Improvements in and relating to Centrifugal Dressing Machines for Flour or other Material.
Year: 1890

page_text: Date of Application, 17th Oct., 1890
Complete Specification Left, 8th July, 1891-Accepted, 15th Aug, 1891
PROVISIONAL SPECIFICATION.
Improvements in and relating to Centrifugal Dressing Machines for
Flour or other Material.
I, JOHN SNODGRASS, of Washington Mills, Glasgow, Lanarkshire, Flour Miller,
do hereby declare the nature of my invention to be as follows:-
This invention has reference to and comprises improvements in the construction
of centrifugal sifting or dressing machines for flour or other material of the class
in which an outer horizontal or slightly inclined cylinder or reel rotates, formed of
a number of open longitudinal half round section bars or ribs with transverse
circular rings at short distances apart on these, covered with an outer web of silk,
and within which cylinder a reel or series of rotating fan or beating rings revolve
at a much greater speed to agitate the flour or other material and assist the sifting
action of the silk.
Hitherto the longitudinal bars, which are generally about eight or ten in number
round the circumference, have been made and fitted as described in such a manner
that they obstruct the flour or material from passing round and round the reel or
cylinder shell between them and the silk cover, and there is generally formed a
"bank" or thick gathering of material that interferes with the dressing capacity
of the machine.
The object of my invention is to obviate these disadvantages and to make these
longitudinal bars regular lifters of the flour or material, so that it will be brought
to catch and
round in a regular manner, and enable the inner reel or "beaters
distribute it against the silk cloth or cover all round.
י,
The improvements essentially consist in forming the longitudinal bars of these
centrifugal machines of a new or improved flat radial shape on the top or advance
side, with a tangential or straight inner side, and of a curved or angled shape at the
outer side, making the bars nearly of a triangular shape in cross section, with the
apex next the silk and leaving an open space between this and the silk. These
bars so formed are secured at their upper back edge in grooves or slits in the
circular rings and rivetted or secured to them from the outside where the silk web
covering is put on. By this improved construction of these longitudinal bars with
flat radial surfaces these surfaces lift and carry the flour or material on the
advance side as they are rotated until they reach the top vertical centre when it
falls off and is distributed and dressed by the fan blades and silk, and no flour can
rest on the back of the bars, as the currents of air pass in the open space between
thèse and the silk, and so all the surface of the silk is available for the sifting
action.
D
Lesh Otho 1000
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Centrifugal Dressing Machines for
Flour or other Material.
I, JOHN SNODGRASS, of Washington Mills, Glasgow, Lanarkshire, Flour Miller,
do hereby declare the nature of my said invention and in what manner the same is
to be performed to be particularly described and ascertained in and by the following
statement in writing, that is to
say::
This invention has reference to and comprises improvements in the construction

page_text: of centrifugal sifting or dressing machines, for flour or other material of the class
in which an outer horizontal or slightly inclined cylinder or reel rotates, formed of
a number of open longitudinal half round section bars or ribs with transverse
circular rings at short distances apart on these, covered with an outer web of silk,
and within which cylinder a reel or series of rotating fans or beating rings revolve
at a much greater speed to agitate the flour or other material and assist the sifting
action of the silk.
And in order that my said invention and the manner of performing or carrying
the same into effect or practice may be properly understood, I have hereunt
appended an explanatory sheet of drawings in which the same reference letters
are used to indicate corresponding parts in all the figures where shown.
Figure 1 is a longitudinal elevation with a great part of the centre broken away
atz of a centrifugal flour dressing machine, with the upper side doors or covers as
removed at A' from the main framing A to show more clearly how my improvements
are or may be carried into practice.
Figure 2 is a transverse section showing the sifting cylinder or recl formed by
strong end rings B on their hollow eyes B¹ on which they rotate in bearings 12
outside the beater shaft C, and the intermediate circular light rings band to which
my improved longitudinal bars or ribs a are applied as hereinafter described,
showing also the internal beaters and their ring frame C mounted on the central
shaft C
b
C
Figures 3, 4 and 5 are a transverse section, edge view, and a side view respec-
tively, of part of one of my improved longitudinal reel bars or ribs a showing also
the transverse circular rings over which the outer silk covering B2 is placed, and
secured in grooves by the straps B₁, the ends of each bar a being secured by nuts
through holes in their end discs B, as indicated to a large scale in Figure 24.
Figures 6, 7 and 8, are views corresponding to Figures 3, 4, and 5, but showing
the improved longitudinal reel bars a as formed with a cavity or part cut away
at a on their outer edge or surface next the silk covering B².
Referring to these drawings.-Hitherto the longitudinal steel or metal bars a
which are generally from about seven to ten in number round the circumference,
have been made and fitted as described in such a manner that they came up to near
the outer surface of the rings B and silk and obstructed the flour or material from
passing round and round the reel or cylinder shell between them and the silk
cover B, a small part of which is shown broken away in Figure 1, and in dotted
lines in the other figures, and there is generally formed a "bank"
or thick
gathering of the unsifted flour at these parts between the rings B, that interferes
with the dressing capacity of the machine.
The object of my invention is to obviate these disadvantages and to make these
longitudinal bars a regular lifters of the flour or material, so that it may be brought
round in a regular manner, and enable the inner reel C with the "beaters
catch and distribute it against the silk cloth or cover B² all round.
€ to
The improvements essentially consist in forming the longitudinal bars a of these
centrifugal machines of a new or improved flat radial shape on the top or advance
side, at a', and of a curved or angled shape at the outer side at a² making the bars a
nearly of a triangular shape in cross section, with the apex next the silk B2 and
leaving an open space at a³ between this edge and the silk. These bars a so
formed are secured at their upper outer edge by checks at to the circular rings b,
(or the checks might be in the rings), and secured by rivets 62 on the outside
where the silk web covering B2 is put on. By this improved construction
of these longitudinal bars a to a² with flat radial surfaces a¹ these surfaces lift
and carry the flour or material on the advance side as they are rotated as indicated
. by the arrows in the figures until they reach the top vertical centre when it falls
off and is distributed and dressed by the fan blades C c and silk B2 and no flour
can rest on the back a² of the bars a as the currents of air pass in the open spaces a³
between these and the silk B³, and so all the surface of the silk is available for the
sifting action, as the bars a form little or no obstructing action.

page_text: 22
These improved longitudinal bars a to a² are preferably formed for about half
or nearly half their length at the feeding-in end of the machine with cavities or
parts cut away at all on the outer edge between the transverse circular rings bb
as shown in Figures 6 to 8, and on the right hand part of the machine in Figure 1,
to assist the sifting action on the flour as fed-in in its coarser state, and prevent
all banking
65
or accumulating at these parts. While the other end or half of
the bars a are preferred to be made parallel with the silk B2 as shown in Figures 3
to 5. The sifting reel frame Bb with the reels B, and silk B2 on it and the beater
frame Cc, are preferably rotated both in the same direction at a differentiating
speed of about 1 to 7 respectively and operated by pulley and belt or chain
gearing, and the machine is all otherwise constructed and worked in the usual
manner, the ground material to be sifted being fed in at D through the hollow
eye B' of the reel B, and discharged out through the opposite eye at D'; while the
dressed flour is removed by the conveyer screw spindle E from the lower box E¹
of the enclosing frame A, A".
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is,―
First. In a centrifugal dressing machine for flour or other material, the con-
struction or arrangement and combination of the parts of the rotating sifting reels
having the longitudinal silk covered bars of a triangular shape and with spaces
between these and the silk, substantially as and for the purposes herein described
in reference to and shown in the accompanying drawings.
Second. In a centrifugal dressing machine for flour or other material, the con-
struction and use of the longitudinal sifting reel bars or ribs of a flat radial shape
on the top surface or advance side, and of a curved or angled shape at the back or
outer side or surface, and forming spaces between these and the silk covering,
substantially as and for the purposes herein described, in reference to and shown in
the accompanying drawings."
Dated the 7th Tu... 1001