US1767591A - Roller mill - Google Patents

Description

June 24, 1930( J. w. KENT 1,767,591

ROLLER MILL Filed May 9, 1929' s sheets-sheet 1 '6 Sheets-Sheet 2 J. W.4 KENT Filed May 9, 1929 Nw. Nm.

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June 24, .1930.

l/ITTORNEY J. W. KENT ROLLER MILL June 24, `1930.

Filed May 9, 1929 3 Sheets-Sheet 3 [NI/ENTOR.

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wv L lwmmn V\w., -l mm\ Patented June 24, 1930 UNITED sTArs JAMES W. KENT., OF BROOKLYN, NTN YQRK ROLLER MILL Application ined May 9,

This invention relates to roller mills of the type adapted for grinding paints, inks, chocolate and like substances and materials. The object of the invention is to provide a roller mill for these purposes embodying,` certain novel features whereby to increase the etli-` ciency of the machine and improve its construction.

One object of the invention is to provide 1o improved means for adjust-ing the rollers and to regulate the pressures between them. Another' object is to provide a live roller mill in which the rollers are arranged in a novel manner. Still another' object is to provide means for f-eeding the material from a hopper by a small take off roller. Other objects of the invention arel to provide an improved delivery apron and visible' means for indicating the pressure between the different rollers.

2o Still other objects and features of the inven'tion will appear from the following specitication read in connection with the accompanying drawings in which Figure 1 is an end view of a roller mill embodying the invention, parts being omitted and other parts being broken away.

Figure' 2 is a front view of the mill with parts omitted and broken away.

Figure 3 is a rear view of the machine with 3o parts omitted.

Figure 4 is a diagrammatic view of the gearing.

In the drawings the reference numeral 5 denotes a hollow housing or framework in which there is mounted a plurality of grinding rollers 6, 7, 8, 9 and 10. The roller 6 is also a feed roller.

The other main grinding rollers are provided with shafts 11, 12, 13 and 11ijournaled in slidably supported bearing boxes 15, 16, 17 and 18. It will be understood that the construction and arrangement of these parts as shown in Figure 1 are duplicated at the other side of the machine.

The roller bearing boxes are kept in place by top bars or braces 19, 19 and front bars or braces 20, 20. The rolls are kept in frictional grinding contact with each other and are adj ustable so as to regulate the pressure between them. The adjustment, however, is regu- Serial No. 381,836.

lated with reference to the third rollerS the bearings 16 of which are clamped in position between the frame and the front bars 20.

The second roll 7 is adjusted with reference to the roll 8 by the following means. The reference numeral 22 denotes spacing blocks which are clamped between the front bars 2() and the frame 5 leaving room for the' bearings 15 to slide in. Springs 23 are interposed between the bearings and the frame.

In front of the roller 15 and at each end there is mounted on the frame a bracket 24 which supports a shaft 25 which engages the bearing 15. rilhe shaft carries a gear 26 in mesh with a pinion 27 on an adjusting shaft 28 which extends parallel with the roll 7. By rotating the shaft 28 the bearings 15 will be adjusted with relation to the third roll 8, the springs 23 providing the necessary yielding resistance to the movement of the bearings 15 in a well known manner.

In order to compensate. for wear or unevenness in the roll 7 and its bearings there is provided a micrometer adjustment at one end thereof comprising a sleeve 30 slidably carried in the block 22.

The shaft 9.5 is threaded through the sleeve, and the latter is finely adjusted in relation to the block by a bolt 31 which is screwed into the block and passes through an extension or head 32 of the sleeve 30.

t will therefore be seen that by turning the bolt 3l, the sleeve, which serves as a nut for the shaft 25, will be adjusted with relation to the bearing 15, hence take up for wear at the one end of the roll 7 so as to keep the latter in true parallelism to the third roller 8. The micrometer adjustment is therefore required at only one end of the rolls as is obvious.

In front of the bracket is mounted a casing 34 which encloses a gear 35 fast on the shaft 25 and in mesh with a wide pinion 3G which operates a pointer 87 over a scale 38. The parts are so arranged that as the pressure of the roll 7 aganst the roll 8 is adjusted, the pointer 37 will be rotated and indicate the pressure on the scale in a well known manner.

The pressure indicating means are located at only one end of the roller as seen'in Figure Q. The gear slides on the pinion 36 as the pressure is adjusted.

The means for adjusting the roll 7 are duplicated above the roll 9 for adjusting the latter also with relation to the roll 8 and the parts are similarly numbered. Springs 39 are interposed between rolls to provide yielding frictional contact between rolls 8 and 9. The bearings 17 slide vertically between the front bars 2O and spacing blocks 40 clamped to the frame by the top bars 19.

Again, as seen in Figure 3, the fifth roll l0 is adjusted towards the roll 9 by still a third unit of adjusting mechanism similar to the one described above and similarly numbered. In this case springs 42 are interposed between the blocks and thc bearings 18. The shaft-'s 25 for adj listing the roll l() pass Y through spacing blocks In all three cases referred to the pressure indicating means ar also provided as shown. The operating shafts Q8 carry suitable handwheels 44.

From the foregoing it will be seen that the pressure between adjacent rolls is adjustable separately and may be observed by the indicating means for each adjustable unit.

To the bearingl boxes l5 at each end of the roll 7 there is bolted a bracket 50, see Figures l and 2. The brackets occupy the spaces between the ends of the roller 7 and the front hars 20, the boxes being wide enough to have the brackets bolted thereto as will be understood.

The brackets extend upward and support in slidable relation smaller hearing boiies 51 in which the feed roll 6 is j ournaled. The feed roll may be adjusted with relation to the roll 7 by screws 52. The brackets 50 support between them the feed hopper 54e which contains the material to be ground. The feed hopper is provided with lugs through which pass screws 56. The latter are screwed into the brackets 59.

By this means, not only is the hopper supported, but it may be adj usted vertically with relation to the rolls 6 and 7. The bottom of the hopper is of course open and the sides 57 of the hopper are cut or shaped at the bot-tom as shown in Figure l at 58 to lit the contours of the two rollers 6 and 7. These two rollers therefore form the bottom of the hopper.

The brackets 50 have slots 59 curved on an arc with the shaft 60 of the roll G as center. Bolts 0l pass through the slots and into bosses in the sides of the hopper. Then it is desired to clean the rolls or for other purposes, the screws 56 are loosened and the hopper swung outward until the bolts Gl reach the outer ends of the slots 59. The bolts 6l are then tightened and maintain the hopper in outward tilted position, the sides of the hopper sliding with their bottom edges on the roll G as will be understood. The reverse movement puts the hopper back into position.

The material in the hopper is carried away hy the roll 6 and around the other rollers in the order named. F rom the last or fifth roller l() the material is taken or scraped as it were by a blade which is carried by a bar GG parallel to the roll lO. rlhe bar 66 is hingec at each end on a pin or stud, 67 which is fast in the adjacent bewaring boa: i8.

The bearing botes 1S have rearwardly and inwardly extending port-ions or wings 68. The lower parts thereof carry the pins 67. The upper parts have lugs 69 through which pass screws 70 which bear against the scraper bar 6G to one side of the pins G7. Hence, when the screws 70 are adjusted, the scraper blade G5 is tilted wi h respect to the roll l0.

The numeral 72 denotes a sui port secured t-o the frame and having a hole 73. A delivery chute or apron 74's extends downward from the scraper. The apron has a` pin 75 which tits into the said hole 73 to support the lower part of the apron. The latter is formed with upstanding sides 7 6, the upper ends of which rest on the bar 36 at each end of the scraper blade as seen in Figure 3.

The delivery apron may therefore be detached very easily by a mere lifting movement to free it from the support 72. rl`he scraper blade has sides 77 inside the deliver y apron. y .Y

rllhe rolls are driven as follows, see Figure A, driving shaft 89 extends through the frame and carries a pinion 8l. rihe latter drives a gear 82 on roll shaft 18. Shaft i3 carries a pinion S3 which drives agear 84 on the roll shaft l2 which also carries a pinion 85. The latter drives a gear 86 on roll shaft ll. On the other end of the machine shaft 'll carries a gear 87 which drives pinion 88 on roll shaft 69. The ratio of the gearing is such that each roll is driven at an increasingly greater speed than the preceding roll.

Ink or other material which is to be ground is poured into the hopper 5d and the greater portion of the material will rest on the roll 7. A small portion of the ink will be carried away by the roller 7, but the greatest portion will be taken olf by the slower moving feed roll 6 and deposited as a film on the roll 7 and then carried around from roll yto roll and finally taken off thc last roll 19 bv the scraper G5. t will be seen that the constructirm provides for four points of grinding action between the live rolls so that wheirtho protV is completed a supertinely ground material is obtained.

rlhe means for adjusting the rolls contribnte to a large degree to the superior grindlng of the product, because each roll inav be adjusted to a very fine degree with respect to the next roll by reason of the fact that the adjustment, while being made with reference to obtain the proper grii'iding` contact, nevertheless is made mechanically ae'ainst the springs backed by fixed member.d

This has been found to be superior to means of adjustment which operate merely between two rolls. In the latter case all iiiaccuracies or irregularities between the rolls are multiplied, whereas in the present instance, if one ioll is inaccurately adjusted, the fault is local for that particular roll. It has also been found to be of great advantage to provide the smaller feed roll 6 instead of a large feed roll which is slower in action. It is of course also an advantage that the pressures between the rolls may at all times be accurately ascertained by looking at the gages 37-38- In order to guard against undue spreading of the material, return guides 90 ai'e pro* vided for conducting surplus material from roll 9 down into the hopper 54. Vheii the rolls are to be cleaned and the hopper is swung forward as described, a guard 91 protects the operator from having his hands caught between the rolls 8 and 9. It is iinportant to guard against accidents at this point because the operator reaches in over the hopper.

The pressure of the scraper against the last roller l() may be accurately adjusted by the screws 70. The apron 74 is easily detached and the scraper bar and scraper removed by lifting tlie bar off the pins 67 thus giving easy access to the rear of the machine.

Rolling mills of the character described herein are usually provided with water cooling devices. These and other usual parts of the machine are not shown. It will further be understood that changes may be made in the construction shown and described without departing from the essence of the invention and I therefore reserve the right to make such changes as fall within the scope of the appended claims.

I claim:

I. A roller mill of the character described comprising in combination a first relatively large grinding roll, a feed roll of materially less diameter mounted above and to one side of the said first roll, a pair of superposed grinding rolls mounted on the opposite side of the first grinding roll, a final grinding roll mounted on the same level as the rippermost of said pair of superposed grinding rolls, the said four grinding rollsbeing all of the same size, means for supporting each of said rolls in frictional grinding contact with the adjacent rolls and means for exerting pressure between each pair of adjacent rolls separate from the pressure on the other rolls.

2. A roller mill of the character described comprising in combination a first relatively large grinding roll, a feed roll of materially less diameter mounted above and to one side of the said first roll, a pair of superposed grindinol rolls mounted on the opposite side of thel Erst grinding roll, a final grinding roll mounted on the saine level as the uppermost of said pair of superposed grinding rolls, the said four grinding rolls being all of the same size, means for supporting each of said rolls in frictional grinding Contact with the adjacentI rolls, means for exerting pressure between each pair of adjacent rolls separate from the pressure on the other rolls and means for regulating and indicating said pressures.

3. A roller mill of the character described comprising in combination a first relatively large grinding roll, a feed roll of materially less diameter mounted above and to one side of the said first roll, a hopper mounted above the said two rolls and having an open bottom through which a portion of the surfaces of said rolls project, the sides of said hopper having their lower edges curved to fit the contours of the rolls, means for adjusting the hopper with relation to the said two.

rolls, other grinding rolls mounted on the other side of said first named grinding roll and means for maintaining all of said rolls iii frictioiial grinding contact with each other.

4. A roller mill of the character described comprising in combination a first relatively large grinding roll, slidably mounted beaiing boxes for supporting said roll, brackets secured to said bearing boxes, smaller bear`l the said grinding rolls, means for supporting said feed roll to move with one of said grinding rolls when the latter is adjusted, means for adjusting said feed roll iiidividually with respect to the said one grinding roll and a hopper fi'oin which said feed rolf is adapted to feed the material to the said one grinding roll.

6. In a roller mill of the character described tlie combination of bearing boxes,

brackets secured thereto, a grinding roll mounted in said bearing boxes, a feed roll mounted in said brackets in contact with said grinding roll, a hopper supported on said brackets, means for adjusting the hopper with respect to the said two rolls, means foi" adjusting the feed roll with respect to the hopper and the grinding roll and means for adjusting the said bearing boxes.

7. In a roller mill of the character described tlie combination of bearing boxes, brackets secured thereto, a grinding roll mounted in said bearing boxes, a feed i'oll mounted in said brackets in contact with said grinding roll, a hopper supported on said brackets, means for adjusting the hopper with respectto the Said two rolls, means for adjusting the feed roll Wit-h respect to the hopper and the grinding 10117 means for adjusting the said bearing boxes and means for swinging said hoppenl away from the said rolls for the purposes set forth.

JAMES W. KENT.

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