IMPROVEMENTS IN ROLLER MILLS
Year: 1883

page_text: LETTERS PATENT to Alfred Julius Boult of 323 High Holborn in the County
of Middlesex for an Invention of "IMPROVEMENTS IN ROLLER MILLS" A com-
munication to him from Henry Jerome Gilbert of Dayton in the county of
Montgomery and state of Ohio in the United States of America
COMPLETE SPECIFICATION filed by the said Alfred Julius Boult at the
Office of the Commissioners of Patents on the 24th April 1883.
"
ALFRED JULIUS BOULT of 323 High Holborn in the county of Middlesex
"IMPROVEMENTS IN ROLLER MILLS A communication to me from abroad by
Henry Jerome Gilbert of Dayton in the county of Montgomery and state of
Ohio in the United States of America
My invention relates to roller mills for grinding grain. The first part of my
invention consists in certain devices for ridding the stock of its pfluff while on its
way from the tail of each sieve to the next grinding rolls and the second part
consists in certain devices for adjusting the fast rolls to and from the slow rolls.
In the drawing, Figure 1 is a vertical section through a portion of a mill
embodying my improvements, Figure 2 is a top or plan view of the same and
Figures 3, 4 and 5 and 6 are details of my improvements. My device applies to
any style of roller mill A is the frame of the mill and may be of any well known
construction. B are the fast rolls and B₁ the slow rolls. Care pipes that
extend over the adjacent faces of each pair of rolls and are connected at one end by
pipes C with a fan blower D which is suspended over the mill; the other end of
each of the pipes C may carry a sliding gate 6 by which the draft through it may
be regulated. The face of each pipe C is slotted to form a communication along
its entire length with a hopper E which is formed with a channel that leads from
the pipe out over the adjacent faces of a pair of the grinding rolls and then down
between them and also has a flange c for guiding the pfluff from the sieve in
through a passage f and another deflector above for preventing the pfluff from
flying over and behind the pipe so that all of the stock must pass through the
hopper on its way to the rolls and be subjected to the draft made by the fan
blower through pipes C C¹. The end of each of the pipes C opposite that which
opens into pipe C₁ has a port that leads to the open air and has guides a a that
receive a sliding gate 6 Fig. 6 and by raising or lowering this gate, I may regulate
the draft in each pipe. The guides a a may be so arranged that the gate may
n
27

page_text: slide horizontally if desired or any other form of draft regulating device may be
substituted for the gate without departing from the spirit of my invention. To
regulate the distance of the rolls of each pair from each other and yet permit them
to separate when a foreign body is fed between them the following is provided.
As is usually the case in this class of mills the fast rollers B have their bearings in
the upper ends of swinging arms B' while the slow rollers have stationary
bearings B³. The arms B³ pass down through slots in the cross bars A¹ of the mill
frame and these arms are pivoted upon short shafts G that fit in round openings
in the cross bars A². The arms B³ on each side of my mill are connected with
each other by other arms M rods N¹ and long shafts H and each of these shafts
carries between jaws g in the lower ends of arms B2 an excentric H' about which
is fitted the eye of a screw bolt H and the shank h of this bolt H2 is screwed into
the shouldered end of a shaft K that passes through a sleeve K¹ that fits loosely in
a housing K³. The sleeve K¹ has a square shoulder k on its inner end that fits in
a corresponding depression in the inner face of a corner upright of the machine
From its shoulder e outward the
and also has a screw thread on its outer end.
housing K' is made of sufficient diameter to permit a spiral spring L to be slipped
in on the sleeve K' and this spring is confined in place by a washer m and nut m¹
and upon the end of shaft K that projects through the sleeve K¹ I secure a jam
nut m by which the shaft may be turned to screw its shoulder end back and forth
on the shank h of eye bolt H to increase or decrease the distance between its eye
and the shouldered end of shaft K and in this way I draw the lower ends of
arms B³ back and forward to set the roller B at proper distance from roller B¹ to
suit the grain to be reduced. On each or either end of the shaft H I key an
arm M and I connect this arm with a corresponding arm on the same shaft of the
fast roller at the opposite end of the machine by a rod N having handles N¹ and
therefore when I desire to entirely separate the rollers in a series I have but to
throw the rod N in the direction of the arrow and this by revolving shaft H will
cause it to be wedged out by the heaving portion of its excentric from the upright
so as to carry the fast rolls away from the slow rolls. To regulate the tension of
spring L I turn the nut m' in or out as the case may be and the fast roll will be
held at a given distance from the slow roll by the spring L as long as grain only
passes between the rolls but as soon as any hard body enters, the spring will
permit the fast roll to yield and thus prevent any injury to the rolls by these
foreign substances. What I claim is :-
1 In a roller mill, the combination of fan blower D located above the mill and
between two series of rollers B with the said rolls and sieves and with hoppers E
slotted pipes C and pipes C¹ each communicating with the fan blower D and one of
the slotted pipes C³.
2nd The pipes C slotted as shown and terminating in hopper E having
deflectors e and c and projections & substantially as set forth.
3rd The combination of the fan blower D with the sieves and rolls, the pipes Ci
having gates b and the pipes C as set forth.
4th The swinging arms in combination with shaft K, excentrics, eyebolts and
yielding connections.
In witness whereof I the said Alfred Julius Boult have hereunto set my
hand and seal this 23rd day of April in the year of our Lord, One
thousand Eight hundred and Eighty three