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Патент USA US3083414

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April 2, 1963
R. I. LUND
3,083,404
MIXING MILL ACCUMULATING SHELF
Filed Feb. 8. 1962
2 Sheets-Sheet 1
Z
INVENTOR.
RICHARD I. LUND
if?)
April 2, 1963
R. I. LUND
MIXING MILL ACCUMULATING SHELF
3,083,404
Filed Feb. 8, 1962
2 Sheets-sheaf 2
1/49
/63
62
.
INVENTOR.
RICHARD I. LUND
50
66
BY
ATTY.
United States Patent 0 M
1
3,683,404
Patented Apr. 2, 196-3
2
apparatus in combination'with a roll mill having an over
3,083,494
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__
head mixer whereby all portions of ‘an elastomeric batch
MIXING MILL ACQUMULATlNG SHELF
Richard I. Lurid, Akron, Ohio, assignor to The B. F.
Goodrich Company, New York, N.Y., a corporation of
New York
Fiied Feb. 3, 1962, Ser. No. 171,889
6 Ciaims. (Ci. 18—2)
head mixer wherein means are provided to accumulate
This invention pertains to apparatus for mixing plastic
materials,‘ and, more particularly, toimprovements in vroll
a portion of an elastomeric batch being mixed thereon
above and out of contact with the rollers of said mill
being mixed on said mill are intimately mixed with one
another.
It is a further object‘of this invention to provide an
apparatus'in combination with a roll mill having an'ove'r
before allowing said portion to pass between'said rolls.
mills for the mixing of elastomeric materials.
It is a‘ still further object of'this invention to provide an
apparatus as described in the preceding paragraph wherein
In the mixing of elastomeric materials it is common
practice to blend compounding ingredients into a rubber
matrix-on a roll mill having a pair of closely adjustably
said means to accumulate a portion of the batch comprises
a horizontal batch accumulating shelf mounted beneath
spaced, horizontal, parallel ‘and contra-rotating milling
15 the overhead mixer for'movementin-horizontal directions.
It is a still further object’ of the present invention to pro
speed than'the other, in the order of 40% ‘greater, thereby
rolls. In such a mill, one of the rolls is rotated-at a higher
vide an apparatus as-described in the preceding paragraph
subjecting material passing through the bight of such rolls
wherein the'horizontal movement of s'aidshelf is effected
in timed‘relationship to the speed of rotation of the over
head mixing rolls.
Further objects and advantages to be gained'through the
to shearing forces which act to disperse the compounding
ingredients uniformly throughout the rubber. The ma
terial passing'through the bight’ forms a'continuous band
on one of the two rolls, generally the slower of'the two.
use of the present'invention will be apparent to those
skilled in the art to which it pertains from the following
terial forms a rolling bank above the bight of the rolls. 25 detailed description of a vpreferred embodiment of the
apparatus and from the drawings which form a part of
In order to more uniformly mix the batch and allow the
this-application and in which:
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bank to pass between the rolls the operator cuts the band
FIG. 1 is a front elevational view of a rollmill with
from side to side with aknife held in'his one hand, while
overhead mixer in combination with the movable 'stock
rolling the material out with the other hand until the
accumulating shelf;
The volume of the batch being mixed is preferably greater
than that needed to form this band, and the excess ma
rolling bank is nearly completely passed between the
rolls, at which time he allows the roll he has formed by
hand to be caught in the bight to again form a band. At
best, this operation is di?icult, time consuming and ex
tremely dangerous to the operator.
30
FIG. 2 is a cross-sectional side elevational View of the
apparatus taken along‘line 2-42 of FIG. 1; and
'FIG. 3 is a schematic diagram'of the electrical and
pneumatic circuits for controlling movement of the stock
accumulating shelf.
In order to facilitate the mixing of the'band from side 35
The stock accumulating shelf assembly A‘ of the present
to side such mills have been furnished with overhead
invention is illustrated in'the drawings as it is used in
mixers comprising a pair of rolls’located above the mill
conjunction with a conventional two-roll mixing mill B,
rolls and parallel‘the'reto. One of'these rolls is driven in
?tted with an overhead mixer ‘C. The-mill B c-omprises'a
timed relationship to 'the speed of the ‘mill rolls. The
operator can cut the entire band from its mill roll and 40 pair of vertical side supports 10 in which a pair of milling
rolls 11 and 12, having supporting shafts 13'and 13a, are
throw it up to the bight of the overhead mixing rolls which
journalled. A spur gear 14 is mounted onone end of
pull the entire band up and dump it into the bight of the
shaft 13 for roll '11 and is engaged with a similar gear
mill rolls. This, in'effect, lengthens the band of rubber,
15~mountedon the shaft '13:: for roll 12. A third ‘spur
thereby reducing the size of the rolling'bank over the mill
rolls. In addition, a guide carriage is provided in front 45 gear 16, mounted on a drive shaft 17, is in driving engage
ment with gear 14, thus causing rolls 1'1 and 12 to rotate
of the overhead mixing rolls. This carriage travels in
in'oppositea’directions as ‘drive shaft -17, connected to a
source of power not shown, ‘is rotated. When rotated
double reversing screw rotated in timed relationship to
as shown in the drawings, the rolls 11 and‘liz draw a band
the rotational speed of the mill rolls. The carriage guides
the rubber band to the overhead mixer rolls and auto 50 18 of elastomeric material ‘from 1a rolling bank 19‘ ‘of
the material through the bight of the rolls.
matically performs an operation similar to that of the
'The overhead mixing'assenibly 7C comprises a pair of
operator in cutting the band from side to side.
side support members $24) each'mounted on one off the
In the use‘ of'such equipment, particularly in conjunc
vertical side supports '10 ofthe mill B. A- drawing roller
tion with internal mixers of the Banbury type, where the
size of the batch being-mixed is large,‘in'the order of 400 55 21 is mounted on a ‘shaft '22 ro-tatably journalled between
supports 20. A second drawing roller 23 is mounted on
pounds or more, it is‘impossible to completely eliminate
a shaft 124 rotatably journalled between a 'pairof pivot
the rolling bank of material above the mill rolls‘ bight.
arms 2-5 eachp-ivotally mounted on supports 20. Shaft
The band of material being carried to the bight of the
22 is rotated'by means of a chain'26 passing about a
mill rolls by the overhead rolls tends to pass under this
directions parallel'to the axes of‘th'e rolls on an endless
rolling bank and through the bight of the mill rolls again. 60 sprocket 27 on shaft ZZ-and a 1sprocket$28~ on the output
shaft of a variable speed reducer :29 ‘which is driven by
Therefore, the material in the rolling bank does ‘not be
a-motor 30. As the roller 321 is driven in the direction
come intimately mixed with the rest of the material with
indicated in the ‘drawings, the'band-18- ofelastomeric ma
the result that the rest of the material is continually passed
terial is drawn between the rollers 21*and'23. Roller v23
between the mill rolls to become overheated and possibly
65 is urged against‘the‘band -18>by theiforce-‘of gravity. A
scorched or otherwise have its properties deteriorated.
In an effort to overcome'this'serious drawback in the
milling of large rubber batches it became encumbent upon
screw member 31 is mounted on a shaft 32 which is rotat~
ably journalled between side supports 20, Screw mem
ber 31 is rotated in response-to ‘rotation of roller 21 by
those concerned with the problem'to devise an apparatus
means of laschain 33 trained about sprockets'34'and ‘35
which would insure complete and'intimate mixing of all
portions of a batch being mixed thereon.
70 mounted on shafts <22 and 32, respectively. Mounted be
tween supports Zti, and parallelto screw member 31, is a
It is an object of this invention therefore, to provide an
guide rod 36. Slidably-mounted on guide rod 136 is a
3,083,404
3
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screw follower member 37 engaged with an endless dou
ble reversing screw thread 38, formed in screw member
31, for movement in alternating opposite directions as
screw member 31 is rotated. Rotatably mounted on the
front of member 37 is a horizontal roller 39‘ by which
the band 18 of elastomeric material is supported as it is
drawn upward by the rollers 21 and 23. A pair of hori
zontal parallel rollers ‘40, each mounted on one of a pair
of brackets 41 mounted on member 37, guide the lateral
movement of the band 18 as member 37 moves from
side to side.
The stock accumulating shaft assembly A includes a
4
line 66. As member 37 moves to the right ‘as viewed in
FIG. 1, the band 18 again accumulates on shelf 43 to
diminish the rolling bank 19. As member 37 approaches
the extreme of its travel in this direction ?nger ‘53 con
tacts limit switch 51 to repeat the dumping cycle.
In the mixing of greater amounts of elastorneric ma
terial is may be necessary or desirable to allow member
37 to move the entire length of its travel and return be
fore causing actuation of the accumulating assembly A,
thus decreasing the size of the rolling bank ‘19 to a mini
mum. To accomplish this, either of the limit switches
51 or 52 may be removed from the circuit shown in
PEG. 3. Thus, solenoid coil 57 would be actuated by
but one of the ?ngers ‘53 or 54 on follower member 37.
each mounted on the inner side of side supports 20‘ below
The invention has been described with respect to one
the drawing rolls 21 and 23 ‘and screw member 31. A 15
speci?c
embodiment thereof as incorporated in a two
rectangular shelf 43, formed of a front angle member 44
roll mixing mill. It will be apparent to those skilled in
and rear angle member 45 which support a horizontal
plate 46, is slidably mounted in guide members 42. Also ' the art to which it pertains however, that adaptations
and modi?cations of the apparatus may readily be made
mounted on the inner sides of side supports 21! are a pair
and hence the invention is not limited to the construc—
of double acting air cylinders 47, each having a piston
tional details herein illustrated and described except as
48 and piston rod 49. The outer end of each piston rod
required by the spirit and scope of the appended claims.
49 is mounted on rear angle member 45 to thereby move
Having thus described the invention, I claim:
shelf 43 as pistons 48 are moved in cylinders 417 by air
1. Apparatus for increasing the uniformity of mixing
directed thereto by a four-way spring return valve 50.
Valve ‘59 is actuated in response to the contact of either 25 of elastomeric material comprising, in combination with
a roller mill having a pair of mixing rolls and an over
of a pair of limit switches 51 and 52, mounted on side
head mixer, a movably mounted material accumulating
supports 20, by tripping ?ngers 53 and 54, respectively,
member normally in position to receive said material as
which are mounted on the under side of screw follower
it passes from said overhead mixer; and means to move
member 37. Operation of the apparatus will be more
pair of horizontal parallel channel guide members 42
clearly understood from the operating description which
follows:
Machine Operation
In the use of the shelf assembly A in cooperation with
a roll mill B to uniformly mix elastomeric materials, the
operator cuts the band ‘18 as it passes about mill roll 11
and throws the end of the band 18 over the horizontal
roller 39 of the overhead mixer C, between the parallel
rollers 40, to the bight of the drawing rollers 21 and 23.
The accumulating shelf is normally in the position shown
in full line in FIG. 2, thereby interrupting the return of
said accumulating member from said position thereby
allowing said material accumulated thereon to drop onto
said mixing rolls.
2. Apparatus for increasing the uniformity of mixing
of elastorncric material comprising, in combination with
a roller mill having at least two mixing rolls and an over
head mixer; a material accumulating shelf movably
mounted on said apparatus beneath said overhead mixer
and above said mixing rolls; and means to move said
shelf to and from a position for accumulating said ma
terial as it passes from said overhead mixer.
3. Apparatus for uniformly mixing elastomeric ma
terial comprising at least two parallel adjacent rolls for
the band 18 to the rolling bank 19 of material above the
bight of the milling rolls 11 and 12. The operator then
adjusts the speed of drawing roller 21 to at least match
that of the milling roll 11 by means ‘of an adjusting
handle 55 ‘for the variable speed reducer 29‘. Thus, the
band 18 is pulled directly from milling roll 11 by draw
ing rollers 21 and 23 without troublesome bagging or
sagging. Screw member 31 turning in response to rota-p
receiving and milling elastomeric material therebetween,
tion of roller 21 causes follower member 37 to move
from side to side distributing the band 18 over the width
of shelf 43 in a folded or rolled condition, as at 56. As
member 37 moves to ‘the left as viewed in FIG. 1, ?nger
path for periodically moving said material accumulating
54 trips limit switch ‘52 causing electrical current to ?ow
of elastomeric material on a roller mill having at least
two mixing rolls and an overhead mixer, comprising a
means for receiving the elastomeric material after pas
sage between said rolls and for directing it through a path
spaced from said rolls for repassage therebetween, ma
terial accumulating means selectively positionable in said
path to temporarily prevent passage of material to said
rolls, and means responsive to passage of material in said
means to and from its material passage preventing posi
tion.
.
4. Apparatus for improving the uniformity of mixing
in a solenoid coil 57. Energization of coil 57 causes a
piston rod 58 of valve 150 and its pistons 59 to move to
horizontal material accumulating shelf, means slidably
their positions shown in phantom in FIG. 3 against the
force of piston return spring 60. Air from supply line
mounting said shelf on said apparatus for movement in
a plane disposed between said overhead mixer and said
61 thus ?ows ‘through valve '50 and line 62 to one side
of pistons 48 of cylinders 47, causing pistons 48 and shelf
43 to move to their positions shown in phantom in FIGS.
2 and 3, air from the opposite side of pistons 48 being
exhausted through line 63 and valve 51) to exhaust line
64. As shelf 43 is so moved, a scraper member 65,
rigidly mounted between side supports 20, causes the
material at 56 to be scraped from the shelf onto the bight
of the milling rolls 11 and 12. As member 37 reverses
its direction ?nger 54 disengages limit switch 52 inter
rupting current to solenoid coil 57 and allowing piston
rod 58 and pistons 59 of valve 50 to be returned to their
positions shown in ‘full line in FIG. 3. Air ‘from supply
line 61 is thus directed through line 63 to move the pis
tons 48 of cylinders 47 and shelf 43 to their positions
shown in full line in FIGS. 2 and v3, air being exhausted
mixing rolls, means to move said shelf to and from a
position for receiving said material as it passes from said
overhead mixer, and means to dislodge said material from
said shelf as said shelf is moved from said position there
by allowing said material to be dumped onto said mixing
rolls.
5. In an apparatus for improving the uniformity of
mixing of elastomeric material on a roller mill having at
least two contra-rotating mixing rolls, and an overhead
mixer including a pair of material drawing rolls, an end
less double reversing screw rotated in timed relationship
70 to the speed of rotation of said mixing rolls, and a ma
from cylinders 47 through lim} -_52 and valve 50 to exhaust 75
terial guide carriage mov-ably engaged with said reversing
screw to move said carriage in alternating opposite direc
tions as said reversing screw is rotated; the improvement
comprising a material accumulating shelf, means mount
5
ing said shelf on said apparatus for movement in a hori- '
zontal plane disposed between said drawing rollers and
said mixing rolls, motive means operable to move said
shelf to and from a position for receiving said material
passing from said drawing rollers, means responsive to
movement of said guide carriage in at least one direction
to operate said motive means, and means to dislodge said
material from said shelf as said shelf is moved from said
6
ment in a horizontal plane disposed between said rolls
and said rollers, motive means operable to move said
shelf in said plane to and from a position for interrupting
the passage of material passing from said rollers to said
rolls, means to rotate said rolls in opposite directions to
one another, means to rotate at least one of said rollers at
a peripheral speed at least equal to the peripheral speed
position thereby allowing said material to fall onto said
of said rolls, means responsive to rotation of said rollers
mounted on said apparatus in generally axially parallel
relationship, at least two material drawing rollers mov
means to scrape said material from said shelf as the latter
moves from said position.
ably mounted on said apparatus, an endless double re
References Cited in the ?le of this patent
UNITED STATES PATENTS
to rotate said screw, means mounted on said apparatus
mixing rolls.
adjacent at least one end of said screw engageable with
10
‘6. Apparatus for uniformly mixing elastomeric mate
said guide carriage to operate said motive means, and
rial, comprising at least two material mixing rolls movably
versing screw rotatably mounted on said apparatus adja 15
cent to said rollers and axially parallel thereto, a mate
rial guide carriage movably mounted on and engaged With
said screw to move axially of said screw in alternating
opposite directions as said screw is rotated and to guide
material from said rolls to said rollers, a material accumu 20
lation shelf slidably mounted on said apparatus for move
1,736,582
‘1,397,961
2,593,282
2,973,549
Davidson ____________ __ NOV. 19, 1929
Snyder ______________ __ Feb. 14, 1933
Engler ______________ __ Apr. 15, 1952
Hurst ________________ __ Mar. 7, ‘1961
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