Improvements in or applicable to Roller Mills for Grinding Flour and the like.
Year: 1898

page_text: Improvements in or applicable to Roller Mills for Grinding Flour
and the like.
I, JOSEPH PETRIE FIELDEN, of Park Terrace, Rochdale, Engineer, do hereby
declare the nature of this invention to be as follows:-
My said invention relates to means to be applied to roller mills such as are used
for grinding flour and the like for the purpose of withdrawing heated air from the
interior of the mill while retaining to a considerable extent the fine flour or
" stive
which is liable to escape with the issuing air.
"
According to my said invention I place in the casing of the mill over the rolls
one or more longitudinal chambers or receptacles which are internally in communi-
cation with the air outlet pipes.
Each receptacle or chamber has a hinged side or flap provided with means for
regulating the position of the same from outside the mill casing as for instance a
sliding rod and pinching screw. The said hinged side or flap forms an adjustable
valve for regulating the area of the aperture through which the escaping air can
pass on its way to the air outlet pipes. By causing the flap to bear against a rib
or ledge the air outlet may be completely closed.
As the heated air from the milling operation ascends from underneath the rolls
and past the feed tray or trays to the adjustable sides of the receptacle it will
deposit much of the "stive" or fine flour. Some of the remaining "stive" still
held in the escaping air will further be deposited in the beforementioned receptacles.
To enable the deposit therein to be returned I provide at the under side or sides of
the receptacle hinged plates or flaps which open intermittently in order to allow
the deposited "stive" to fall back into the mill.
The intermittent opening of the flaps takes place automatically. In one form
of my said invention the opening of the flaps is effected by gravity. In this case
the flaps are set at a suitable angle and provided with counter weights so that
when a certain quantity of deposit has accumulated in the receptacle the counter-
weight will be overbalanced and the accumulated "stive" will open the flap.
In another form of my said invention the said flaps are operated intermittently
by suitable gearing such as cord or belt driving, toothed gearing, a worm and
worm wheel, a screw, or a ratchet and pawl, either separately or in combination
with each other.
Doted this 31at dow of March 1808

page_text: Improvements in or applicable to Roller Mills for Grinding Flour
and the like...
I, JOSEPH PETRIE FIELDEN, of Park Terrace, Rochdale, Engineer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following state-
ment:
-
My said invention relates to means to be applied to roller mills such as are used
for grinding flour and the like for the purpose of withdrawing heated air from the
interior of the mill while retaining to a considerable extent the fine flour or
"stive" which is liable to escape with the issuing air.
In order that my said invention may be more clearly understood I will describe
the same with reference to the accompanying drawings in which
Fig. 1 is a cross section of so much of a roller mill as is necessary to show the
application thereto of my said invention.
Fig. 2 is a section of a detail.
Fig. 3 is an external elevation showing means for mechanically opening the
"stive" receptacles.
According to my said invention I place in the casing of the mill, over the
rollers a a, one or more longitudinal chambers b b which are internally in con-
nection with the air outlet pipes c c. Each receptacle or chamber has a hinged
side or
flap d the position of which is regulated from the outside by for example a
rod or projection d' attached to the flap and sliding in a slot and provided with
pinching nut. A washer or plate under the pinching nut d³ covers the slot.
The said hinged side or flap d forms in effect an adjustable valve for regulating
the area of the longitudinal aperture through which the escaping air passes on
its
way to the air outlet pipe. By causing the flap to bear against a rib or ledge (+
the air exit may be completely closed.
As the heated air from the milling operation ascends from underneath the rolls
it takes the direction indicated by the arrows e e past the feed tray, or trays gland on
its way to the flaps dit deposits much of the "stive" or fine flour. Some of the
remaining "stive" still held in the escaping air will also be deposited in the recep-
tacles b. To enable the deposit therein to be returned I provide at the under
side or sides of the receptacle hinged plates or flaps f f which open intermittently
in order to allow the deposited "stive" to fall back into the mill.
The intermittent opening of the flaps takes place automatically. In one form
of my said invention the opening of the flaps is effected by gravity. In this caso
the Haps are set at a suitable angle and provided with counterweights f¹ so as
normally to keep them closed as shown in Fig. 1. When however a certain
quantity of deposited stive has accumulated in the receptacle its weight will over-
balance the counterweight and the flap will open and allow the deposited stive to
escape.
In another form of my said invention the flaps f are operated mechanically by
suitable gearing or mechanism deriving motion from any convenient part of the
mill or its machinery. I show in Fig. 3 an example of such mechanical operation
of the flaps. A stud g attached to the oscillating feed tray g¹ extends through
the casing of the mill and engages with the forked end of the lever h which has
its fulcrum at h¹. A pawl h² at the other end of the lever drives the ratchet
wheel in the direction indicated by the arrow. Rotating with the ratchet
wheel is a pinion having only a single tooth which at each revolution gears
with the spur wheel h5 and moves it forward one tooth. (The ratchet wheel and

page_text: the spur wheel have teeth on their entire circumference indicated by the dotted
lines.)
On the face of the wheel 5 is a stud h which at each revolution takes alternately
against the inclined ends or cams of the slide bars h. The outer ends of the slide
bars h are connected to studs extending through the casing from the flaps f so
that when acted on by the stud 6 the flaps are opened and the contents of the
receptacles are discharged. In this construction springs or other arrangements
of weights than that shown may be used for again closing the flaps when the pin h
has passed.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
-
1. In a roller mill the use of a stive deposit chamber arranged over the rollers
and having sides or flaps for intermittently discharging its contents substantially
as described and shown.
2.A stive deposit chamber having movable flaps or sides for automatically
discharging the accumulating deposit substantially as described and shown.
3. The combination with a stive deposit chamber of a hinged side or flap for
regulating the aperture through which the issuing air enters the deposit chamber
in combination with means for regulating its position from the outside of the
casing.
Dated this 30th day of June 1898.
E. T. WHITELOW, A.M. Inst. C.E.,
70, Deansgate, Manchester, Agent for the Applicant.