US1359357A - Grinding-mill - Google Patents

Description

J. A; GERWEN. ;G RINDING MILL.

APPLICATION FILED JAN. 22, 1919.

Patented Nov. 16,1920.

S nWd y j a Germ)? J. A. GERWEN.

GRINDING M|LL.. APPLICATION FILED JAN. 22. 1919.

1,359,357. PatentedN0v.16,1920.

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GRINDING MILL.

APPLICATION FILED m4.22. 1919.

1,359,357. PatentedNov. 16,1920.

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APPLICATION FILED 15W. 22, 1919- 1 1,859,357, Patented N0v.'16,1920:

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fnvenfc; \fazz'ua d- (/erwen UNITED STATES PATENT OFFICE.

JULIUS A. GERWEN, 0F MOLINE, ILLINOIS, ASSIGNOR T0 MOLINE MILL MANUFAC- TURING COMPANY, OF MOLINE, ILLINOIS,

A CORPORATION OF DELAWARE.

GRINDING-MILL.

Specification of Letters Patent.

Patented Nov. 16, 1920.

To all whom it may concern.

Be it known that I, JULIUS A. GERWEN, a subject of Germany, and a resident of Moline, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification.

My invention relates to grinding mills for grinding cereals into flour or coarser products.

My invention involves several features of improved construction, arrangement and operation and particularly improved supporting and bearing structure for the grinding rolls in which smooth, corrugated or otherwise roughened rolls can be interchangeably used and readily withdrawn or installed without disturbing the grinding adjustment. This is a valuable and desirable feature as it enables the quick conversion of a flour mill into a cereal mill for producing coarser products, or the conversion of a cereal mill into a flour mill, all that is necessarybeing the removal of one set of rolls and the insertion of another, the grinding adjustment being automatically maintained, which eliminates the necessity of laborious setting and adjusting operation after interchange of rolls.

A mill unit incorporating the various features of my invention is shown on the accompanying drawing, in which Figure l is a front elevational View with parts in vertical diametrical section. and others broken away to more clearly reveal the construction and arrangement,

Fig. 2 is a view of the right end,

Fig. 3 is a view of the left end,

Fig. 4 is a sectional View on plane 44, Fig. 1, and

Fig. 5 is a right end vlew showing the rolls removed.

The machine supporting frame comprises the rectangular lower or base section 1 and the top or cover section 2 detachably secured thereto. A shaft 3 extends transversely through the lower part of the top section and is journaled in the bearing frames 4: and 5 mounted on and secured to the shelf extensions 6 and 7 on the base part 1. The shaft also extends through the hub extensions 8 and 9 on the side walls of the top frame 2 and between these hubs is the feed roll 10 secured to the shaft by set 5 screws 11. Extending transversely between the side walls of the top frame 2 and diagonally upwardly to the top thereof from the rear side of the feed roll is the wall 12 forming part of a feed funnel whose upper front wall is formed by the wall 13. A shaft 14 above and parallel with the shaft 3 is journaled in the side walls of the top frame 2 and has secured thereto the apron 15 which extends from the lower end of the wall 13 downwardly and terminates infront of the feed roll 10. The grain is charged through the opening 16 in the top of the frame 2 and flows down the walls 12 and 13 onto the feed roll which rotates in the direction indicated by the arrow, and the grain is discharged through the gap between the apron 15 and the feed roll, the surface of this roll being roughened or corrugated to facilitate discharge of the grains. To prevent too rapid feeding of the grains the apron 15 is yieldingly held toward the feed roll but out of contact with its roughened surface, it being yieldingly held with its ends against the hubs 8 and 9 by means of a weight 17 on the arm 18 extending from the shaft 14. As the feed roll travels its roughened surface will engage with and facilitate the passage of the grains past the apron but too rapid discharging will be prevented by the yieldable resistance of the apron. To prevent grains from sticking to the feed roll and being carried around therewith a guard plate 19 encircles the lower part of the roll and is supported from the wall 12 (see Fig. 4).

At its left end the shaft 3 has the gear 20 secured thereto. The bearing frame 4 has the upward extension 21-at its inner end from which extends the stub shaft 22 parallel with the shaft 3 and journals on its outer end the hub 23 on which are secured the pulley 24 and the gear pinion 25. Between the hub 23 and the frame 21 the arm 26 is mounted on the shaft 22 and at its outer end has the pin 27 on which is mounted the transmission gear 28. When the arm 26 is down, as shown in full lines Fig. 3, the transmission gear will be in mesh with the pinion 25 and the gear 20,'and when the arm is swung upwardly, as shown in dotted lines Fig. 3, the transmission gear will be out of mesh.

In the rear wall of the lower frame 1 is the opening 29 which communicates with the side openings 30 and 37, respectively, in the side walls of the frame but a closure r 43 and 44, respectively.

side, walls '33 and 34 is provided for closing these openings. Suitablecleats 35 are prov 'vided for locking this closure frame in closed position. The base frame 1- a t its front has similar openings 36, 37 and 38- adapted to be-closed bya frame comprising; the front wall 39 and the side walls 40 and 41, the frame being held an place by suitable cleats 42.

The side walls of the frame 1 at their upper ends have the enlargements or lugs To the rearof the center line these lugs support the pins and 46 on which the semi-circular yoke frames 47 and 48 are pivoted at the ends of their upper legs; These yoke frames are similar and eachliasthe opposed set screws 49 and 50 extending through their ends and a set screw 51 extending radially through the base. These set screws in the frames re spectively support. and aline therein the bearing frames 52 and 53 which are pro vided with detachable companion bearing members or caps 54 and 55, respectively. Asbest shown in Fig.2, the bearin frames 52 and 53 have the elongated seating pockets 56 and 57 for the set screws 49 and '50 so that the bearing" frames can be adjusted horizontally aswell as :vertically in the yokes. The seating pockets 58 the respective bearing frames'for the set screws 51 are likeWiseenlargedjto permit of the adj usting movements of the bearing frame. To lock the set screws 51 in adjustedfposition lock nuts 59 are shown provided and for locking the set screws 49 and 50 lock screws 60 are provided Extending through the bearing frames in the yokes 47 and 48 is the shaft 61 to which is secured, the grinding roll 62' which is ,within -the' frame 1 and QXi-QIIClS'bG- tweenthe side walls thereof, and the bearing structures in theyokes each supports and confines a ball bearing frame 63 for reducing the friction. Theside walls 33 amt-34 of the rear removable housing section are cut away to leave the semi-circular spaces which register with sifnilarspaces 65 in the 1 tion by tively, which sidewalls of the frame'l to form openings throughwhich the ends of the shaft 61 pro ject when the ,yokes are down to support the grinding roll in operative position. The yokes are locked inclosed orv operative posimeans "of screws 66 and 67, respecpass through the lower ends of the yokes and thread intothe openings 68 and 69 in thesidewalls of the frame 1.

Extending throu h the body. part 1 and journ'aled in'the side wall enlargements 43 and '44 thereof is the shaft 70 which; at :its vouterends hastheextensions or pins 71 and 7 2 which areeccentric with reference to the shaft axis... O'nZ these eccentric pins are pivotedftheyoke framesl't3 andf74, respectively,

whose construction is similar to that of" the recess? yokes 47 and 48, each yoke having the set screws 75,7 6 and 7? for adjustably support ingthe bearing frame 78 provided with a cap 79, a roller bearing 80 being within each bearing structure. Journaled in these bearings are the shaft ends 81 and 82 which support the, front grinding roll 83. To adjust for the ro er contact or 'a between the t:

grinding rolls" 83' and 62 when the .yoke frames are down, screw abutment rods 84 and 85 are threaded through the lower'ends ofthe yokes 7 3 and 74 to abut against the lugs 86 and 87 on the frame 1, the abutment rods being provided each with a hand wheel 88 to facilitate turning thereof, and with a lock nut 89 to lock them in adjusted position. To yieldingly lock the yokes in adjusted position and to yieldingly hold the rolls toward each other during grinding,

the rods 90 and 91 extend rearwardly from the lower ends of the yokes 7 3 and 74 and through the lugs 86 and 87, the rear ends of the rods being provided each with an abutment head'92 and washer 93 between which washer andthe respective lug the compression spring 94 encircles the rod; At its front end each rod threads through a nut 95 held against turning in the pocket 96 in the respective yoke frame. This threaded engagement enables the force of the springs era) be adjusted. The springs 94 pulling on the yoke frames 73 and 74 tend to hold the rolls in their proper grinding position but will yield to permit separation of the rolls so as to prevent injury thereto. The abutment rods 84 and 85 determine the gap between the rolls or the degree of pressure exerted against the rolls by the springs 94.

The rollsare driven at differential speed, the shaft 61 of the rear roll having the gear 97 thereon and the shaft end '81 forthe front roll having the larger gear 98 thereon, the shaft 61 of the rear roll being drivenin any desired manner. As shown, it has secured thereto a coupling member 99by means of which it maybe coupled to the corresponding shaft of an adjacent mill unit. To protect .the gears 97 and 98 upper and lower housing sections 100 and 101 are provided,

the lowerhousing section being supported on and secured to a standard 102. The up- .per'section 100 of the housing is removable is .a lever 105Yby means of which the shaft may be rotated. Such rotation of the shaft will cause the eccentric pins to gradually swing the yoke frames so that very fine and accurate adjustment can be made of the grinding rolls during running thereof, and when the shaft is turned suflicientlythe yoke frames may be swung a sufficient distance to cause unmeshing of the gears 97 and 98 so that the rotation of the front roll 83 is stopped. The lever 105 carries a bar 106 pivoted on the ears 107 and having at its inner end a latch pin 108, a spring 109 interposed between the outer end of the plate and lever tending to extend the pin 108 through the opening 110 in the inter. Secured to the side of the housing frame 1 is the segment 111 having a series of holes 112 for receiving the pin and for locking the lever 105 in various positions of adjustment. By pressing against the outer end of the plate 106 the pin is readily withdrawn to permit swing of the lever.

Provision is also made to stop feeding of grain when the grinding rolls are separated and their gears unmeshed. As best shown in Fig. 3, a lever 113 extends fromthe arm 26 which carries the transmission gear 28 and a chain or cord lla'connects the outer end of this lever with the periphery of the collar 115 secured to the adjacent end of the shaft 70. The chain is sufficiently slack so that it will be made taut only when the lever 105 approaches its uppermost position and the grinding rolls are separated too far for grinding. As the chain tightens the arm 26 rotates and unmeshes-the gear 28 from the pinion 25 and gear 20 so that the feed roll 10 stops rotating. After the lever 105 is lowered a distance the chain will be slackened suficiently to permit the transmission gear to drop back into mesh to reconnect the feed roll for rotation.

"With my improved construction and arrangement the grinding rolls can be accurately located in their supports and adjusted for grinding cooperation. By means of the lever 105 and the eccentric connection of the yoke frames for the front roll accurate final adjustment can be made during running of the rolls, or the rolls quickly disconnected from grindin cooperation. Rolls can be quickly removed and other rolls substituted. If it is desired to remove a set of rolls the upper gear housing 100 for the gears 97 and 98 is first-removed, then the rods 90 and 91 are unscrewed and the screws 66 and 67 removed. The yoke frames of the two rolls are then free to be swung upwardly into position indicated in Fig. 5. The bearing frames within the yokes are then opened and the rolls can be withdrawn, and a new set of rolls of different surface for different grinding conditions may be inserted. The rolls vention.

being all of the same diameter, it will be frames within the yokes, and the yokes are merely swung down and fastened and the lever 105 then operated for a final adjustment, if necessary.

I do not, of course, desire'to be limited to the exact construction, arrangement and operation shown and described, as changes and modifications are no doubt possible which would still come within the scope of my in- I claim as follows: v

1. In a grinding machine, the combination of a supporting frame, a. bearing yoke, a journal bearing mounted in said yoke, a grinding roll journaled in said bearing, a rotative shaft mounted in said frame, and having an eccentric bearing on which one end of said yoke is journaled, an abutment screw extending through the other end of said yoke, and abutting against said frame, and a yieldable member connecting said frame with the end of said yoke adjacent said abutment screw.

2. In a grinding machine, the combination of a housing, supporting frames at the ends of said housing, yoke members, journal bearings adjustably mounted in said yoke members, a grinding roll journaled at its ends in said journal bearings, a shaft journaled in said frame and provided with eccentric bearings, said yokes being journaled at one of their ends on. said eccentric bearings, an adjustableabutment screw at the opposite ends of said yokes, and abutting against said frames, rods connecting said frames with the last mentioned ends of said yoke members, and springs interposed be-- tweensaid frames and rods.

3. In a grinding mill, the combination of a supporting housing, a grinding roll within said housing and journaled thereon, a companion grinding roll within the housing having shaft ends, bearing structures receiving said shaft ends, abutments on said housing, adjustable abutment screws at one end of said bearing structures for engaging said abutments to adjust the gap between the rolls, springs tending to hold said screws against'said abutments, a shaft, eccentric pins on said shaft receiving the upper ends of said bearing structures, and a lever for turnin said shaft whereby to further adiust the gap between the rolls;

In witness whereof, I hereunto subscribe my name this 14th day of January, A. D.,

JULIUS A. GERWEN.

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