrangements
shown ‘and described, except only insofar as the claims
may be so limited, as it will be understood to those skilled
in the art'that changes may be made without departing
tend to occur, for each pass of the wire 10 about the rolls,
small changes in wire tension due to the variable action
of the table rolls 13 and the vacuum boxes 19, as well as
from the principles of the invention.
to unavoidable variations in speed of drive of the wire
I claim:
and other inherent machine characteristics. Since the
1. In a papermaking machine, an endless fabric, a plu
wire tensioning roll 16 rests on the wire 10, the roll 16
rality of rolls including a tensioning roll for holding said
moves downwardly when the wire thus tends to decrease 10 fabric in the form of “a loop,'means for driving one of
momentarily in tension, and when a momentary increase
said rolls‘ so as to drivingly move said fabric, movable
of wire tension tends to occur, the wire 10 raises the roll
mounting means for said’tensioning roll arranged so that
16. Though these tension changes that tend to occur are
the roll rests on said fabric due to the weight of the roll
small, their frequency is on the order of once or more per
and is ‘supported by the fabric, a fluid pressure operated
wire pass, so that an almost continuous upward and down 15 power mechanism acting on said mounting means in such
ward oscillatory movement of the wire tensioning roll 16
a direction that it tends to counter-balance the weight of
results while maintaining the wire tension substantially
said tensioning roll, and 1a source of ?uid under pressure
constant, and the compressibility of the air from the air
in continuous connection with said power mechanism
pressure source 42 accommodates the resultant rapid
while said fabric is being driven, said pressure being at
movements of the bell cranks 22 and diaphragms 40‘.
such a predetermined value and ‘said power mechanism
When the wire tensioning roll 16 undergoes a change 20 having such a purchase on said movable mounting means
of position involving movement of the levers 22, the pres
so as to apply a certain continuous lifting force on said
sure rods 44 act to reposition the diaphragms 40, so that
the pressure regulator valves 43 supply air to or exhaust
tensioning roll sufficient to counter-balance only a part of
the weight of the tensioning roll on said fabric.
air from the conduits 41 to maintain a constant pressure
2. In a papermaking machine, an endless fabric, a plu
25
within the diaphragm casings 39.
rality of rolls including a tensioning roll for holding said
The wire tensioning roll 16 may be canted to compen
fabric in the form of a loop, means for driving one of
sate for unequal wire lengths or unequal rates of stretch,
said rolls so as to drivingly move said fabric, movable
which may occur from side to side across the endless
mounting means for said tensioning roll arranged so that
F ourdrinier wire 10, by setting each of the regulator valves
the
roll rests on said fabric due to the weight of the roll
43 to apply a di?erent pressure to its respective power unit 30 and is supported by the ‘fabric, air pressure operated power
38.
>
mechanism acting on said mounting means in such a direc
In a certain particular example of the present invention,
tion that it tends to counterbalance the weight of said
subsequent to the installation of a new wire, an operating
pressure of 30 pounds per square inch is admitted to the
tinuous connection with said power mechanism while said
regulator valves‘ 43. The wire tensioning roll 16 is then
lowered manually by means of the handwheel 27 until it
contacts the wire, ‘and the wire 10 is driven slowly at
crawl speed, which may be 100 feet per minute, about the
determined value and said power mechanism having such
a purchase on said movable mounting means whereby the
power mechanism applies a certain continuous lifting
force on said tensioning roll su?‘icient to counter-balance
tensioning roll, and a source of air under pressure in con
power units 38 and is maintained therein by the pressure 35 fabric is being driven, said pressure being at such a pre
rolls 11, 12, 13, 14, 1S, and the wire tensioning roll 16.
only a part of the weight of the tensioning roll on said
fabric and absorbs and permits small movements of the
tensioning roll with movement of the fabric.
on the wire in such manner that the pointers 54 are free
3. In a paper-making machine, an endless fabric, a plu
to move along the graduated scales 53. The Fourdrinier
rality of rolls including a tensioning roll for holding said
45
machine may then be brought slowly to operational speed,
fabric in the form of a loop, means for driving one of
such as, for example, 1400‘ feet per minute, during which
said rolls so as to drivingly move said fabric, movable
time formation of the web is initiated by admitting the
mounting means for said tensioning roll arranged so that
Further manual lowering of the roll 16 increases the ten
sion in the Fourdrinier wire 10 until the roll is supported
slurried stock to the headboX 17 so that it issues from
the ‘slice 18 onto the wire 10.
said roll rests on said vfabric due to the weight of the roll
During the period that initial stretch is being removed
from the new wire 10, infrequent manual readjustment
downwardly of the platforms 20 by the machine operator
is needed to insure that the wire tensioning roll 16 has
operated power units acting on said mounting means in
such a direction that they tend to counterbalance the
and is supported by the fabric, a pair of air pressure
weight of ‘said tensioning roll, each of said power units
comprising a diaphragm mounted at its periphery within
freedom of movement and that the lower ends of the levers
a housing and having the central portion of each dia-,
22 do ‘not rest on the lower limiting nuts 52. After sev 55 phragm connected with said movable mounting means,
eral hours or perhaps a day, substantially all of the initial
and a source of air under pressure in continuous connec
stretch is out of the wire 10, and further manual read
tion with'said power units while said fabric is being driven,
justment of the platforms 20 is seldom necessary during
said pressure being at such a predetermined value and
routine operation.
said power units having such a purchase on said movable
60
Imposed upon the above stretch removal action is the
mounting means whereby the power units apply a certain
motion of the wire tensioning roll 16 reacting to the
continuous lifting force on said tensioning roll suf?cient to
cyclical changes in length of the wire 10, the roll rising as
counter-balance only a part of the weight of the tension
the wire tension tends to increase ‘and falling as the wire
ing roll on said fabric and said diaphragms acted on by air
tension tends to decrease. A ?oating motion is thus im
pressure absorb and permit small movements of the ten
parted to the roll 16, which may have a frequency, for ex 65 sioning roll with movement of the fabric.
ample, of 15 oscillations per minute.
4. In a paper-making machine, an endless Fourdrinier
Using my improved wire tension mechanism, the Four
wire, a machine frame, a plurality of rolls including a
drinier wire 10 is automatically and constantly tensioned
breast roll and a couch roll and -a wire tensioning roll,
correctly during the preliminary wire stretch phase as well
means for rotatably attaching said rolls to said frame so
as during subsequent machine operation. A suitable ten
that they hold said wire in the form of a loop, means for
sion thus maintained in the wire 10‘ increases equipment
driving one of said rolls so as to drivingly move said
life, and gives improved operation and product.
In addition, the mechanism herein described is simply
constructed, requires little maintenance, and may be an
inexpensive addition to existing equipment.
a wire, said ‘attaching means including a pair of platforms
suspended from said frame and a pair of bell cranks pivot
ally attached to said platforms and having said wire ten
75 sioning roll mounted between larms thereof so that the roll
3,044,542
7
the weight of the tensioning roll on said wire and absorb
‘and permit ‘small movements ‘of the tensioning roll with
rests onthe wire due to the weight of the roll and is sup
7 ported by the wire, means'for adjusting said platforms
vertically so as to position said wire tensioning roll on said
movement of the wire.
, wire, air ‘pressure operated power units mounted on said
platforms so as to act" on the other arms of said bell
3
References Cited in the ?le of this patent
cranks in such a direction tending to counterbalance the
weight of said wire tensioni-ng roll’, a source of air under
pressure in continuous connection with said power units
while said wire is vbeing driven, and regulator valves for
maintaining, at selected values the air pressure supplied 10
-
UNITED‘ STATES VPATENTS
1,582,322
7
1,885,163
Warren _____________ __ Apr. 27, 1926
:
Wliite___,_ ___________ __ Nov. 1, 1932
2,452,980
Beltz Q _______________ _... Nov. 2, 1948
from said source to said‘ power units, said pressure being
2,623,630
' Erickson _____________ __ Dec. 30, 1952
at such predetermined values and said power units having
2,799,209
Wisner et a1. _________ __ July 16, ‘1957
Beaufort ___;__-_' _____ __ July 15, 1958
2,843,431
such a purchaseon said hell cranks whereby the power
units apply a certain continuous lifting ‘force on the said
2,907,450
tensioning roll su?icient to counter-balance only a part of 15 . 2,918,970
Reid __'_ _____________ __ Oct. 6, 1959
Printz ___._1 _____ _-______ Dec. 29, 1959
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