US308254A - Roller - Google Patents

Description

(No Model) 3 Sheets- Sheet 1.

O. T. HANNA.

ROLLER GRINDING MILL. 110.308.25 1; Patented Nov. 18. 1884.

1 'ATTORNIQ N4 PEIERS. Phoh ulhogrnphun Wuhinglon. 11c.

(No Model.) I 3 Sheets-Sheet 2.

O. T. HANNA.

ROLLER GRINDING MILL. No. 308,254. Patented Nov. 18, 1884;

WITNESSES: I INVENTOR,

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N 0.. T. HANNA.

ROLLER GRINDING MILL.

- Patented Nov. 18, 1884.

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WITN ESSE'S:

CYRUS T. HANNA, OF ALLEGHENY, PENNSYLVANIA.

ROLLER GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 308,254, dated November 18, 1884.

Application filed May 13, 1884. (No model.)

To all whom it may concern:

Be it known that I, GYRUs T. HANNA, a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented or discovered certain new'and useful Improvements in Roller Grinding-Mills, of which improvements the following is a specification.

In the accompanying drawings, which make part of this specification, Figure 1, Sheet 1, is an end view, partly in section, of a when grinding mill embodying my invention; Fig. 2, Sheet 2, a side View in elevation of the same; Fig. 3, a vertical section, on an enlarged scale, through one of the bearings of the feedroll driving-shaft; Fig. 4, Sheet 1, a transverse section through one of the bed-plates of the frame, with a roll-bearing in elevation; Fig. 5, Sheet 3, a side view in elevation of one of the housings of the roll-adjusting mechanism; Fig. 6, an end view in elevation of the same, as seen from the left; ,Fig. 7, a vertical longitudinal central section through the same; Fig. 8, a transverse section through the same at the-line ax of Fig. 7; and Fig. 9 a view,

partly in elevation and parlyin section, of the adjacent or abutting portions of the wormshafts and hand-wheels of one of the adjusting mechanisms.

My present invention, which relates to roller grinding-mills of the class exemplified in Letters Patent of the United States Nos. 253,698 and 272,043, granted and issued to me under dates of February 14, 1882, and February 13, 1883, respectively, is designed to provide for eifecting a closer and more accurate adjustment of the rolls toward and from one another than has heretofore been practicable; to enable such adjustment to be effected upon one end of the roll independently of the other or coincidently upon both ends, as desired; to provide improved means for the vertical adjustment of the roll-bearings, and to enable the tightening-pulley to be accurately adjusted in proper position forcarrying the drivingbelt. To these ends my improvements consists in certain novel devices and combinations, hereinafter fully set forth and claimed.

In the practice of my invention the operative mechanism is mounted upon a frame, 1, having horizontal bed-plates 2 on the top of each of its vertical side members, upon which are supported the bearings or pillow-blocks 3 of two or more pairs or sets of crushing and grinding rolls, which are cast together with or fixed upon shafts at 5 6 7.

In my Letters Patent Nos. 253,698 and 27 2,043 aforesaid the vertical adjustment of the rolls was effected through sliding wedgeplates,which supported the roll-bearings, said wedge-plates being inclined on their lower faces, resting on corresponding inclines on the bed-plates of the frame, and I have herein illustrated such"constructionas applied to the bearings of the roll-shafts 4 and 5.

Under my present invention, which, in this particular, is shown herein as applied to the bearings of the roll-shafts 6 and 7, the wedgeplates and their accessories are dispensed with, and a curved or segmental recess, 8, is formed transversely in the bottom of each of the bearings 3, which are supported at or near each end of their bases by adj Listing-bolts 9, engaging female threads in the bed-plate 2. The bolts 9 are turned off spherically at their ends to a radius equal to or slightly less than that of the segmental recesses 8 of the bearings, and it will thus be seen that the latter are free to rock or vibrate upon the bolts as pivots in any vertical adjustment in which they may be placed by the raising or lowering of the bolts, and can adapt themselves with corresponding nicety to the alignment of the journals which they support. A bolt, 10, secured to each bearing, projects downwardly therefrom through the bed-platein line with the center of the roll shaft, and is provided with a main and alock 'nut below the bed-plate, by which the bearing may be secured in any adjusted position.

The horizontal adjustment of the roll-shaft is, as in my prior patents above referred to, effected through threaded stems connected to the shaftbearings and movable in opposite di rections by nuts. In lieu, however, of rotat ing the nuts of said stems directly by a wrench or handle, as in my prior eonstructions,whieh operation failed to afford the exactness of adj ustment which is desirable, aswellas necessitated the separate manipulation of each end of the shaft, I provide under my present invention means whereby any desired degree of variation, however slight, of the distance be tween the axes of the rollshaft may be readily and accurately attained, and also enable IOO the adjustment of the opposite ends of the shafts to be either independently or coincidently effected, as now to be described.

Inasmuch as one roll only of each pair need be movable in making the horizontal adj ustment, and as the outer rolls are most conveniently accessible for the purpose, the adjusting mechanism is applied only to the bearings of the outer rollshafts 4 and 7. Ahorizontal stem, 11, which is provided wit-h an external thread at and adjacent to its outer end, is connected to each of the hearings or pillow-blocks 3 of the roll-shafts 4 and 7, the connection being by preference made in the manner shown in Fig. 1-that is to say, by the engagement of a head or projection, 12, on the inner end of the stem 11 with a recess, socket, or projection on the bearing 3. The stems 11 pass freely through externallythreaded sleeves 13, which are fixed in vertical standards or housings 14 on the outer ends of the bed-plates 2, and also pass freely through casings 15, secured to said housings.

A disk, 16, having a circular series of alternate projections, 17, and depressions, acting as cams on its inner face, is mounted freely on each of the stems 11, exterior to a housing, 14, its cam-face entering a recess in the housing and engaging a cam-face of corresponding form on the outer end of the sleeve 13, which is fixed therein. The function of the disk 16 will be presently explained. Along nut, 18, en gages the threads of each stem 11, exterior to the disk 16, and a worm-wheel, 19, is fitted upon a key or feather, 20, on the nut18, which is thus free to move longitudinally within the worm-wheel 19 while engaged with said wheel, so as to rotate therewith in either directionin which it may be turned. A worm-shaft, 21, on which is formed a worm, 22, engaging the worm-wheel 19, is mounted in bearings 23, secured to the casing of each worm-wheel; and the two worm -shafts, which thus actuate the worms at each end of the outer rollshafts, 4 and 7, are arranged in line axially, and are adapted to be turned by the operator either coincidently or independently, as desired. To this end a hand-wheel, 24, is secured upon each worm-shaft adjacent to thecasing within which its worm rotates, and hand-wheels are fixed upon the meeting ends of the two worm-shafts of each rollshaft. Said worm-shafts are maintained accurately in line by a central cylindrical projection, which is formed upon the end of one shaft and enters a corresponding recess in the other, and the adjacent faces of the handwheels 25, which are plane and perpendicular to the axial line of the shafts, are located as closely as practicable together without being in contact. It will therefore be seen that the operator can, by applying his hand to the two adjoining hand-wheels 25, simultaneously rotate bot-h the worm-shafts of each roll-shaft in either direction, and thus effect the simultaneous adjustment through the induced longitudinal movement of the stems 11 of both bearings of the roll-shaft, or, by the separate manipulation of the hand-wheels 24, he can adjust either bearing of the shaft, as may be desired. It will be further obvious that by the actuation of the nuts 18 through the worms and worm-wheels an accuracy of adjustment will be obtained which is materially greater than that effected by the direct action of a wrench or handle, as heretofore practiced.

The duty of the cam-faced disks 16 is, as in my patents before referred to, to enable one of the rolls of each pair to he moved entirely clear of the other from time to time, when material is not passing through the rolls, and thereafter to be returned to operative position, when required, without varying the adjustment. To this end an arm, 26, is fixed to each of the disks 16, andthe arms 26 of the disks of each of the outer roll-shafts are coupled by a link, 27, so as to be movable coincidently by the operator. In the partial rotation of the disks 16 their cam projections 17, moving upwardly upon the corresponding inclines of the sleeves 13, force the disks outwardly, the latter bearing against and carrying with them in their outward movement the nuts 18, stems 11, and the connected bearings 3 of the outer roll-shafts. The latter are returned to operative position upon the release of the stems 11, in the movement of the disks 16 in reverse direction, by helical springs 28, surrounding the stems 13, and bearing at one end against the outer bearings, 3, and at the other end against shouldered sockets 29, fitting freely on the sleeves 13. The sockets 29 abut against tightening-nuts 30, engaging the threads of the sleeves 13, and fixed in position by jam-nuts 31.

The rolls of each pair are, as is usual in roller-mills of the character to which my im- I provements relate, driven at different velocities, respectively. The arrangement of belts and pulleys for driving the rolls need not be herein at length illustrated and set forth, as the same does n.ot,pcr se, constitute part of my present invention, and is, moreover, fully described in my Letters Patent No. 253, 698, aforesaid. The driving-belt passes from the main or counter shaft of the prime mover around a pulley, 32, on the shaft of one of the faster moving rolls, thence around a pulley, 33, on a shaft, 34, which may be termed the driving shaft of the slower-moving rolls, and thence around a pulley, 32, on the shaft of the other faster-moving roll of the other pair. The slower-moving rolls are driven by a belt passing around a pulley, 35, on the shaft 34, thence around a tightening-pulley, 36, and thence around pulleys 37 on the shafts of the slowermoving rolls. The feed-rolls are rotated from a feed-roll-driving shaft, 38, mounted in bearings 39 on the casing of the mill, and carrying a pulley, 40, around which passes a belt from a pulley, 41, on the shaft of one of the slower-moving rolls.

IIO

To enable the tightening-pulley 36 to be adthe driving-belt of the slower-moving rolls. it is mounted freely upon a shaft, 42, which is fixed in an arm, 43, projecting from a sleeve or socket, 44, which fits on a horizontal supporting and adj usting, bar, 45, which is movable endwise in bearings in the frame 1 of the mill. The socket 44 may be adjusted both longitudinally and axially on the bar 45, and secured in adjusted position by clamping-screws 46, engaging threads in the socket and bearing on the shaft, and the position of the tight ening-pulleymay thus be accurately regulated in conformity with the proper angle of the drivingbelt. The feed-roll shafts 47 48 are driven bya pinion, 49, on the shaft 38, said pinion engaging a gear, 50, on the feedroll shaft 47, which gear in turn engages a gear, 51, on the feed-roll shaft 48.

To enable the rotation of the feed-roll shafts to be readily stopped and resumed from time to time, as required in the operation of the machine, the pinion 49 is mounted freely upon the feed-roll-driving shaft 38, and is made fast or loose thereon, according as the feed-rolls are desired to be driven or to remain stationary, by a clutch, 52, sliding on a key or feather, 53, on the shaft, and adapted to engage corresponding clutch projections, '54, on the adjacentside of the pinion 49. The clutch is moved toward and from the pinion by a shipping-lever, 55, pivoted to the bearing-frame of the shaft 38, and having a forked arm engaging a groove on the clutch, said lever carrying upon its outer end a counter-balance, 56, by the gravity of which the clutch is maintained in position longitudinally upon the shaft when either engaged wit-h or disengaged from the pinion.

I claim herein as my invention- 4 1. Inarollergrinding-mill, the combination of a bed-plate, a pair of adjusting-bolts engaging internal threads therein and having rounded ends, a roll-bearing supported adjacent to each of its sides upon said adj ustingbolts, and having a transverse segmental groove to receive the rounded ends thereof, a locking-bolt fixed to the bearing between the adjustingbolts and passing freely through the frame, and a nut engaging a thread on said locking-bolt, substantially as set forth.

2. In a roller grinding-mill, the'combination of a pair of roll-bearings, a bed-plate provided with standards, threaded stems connected to said bearings and carrying nuts which transfer applied pressure to said standards upon the bed-plate, two worm-wheels, each adapted to rotate one of said nuts, and two worm-shafts mounted in line axially, each of said shafts carrying a worm engaging one of said wormwheels, and a pair of hand-wheels, one of the hand-wheels of each worm-shaft being fixed thereon adjacent to the adjoining worm-shaft, and the other handwheel at a point nearer to its worm-wheel, these members being combined for joint operation to effect either. the separate or the conjoined rotation of the wormwheels and nuts, substantially as set forth.

3. In a roller grinding-mill, the combination of a pair of worm-shafts mounted in line axial- 1y, one of said shafts having-a cylindrical projection concentric with its body, which enters a corresponding recess in the adjacent end of the other shaft, a pair of operating hand wheels, each secured upon one of said shafts, said wheels being in such proximity as to be adapted to simultaneous rotation by an operator, a pair of hand-wheels, each fixed upon one of said shafts at a point closer to the worm thereof than the hand-wheel first-specified, a pair of roll-bearings, and mechanism, as ,described, for adjusting said bearings by the rotation of the worm-shafts, substantially as set forth.

4. The combination of a threaded adj ustingstem, a nut thereon, a worm-wheel fitted by a key or feather on said nut, a cam-faced disk fitting around said stem and bearing at one side against the nut and at the other against a corresponding face in a standard or housing, a casing inclosing said worm-wheel and disk, and secured to the housing, and a worm engaging said wornrwheel and supported by a bearing-casting secured to said casing, substantially as set forth.

In a roller grindingmill, the combination of an adjusting and supporting bar, mounted with the capacity of longitudinal movement in bearings in the frame, a sleeve or socket fitting freely on said bar, so as to be adjustable axially thereon, clamping-screws engaging threads in the socket and bearing on the bar, and a tightening-pulley mounted on a shaft fixed in SllCl socket, substantially as set forth.

In testimony whereofl have hereunto set my hand.

CYRUS T. HANNA;

\Vitnesses:

J SNowDEN BELL, S. HARVEY THOMPSON.

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