US171542A - Improvement in middlings-purifiers - Google Patents

Description

`2.Shee'r.s-S11ee2.` J. L. WILLFORD. MIDDLINGS PURIFIER.

No.v171,542. 1 Patented Dec. Z8, 1875.

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UNITED STATES PATENT OFFICE JOSEPH L. WILLFORD, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF ONE- HALFHIS RIGHT TO EPHRIAM RUSSELL, OF SAME PLAGE.

IMPROV'EMENT IN MIDDLINGS-PURIFIERS.

Specification forming part of Letters Patent No. l 71.5112, dated Decemberv 28, 1875; application filed October 8, 1875.

To all whom it may concern Beit known that I, J osEPH L. WILLFORD, of Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Midd1ings-Purif1crs,which improvements are fully lset forth the following specification, reference Fig. 3, a front view of the hopper and series of inclined overlapping shelves 5' Fig. 4, a top -or plan view of the machine, with the cover removed, showing the valves and devices for operatingv them.

`My invention relates to improvements in devices for separating the different elements of which our-middlings are composed; and the invention consists in devices arranged over the shaker for regulating the air-currents through the different portions thereof; also, in the combination and arrangement of devices for operating the shaker and inclined overlapping shelves, over which the material passes from the hopper to the head of the shaker; also, in the arrangement of devices for giving a transverse reciprocating motion to the bottom of the hopper; and, finally, in the combination, with transverse conveyers, of an adjustable cut-off between them, all as hereinafter fully described.

A, in the drawings,is the receiving-hopper, provided with an adjustable strip, a, for regulating the feed. B is the movable bottom of the hopper, and which receives a transverse reciprocating motion through the medium of the reciprocating shaker D, angular pivoted lever b, and connecting-rod b', to which one end of the movable botttom is secured.

The above-described motion to the bottom B causes the material to seek its level in the hopper, whether there is much or little there in, and feed it evenly under all circumstances.

C are a series of reciprocating inclined overlapping shelves, secured to the shaker-frame between the bottom of the hopper and the head of the shaker, over which the middlings from the hopper pass, and while passing from one shelf to another are subjected toair-currents produced from or by the suction-fan F, which separate and carry off the light fuzzy particles ofthe material which clogs the meshes ofthe bolt-cloth, thereby o bviating the use of devices for keeping the bolting-cloth clear, for Whatever light material reachesY the shaker falls upon a blank section of board bottom, where the reciprocating motion of the shaker causes the lighter particles to come to the top ofthe material, and as they reach the boltingcloth are in a favorable position to be drawn away by the ascending air-currents through the cloth. Just in rear of the series of overlapping shelves above described is a pivoted valve, g, for regulating the inlet of airbetween them, and which is operated by a lever, g', on the outside of the machine for adjusting the same.

D is the shaker, covered with bolting-cloth in the usual manner, and is suspended by swinging arms d, pivoted from arms d secured in slotted brackets d2 on the frame of the machine, (see Fig. 5,) so that the arms d1 can be readily adjusted in the slots d3 of the brackets, and, when adjusted, are held by the screwbolt and nut d4. The object of suspending the shaker as above described is, that when adjusting the hangers so as to throw the point of support to or from a perpendicular, for increasing or decreasing the flow or speed of the material over the cloth', the shaker does not need supporting by hand. The shaker is reciprocated by means of the eccentrics c on the fan-shaft c1 and pitman c2 connecting with the rods c3, which connect the hangers with the front end of the shaker, as clearly shown in Fig. 3. i v

Former devices for the purpose of regulating the draft or passage of air to the exhaustfan have generally consisted of horizontal slides or obstructions, and usually divided the air into a few currents, which of course causes greater draft at certain points through the cloth than others, and besides the heavier particles drawn away settle down on top of these slides or valves, which necessitate frequent removal by hand. f

' By my devices, as hereinafter described, the

air can be evenly distributed through all parts of the machine.

closing the valves.

`may be.

In the drawings, E and E show the position ofthe valves, which are made in two sections for giving a stronger draft through one end of the shaker than the other, if desired, sec tion E being open and section E closed. The blank e in section E allows the heavier particles which' have been drawn away to settle beneath the fan, and by accumulating they open the'valvef, and pass olf with the waste from the shaker D, through the valve k on the rear of the machine.

Fig. et shows the manner of opening and h and h are two levers pivoted to the sidesof the machine at t', Fig. 1, for operating the valves ofthe two sections E and E. When the valves are to be opened or closed it is only necessary to draw out or push in the levers, which are held in position by the wedges j, as clearly shown in Fig. 4. The valves e areattached to the frame G by wire staples, and the frame is set at an angle .or inclined toward the tail of the shaker, so

that the air-currents in passing through sweep directly across the valves, and thereby keep them clear. The blank e also permits a too strong and directdraft over the tail of the shaker, and admits of the fan being placed low down or near the cloth. I are longitudinal openings through the sides ot" the machine, just below the shaker, for the admisy sion of air.

Usually there are two. or more grades of bolting-cloth on the shaker, the finest at the head thereof, and all that passes through it is finished, and that which passes through the coarse cloth is called returns, and'is kept separate, to be reground and rebolted or purited. Sometimes only one grade of cloth is used with the esame general results; but the point on the cloth where the division should Vbe made varies with the quality of the material, or iu grinding high or low, as the case An adjustable device is therefore necessary' in order to divide at will the material passing through the shaker at any point thereon, and kept from mixing while falling `into the hoppers, which is accomplished as follows: J J are gather-boards, which collect the material and deliver it to the two transverse conveyers L L. M is an adjustable cnt-` ol between them. Said cut-off is made in two parts, m m', sliding together and gibed, as shown in Fig. 5. The part m reaches up to the cloth on the shaker, and rests upon the sides ot' the machine formed by the openings I, and as it is swung to or from the centerit is self-adjusting in length, and can therefore be set at any desired point to divide the middlin gs passing through `the boltiug-cloth.

Motion is communicated to the fan-shaft by a belt from pulley N to the power-wheel, which in turn communicates motion to the conveyers `through the medium of band-pulleys O1 O1,

belt O2, and gear-wheels P P.

Further description of the operation of the v.machine is deemed unnecessary, it being obvious from the foregoing description.

I claim as m y invention- 1. The combination, with theshaker D and snction-fan F, o' the valves e, in two sections,

`E E', operated as described, and arranged at an angle, or inclined toward the tail of the shaker, substantially as and for the purpose specified.

2. The combination, with the shaker D and inclined overlapping shelves U, ot' the operating mechanism, consisting of the pivoted han gers d, rods d1, slotted brackets d2, rods c3, pitmen c, and eccentrics c1 011 fanfshat't,all being arranged to operate in the manner substantially as shown and described.

3. The combination, with shaker D and over lapping shelves G, of the transverse reciprocating bottom B ot' the hopper, operated through the medium of the shaker D, angular lever b, and connecting-rod b', substantially as described.

A4f. The combination, with the transverse conveyers L L and shaker D, of the adjustable cut-ott' M, formed in two parts, lm, m', sliding together in the manner substantiallyas and for the purpose specified.

In testimony that I claim the foregoing I heve hereunto set my hand. i

JOSEPH L. WILLFORD.

Witnesses:

VERNON BELL, LEWIS Marsu.

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