US454065A - Scalping-machine - Google Patents

Description

(No Model.)

J. PYB. SGALPING MACHINE.

110.454,065. Patented June 16,1891.

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4UNITED STATES PATENT OFFICE.

SCALPING- MACHINE.

SPECIFICATION forming partof Letters Patent No. 454,065, dated June 16, 1891. Application filed March 8, 1889. Serial No. 302,451. (No model.)

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Be it known that I, JAMES PYE, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Scalping-Machines, ot which the following is aspecitcation.

This invention relates to scalping-machines for separating the products of the rolls in flour-milling; and it consists in the construction, combination, and arrangement of parts, as hereinafter shown and described, and specifically pointed out in the claim.

In the drawings, Figure l is a sectional side elevation, and Fig. 2 is a sectional front elevation, of the scalper. Fig. 3 is a detached sectional detail illustrating the manner of clamping the adjustable screens.A v

A is a casing or frame, which may beof an y, suitable size or form, but for ordinary use is about tive feet high and twenty-four by twenty-eight inches inside. In the upper part of. the frame A is journaled a revolving feedroll B', having the feed-hopper B2 above it, and a spring-actuated feed-slide B3, by which the flow may be regulated, the latter being connected to the lower part of the hopper, as shown. Across the interior of the casing A are pivoted a number of inclined screenframes E, the upper frame arranged to discharge its tailings upon the next one below it, and so on, the tailings from the lowerscreen being discharged into a discharge-spout F', from which they are conveyed again .to the rolls or stones for further reduction. Beneath the upper screen E is arranged an inclined chute G to receive the material passing through the screen and convey it by a spout H to a discharge F2, while a similar chute G2 and the discharge F3 likewise con- Vey the material falling through the remaining screens into the same discharge-spout F2, All the material passing through the screens is thus discharged at F2, and all the tailings from all the screens is discharged at F. I have shown three of these screens E arranged in zigzag or alternating order; but ofcourse it will be understood that any number may be employed, and that they may be arranged in any manner to cause the material to flow from one to the other in regular order. The screens are each shown with the screen material, which is usually wire-cloth arranged in two sections a a2, the sections a being attached to the upper edge of the screenframe and the sections a2 being attached to the lower edge of the screen-frame. Acrossbar E is arranged across each of the frames E to carry the inner edges of the two sections a a2 of the screens. By this construction 6o the material flowing over the upper sections a and passing to the lower section a2 is caused to fall over the cross-bar E with some force upon the next section, and be thereby subjected to a tumbling motion, which greatly assists in the separation of the particles and breaks up any regularity of position which they may have assumed by their difference of gravity. i

Suspended by pivots 7L across each of the 7o frames E, just in advance of its cross-bars E', is a retarding-strip E2, whose function it is to form a stop to t-he material as it falls over the cross-bars and retard its downward flow and prevent its too rapid motion down the screen, thereby great-ly assisting the action of the cross -bars and still further agitating and breaking' up the regular arrangement of the particles.

The pivoting of the retarding-strips E2 to 8o the side frames of the screens above their edges so that they hang downward with their lower edges near the screens is an important feature of my invention, as they are rendered thereby automatic in their action, their gravity keeping them down in place and holding them against the ordinary pressure of the liowing material, but so that they are capable of yielding in yevent of any extra iiow of material and allow it to pass, and thus avoid 9o choking or clogging of the machine.

In the manufacture of flour, when the grain is passed between the rolls to partially reduce it the result is a mass consisting of particles of free middlings, flour, particles of 9 5 middlings clinging with more or less tenacity to particles of the husk and bran, and particles of free husk and bran, and to separate the particles of the free middliugs from the combined husks and middlings and from the Ice free bran is the function ofV the machine illustrated in the drawings, such machines being technically called scalpers, the action of separating the free middlings immediately after each break or passage of the grain through the rolls being termed scalping The wire-cloth on the screen-frames will therefore be graded to correspond with the lineness of the material to be acted upon, so that the lniddlings and flour onlywill pass through the meshes of the cloth, while the bran or husk will pass over the tail of the screens.

I have shown each screen E divided into two of the sections a a2; but a greater number of these divisions maybe employed it' required, so as to increase the amount of the agitation imparted to the material flowing over them. I have also shownbut one of the flexible retarding-strips E2 upon each screen; but two or more may be employed, if required, according to the nature and condition of the material passing through the machine.

Each of the screen-frames is pivoted by bolts cl to the frame A, so that the inclination may be adjusted to any required extent t0 regulate the iiow and adapt the machine to the condition of the material.

In the drawings the upper and lower screenframes are shown set at their highest or most nearly perpendicular angle of inclina-tion, While the central screen-frame is shown set at its lowest or most nearly horizontal angle of inclination to illustrate the adjustable feature of the screen-frames; but in practice all the screen-frames of each machine will be set at the same angle. Each of the bolts d passes out through the sides of the casing A and is provided with thumb-nuts d?, by which the screen-frames may be clamped and held at any required angle.

Beneath the sections a a2 of the wire-cloth brushes M are arranged, being supported loosely in brackets M2, the latter resting upon reversed threaded screw crossrods M3, as shown. Vithin each of the hubs M* of the brackets M2 is a swiveled catch b', adapted to rest in one of the threads of the screw-rods, and thereby couple thcbrackets to the screwrods, so that when the latter are revolved the threads, acting upon the catches, will cause the brackets to travel along the screw-rods and carry the brushes M' with them and thus brush the under side of the cloth. At each end of the rods M3 a stop-ring b2 is secured, against which the catch b strikes to reverse the catch and throw it into the other and reversed thread in the screw-rods, this action causing the brushes to travel regularly yback and forth beneath the cloth. rlhe bolts d' and screw-rods M3 not being in line, the adjustment of the screen-framcs changes the relative positions of the screen-frames and brackets M2; but by arranging the brushheads loosely in the brackets they will slide back and forth in the bracke ts and not change their positions with relation to the screenframes. By this simple construction the brushes are caused to constantly travel back and forthbeneath the screen-frames and retain their positions, no matter at what angle of inclination the screen-frames may be placed.

Hinged to the casing A above the upper end of each of the screens E is a guide-plate N, adapted to overlap the upper edges of the screen-frames to guide the material from the feed-hooper to the first screen and from one screen to the other, so that it will not pass between thc edges ofthe screens and the cas ing.

P I represent a series of knockers, one for each of the screen-frames and adapted to be actuated by cams l?2 on the extended ends of the screw-rods M3, acting on arms P3 on the rods Pl of the knoekers at regular intervals to subject the screen-frames to a sharp blow at each revolution of the screw-rods to assist in the separation of the material by iniparting a jarring motion to the screen-frame and thereby agitate the material more thoroughly.

Having thus described my invention, what I claim as new is The combination of a framework, an adj ustably inclined screen loosely mounted therein, a revolving reversely-threaded screwrod arranged transversely beneath said screen, brackets mounted on and moved back and forth by said rod, which also forms the fulcrum of said brackets, and brushes resting in said brackets and in contact with said screen, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JAMES PYE.

Witnesses:

C. N. WoonwARD, II. WEBs'rER.

IOC

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