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Патент USA US2412509

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Dec. 10, 1946.
R. MCC. JOHNSTONE
2,412,509
UNWINDING MACHINE
Filed June 13, 1942
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Dec. 10, 1946.
R. we. JOHNSTONE
2,412,509
UNWINDING MACHINE
_ Filed June 13, 1942
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6 Sheets-Sheet 2
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Dec. 10, 1946.
R. we. JOHNSTONE
2,412,509
UNWINDING MACHINE
Filed June 13, 1942
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6 Sheets-Sheet 3
Dec. 10,1946.
R. McC. JOHNSTONE
2,412,509
UNWINDING MACHINE
Filed June 13, 1942 -
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Dec. 10, 1946.
R. MCC. JOHN-STONE
2,412,509
UNWINDING MACHINE
Filed June 13, 1942
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Dec. 10, 1946.
R. MCCI. JOHNSTONE
unwmnme MAC‘HINE
Filed June 13, 1942
2,412,509
,
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6 Sheets-Sheet 6.
66
Patented Dec. 10, 1946
v 2,412,509 ,
‘UNITED STATES PATENT OFFICE
2,412,509
UNWINDING MACHINE
Robert McC. Johnstone, BondsvilleJ’a.
Application June 13, 1942, Serial No. 446,917
5 Claims. (Cl. 242-75)
2
The principal object of this invention is to
provide a novel and highly ef?cient mechanism
for assuring continuous uniform tension on a
web of material as it is being drawn from a
predetermined source, and while the invention is
herein illustrated in connection with an unwind
ing machine, wherein the said source of. the web
is a parent roll from which the web is withdrawn, it will be understood that the mechanism form
ing the subject of the invention is capable of 10
use as a uniform tensioning means in connection
with webs drawn from other sources.
In the attached drawings:
Figure 1 is a view in perspective of an un
winding machine made in accordance with my 15
invention;
1.
_
Fig. 2 is a view in perspective from the opposite
side of the machine shown in Fig. 1;
Fig. 3 is a sectional view as viewed on the line
3—3, Fig. 2;
dium of a hand wheel 9 so as to afford a. means
for aligning the shaft 3 in the frame. The jour
nal 8, as best' shown in Figs. 4 and 5. is of the
split type and comprises a bottom portion ||
which receives the shaft 3, and a top or cap por
tion H which is hinged on the frame and which
may be adjusted between a retracted position, as
shown in Fig. 4, and an advanced position, as
shown in Fig. 5, wherein the said cap portion
engages the top of the shaft and thus retains it
in the member ||. The cap I2 is provided with
a pivoted latch I3 which when the cap is in the
operative position is adapted to pass under the
shoulder ll of the journal member || so as to
lock the cap |2 in the operative position.
‘ The shaft 3 is provided with spaced collars |5,
20 |5 which may be adjusted to abut the opposite
Figs. 4 and 5 are fragmentary views in per
spective of the portion of the machine shown at
the extreme right in Figs. 2 and 3;
ends of the journal cap l2 when the latter occu
pies the operative position, as shown in Fig. 3,
and the hinge pin It for, the cap I2 is in the
Fig. 6 is a sectional view on the line i—5,
Fig. 5;
More speci?cally, the shaft 3 of the parent roll
2 is supported in the frame in journals '_| and 3,
the journal 1 being adjustable through the me
form of a worm or a screw havingthreaded en
25 gagement with the cap structure and being
.
mounted for rotation in lugs l1, IT on the journal
Figs. 7 and 8 are sectional views on the lines
1-1 and 8-8, respectively, of Fig. 6;
bracket l8. A spiral gear I9 is secured to’ one
end of the worm l6, and this gear meshes with
a second spiral gear 2| which is suitably mounted
justment;
30 for rotation in the bracket l8 and which may
Fig. 10 is an enlarged vertical sectional view
be turned through the medium of a hand wheel
through the braking mechanism shown at the
22, see Fig. 1. This provides for adjustmentof
extreme right-hand end of Fig. 3 but viewed from
the journal cap l2 axially of the shaft 3, and
through the medium of the collars l5, l5 for a
the opposite direction;
~ ‘
Fig. 11 is a section on the line ||--| I, Fig. 10;
corresponding axial adjustment of the shaft and
Fig. 9 is a sectional view corresponding to Fig.
7 showing the parts in a different position of ad
.
.
.
.
12 is a section on the line |2-|2, Fig. 3;
13 is a section on the line |3—|3,' Fig. 12;
14 is a section on the line H-ll, Fig. 3;
of the parent roll 2 in the frame.
_
The brake 4 is best shown in Figs. 3, l0 and 11.
As shown in Fig. 3, the entire brake structure is
supported upon a bracket 23 secured to one end
15 is a section on the line |5-|5, Fig. 3,
40 of the frame, and the outer face 24 of this bracket
.16 is a section on the line lS-Ii, Fig. 15.
forms one of the friction surfaces against which
The machine disclosed in the drawings as an
a rotary brake disk 25, which is connected to the
embodiment of my invention consists essentially
shaft 3 by means hereinafter described, operates
of a frame I having means for rotatably support
in the braking function. This disk 25, as best
ing a parent roll 2 and the shaft '3 to which 45 shown in Fig. 10, has a splined connection with
this roll is secured; a. means for retarding the
a shaft 25, the splines 21 extending to a sleeve
28 in which the shaft 26 is longitudinally adjust
rotation of the roll 2, said means taking the form,
able. This sleeve is journaled on anti-friction
in the present instance, of a friction brake I; a
so-called nerve roll 5 which operates in a loop
bearings 29 in the bracket 23, and the shaft 26
of the traveling web 6 as the latter is drawn from 50 extends from the sleeve towards the adjoining -'
end of the shaft 3 to which it may be coupled
the parent roll 2 and which is sensitive to the
' pull of the web and is tensioned by suitable means
by means hereinafter described,
The brake member 4 further comprises a plate
against the pull; and a highly sensitive means,
hereinafter described, for operatively connecting
3| which is supported on bolts 32, secured in and
projecting from the bracket 23, for sliding move
the nerve roll with an actuating means for the .
brake whereby displacement of the nerve roll due
ment to and from the face 24 of thebracket. The
face 33- of theiplate 3| is adapted to frictionally
to variations in the tension in the web will auto
engagethe adjacent-side of the rotary disk 25,
matically actuate the brake to thereby modify
and means is provided for confining the disk un—_
the tension as may be required to maintain it
substantially constant.
‘
60
der variable pressure between the plate 3| \and
2,412,509
3
the friction surface 24 of the bracket 23. Coiled
springs 34 are supported on the bolts 32 between
the opposed faces of thebracket 23 and the plate
3| and exert pressure tending to move the plate
3| away from the disk 25.
Supported on the
and the sleeve 54 then rotated with respect to
the shaft 3, or vice versa, the beveled surfaces
53 will permit the tongue 52 to assume the rela
tive position in the sleeve shown in Fig. 9, wherein
the corners of the outer unbeveled portion of the
outer ends of the bolts 32 is a yoke 35, and Jour
naled in this yoke is a shaft 36, to one end of
tongue will overlap and will lie behind the steel
inserts 56, thereby locking the sleeve on the shaft.
this ring is adapted to engage one end of a screw
42 threaded centrally into the plate 3|. - It will
’ 26 is provided with a projecting tongue 6| which
The other end of the sleeve 54 is provided with
which is secured a lever 31 and which carries in
a cylindrical opening 53, the outer end of which
termediate the sides of the yoke 35, as shown in
Fig. 11, a cam 33, see also Fig. 3. Embracing the 10 is intersected at two sides by hardened steel in
serts 53, 59 of the same character as the inserts
periphery of the cam and supported thereon by
56 and similarly, securedin the sleeve. The shaft
anti-friction bearings 33 is a contact ring 4|, and
be apparent from the foregoing description that
actuation of the lever 31 and consequent rotation
of the shaft 36 will cause the cam 38 either to
advance the plate 3| toward the frictional surface
24 of the bracket 23 and against the pressure of
the springs 34, or will release the plate so as to
.is ?attened at its opposite sides to permit of its
insertion into the opening 53 between the inserts
53, and a cylindrical head element 62 is secured
to the end of the tongue 6| after insertion so
as to lock the shaft 26 in the sleeve 54, It will
be noted that since the shaft 26 is free-for axial
20 movement in the bracket 23, axial adjustment
> of the shaft 3, as previously described, will not
affect the coupled relationship of the said shafts.
the surface 24 and the brake disk 25. It will be
In passing from the parent roll 2 to the nerve
noted that the screw 42 has secured thereto, by
' roll 5, the web 6 passes around an idler pulley
suitable means, a lever 43 by means of which this
screw may be turned in the plate 3| to adjust 25 63 which is suitably journaled in the frame I..
The nerve roll 5 is joumaled on anti-friction
it longitudinally in the latter.
*
\
Pivotally connected at 44 to. the lever 31 is a ‘ . bearings 64' for free rotation upon a shaft 65, an
this shaft mounts rollers 66 which travel on
second lever 45. One end 46 of this lever extends
tracks 61 on the frame. Anti-friction bearings
into proximity to one side of the upper end of
the lever 31, and a spring 41 is suitably supported 30 68 are also interposed between the rollers 66
and the shaft. This provides for free rotational
between the end 46-of the one lever and the op
movement of the roller 5, and also for transla
posed side of the lever 31. The other end 43 of
tional movement of this roller in the frame and
the lever 45 is connected to a “sylphon” bellows
with respect to the relatively ?xed idler roller 63.
43. This end of the lever 45 is also engaged bya
Secured to each end of the shaft 65 is a pinion
transversely projecting?ange 5|. at the free end 35
69, and each of these pinions meshes with a rack
of the lever 31, and this ?ange 5| is normally
10 secured to the frame. These pinions and
held against the side of the lever'45 by pressure
permit the springs 34 to retract the plate from
theirracks function to maintain the shaft 65
of the spring 41. With this arrangement, the
and the roll 5 continuously in parallel relation
spring 41, which may be calibrated as required,
controls the maximum force which may be ap 40 with the idler roll 63. Secured to one end of the
' shaft, see Fig. 16, is a second pinion 1|, and this
plied, through the lever assembly and the cam 38
pinion meshes with a rack 12 which is slidably
against the screw 42, and thereby also controls
supported in suitable guides 13 in the frame, see
the maximum pressure that may be exerted upon
Fig. 15, and which is secured at one end to a
the brake disk 25 between the friction surfaces
"sylphon” bellows 14, this bellows being opera
33 and 24. In other words-when the lever 45 is
tively connected through a suitable duct 15 with
moved in a clockwise direction by expansion of
the “sylphon” 49, which as previously described
the “sylphon” 49, see Fig. 10, thereby to increase
is operatively associated with the brake device
the pressure upon the disk 25, the force applied
4. The pinion 1| is somewhat smaller than the
to the plate 3| through the cam 33 will increase
only to a point where the calibrated spring 41 will 50. pinions 63 so that any movement of the shaft
65 on the rails 61 will result in a longitudinal
yield. If at any time it is desired to release the
displacement of the rack 12 of a predetermined
brake 25 independently of the lever system 31-45
order. This displacement ofthe rack 12 will be
and the associated actuating mechanism, this
transmitted through the hydraulic system, com
can be done by an adjustment of the screw 42
posed of the “sylphons” 49 and 14 and their
through the lever 43.
connecting duct 15, to the brake 4, with a result
The shaft 26 is coupled to the shaft 3 by a
ing actuation of the latter.
coupling device best illustrated in Figs. 6 to 9,
Supported on anti-friction bearings 16 on one
inclusive. As therein shown, the ‘end of the shaft
end of the shaft 65, see Fig. 13, is a roller 11, and
3 is flattened at opposite sides to provide a ter
minal tongue 52. The longitudinal edges of the 60 to the roller 11 is attached a cable 18 which ex
tends, in parallel relation to the guide rails 51,
tongue within the area where the tongue ad
to a horizontal sheave 19 supported on the frame,
joins the body of the shaft are beveled, as indi
and thence to a vertical sheave 8|, also supported
cated at 53. Engaged with the tongue 52 is a
sleeve 54, this sleeve having at one end a slotted
on the frame.
The free depending end of the
cable 18 supports a weight 82 which constitutes
a predetermined load on the nerve'roll 5, tending
site sides of this slot are formed by a pair of
to pull this roll against the loop of the web
hardened steel inserts 56, 56 which are set into
6. Adjustment of the weight controls the amount
the outer end of the sleeve 54, as best shown in '
of tension in the web, as will hereinafter appear.
Figs. 7 and 9, and which are secured in place pref
erably by means of welding. As shown in Fig. 6, 70 Obviously the weight 82 may be replaced by a
spring or other suitable means,,preferably vari
the plates do not extend to the bottom of the
' able, for loading the nerve roll.
recess 55, and the inner end 51 of this recess is
The ‘operation of the device will be apparent
cylindrical in form, as indicated by the broken
from the foregoing description. Any variation in
lines in Figs. 7 and 8. When the tongue 52 is
fully inserted in the recess 55, as shown in Fig. 6, 75 the tension of the web 6 immediately affects the
recess>55 for reception of the tongue 52. Oppo
2,412,509
6
nerve roll 5 and will be accompanied by a trans
translated into compensating adjustments of the
lational movement of this roll. If the tension in
drag.
the web decreases for example, the nerve roll 5
3. In an unwinding machine of the type com
under the action of the weight 82 will tend to
prising a journal support for a parent roll, a
move toward the right, as viewed in Figs. 2 and
brake operatively associated with said roll and a
15, and this movement of the roll will result in
?oating element engaged with the strip and sen
a movement toward the right, as viewed in the
sitive to variations in tension in the strip; said
latter ?gure, of the rack 12. The resulting con
brake comprising an adjustable member for im
traction of the “sylphon” 14 will in turn effect
a corresponding expansion of the "sylphon” 49 10 posing a variable drag on the roll opposing with
drawal of the strip material from the latter, a
and a movement of the lever 45 in a clockwise
cam for actuating said member to increase the
direction, as viewed in Fig. 10. This will cause
drag, resilient means operating in opposition to
a movement of the cam 38 in a direction to in
the cam and tending to reduce the drag, actuat
crease the pressure on the plate 3|, and will
thereby increase the frictional drag on the brake 15 ing means for the cam, and hydraulic means for
transmitting impulses from the said element to
disk 25. This increased drag on the parent roll
the actuating means whereby changes in tension
2' will cause an increase in the tension in the
in the strip detected by the element may be trans
web, thus compensating for the original loss
lated into compensating adjustments of the brake,
of tension. If for any reason the tension of
the web should increase, the device will operate 20 said cam actuator including means for limiting
the amount of force imposed upon the cam by said
in the opposite phase to decrease the retarding
hydraulic means.
action of the brake on the parent roll.
4. In an unwinding machine of the type com
By reason of the use of the hydraulic system,
prising
a journal support for a parent roll, a brake
the differential racks, and lever and cam ele
ments in the transmission link between the nerve 25 operatively associated with said roll, and a ?oat
ing element engaged with the strip and sensitive
roll 5 and friction brake 4, the device is highly
to variations in tension ‘in the strip; said brake
sensitive in reacting to and compensating varia
comprising an adjustable member for imposing
tions in web tension, and is highly efficient in
a variable drag on the roll opposing withdrawal
maintaining a substantially uniform tension in
of the strip material from the latter, a cam for
the web.
30 actuating said said member to increase the drag,
I claim:
resilient means operating in opposition to the
1. In a machine for maintaining uniform ten
cam and tending to reduce the drag, actuating
sion in a traveling strip, means for imposing a
means for the cam, said means including a lever
drag on the strip, said means being adjustable to
connected
to the cam, a second lever pivotally
vary said drag and to thereby regulate the ten 35
connected to the lever first named, resilient means
sion, a ?oating nerve roll arranged for engage
interposed between said levers, stop means for
ment with the strip, a shaft constituting a. jour
holding said levers normally in predetermined rel
nal support for said roll, and means for tension
ative
position against the tension of said spring,
ing said nerve roll so as to exert a force on the
and hydraulic means connected with the second
strip tending to de?ect it from a normal path, 40 named
lever for transmitting impulses from the
guide means for said roll including a pinion se
said
element
to the brake whereby changes in
cured to the roll shaft and a relatively ?xed rack
tension
in
the
strip detected by the element may
engaging said pinion, a second pinion of differ
be translated into compensating adjustments of
ing diameter than the pinion ?rst named and sim
the brake, said levers being arranged to move as
ilarly secured to the roll shaft, a rack engaged
a
unit until the force applied to the lever by said
with said second pinion and supported for longi
hydraulic means is suiiicient ,to overcome the
tudinal movement'with respect to the ?rst-named
tension of said spring, movement of the ?rst
rack, and hydraulic means operatively connect
named lever being terminated by contraction of
ing the said relatively movable rack with the drag
the spring.
means whereby changes in tension in the strip 50. 5. In a machine for maintaining uniform ten
detected by the roll may be translated into com
sion in a traveling strip, means for imposing a
pensating adjustments of the drag.
drag on thestrip, said means being adjustable to
2. In a machine for maintaining uniform ten
vary
said drag and to thereby regulate the ten
sion in a traveling strip, means for imposing a
sion,
a ?oating nerve roll arranged for engage
drag on the strip, said means being adjustable 55
ment with the strip, and means for tensioning
to vary said drag and to thereby regulate the
said nerve roll so as to exert a force on the strip
tension, a ?oating nerve roll arrangement for en
tending
to de?ect it from a normal path, a roll
gagement with the strip, and means for tension
supporting shaft upon which the said roll is jour
ing said nerve roll so as to exert a force on the
strip tending to de?ect it from a normal path, a 60 naled, guide means for said roll including a pinion
secured to the roll shaft and a relatively ?xed
supporting shaft upon which the said nerve roll
rack engaging said pinion, a second pinion of dif
is journaled, guide means for said r011 including a
fering diameter than the pinion ?rst named and
pinion secured to each end of said shaft and a
similarly secured to the roll shaft, a rack en
relatively ?xed rack engaging said pinion, a sec
gaged with said second pinion and supported for
ond pinion of differing diameter than the pin 65 longitudinal
movement with respect to the ?rst
named rack, and means operatively connecting
the said relatively movable rack with the drag
supported for longitudinal movement with respect
means whereby changes in the tension in the strip
to the ?rst-named racks, and hydraulic means
detected by the roll may be translated into com
operatively connecting the said relatively mov 70 pensating
adjustment of the drag.
able rack with the drag means whereby changes
in tension in the strip detected by the roll may be
ROBERT MCC. J OHNSTONE.
ions ?rst named and similarly secured to the
shaft, a, rack engaged with said second pinion and
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