US362027A

US362027A - Jonathan d

Info

Publication number: US362027A
Authority: US
Publication date: 1887-04-26
Anticipated expiration: 1904-04-26

Description

(No Model.)

.D. MAWHOOD.

FEEDING DEVICE FOR ROLLER MILLS.

Patenjaed Apr. 26, 1887.

Inventor 2mm L Witnesses Attorney- UNITED STATES PATENT OFFICE.

JONATHAN 1). MAwHooD, 'oE EIoHMoND, INDIANA, ASSIGNOR TO THE RICHMOND CITY MILL worms, OF SAME rLAoE.

FEEDING DEVICE FOR ROLLER-MILLS.

SPECIFICATION forming part of Letters Patent No. 362,027 dated April 26, 1887.

Application filed February 23,1886. Serial No.192,757. (No model.)

have invented certain new and useful Im-.

provements in Feeding Devices for Roller- Mills, of which the following is a specification.

My invention pertains to improvements in mechanism for securing a proper floor of material from the hopper or hoppers of the rollermill to the rolls thereof, and the same will be readily understood from the following description, taken in connection with the accompanying drawings, in which- Figure 1 is a vertical section through one of the hoppers of a double roller-mill, the plane of the section being at right angles to the axis of the rolls of the mill; Fig. 2, a vertical section through a portion of the hopper in aplane parallel with the rolls of the mill; Fig. 3, a view at the side of the double roller-mill,showing in elevation the two pairs of grinding-rolls and the mechanism by which motion is transmitted to the feeding devices; and Fig. 4, an

1 elevation of one face of the hopper with a portion of the wall of the same broken away in order to exhibit the interior devices.

In the drawings, A indicates the grindingrolls of the mill, of which there are of course two pairs in a double roller-mill; B, the usual feedhopper, disposed above the rolls and arranged to discharge the sheet of material to the grinding-spaces between the rolls of the respective pairs, Fig. 1 illustrating the por; tion of the hopper, pertinent to one pair of rolls only, the portion pertaining to the other pair of rolls being merely the duplicate there of; G, a feed-roll disposed parallel to the grinding-rolls and above the same, and arranged,as usual, to substantially close the contracted base of the hopper; D, a thick board,secured against the inside of the front wall of the hopper, such board reaching from the top of the hopper downward toward the feed-roll and extending horizontally the entire length of the hopper; E, a transverse recess in that surface of the board D which liesagainst the hopperwall, such recess opening downwardly at the lower edge of the board; F, a gate extending the length of the hopper,and hinged at its upper edge to the lower edge of the board D, at the inner face thereofiand impinging itslower base of the hopper to be entirely closed when the gate thus impinges upon the feed-roll; G, a flat curved spring,disposed vertically within the recess E, the lower end of the spring bearing inwardly against the gate and tending to brace thegate against the feed-roll, a curve in the spring above its lower end bearing against the inner face of the hopper-wall, and thereby forming a fulcrum on which the spring might rock; H, an adjusting-bolt engaging the upper end of the spring, and projecting outwardly therefrom through the hopper-wall, such bolt serving in preventing the downward displacement of the spring, and also as a means by which the upper end of the spring may be adjusted toward the hopper-wall J, a tubular rake-shaft supported in hearings in the end walls of the hopper above the feedroll, and'fitted for reciprocation in such bearings; K, a rake or comb somewhat shorter than the hopper, and secured to the tubular rake-shaft so as to reciprocate therewith, the teeth of the rake projecting downwardly to near a point where the gate impinges upon the feed-roll; L, a spring consisting of a flexible bar having its upper end secured in a spring-holder attached to the inner surface of the board- D, and having its lower end connected with the rake, whereby the spring tends to resist the endwise n10- tion of the rake-shaft in one direction; M, a face-cam secured to an end of the shaft of the feed-roll, which projects outside the hopper, the face of the cam presenting itself to one end of the tubular rake-shaft; N, a rod, preferably of wood, disposed within the tubular rakeshaft, and having an end projecting beyond the end of the rakeshaft into direct contact with the face of the cam; O, a set-screw in the end of the tubular rake-shaft opposite the end presented to the cam, such set-screw serving to regulate the projection of the rod beyond the end of the rake-shaft; P, a pulley journaled upon the outside of one end of the hopper, centrally above and between the outwardly-projecting shafts of the two feed-rolls of the mill; Q, pulleys upon such projecting ends of the shafts of the feed-rolls, these pulleys being just outside the cams, previously referred to; R, the usual feed-driving pulley,

edge against the feed-roll, thus causing the secured to the shaft of one of the grindingrolls; S, a tightening-pulley disposed in the plane of the pulleys Q, and to one side of or beyond those pulleys, such tightening-pulley being supported by any suitable attachment to the hopper or frame of the mill, the pulley being so disposed that a belt passing from it to the most distant one of the pulleys Q will clear near the bottom of theintermediate pulley Q; T, a belt engaging the pulleys R and P, and provided, preferably, with a tightener, this belt serving in transmitting motion from one of the grinding-rolls to the pulley P; U, a pulley connected with and revolved by the pulley P, and of smaller size than the pulley P; V, a belt passing from the tighteningpulley S to and partially around the pulley Q most distant from the tightening-pulley, thence backward and under and partially around the intermediate pulley Q, thence partially around the pulley, and thence to the tightening-pulley S again; and W, the holder of the spring L, such holder consisting of a pivoted lever, to which the spring is secured, and provided with a segmental slot, by means of which the lever may be adjusted upon its pivot and then secured, thus putting more or less tensional flexure upon the spring.

The tension of the spring G tends to keep the gate against the feed-roll. The pressure of material within the hopper tends to press the gate open so that the sheet-like stream of material may flow downward to the grindingrolls. The rotation of the feed-rolls serves in urging the sheet of material past the gate. The adj usting-bolt H serves in regulating the tension of the spring, and thereby the resistance against which the gate has to be opened. The curve in the spring forms a fulcrum upon which the spring is strained when the adj usting-bolt is operated. The board D serves in supporting the gate a distance inward from the hopper-wall, and the recess E in the board serves to receive the spring and prevent its sidewise displacement.

The rake serves to distribute the material as it passes the opening between the gate and feed-roll. The spring L serves to press the rake in one direction toward the cam, while the cam produces the motions of the rake in the opposite direction. Theadjustable spring-holder-WV serves in adjusting the tension of the spring L, so as to press the rake toward the cam with sufficient but not improper force. The rod N serves in preventing the wear directly upon the end of the rake-shaft, and, if of wood, serves in securing noiselessness and durability at the point of contact with the cam, and the set-screw 0 serves in adjusting the projection of the rod, in order to compensate for wear upon its end, and in order to permit an adjustment of the relative endwise position of the rake within the hopper.

The belt T, engaging the pulleys R and P, serves in transmitting motion to the pulley U; and the belt V, arranged as described, in

connection with its pulleys, serves in transmitting motion from the pulley U to the two feed-rolls, whereby motion, at proper velocities, is transmitted to the two feed-rolls in opposite directions, and by means of open belts entirely.

I claim as my invention 1. A feed device for a rollermill, comprising a hopper, a feed-roll atthe base thereof, a hinged gate fitted to have its lower edge rest against said roll, a curved flat spring bearing with its free end against said gate and resting the convex portion of its curve fulcrum-like against a fixed portion of the hopper, and an adjusting-bolt engaging a fixed portion of the hopper and the fixed end of said spring, substantially as and for the purpose set forth.

2. A feed device for a roller-mill, comprising a hopper, a board, D, secured against the inner wall of the hopper and having a transverse recess, E, a feed-roll at the base of the hopper, a feedgate, F, hinged to the front lower portion of-said board, a spring disposed behind said feed-gate and projecting upward into said recess, and an adj usting-bolt for securing and adjusting the spring, substantially as and for the purpose set forth.

8. A feed device for a roller-mill, comprising a hopper, a feed-roll at the base thereof, a feed-gate, a rotary shaft carrying a face-cam, a reciprocating tubular shaft carrying a rake and presenting its end toward the face of the cam, a spring arranged to press the rake toward the cam, a rod disposed within the rakeshaft and projecting endwise therefrom, and a screw engaging the rake-shaft and rod and serving to adjust the projection of the rod, substantially as and for the purpose set forth.

4. A feed device for a roller-mill, comprising a hopper, feed-roll, feed-gate, reciprocating rake, a cam or equivalent means for reciprocating the rake, a spring-holder pivoted to the hopper and provided with a slot and bolt by which it may be adjusted upon itspivot, and a spring engaging the spring-holder and rake and adapted to be adjustably fixed by the pivotal adjustment of said springholder, substantially as and for the purpose set forth.

5. In a feed device for a double roller-mill, the combination, substantially as set forth, of two pairs of grindingrolls, a feed-hopper, a feed-roll above each pair of grinding-rolls, pulleys P and U, disposed over and between the feed-rolls, pulley R upon the shaft of one of the grinding-rolls, belt T, engaging pulleys P and R, pulleys Q upon the shafts of the feed-rolls, pulley S beyond the pulleys Q, and belt V, engaging in order the pulleys S, Q Q, and U.

In testimony whereof I affiX my signature in presence of two witnesses.

V JONATHAN D. MA\VHOOD. \Vitnesses:

J AS. W. NIoHoLs, W. T. DENNIS.