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Патент USA US3045370

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July 24, 1962
A. v. ALEXEFF E'I‘AL
3,045,360
EXPANSIBLE OVEN STRIP PROCESSING MEANS
Filed July 21, 1959
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ATTORNEYS
July 24, 1962
A. v. ALEXEFF ETAL
3,045,360
EXPANSIBLE OVEN STRIP PROCESSING MEANS
Filed July 21, 1959
5 Sheets-Sheet 3
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ALEXANDER v. ALEXEFF
a HOWARD‘ R. RICHARDS
BY 6%, M
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ATTORNEYS
3,045,360
nit-ed tates Patent 0 "ice
Patented July 24, 1962
2
embodiments of the invention. As will be apparent to
.
those familiar'with strip processing, speci?c mechanical,
3,045,360
EXPANSIBLE OVEN STRIP PROCESSING MEANS
electrical or hydraulic control components to be em
ployed in any given installation may be a matter of
Alexander V. Alexetf, Cleveland, and Howard R. Rich
ards, Lakewood, Ohio, assignors to Industrial Ovens,
choice. Suitable apparatus in each illustrated embodi
ment is therefore illustrated'schematically and is sepa
rated into given components for given functions to an
extent greater than necessary rather than being illustrated
as integrated multiple-function components, all this being
Incorporated, Cleveland, Ohio, a corporation of Ohio
‘
Filed July 21, 1959, Ser. N . 828,647
8 Claims. (Cl. 34—52)
This invention relates to line processing of webs and
strands and particularly to means for attaining uniformity
of exposure of the material undergoing treatment within
done in the interest of clarity in order that the invention
maybe most concisely and completely disclosed and
a treating chamber during transients in line v velocity.
For purposes of this application, “strands” is to be un
derstood to include mono?laments such as nylon, rayon,
understood.
‘
In the drawings:
FIGURE 1 is a partly schematic and partly diagram
and glass ?ber as wellas wires, cords, narrow tapes and 15 matic illustration of a semi-continuous strip processing
system embodying the invention.
tubings, and “strips” is to be understood to include
FIGURE 2 is a similar illustration of another embodi
strands and also Webs such as metal sheet, paper, textiles,
mentof the invention in a semi-continuous strip process
?lms and wide tapes.
ing system.
'
In many present day continuous or semi-continuous
strip treating applications, it is desirable to maintain a 20 The remainderof the ?gures, starting with FIGURE
high degree of uniformity of treatment of the strip from
3A and ending With'FIGURE 63, illustrates in graphic
form certain velocity-time functions and acceleration
increment to increment of its length. This is particularly
desirable where the treatment can be wholly satisfactory
time functions which are of signi?cance in the description
of the invention.
only when carried out Within narrow critical ranges of
FIGURE 1 illustrates a semi-continuous installation in
conditions.
25
which the invention is employed. The illustrated instal
A purpose of the present invention is to provide for a
lation might be employed in connection with dip-coating
high degree of uniformity under transient conditions,
particularly under conditions where web speed is changed
a Web, the Web then being heated, dried and simulta
neously stretched under. considerable tension. In appli
atsuch a rate as to signi?cantly disturb the uniformity of
exposure from increment to increment of the length of 30 cations of this type, it is frequently important to maintain
a uniformity of treatment of increments of the web length
the strip in the vicinity of treating chamber during the
change in Web speed.
and to maintain treating conditions as constant as pos
sible from increment to increment of the strip length.
The invention so relates the movement of strip guiding
In the illustration, the strip comprises a Web 10.
means within the treating chamber to changes in strip
speed as to achieve uniformity of exposure of every in 35 Components of the installation shown in FIGURE 1
include a let-off stand 11; a dip station 13; a ?rst pull
crement of strip length. The invention involves the con
roll stand 14; a treating chamber indicated generally by
cept of translating the strip guiding means in a path in
the reference numeral 15, which might for example be
' the chamber to vary the instantaneous length of strip
a heating chamber; a complementary treating chamber
material within the chamber, and slaving velocity of the
guiding means to the increasing change in velocity of the 40 16, which in many applications will not be employed but
strip during the shorter ,of desired exposure time and ' which in the illustrated application may be provided and
strip speed transient time, then continuing strip guiding
may constitute a cooling tower; a web-length-sensing
stand .17; a second pull roll stand 18; and a Wind-up
means translation at attained velocity until the longer of
such two times expires, and then reducing the velocity of
the strip guiding means as a function of time symmetrical
to the time-function of velocity increase of the strip
stand 19.
45
’ .
The installation may employ, in any conventional man
ner, a plurality of variable speed DC. motors as a power
and control means for the several web driving members.
The power and control system may comprise a motor 20;
a generator ,21; a ?eld exciter 22; an overriding or gov
concept of slaving translation velocities of the web guid
ing means with reference to and as a direct proportion 50 erning speed control rheostat 23.; and a plurality of
guiding means which has just occurred. a
'
The invention may also be viewed as embodying the
ties established by a suitable speed reference means,
voltage-responsive, variable speed DC motors 24, 25
and 26, each of these motors with the exception of the
motor 24 being provided with its own subsidiary speed
which reference means is adapted at the beginning of a
control means such as ?eld voltage rheostats 27, such
of the differential between instantaneous strip velocity
on the one hand and on the other hand reference veloci
strip speed transient to indicate the previously-established 55 subsidiary speed control means being responsive to varia
tion in length between severalpoints in the system as
strip velocity which is being departed from and which
explained below. Speed ‘reducers 28 are associated with
each of the motors 24-—-26 and also with an additional
motor 29 which is not provided with its own subsidiary
as a time-function'reversely pro?led to the time-function
of the'preceding departures of strip velocity from indi 60 ?eld voltage rheostat but which is provided with a speed
control rheostat 30 parallel to the rheostat 23 and adapted
cated reference velocities.
to govern the speed of the motor 29 as a function of
The objects and advantages of the invention will be
the‘ adjustment of the rheostat 30 which is exactly the
come apparent from the following description of speci?c
same as the function by which the control of the speed
reference means, after an interval equal to the desired
strip exposure time variation, indicates reference velocity
3,045,360
3
4
of the motor 24 is governed by adjustment of the rheo—
connection to the shaft 59 is effected through a clutch
stat 23.
The treating chamber 15 may be constructed and ar
ranged so that both entrance and egress of the web 10
instantaneously brake the shaft 59 to a complete stop in
and-brake device 60 of the type adapted to substantially
one position and to substantially instantaneously couple
occurs through the port 42 during normal operation, the
web being guided into ‘and out of the port by the rolls
41. Within the chamber 15, the web passes around web
the shaft 59 to the associated shaft 58 for rotation there
with (without ‘appreciable braking of the motor 55) when
the device 60 is in the opposite position. The device 60
guiding means comprising in this instance a single dancer
is moved to clutch-engaging position by closing of a tim
roll 40. The dancer roll 40 is mounted for lateral dis
ing switch 61 and is moved to brake-engaging position by
placement so that it may be shifted up and down in a 10 opening of the timing switch 61.
vertical path within the treating chamber 15 and may,
The other of the shafts 58 is connected to a shaft 62
furthermore, be translated a sufficient extent to pass
governing the angular position of the rheostat control
completely, or at least partially, out through the port
arm of the rheostat 38. This connection to the shaft
42. For this purpose, the ends of the dancer roll 40
62 is effected through a clutch-and-brake device 63 simi
may be mounted in blocks which are engaged by an 15 lar to the clutch-andebrake device 60. The device 63 is
endless cable or chain ‘43 at either side of the oven.
Each cable or chain 43 passes around associated sprockets
or sheaves 44, one of which is powered by a reversible
motor 45 through a speed reducer 48. The motor 45 is
controlled by an on-olf and reversing switch 46. The
speed reducer 48 is connected to its associated sheave 44
through a one-way clutch or torque transmitter 47, i.e.,
a clutch adapted to transmit torque in either rotative
direction but only in the axial direction from right to left
as seen in FIGURE 1, application of torque in the oppo 25
site axial direction resulting in uncoupling or disengage
ment of the clutch 47.
The result is that the dancer
moved to clutch-engaging position by closing of a tim
ing switch 64 and to brake-engaging position by open
ing of the timing swtich 64. The time interval of the
timing switch 64 is set by a ‘control knob 65, and the
switches 64 and 61 are tied together as by a shaft 70 so
that setting of the timing switch 64 for a given timing
interval also results in setting of the timing switch 61 for
the same timing interval.
' The timing switches 61 and 64 are supplied from a
line 66 as by closing of a switch 67. Between the switch
67 and the timing switch 64 is inserted a time delay
switch 68 having a control knob 69 for varying the time
, roll 40 may be moved up and down by additional means
delay interval thereof. The result is that when the switch
67 is closed, current is immediately applied to the tim
reducer 48 or the motor 45 when the motor 45 is not 30 ing switch 61 which closes vfor the pre-set interval ‘and
running.
then opens. After the time delay established by the
Means for slaving motion of the dancer roll 40 to
time delay switch 68, the timing switch 64 also closes
transients in web motion are provided which in the i1
for the identical pre-set interval and then opens.
lustrated apparatus includes a differential linkage 50‘ with
During the time the switch 61 is closed, the position
inputs from the output shafts of the speed reducers asso 35 of the control arm of the rheostat 23 is changed at a rate
‘to be described below without being braked by the speed
ciated with the motors 24 and 29 and with an output 51
tying through a friction connection 52 to a drive for one
of the sprockets or sheaves ‘44. The friction connection
52 is such that it may be overcome by actuation of the
and in a direction determined by the rate of rotation and
directional setting of the control 56 associated with the
motor 55. The identical movement occurs in connection
with the control arm 30 but at a later time interval, the
dancer roll 40 by the motor 45, but any new angular 40 start of which is determined by the pre-set time delay in
terval of the switch 68.
output shaft 51 and the associated sheave 44 will remain
It will be apparent that the speed of the motor 55 will
established upon cessation of translation of the dancer
govern the rate of change of angular positions of the con
relationship thereby established between the differential
roll 40 by the motor 45 to thereby establish a new datum
position for the roll 40 from which it will move upon
subsequent actuation of the output shaft 51 of the dif
ferential 50.
It will thus be understood that the output shaft 51
trol arms of the rheostats 23 and 30 and will therefore
govern the rate of acceleration of the outputs associated
with the motors 24 and 29. Since the shaft 51 rotates at
a speed which is one-half the di?erence in speed between
the outputs of the speed reducers 28 associated with the
motors 24 and 29, it will be understood that the shaft 51
will rotate at a rate proportional to the difference between
the rate of rotation of the outputs of the speed reducers
associated with the motors 24 and 29. In the illustrated
accelerates at one-half the rate of acceleration of the dif
apparatus, the rate of rotation of the output 51 will be
half the difference between the rates of rotation of the
time as the motor 29 maintains a constant speed of rota
input shafts.
It will be ‘understood that electronic sensing and con
trol means may be provided instead of the mechanical
linkages of the types disclosed, which are set forth for
the purpose of most clearly illustrating the invention.
ferential input shaft powered by the motor 24 during such
tion and that the shaft 51 accelerates in an algebraically
negative direction (decelerates) at one-half the rate of
55
acceleration of the differential input shaft powered by
the motor 29 when the motor 24 maintains a constant
speed of rotation. It will also be clear that the shaft 51
rotates at a constant speed (zero acceleration) when the
As previously mentioned, the speed of the motor 29 is
24 and 29 are operating at different speeds but are
governed by the position of the rheostat 30 which con 60 motors
accelerating or decelerating at the same rate. Accord
trols armature voltage and which is connected in parallel
ingly, it will be seen that translation velocity of the roll
with the armature voltage controlling rheostat 23 for
40 in its vertical path within the treating chamber 15 is
the motor 24 or is connected in any other way such that
responsively
varied with reference to the amount of and
the difference between the speeds of the two inputs to
the differential 50 will be proportional to the angular 65 sign of departure of the speed of the motor 24 (and veloc
ity of the web 10) from the reference velocities indicated
difference in position between the control arms of the
by the reference means comprising the output of the
rheostats 23 and 30.
motor 29 and speed reducer 28, and as ‘a direct proportion
There is provided a timing and transient controlling
of such departure. It may be assumed in the speci?c ap
linkage including a reversible variable speed motor 55
which may be set for a given speed of rotation in either 70 paratus illustrated that the effective diameter of the pow
ered roll 72 in the pull roll stand 14 is the same as the
direction by a suitable control 56. The motor 55, through
effective diameter of the drive sheave 44 which is powered
a speed reducer 57, drives output shafts 58 at identical,
by the differential output shaft 51.
although adjustable, speeds of rotation. One of the shafts
58 is connected to a shaft 59 governing the angular posi
When the web processing line is started up and attains
tion of the rheostat control arm of the rheostat 23. This 75 a given velocity, the switch 46 is manually closed to move
3,045,360
5
g .
the position of the dancer roll 46 to a desired height so as
to establish a desired exposure time Within the treating
transient. FIGURES 6A and 6B are generally similar to
FIGURES 5A and 5B but represent the curves where
time of web-velocity transient is greater than time of ex
chamber 15 for the given web velocity. The switch 46 is
then opened. Now, if it is desired to change web speed
posure within the treating chamber.
without changing exposure time for any increment of the
passing web, the speed control 56 of the motor 55 is ad
justed to determine the rate of acceleration or decelera
The relationship between the curves vamp and vref in
both FIGURES 5A and 6A will be seen to be a relation
ship of reverse pro?ling as above described. These curves
tion, the rotational direction chosen determining whether
represent a somewhat more general case of reverse pro
there shall :occur acceleration or deceleration.
>
A suit
?ling than that illustrated in FIGURES 3A and 4A.
able dial associated with the control 56 may be calibrated 10 Again it will be seen that they extend between the same
to indicate the speed of motor 55 and therefore the rate
velocity limits. Again it will be seen from the associated
of acceleration or deceleration of the line. The new line
FIGURES ‘5B and 6B that the strip acceleration (asmp)
speed to be attained may then be chosen by adjusting the
and the acceleration of the reference means (aref) are sym
control 65‘ to pro-set the time during which the change in
metrical about an ‘axis at the midpoint in time between the
web speed will occur. Determination of this time interval
time extremes of the curves vsmp and vmf.
together with the ‘determination of the rate of acceleration
It will be understood vfrom the above discussion that
or deceleration will, of course, preestablishthe new line
the relationship of the motion of the guide roll'means
speed. The control 69 for the switch 68‘ is preset to the
to web velocity transients may also be de?ned in the
desired exposure time which theweb is .already experi
following terms: Inward (upward) or outward (down
encing within the chamber 15.
'
20 ward) translation of the dancer roll 40 is slaved to posi
When these settings have been made and when the
tive and negative acceleration, respectively, of the strip,
transient is to be started, the switch 67 is closed. Imme
and instantaneous translation velocity of the dancer roll
diately, the control arm of the rheostat 23 moves at a rate
in such directions occurs as a direct proportion of the
determined by the speed of the motor 55 causing the line to
instantaneous ‘departure of strip velocity from the strip
accelerate at the desired rate and for the desired time. 25 velocity prior to the transient until there has elapsed fol
At the end of such time of acceleration, the switch 61
lowing initiation of strip acceleration the shorter of (1)
opens and the control arm of the rheostat 23 instantane
the exposure time within the treating chamber 15 and
ously stops.
(2) the strip velocity transient time, and dancer transla
tion then continues at constant velocity until the longer
Meanwhile, the switch 68 closes after a time interval
equal to strip exposure time within the chamber '15, and 30 of intervals .(1) and (2) above expires, and ?nally ve~
the reference velocity indicated by the output of the mo
ilocity of the dancer roll is varied to decrease the velocity
tor 29 thereupon begins to change as a time-function re
versely pro?led to that of the departure of strip velocities.
as a function of time symmetrical to the time-function
according to which it has just been increased.
‘
The reverse pro?ling above-mentioned has reference
to a relationship between two velocity-time curves such
In the following'discussion, it has been assumed, as
has been the case in practice up to the present time, that
that they extend between the same velocity limits and also
such that associated curves representing the differentials
of the velocity-time curves with respect to‘ time are sym
metrical about an axis at the midpoint in time between the
time extremes of the velocity-transient portions of such 40
the diameter of the dancer roll is an insigni?cant factor.
FIGURE 2 illustrates a strip processing line which is
in general similar to that illustrated in FIGURE 1-, with
iike reference numerals indicating like elements. FIG
ve1ocity~time curves.
‘
I
URE 2 is intended to illustrate some desirable features
which may be employed in a strip processing line em
bodying [the invention.
The curves shown in FIGURES 3A and 33 represent,
respectively, velocity-time functions and acceleration-time
There is'shown in FIGURE 2, a DC. tachometer
bridge 80 sensing the difference in rotational speed be;
functions for the operations of the apparatus as above de
scribed during an increase in line Velocity‘ and in the case 45 tween the outputs of the speed reducers ‘associated with
motors 24 and 25. Since constant tension is maintained
when time of exposure within the treating chamber ex
on the length of strip between the corresponding pull roll
stands 14 and 18 :by the weight ;W at the stand 17, such
ceeds the time interval during which the line changes
velocity.
.
differences in rotational speed are a measure of the
FIGURES 4A and 4B represent, respectively, these
functions when the time interval during which the line 50 amount of stretch occurring between such pull roll stands.
The output signal from the DC. tachometer bridge 80
changes velocity exceeds the exposure time ‘of the strip
may be fed through line 81 ‘and through control poten
within the treating chamber.
The curves showing strip velocity (vsmp) ‘and reference
tiorneter 82 which controls the motor 45 in substitution
tween the same velocity limits ‘and it is seen in FIGURES
within the chamber 15 upon a sensed decrease in web
for the manuaily operated switch 46 of FIGURE 1. Ac
velocity (vmf) in FIGURES 3A and 4A are reversely
pro?led with respect to each other. The reverse pro?ling 55 cordingly, the position of the dancer roll 40 will be varied
in such a direction to slightly increase exposure time
is established because the curves vsmp and rm extend be
stretch or to slightly decrease exposure time within the
3B and 4B that the strip acceleration (asmp) and the ac
chamber 15 upon ‘a sensed increase in web stretch. It
celeration of the reference means (am) are symmetrical
about an axis at the midpoint in time between the time 60 will be understood that if this feedback control is operat
ing, it will constantly vary the theoretically desirable
extremes of the curves vsmp and 11M.
. v
The curves vsmp and vmf in FIGURES 3A and 4A are
' setting of timing switch 68.
special cases of reverse pro?ling, since they are not only
' reversely pro?led with respect to each other as ‘above de
To prevent factual exposure
time from drifting signi?cantly from the pre-setting of
timing switch 68, there may be provided a divider con
scribed, but their velocity-{transient portions are parallel 65 trol component 83 having as an input factor the rotation
al speed of the ‘drive for the pull roll 72 and as another
input factor a value proportional to the height of the roll
40 within the treating chamber 15. The output of the
ample, FIGURES 5A and 5B represent, respectively,
divider control component 83 is a DC. signal proportion
velocity-time functions and acceleration-time functions for
al to web velocity (rotational rate of pull roll 72) di
the operation of hydraulically, mechanically, ‘or elec 70
to each other.
In its ‘broadest aspects the scope of the
invention is not limited to such a parallelism.
For ex
tronically controlled apparatus in which strip ‘acceleration
varies during velocity transient. FIGURES 5A and 5B
relate to a situation where desired exposure time within
the treating chamber exceeds desired time of strip-velocity 75
vided by the height of the dancer roll 40 in the treating
chamber 15.
In other words, the output of the compo
nent 83 is a measure of exposure time then obtaining on
the strip treating line.
The manually adjusted control 69 of the time delay
-
switch 68 shown in FIGURE 1 maybe replaced by a con
trol potentiometer and motor 85 supplied by the output
of the component 83, through a line 84 so that the time
interval for which the switch 68 is set is continuously re
set to the exposure time then instantaneously obtaining
on the strip processing line so long as the connection
through the line 84 is established.
Another feedback circuit to prevent cumulative errors
8
which have been set forth merely by Way of example
with the intent of most clearly setting forth the teaching
of the invention. Obviously devices may be provided
which change, eliminate or add certain speci?c details
without departing from the invention.
What is claimed is:
1. In continuous and semi-continuous strip treating
apparatus, a treating chamber having port means to re
may be provided in the form of a DC. tachometer bridge
ceive and discharge strip material to be treated within
90 for sensing the difference in rotational speed of the 10 the chamber for a given exposure time, variable speed
pull roll 72 and the reference rotational velocity imparted
to the differential 50 by the motor 29. This difference
may ‘be signaled through an output line 91 to a smaller
control potentiometer, motor and angular-position-ad
justing-linkage all indicated by the reference numeral. 92
drive means for said strip, ?rst roll means mounted for
translation within the chamber, roll means outside the
chamber to guide strip material into an incoming reach
leading to said ?rst roll means and away from an out
going reach leading away from said ?rst roll means,
said ?rst roll means being translatable in a path to vary
and located between the shaft 62 and the rheostat con
trol arm 30. With this arrangement, any cumulative
the length of strip material within the treating chamber,
errors in indicated reference velocity input as supplied by
the motor 29 will be corrected by slight adjustment of
such length being increased when said ?rst roll means
moves in a ?rst direction along said path and such length
the angular position of rheostat control arm 30 so long as 20 being decreased when said ?rst roll means moves in an
opposite second direction along said path, means re
the connection through the line 91 is established.
sponsive to imposition of positive and negative accelera
Switches 87 and 97 may be inserted respectively in the
tion on said variable speed drive means for said strip,
means controlled by said responsive means for translat
the switches 87 and 97 are opened‘ Thus, when the 25 ing said ?rst roll means in said ?rst and second direc
switch 67 is closed as at the ‘beginning of a strip velocity
tions as functions, respectively, of positive and negative
acceleration imposed on said variable speed drive means
transient, the feedback controls of the components 83 and
for said strip, said responsive means and controlled means
90 are deactivated temporarily and for the duration of the
together including means for increasing the translation
strip velocity transient and until such time as the switch
67 is subsequently reopened.
30 velocity of said ?rst roll means as a direct proportion of
departures of strip velocity from the strip velocity prior
It will be understood that within the treating chamber
to the transient until there has elapsed following initiation
15, the dancer roll means may comprise a plurality of
of strip acceleration the shorter of ( 1) said given ex
rolls moving together rather than the single roll 40, and
posure time and (2) the time during which the strip
the movement of guide rolls 41 may be increased to pro
vide for additional reaches into the oven in addition to 35 accelerates, and for then continuing translation of said
?rst roll means at constant translation velocity until the
the two illustrated. This would have the result of increas
longer of said two times expires and then decreasing the
ing the mechanical advantage of the strip or web 10 with
translation velocity of said ?rst roll means as a function
respect to the linkage 43. In the illustrated apparatus,
of time symmetrical to the time-function of said increase
‘with the single dancer roll 40, the slaving relationship of
dancer rolls to strip velocity transients as above discussed 40 in translation velocity of said ?rst roll means.
2. In continuous and semi-continuous strip treating
contemplate a proportion of 2:1 between strip accelera
apparatus, a treating chamber having port means to re
tion and dancer roll acceleration, respectively, and also be
ceive and discharge strip material to be treated within
tween departure of strip velocity from constant velocity
the chamber for a given exposure time, variable speed
and ‘amount of dancer roll velocity, such proportions ap
plying during the shorter of exposure time or strip velocity 45 drive means for said strip, ?rst roll means mounted for
transient time, as previously described. It will be evident,
translation over a continuous range within the chamber
and to a point outside the chamber, roll means outside
however, that when the mechanical advantage of the strip
the chamber to guide strip material into an incoming
10 with respect to the linkage 43 is increased as by in
reach leading to said ?rst roll means and away from an
creasing the number of dancer rolls and reaches within
the chamber 15, such proportion of 2:1 will be corre 50 outgoing reach leading away from said ?rst roll means,
spondingly changed. For example, if the dancer roll
said ?rst roll means being translatable in a path to vary
lines 84 and 91 and may ‘be tied to the switch 67 in the
line 66 in such a manner that when the switch 67 is closed, ,
means comprises two rolls so that there are two incom
the length ‘of strip material within the treating chamber
ing and two outgoing reaches of the strip 10, making a
total of four reaches within the chamber 15, the above
mentioned proportion will be 4:1 rather than 2:1.
through a continuous range starting from zero, such
length being increased when said ?rst roll means moves
It is very desirable to provide a counterbalance roll 35
connected to the linkage 43 in a manner similar to the
dancer roll 40, but for movement in directions opposite
in a ?rst direction along said path and such length being
decreased when said ?rst roll means moves in an oppo
site seoond direction along said path, means responsive
to imposition of positive and ‘negative acceleration on
to the movement of the roll 40. This roll 35 counterbal
said variable speed drive means for said strip, means con
ances the tension on the dancer roll 40 and also frees the 60 trolled by said responsive means for translating said ?rst
remainder of the line downstream thereof ‘from experienc
roll means in ‘said ?rst and second directions as func
ing anything other than the velocity transients imposed
tions, respectively, of positive and negative acceleration
on the pull stand 14.
imposedon said variable speed drive means for said
In a signi?cant aspect of the invention, it is to be
noted that the dancer roll 40‘ is capable of being lowered 65 strip, said responsive means and controlled means to
gether includiing means for increasing the translation
to a point outside the treating chamber 15. For emer
velocity
of said ‘?rst roll means as a direct proportion
gency shut-down applications with the motor 55 set for
of departures of strip velocity from the strip velocity
a suf?ciently high acceleration and with the switches 61
prior to the transient until there has elapsed following
and 64 correspondingly set for a very low web transient
time, the web may be very quickly removed from the 70 initiation of strip acceleration the shorter of (1) said
treating chamber 15 while maintaining uniformity of
‘treatment from increment to increment thereof during
such removal and upon subsequent re-starting of the line.
The invention is not restricted to the slavish imitation
of each and every one of the details described above 75
given exposure time and (2) the time during which the
strip accelerates, and for then continuing translation of
said ?rst roll means at constant translation velocity until
the longer of said two times expires and then decreasing
the translation velocity of said ?rst roll means as a func
3,045,360
,
9
10
tion of time symmetrical to the time-function of said
increase in translation velocity of said ?rst roll means.
3. In continuous and semi-continuous strip treating
translation within the chamber, roll means outside the
chamber to guide strip material into an incoming reach
,
leading to said ?rst roll means and away from an out
apparatus, a treating chamber having port means to re
going reach leading away from said ?rst roll means, said
ceive and discharge strip material to be treated within 5 ?rst roll means being translatable in a path to vary the
the chamber for a given exposure time, variable speed
length of strip material within the treating chamber, speed
drive means for said strip, a dancer roll mounted for
reference means normally referable to strip velocity,
translation within the chamber, roll means outside the
controlled means for responsively varying translation
chamber to guide strip material into an incoming reach
velocity-of said ?rst roll means in said path with refer- _
leading to said dancer roll and away from an outgoing 10 ence to the amount and sign of departure of strip velocity
reach leading away from said dancer roll, said dancer
from reference velocities indicated by said speed reference
roll being translatable in a path to vary the length of
means and a direct proportion of such departure, means
strip material within the treating chamber, such length
being increased when ‘said dancer roll moves in a ?rst
for delaying variation of indicated reference velocity of
said speed reference means following initiation of line
direction along said path and such length being decreased 15 velocity changes, such delay being for an interval equal
when said dancer roll moves in an opposite second direc
tion ‘along said path, means responsive to imposition of
positive and negative acceleration on said variable speed
drive means ‘for said strip, means controlled by said re
to said strip exposure time, and for then varying refer
ence velocity as a time-function reversely pro?led with
respect to that of said departure of strip velocity.
6. In continuous and semi-continuous stn'p treating
sponsive means for translating said dancer roll in said 20 apparatus, a treating chamber having port means to re
?rst and second directions as functions, respectively, of
ceive and discharge strip material to be treated within
positive and negative acceleration imposed on said vari
the chamber for a desired exposure time, variable speed
able speed drive means for said strip, said responsive
drive means for said strip, ?rst roll means mounted for
means and controlled means together including means
translation over a continuous range
the chamber
for increasing the translation velocity of said dancer roll 25 and to a point outside the chamber, roll means outside
as a direct proportion of departures of strip velocity from
the chamber to guide strip material into an incoming
the strip velocity prior to the transient until there has
reach leading to said ?rst roll means and away from an
elapsed following initiation of strip acceleration the
outgoing reach leading away from said ?rst roll means,
shorter of (1) said given exposure time and (2) the time
said ?rst roll means being translatable in a path to vary
during which the strip accelerates, and for then continu 30 the length of strip material within the treating chamber,
ing dancer roll translation at constant translation velocity
speed reference means normally referable to strip velocity,
until the longer of said two times expires and then de
controlled nieans for responsively varying translation ve
creasing the translation velocity of said dancer roll as a
locity of said ?rst roll means in said path with reference to
function of time symmetrical to the time-function of said
the amount ‘and sign of departure of strip velocity from ref
35 erence velocities indicated by said speed reference means
increase in translation velocity of said dancer roll.
4. ‘In continuous and ‘semi-continuous strip treating
apparatus, a treating chamber having port means to re
ceive and discharge strip material to be treated Within
the chamber for a given exposure time, variable speed
and as a direct proportion of such departure, means for
delaying variation of indicated reference velocity of said
speed reference means following initiation of line velocity
changes, such delay being for an interval equal to said
drive means for said strip, a dancer roll mounted for 40 strip exposure time, and for then varying reference ve
translation over a continuous range within the chamber
locity as a time-function reversely pro?led with respect
:and to a point [outside the chamber, roll means outside
the chamber to guide strip material into an incoming
to that of said departure of strip velocity.
7. In continuous and semi-continuous strip treating
reach leading to said dancer roll and [away from an out
apparatus, a treating chamber having port means to re
going reach leading away from said dancer roll, said 45
the
ceivechamber
and discharge
for a desired
strip material
exposure to
time,
be variable
treated speed
dancer roll being translatable in \a path to vary the length
of strip material within the treating chamber through a
drive means for said strip, a dancer roll mounted for
continuous range starting from zero, such length being
translation within the chamber, roll means outside the
increased when said dancer roll moves in a ?rst direc
chamber to guide strip material, into an incoming reach
tion along said path and such length being decreased 50 leading to said dancer roll and away from an outgoing
when said dancer roll moves
an opposite second direc
reach leading away from said dancer roll, said dancer
tion along said path, means responsive to imposition of
roll being translatable in a path ‘to vary the length of
positive and negative acceleration on said variable speed
strip material within the treating chamber, speed refer
drive means for said strip, means controlled by said re
ence means normally referable to strip velocity, con
sponsive means for translating said dancer roll in said 55 trolled means for responsively varying translation velocity
?rst and second directions as functions, respectively, of
of said dancer roll in said path with reference to the
positive and negative acceleration imposed on said vari
amount and sign of departure of strip velocity from ref
able speed drive means for said strip, said responsive
erence velocities indicated by said speed reference means
means and controlled means together including means
and as a direct proportion of such departure, means for
for increasing the translation velocity of said dancer roll 60 delaying variation of indicated reference velocity of said
as a direct proportion of departures of strip velocity
speed reference means following initiation of line velocity
from the strip velocity prior to the transient until there
changes, such delay being for an interval equal to said
has elapsed following initiation of strip acceleration the
strip exposure'time, and for then varying reference ve
shorter of (1) said given exposure time and (2) the time
locity as a time-function reversely pro?led with respect
during which the strip accelerates, and for then continu 65 to that of said departure of strip velocity.
ing dancer roll translation at constant translation velocity
8. In continuous and semi-continuous strip treating
until the longer of said two times expires and then de
apparatus, a treating chamber having port means to re
creasing the translation velocity of said dancer roll as a
ceive and discharge strip material to be treated within‘
function of time symmetrical to ‘the time-function of said
the chamber for ‘a desired exposure time, variable speed
70 drive means ‘for said strip, a dancer roll'mounted for
increase in translation velocity of said dancer roll.
5. In continuous and semi-continuous strip treating
translation over a continuous range within the chamber
apparatus, a treating chamber ‘having port means to re
and to a point outside the chamber, roll means outside
ceive and discharge strip material to be treated within
the chamber for a desired exposure time, variable speed
reach leading to said dancer roll and away from an out
the chamber to guide strip material into an incoming
drive means for said strip, ?rst roll means mounted for 75 going reach leading away from said dancer roll, said‘
3,045,360
1l
12
dancer roll being translatable in a path to vary the length
changes, such delay being for an interval equal to said
strip exposure time, and for ‘then varying reference ve
locity as a ‘time-function reversely pro?led with respect
to that of said departure of strip velocity.
of strip material within/the treating chamber, speed ref
erence means normally referable to strip velocity, con
trolled means for responsively varying ‘translation velocity
of said ‘dancer roll in said path with reference to the Cl
amount and sign of departure of strip velocity from ref
erence velocities indicated by said speed reference means
and as a direct proportion of such ‘departure, means for
> delaying variation of indicated reference velocity of said
speed reference means following initiation of line velocity 10
References Cited in the tile of this patent
UNITED STATES PATENTS
1,673,521
2,837,834
2,998,175
Maas ________________ __ June 112, 1928
Alexeff et a1 ___________ __ June 19, 1958
Topping _____________ __ Aug. 29, 1961
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No“ $045,360
July .24H 1962
Alexander" V. Alexeff et a1‘.
corrected below .
Column 10? line 12, after "and"
insert
—-
as
—~-.,
Signed and sealed this ‘30th day of October 1962.
l
(SEAL)
'
~
Atteat:
ERNEST W. SWIDER
Attesting Officer
‘‘
--DAVID L. LADD
Commissioner of Patents
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