Improvements in or connected with Sieving Apparatus for Forwarding the Material over the Surface of the Sieves, applicable also for Keeping such Surfaces Olean.
Year: 1892

page_text: Date of Application, 2nd Apr., 1892
Complete Specification Left, 27th Dec., 1892-Accepted, 11th Feb., 1893
4.
PROVISIONAL SPECIFICATION.
Improvements in or connected with Sieving Apparatus for
Forwarding the Material over the Surface of the Sieves,
applicable also for Keeping such Surfaces Olean.
I, JOHANNES HEYN of 6" Grabowerstrasse, Stettin in the Empire of Germany,
Engineer, do hereby declare the nature of this invention to be as follows:-
--
In horizontal or inclined shaking sieves (flat bolters) there are many difficulties in
the way of the movement of the material to be sifted from the entrance to the exit.
For instance, this movement ceases immediately if the material be damp. The flat
sieves forming the object of this invention are, in order to overcome this drawback,
arranged in such a way that compulsorily operated actuating devices, for moving
along the material to be sifted, are applied, which make a relative movement against
the sieving surfaces, and in fact the movement of the devices may be a constant, an
intermittent, or a to and fro (alternating) one.
Where a flat sieve with only one sifting surface is employed, a rotary motion is
given by means of a crank disc with pin, or else a to and fro motion (shaking one)"
by means of crank discs alone may be made use of.
The sieve is suspended by rods but may also be supported on rods, or rest in
cranks by means of which the motion is imparted.
Endless bands or chains (or belts, cords or the like) running over rollers serve as
forcibly operated forwarding devices, to which bands the forwarding strips are
attached. If one of the spindles of the rollers in question be set in rotation by
means of pulleys, as well as belts (chains or cords), the forwarding strips effect the
forwarding of the material to be sifted in the direction required.
The speed at which the material which is to be sifted is moved along depends.
entirely on the rapidity of rotation of the rollers which has this advantage, that the
time and speed of the sifting may be altered at will whether the sieve be stationary
or moving. As the forwarding strips move forward over the face of the sieve they
will of course convey the material from the delivery to the exit end.
If necessary, the forwarding strips may also be utilised for keeping clean the
sifting surfaces. For this purpose, the strips are made deep enough to come close
to the sifting surfaces. In order to spare the sifting surfaces, the strips must be
constructed of suitable material. In order to render the forwarding strips still more
suitable for cleaning the sifting surfaces, a space for play is preferably allowed so
that the forwarding strips may be moved somewhat to and fro by the movement of
the flat sieve. Further, in order that the upper webbing may not rub on the lower,
projections are preferably arranged, on which the forwarding strips, placed above,
travel. If, where broad forwarding strips are employed for cleaning the sifting
surfaces, the weight of the forwarding strips, together with that of the lower
webbing, is so great that the strips rub the sifting surfaces too closely and wear
these latter away too quickly, it is preferable to allow the lower forwarding strips
also to run on projections and to provide the under surfaces of the forwarding strips
with an elastic material (brushes, felt or the like). For instance, brushes (felt or
the like) may be attached to the strips by means of strips.
A flat sieve with two sifting surfaces and a collecting plate may be employed.
The material to be sifted, falling through the coarse sieve is re-sifted on the finer
sieve, and the material which has fallen through the latter sieve is accumulated on
the collecting plate. The forwarding devices before described are inserted on the
sieves and the collecting plate which convey the material to the exits of the sieves
and the collecting plate respectively.
Each separate forwarding web may be operated by means of chains from pulleys;

page_text: The
of, on the contrary, only one forwarding web is actuated by one chain.
forwarding web of the first sieve drives the forwarding web of the second sieve by
means of an intermediate chain, and the forwarding web of the third sieve by means
of another intermediate chain.
The flat sieves may be divided into three compartments.
The material to be
sifted in this case enters at one end, traverses the three divisions, forming the com-
partments winding at the ends from one into the other, under the action of forwarding
devices suitably placed.
In a further variety of a flat sieving apparatus with two sifting surfaces, the sifting
surfaces and the collecting plate are each attached to a frame work which is capable
of being taken out, and can be placed in the main frame. The actuated spindles
have each a coupling which can be disconnected to allow of the frame to be taken
out. These couplings have two cranks one of which has a pin which simply catches
against the other crank.
The intermediate partitions forming the compartments, as well as the end
partitions, may be provided with sieving surfaces, by which means the total sifting
surface of a frame inay be considerably increased.
Worms, conveying blades or the like may also serve as forwarding devices, which
are also placed in the sieve itself and move with it. The revolution of the same
may also be effected by means of pulleys and belts as well as by spindles for carrying
the chains or forwarding webs.
If the worms or the like are intended to keep the sifting surfaces clean, the
sifting surfaces of the three compartments must also be made cylindrical in form
like the worms or the like. These conveying blades are not to operate pneumatically,
but like worns simply convey the material from the one end to the other. The
form of the blades may be similar to propellor-blades and the blades be arranged
upon a shaft the one after the other, their action being similar to that of the well
known conveyors in mills.
The spindles of the forwarding apparatus may be actuated by means of a ratchet
mechanism.
Such a ratchet mechanism consists of a ratchet wheel and ratchet lever; the end
of the ratchet lever is caught by a fixed projection so that, when the flat sieve is
moved; the ratchet lever actuates the forwarding apparatus.
The forwarding strips may be attached to a travelling frame, which is connected
with a fixed part, such, for instance, as the wall of the building, and thus cannot
participate in the to and fro motion of the sieve. In this case, the forwarding strips,
in consequence of their stationary position, have a relative motion over the surface
of the sieve when the latter is moved in one direction or the other, which is utilised
for conveying the material from the entrance to the exit. The travelling frame,
having four sides, is connected with the fixed part by means of a bar.
The forwarding strips may be arranged as movable flaps on a bar. When the
flat sieve is moved in one direction, the forwarding strips are turned down, by
which means the forwarding of the material from the entrance to the exit takes
place.
If the flat sieve be moved in the reverse direction, the forwarding strips are
moved up from off the surface of the sieve and pass freely over the material. As
soon as the original movement is then re-commenced, the strips turn down again
and effect the forwarding of the material. The relative movement of the forwarding
strips (flaps) against the surface of the sieve may be increased or diminished by a
bar, being engaged by a crank and link rod, and the travelling frame being thereby
moved. Thus if the stroke of the crank be increased, or diminished, the speed of
the movement of the material may be altered.
The flaps in order to increase the forwarding action and to prevent any caking of
the material on the bar on which the flaps turn may be so arranged, that they
compulsorily turn up and down. For this purpose, a lever is arranged on each
flap the various levers are connected with a bar in such a way that, when the
latter is pushed in one direction, the forwarding strips are turned down, and, when

page_text: it is pushed in the opposite direction, the forwarding strips are turned up.
A spring
is attached to the flat sieve for the purpose of actuating the bar. This spring moves
backwards and forwards with the sieve and its curved end engages alternately in
one of two slots of the bar, and springs out of the same, after the turning up and
down of the forwarding strips.
When the bar has traversed its course, a projection at its end comes in contact
with the travelling frame, by which means the spring is pushed at the suitable time
out of its slot. If the bar be prolonged beyond the frame of the flat sieve, the spring
may also be arranged outside the sieve.
The connecting bar may also be extended through the flat sieve, and be attached
to the fixed part. In this case, the spring must bring the travelling frame to a
standstill by suitably engaging in the slots in the bar by which means the com-
pulsory movement of the forwarding strips from the one position into the other
position and vice versa is brought about..
The travelling frame may also be provided with forwarding strips which are
immovably attached to the same. In this case, when the flat sieve moves in the
one direction, the travelling frame with the forwarding strips must rest in such a
way that the latter reach the sifting surface, in order to produce the movement of
the material. But, as soon as the movement of the sieve in the reverse direction
takes place, the sliding frame with the forwarding strips must be lifted from off the
sifting surface. Movable tongues serve for raising and lowering the travelling
frame when the flat sieve is moved, and which (tongues) act on four pins of the
frame.
The forwarding strips may also be attached to the arms as long as they are turned
up and down by means of a compulsory motion. The flaps are then raised in a
semicircle nearly vertically from off the sifting surface, by which means the
forwarding power of the strips is further increased.
For the purpose of cleaning the sifting surfaces, the forwarding strips reach close
to the surface of the sieves, and must also be made of suitable material on the under
O surfaces. The surface of the sieves may also be cleaned from beneath, when
cleaning strips are attached on the upper side of the travelling frame, as well as on
the underside.
Finally, the forwarding strips may be arranged at one side only of the travelling
frame. The forwarding strips, in this case, either extend in one portion of their
5 width their fullest depth above the surface of the sieve; whilst the remaining part
of their width is made narrow so that the material, in its movement from entrance
to exit may pass over this part, and reaches down to the surface of the sieve in
order to clean it.
The forwarding strips, therefore, do not reach throughout their entire length to
O the surface of the sieve, and, therefore, only effect the forwarding of the material
to be sifted and not the cleaning of the surface of the sieve. Cleaning strips may
be arranged for the purpose of cleaning this.
For increasing or diminishing the relative speed of the forwarding strips, the
crank motion may also be employed in these latter arrangements. As may be seen
15 from the preceding examples, without further explanation, the invention may be
carried out in various ways.
The forwarding strips must, however, always make a relative compulsory motion
against the moving sieve surfaces.
The forwarding strips, for instance, might be also actuated by an electro-motor
50 arranged in the moving sieve frame.
Dated this 1st day of April 1892.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in or connected with Sieving Apparatus for
Forwarding the Material over the Surface of the Sieves,
applicable also for Keeping such Surfaces Clean.
1, JOHANNES HEYN, of 6B Grabower Strasse, Stettin, Kingdom of Prussia,
German Empire, Civil Engineer, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
In horizontal or inclined shaking sieves (flat bolters) there are many difficulties
in the way of the movement of the material to be sifted from the entrance to the
exit. For instance, this movement ceases immediately if the material be damp.
The flat sieves forming the object of this invention are, in order to overcome
this drawback, arranged in such a way that compulsorily operated actuating
devices, for moving along the material to be sifted, are applied, which make n
relative movement against the sieving surfaces, and in fact the movement of the
devices may be a constant, an intermittent, or a to and fro (alternating) one.
My invention will be more readily understood by reference to the accompanying
drawings, in which:
Fig. 1 is a sectional elevation of my improved sieving apparatus with only one
sifting surface.
Fig. 2 is a horizontal section.
Fig. 3 a cross sectional elevation of the same.
Fig. 4 is a longitudinal sectional elevation of my improved apparatus, provided
with two sifting surfaces.
Fig. 5 is a plan of a modified apparatus.
Fig. 6 is a cross sectional elevation of a sieving apparatus similar to Fig. 4.
Fig. 7 illustrates a modification, in which vertical sieves are employed in
connection with the horizontal sieves.
Fig. 8 is a cross section illustrating a modification of the transporting device.
Fig. 9 is a cross sectional elevation of my improved apparatus provided with
cleaning devices.
Fig. 10 is a detail section of such a cleaning device.
Fig. 11 is a cross section showing a special kind of coupling which I employ in
my invention.
Fig. 12 illustrates a modification similar to Fig. 4.
Fig. 13 represents another modification.
Fig. 14 shows the same in cross-section.
Fig. 15 is a plan of a further modification.
Fig. 16 represents another means for operating the transporting and cleaning
device.
Fig. 17 is a longitudinal sectional elevation of a scraper employed in conjunction
with my invention.
•
Fig. 18 is a plan of the same.
Similar letters refer to similar parts throughout the different figures.
In carrying out my invention as shown in Figs. 1, 2 & 3, I employ a flat sieve a
with only one sifting surface and the space above this sieve is not divided into com-
partments by any partitions; this flat sieve can be moved around, so that each
point thereof describes a circle (ie. without any shaking motion) by means of a
crank disc b with crank pin c, or else a to-and-fro motion (a shaking motion)
may be obtained by means of crank discs d and e, as shown by dotted lines in
Fig. 2.
In Figs. 1 & 3 I have shown the flat sieve suspended by means of rods but this
is of course immaterial and the sieve may be supported on rods or rest in cranks as
in sifting apparatus of similar construction already known.

page_text: It will be obvious that with a sieve exactly horizontal the material to be sifted
cannot be transported from one end to the other merely by the oscillating or
alternating motion of the sieve; for this purpose I have therefore provided the
following forwarding devices above the sieve a (Figs. 1—16) :
On the two shafts f and g, Figs. 1-3, are secured rollers h over which endless
bands or chains (or belts, cords, or the like) are running, to which the forwarding
strips are attached; if one of the shafts or spindles of the rollers in question be
set in rotation by means of pulleys and m and belts (or chains or cords) n in the
figures the shaft g is driven, the forwarding strips k will effect the forwarding of
the material to be sifted in the direction required and it will be easy to alter this
direction by employing for instance an open or a crossed belt.
The speed at which the material which is to be sifted, is moved along the sifting
surface depends entirely on the rapidity of rotation of the rollers h, which has this
considerable advantage, that the time and the speed of the sifting operation may be
altered at will whether the sieve be at rest or moving it will be obvious that it is
only necessary to increase or decrease the rapidity of rotation of the rollers.
This may for instance be effected by means of step pulleys 6, 7, 8 (as in Fig. 14).
which are mounted on the shaft 9 of the disc or pulley l.
It will be obvious that the driving belt n will participate of the oscillation of the
pulley m and of the flat sieve at its lower end and furthermore that the upper end
of the belt n which lies on the pulley will not oscillate; that is to say, the belt n
will oscillate after the fashion of a conical pendulum in the same inanner as the
suspension rods v. The driving pulley / may of course be also located below the
driven pulley in as indicated at in Fig. 13. It will be understood that the driving
o is the feed end for the
pulley or respectively has only a rotary motion.
entrance of the material to be sifted (Fig. 1) and p the delivery end for the exit
of the same. It will be obvious that as in this case the forwarding strips move
forward in this direction over the face of the sieve, they will of course convey the
material from the feed to the delivery end.
The forwarding strips k may also be advantageously utilized for keeping clean
the sifting surfaces, if necessary. For this purpose the strips are made deep
In order to prevent the wear of the
enough to come close to the sifting surfaces.
In
sifting surfaces by friction, the strips must be constructed of suitable material.
order to render the forwarding strips still more suitable for cleaning the sifting
surfaces, a space for play is preferably allowed (Figs. 3 & 6) close to the longi-
tudinal vertical walls of the apparatus so that the forwarding strips may be moved
somewhat to and fro in the direction of the arrows 38 (Fig. 6) by the movement of
the flat sieve.
In order that the upper half i of the chains may not rub on the lower half 2,
O projections (Figs. 3 & 6) are preferably arranged, on which the forwarding
strips k placed above travel and thus keep apart the upper and lower half i and i¹
respectively of the chains.
If where broad forwarding strips are employed for cleaning the sifting surfaces,
the weight of the forwarding strips together with that of the lower webbing is so
5-great that the strips rub the sifting surfaces too closely and wear these latter away
too quickly, it is preferable to allow the lower forwarding and cleaning strips k
(Fig. 9) to run on projections t' t' and to provide the lower edge of the forwarding
strips with an elastic material (brushes, felt, or the like). For instance in Fig. 10
I have shown an enlarged section of such a forwarding and cleaning strip; a is
0 the sieve, k the forwarding strip, L the brush, felt, or equivalent material, Ma
lath for securing the brush or felt; in Fig. 9 the brush (or felt) is likewise
lettered L.
In Fig. 4 I have shown a flat sieve with two sifting surfaces a' and a² and a
collecting bottom-plate a³. The material to be sifted falling through the coarse
5 Bieve a¹ is received on the finer sieve a' and the material which has fallen through
"the latter sieve is accumulated on the collecting plate. The forwarding or cleaning
devices before described are inserted on the sieves a¹ and a² and the collecting

page_text: bottom-plate a³ which devices convey the material to the exits of the sieves and
the collecting plate respectively.
In Fig. 5 a Hat sieve is represented which is divided into three compartments.
The material to be sifted in this case enters at one end o¹, traverses the three
divisions I, II and III in the direction indicated by the arrows u under the action
of the five forwarding devices 1, 2, 3, 4 & 5 and leaves the sieve at p¹. The two
forwarding devices 4 & 5 placed transversally serve to effect the connection
between the compartments I & II or II and III respectively as will be obvious.
In a further variety of a flat sieving apparatus as shown at Fig. 6, the two sifting
surfaces a' and a² and the collecting bottom-plate a³ are each attached to a frame
work A A A³ which is capable of being taken out of the main frame B
(Figs. 4, 5, 6). As will be seen by Figs. 5 & 6 the actuated spindles have
each a coupling g' which can be disconnected to allow of the frames A¹ A2 A³ being
taken out.
As shown at Fig. 7 the intermediate partitions C1 and C2 forming the com-
partments I II III as well as the longitudinal walls D D' may be provided with
vertical sieving surfaces 6' by which means the total sifting surface of a frame may
be considerably increased; the material sifted is discharged in the direction shown
by the arrows in Fig. 7. Instead of forwarding strips as above described, worms,
fans or the like, may also serve as forwarding devices which are also placed in the
oscillating or reciprocating sieve frame itself and move with it. The revolution of
the same may also be effected by means of pulleys and belts n (Figs. 1 & 3) in a
like manner as the operation of the spindles for carrying the chains or forwarding
webs. The outlines of the worms are indicated in Fig. 7 by the dotted circles
S⁹ S³.
If the worms or the like are intended to keep the sifting surfaces clean the sifting
surfaces a of the three compartments I II III (Fig. 8) must also be made
cylindrical in form like the worms or fans as shown in the drawing. In Fig. 8
as in Fig. 7 the outlines of the worms are indicated by the dotted circles S1 S2 S³.
The longitudinal walls are also formed as sieves so as to increase the total
sifting surface.
My improved forwarding and cleaning device may be employed for inclined flat
sieves with the same advantage as for horizontal flat sieves.
The spindles for g of the forwarding or cleaning apparatus may be actuated in
any suitable manner for instance by means of a ratchet mechanism, which is
operated by the movement of the sieve itself. In Figs. 2 & 3 1 have shown such
a ratchet mechanism in dotted lines; the ratchet wheel is lettered w and the
ratchet lever Z. The end of the ratchet lever is caught by a fixed projection y
so that when the flat sieve is moved the ratchet lever actuates the forwarding and
cleaning apparatus.
The spindle g may also be actuated by the flexible shaft 10 and of wheels 11, 12, 13
& 14, the wheel 14 being mounted on the driving shaft 15 (Fig. 16); it will be
obvious that the flexible shaft 10 will perform a motion similar to that of the
suspension rods v (Figs. 1 & 13) or the driving belt n.
As a rule however it will be most advantageous to set the forwarding and
cleaning devices in motion by belts n or chains, as before described; I will only
mention that the driving pulleys and the driving pulleys m on the spindles of the
forwarding devices must be as exactly as possible vertically above each other, in
order that the belts or chains n (Figs. 1, 3, 4 & 13) may remain stretched during
the oscillating movement of the Hat sieve. I will further mention that the
forwarding and cleaning strips secured to the upper chain or webbing may be caused
to rub on the lower face of the sifting surface placed directly above the same.
Furthermore the said strips may also be employed only as cleaning strips on
the lower face of the sifting surface for instance when the sieve is inclined and a
special device for forwarding the material is thus made dispensable.
It will be obvious that I may employ any number of sieve frames A (Fig. 6)
located above one another and provided with my improved forwarding device.

page_text: As a further modification of my invention I will mention the employment of
electrical power for rotating the spindles of the forwarding devices which may be
effected either by placing an electric motor on the flat sieve and actuating the
spindles of the forwarding and cleaning device by means of a belt or chain, or by
fitting a small electric motor directly to each of these spindles.
g
In order that the several sieve frames A' A' A³ may be readily inserted into-
the main frame B and in order to avoid the necessity to withdraw the spindles with
the couplings g¹ (Figs. 5 & 6) when the sieve frames are inserted or taken out,
I employ the following arrangement: The couplings g¹ are provided with or con--
stituted by two cranks K and K¹ one of which has a pin which simply catches
against the other crank and thus connects the spindles 9 and y². When employing
these cranks it is not necessary that the spindles g and g' which are connected by
the said cranks be exactly in line with one another as the pin may glide on
The-
the cranks against which it catches, when the spindles are rotated.
employment of these double cranks is very important as it is very difficult to place
the spindles g and g² in line with each other especially if a considerable number of
frames are placed above one another.
Each separate spindle of the forwarding and cleaning devices may be operated
by means of belts n or chains from pulleys as shown in Fig. 4; or on the
contrary only one spindle of a forwarding and cleaning web is actuated from the
driving pulley and all other spindles of the forwarding and cleaning devices are
set in motion by means of chains or belts from this first spindle. Such an arrange-
ment I have shown for instance in Fig. 12; the pulley and belt n actuate the
spindle g of the forwarding and cleaning device belonging to the frame A¹, the
forwarding device contained in the frame A2 is operated by means of the belt n¹
and the pulleys and similarly the forwarding device of the frame A³ is driven
by the belt n and the pulleys 73 and 1.
The connection of the several forwarding and cleaning devices may also be
effected by means of toothed wheels 17, 18, 19 & 20 (Figs. 13 & 14) taking the
place of the driving belts and pulleys.
In Figs. 14, 15 & 16 I have shown that it is not necessary to secure the forwarding.
and cleaning strips k to two cords or chains as shown in Figs. 2 & 6, but one
broad belt will be sufficient for this purpose.
2
i
Finally I will mention that I employ scrapers 21 (Figs. 15, 17, 18) in conjunction
with the belts in order to prevent the material to be sifted from clogging the
space between the belt and the roller h. This scraper 21, as shown more fully in
Figures 17 & 18, rests with one end on the spindle ƒ (or g) and with the other end
on a bridge 22 at this bridge the scraper is pointed in the form of a ship's top and
its upper edge is placed as close as possible to the upper web i. In consequence.
thereof any particles of the material to be sifted which should be carried along by
the belt in the direction of the arrow 23 (Fig. 17) will be scraped off this belt by
the scraper 21 and will thus be prevented from getting between the belt and the
roller carrying the same. If nevertheless a slight quantity of the material should
get to the roller h, this material would be scraped off by the bottom 21" of the
scraper 21, which bottom extends close to the circumference of the roller h.
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 :-
1. In combination with horizontal or inclined flat sieves, devices for forwarding
O the material to be sifted or for cleaning the sieves or for both purposes, said devices.
having a continuous forward or rotary motion, and the spindles of these devices
being supported in the sieve frame itself or in parts rigidly connected thereto, said
spindles furthermore partaking of the motion of the sieve frame besides being
rotated, substantially as and for the purpose set forth.
5 2. In a sifting apparatus of the kind claimed under head 1: The forwarding or-
sieve cleaning devices constituted by the rotatable spindles fand g, rollers over-

page_text: which endless chains (or belts, cords or the like) are running, forwarding or
cleaning strips k, secured to the said chains these forwarding strips being employed
only as such or also as cleaning strips for the upper and lower surface of the
sieves; said strips being further set in motion by a chain n (or belt or the like) and
a pulley 1, or by a flexible shaft 10 (Fig. 16) or by a ratchet mechanism w Z¹
(Fig, 3) with a constant or variable speed of rotation, for the purpose set forth.
3. In a sifting apparatus of the kind claimed under head 1: The forwarding
devices constituted by worms S (Figs. 7 & 8) which are likewise driven by a chain n
(or belt or the like) and a pulley 1, or by a flexible shaft 10 (Fig. 16). or by a
ratchet mechanism w % (Fig. 3) with a constant or variable speed of rotation, for
the purpose set forth.
4. In a sifting apparatus of the kind claimed under head 1: providing the side
walls D' and the intermediate partitions C¹ C* (Figs. 7 & 8) with sifting surfaces b¹,
for the purpose set forth.
5. In a sifting apparatus of the kind claimed under head 1: actuating the
spindles fg of the forwarding or cleaning devices by means of electricity, sub-
stantially as described.
.
6. The hereinbefore described improvements in the construction of sifting
apparatus, substantially as set forth with reference to the accompanying drawings.
Dated this 23rd day of December 1892.
JOHANNES HEYN,
By Robert Deissler,
Agent for the Applicant.