US289518A

US289518A - Daniel e

Info

Publication number: US289518A
Authority: US
Publication date: 1883-12-04
Anticipated expiration: 1900-12-04

Description

(NoModeL) 1). OWLING.

FEED MECHANISM FOR ROLLER MILLS; r

No. 289,518. I PatentedDeo. 4,v 1883..

UNIT D STATES PATENT OFFICE.

DANIEL n. BOWLING, on NEW YORK, N. Y.

FEED MECHANISM FOR ROLLER-MILLS.

SPECIFICATION forming part of Letters Patent No. 289,518, dated December 4, 1883.

' Application filed September 4, 1882. (No model.)

To all whom it may concern Be it known that I, DANIEL E. DOWLING, of

' Brooklyn, inthe county of Kings and State of New York, have invented certain new and useful Improvements in Feed Mechanism for R011- er-Mills, of which the following is a specification.

a The aim of thisinvention is to produce a mill wherein the material will be subjected to a con stant and uniform grinding action from one end of the rolls to the other. i

In the art of milling as carried on at the present day it is the general custom to reduce middlings and similar materials-the result of previous reductions of the grainby passing the same between parallel rolls the surfaces of whichtravelincloseproximity to each other.

, In order to secure a uniform reduction of the in, and the varying conditions of the atmos-' phere, the material will atone time feed or flow with great freedom, while at othertimes it will have a tendency to become compacted and to resist all attempts which maybe made to cause its delivery inthe form of a sheet. The result is that inall millsknown inthe art up to the present day the material is de1iv-- ered from the hopper between the rolls in an irregular or, uneven manner, the delivery being more rapid at one time than at another, and the delivery frequently ceasing at one pointin the length of the rolls, or at one end of the rolls, while it continues at the opposite end. Inasmuch as the rolls are always urged toward each other by means of springs,weights, or equivalent pressure devices adjusted to secure the proper grinding action when a uniform feed occurs from end to end of the rolls,

" pit followsthat whenever the feed ceases or diminishes at one end of the rolls [only, the: rolls will be urged nearer together at that end than at the other, thus producing a varying ofthe length of the rolls causes the-entire strain of the pressure devices tobe exerted upon a comparatively small surface or upon a comparatively small amount of material, thus subjecting the same to an excessive Again, adiminished feed resulting in a diminished resistance to the rolls, their speed is liable to increase beyond the desired limit, and thus exert an injurious influence upon the material.

It is to avoid all of the above-mentioned difficulties, and secure,nnder all circumstances and conditions which are encountered in practice, ;a uniform delivery of the material between the rolls from one end to the other, that my invention is designed.

To this end the invention consists, essentially, in the combination,with two grinding-rolls, of a feed-hopper extending from end to end above the same, a feedroll locatedbeneath the mouth ofthehopper and above the grinding-rolls, and an agitator located within the hopper, and prolvided with teeth or fingers arranged to reciprocate immediately above the surface'of the feed-roll, and lengthwise thereof. The feedroll receives a constant forward rotation, so that it tends to deliver the material through the throat or outlet of thehopper,while atthe same time the longitudinal reciprocating agitator serves to loosen and disintegrate the material and distribute the same in a free con- :dition upon the surface of the feed-roll in such manner ,that its delivery from the hopper is effected in athin continuous sheet, which is delivered from the surface of the feed roll directly to the surface of thegrinding-rolls thereunder. I

The invention also consists in certain minor features of construotion,wl1ich will be hereinafter explained.

pressure, whereby its quality is impaired.

'above the surface of the feed-roll.

Referring to the accompanying drawings, Figure 1 represents a vertical section through the upper portion of a grinding-mill having my improvement applied thereto. Fig. 2 is a longitudinal vertical section of the same in line with the aXis of the roll.

As regards the construction of the grindingrolls, their arrangement in relation to each other, and the construction and arrangement of the mechanisms by which their adjustment is secured and their rotation effected, they may be of any usual character, a great number being familiar to all. persons skilled in the art.

Referring to the drawings, A A represent two cooperating grinding-rolls; B, the frame or body of the machine,in which the rolls are mounted; O, the feed-hopper, located at the top of the frame above the grinding-rolls, and D ahorizontal feed-roll located beneath the mouth or outlet of the hopper. As shown in the drawings, the feed-roll is constructed with a smooth or substantially smooth surface, and arranged so that it may be revolved by suitable gearing, so as to carry its upper surface outward beneath the feed throat or opening a in the side of the hopper, for the purpose of delivering the material from the hopper through said opening, and effecting its discharge directly downward between the grind ing-rolls. The side of the hopper is provided with a vertically-movable gate, K, connected to an adjusting-screw, by means of which it may be raised and lowered, so as to diminish the width of the throat or outlet opening Special care is to be observed in constructing the parts,

that an unbroken throat or opening shall exof the two.

' T roll.

tend between the edge of the gate and the surface of the feed-roll on the delivery side only, in order that a continuous or unbroken sheet of material may escape and be carried outward on the surface of the roll on that side, while the escape of the material on the opposite side which lies close to the roll is prevented.

Within the hopper. above the feed-roll and parallel therewith, I mount a non-rotating bar or rod, F, arranged in such manner that it may be reciprocated endwise, or, in other words, in the direction of the axis of the feed- This bar, which may be operated by any suitable means, is preferably provided with a depending arm, Z, the lower end of which engages in a sinuous slot in a wheel or hub; J, secured to the journal of the feedroll. This arrangement imparts a reciprocating motion from the rotary feed-roll to the bar F, and insures a constant relative motion The reciprocating bar F is provided with a series of depending teeth or fingers, the lower ends of which terminate in close proximity to the upper surface of the struct them in pairs by bending elastic wires into a {1 form, and to insert them through holes in the bar F from the upper side, and secure them therein by means of a plate, G, applied above them and fastened in place by screws or bolts H. This construction admits of the teeth which may become broken or bent being readily removed and replaced by others.

The essential feature of the invention consists, as before indicated, in combining with two grinding-rolls and immediately above the same the feed-roll, the hopper, and the agitators moving lengthwise above the feed-roll. I am aware that a feed-roll has been combined with rotary agitators above the same, and with agitators arranged to vibrate in planes transverse to the aXis of the said roll, and also that spiral agitators or screws have been arranged above the surface of a feed-roll in a grinding-mill, and to such combinations I lay no claim. In practice it has been found that they fail to secure that uniformity of feed which is attained by the peculiar combination constituting the subject of my invention.

I am aware that in machines for grading and separating grain, and in machines for sowing wheat, hoppers have been combined with agitating and feeding mechanism of various kinds therein; but I am not aware that any one has hitherto produced an organized roller-mill wherein feed mechanism such as herein described is arranged to deliver the material in the required condition between the grinding-rolls, from end to end thereof.

Having thus described my invention, what I claim is 1. In an organized grinding-mill, the combination of two horizontal grinding-rolls, a rotary feed-roll extending lengthwise above the same, a hopper located above the feedroll, and having at one side only a feed throat or passage above said roll, an agitator located within the hopper, and provided with teeth terminating near the upper surface of the feedroll, and mechanism for reciprocating said agitator in the direction of the axis of said feedroll, whereby the treatment of the material in a continuous uniform sheet between the grinding-rolls is effected.

2. The improved grinding-mill consisting of the two co-operating horizontal grinding rolls, the horizontal rotary feed-roll, the hopper having on one side an outlet between its lower edge and the upper surface of the feed roll, the vertically-adjustable gate to control said outlet, the feed-bar above the feed-roll, provided with depending teeth, and means, substantially as described, for reciprocating said bar lengthwise of the feed-roll, whereby the grinding of the material in a continuous uniform sheet from end to end of the feed-rolls is insured and the rate of feed rendered controllable at will.

3. The combination of the two grindingrolls, the feed-roll, the hopper, with an out- 1et at one side of thefroll, the gate, and the toothed agitator centrally located within the agitator-bar centrally located Within the hophopper and extending lengthwise above the 10 per, and provided with teeth terminating at feed-r011, and mechanism for reciprocating or near the feed-throat, and means for recipsaid agitator in a lengthwise direction.

5 rocating said bar endwise. DANIEL E. DOWLING.

4. In a grinding-mill, the combination of Witnesses: two grinding-rolls, the feed-r011 above the PATRICK FARRELL, same, a hopper above the feed-r011, and a ROBERT F. CRAWFORD.