US1811549A - Rag grinding machine - Google Patents

Description

June 23, 1931. E. LANGEA 1,811,549

RAG GRINDING MACHINE Filed June 26. 1950 e 1 "L" Lr a4 4%. j" 5 fa 'www l i Patente-drJune 23, Y1,931` 'p i' fi i 1,811,545

F a f'enenanaanem '0F aannam* Appiicti'on. mea 'Juneu 26 '1930, seien JN0.

l quickly rotating drum or svvit 'studded' with sharply pointed v,steel pins, and cooperating vvith a pair ofvrollers by which the rags are fedlinto Athe machine and are supported Vduring the tearing `action.VV Y y Y 'llie'drurnsv ofrag devilsusually consistof a cylindrical inner shell carried by ,spokes and naves on a rotarysha'tt, and of anfouterv coatlconsisting of aoplurality of y hard Wood so-calledlags'detachably mounted 2U by screws. and rings onthecircumferential" surfaceof said shell, the pointed steel `pins* being fastened Within and projecting 'from thesaid lags.

` As a mattergof l v in this eldthe pinssoon lose their 4sharp points and tearing capacity whereby the out-' 1 piity ofthe `machineis-considerably1 reduced,

and the driving powverconsumed is ,highly in i t j creased inasmuch as the rags.v presented tothe drum instead of being readily "openedfup are.

Y gathered and transformed int@ a padV which lets like akbralshoe.v t i Y f improved ragvgrinding niachinethe drumof Which .can be held in. proper Working order and repair at considerably smaller `expense y than it ywas' possible heretofore, inasmuch as less time and smaller. Wages arerequired, for` i replacing Wornvpins by vne'vvvones, and. as the d c the case of totore.- l .v Y .m Y, Y

e Another object of the invention isto thus design the drum (about 20%) more) at its `ci rcumference when fearknwriiw vacationers The object @fuit invertida is werden@ an f o cost of spare parts requiredor leep-ingthe improved'machines in; repair isjlower than-jin rag .grinding machines used here-i A points; in' practice theoperator ofthe plantr must @ber putfup Withthe drawback which i of the i1nproved'rag;grinding machine that it :can befstudded with a considerably .larger number of. steel `pins i compared Withjmachineshaving Wooden attached to `4their drum, and that the elliciency 463,5384, aiidin- -eeniay inerti; en 19301 y cordingly.

The invention als ha the output ffent mme i5 insect.'saiaia-- y am@ aepfoviaing proved feed `and lrag rsupportingrollers for rag grinding machines, cooperating Withthfe rotary drum by `wvhich the ever threatening danger Ais eliminated y resulting troni fthe .tendency of. the opened upc-highly inflammable materialf to catch lre'lifr'om sparks `proj-V duced through'accidentail :frictional contact Voi steel :pins vyith the feed Vand supporting rollersof steel as used heretofore.

Farther: ,bife aim@ t. mid" advantages t I obtained by the invention -vvilllbeincidentally eppefethrfiftr?1 f e The nature and sco ejotth'is inventionf'are briefly outlinedl .in the appended-V claiinsand Will morel fully understood from the `atollowing specification taken together with the @CCO-Iipllyiileidrewingsin .which Figs. l andl 2 are side elevations inl full scale showing my improved fsteel pins integrally associated withreaoh' other 'in Ythe -form of" toothed llo-lades and "beingl adapted :to be arid fifi Special materiali detachably ii'xed'in holders `otspecialdesig/n i Fig` is-aperspective viewV of the' bladeholdersrshowingalso the keys `for lock-` ing the toothed blades in 'their Workingqgo-` sition, Y

Figl` f4 is a hlrs;

Vorethe lpinsl'ocated in other sections towards bothffendsp the drum havelost their sharp consists therein that =a` large proportion of planV of one :ofthe Fgc 5 is a cross section throiighthe` andragijsupporting rollers reducedecale,` t illustrating their Cooperationwiththe grind-" the-output of the V-I'nachine vis reduced, j while its .driving power Frequ-ired i is i increa'sede-o'r he mustj'have replaced; the Whole number `of Wooden lags in 'which the steel pins. are fas-` tened by new ones, which means high eX- penses and interruption of the work for a considerable length of time.

I have overcome the said drawbacks by providing small sets or units of pins integrally associated with each other in the form of toothed blades 10, stamped of sheet metal such as steel, phosphor bronze, etc., and which are thus designed that each blade can be singly iiXed on and detached from the rotary drum without dismounting the latter or the blade holders. V i

As seen in Figs. 144 the toothed blades 10 are formed 'with holes 11, 11 of dove-tail shape and are adapted to be inserted into narrow slots 21 of holders 2O and to be locked within the latter by keys 22 sliding in keyways 23 of the holders 20.

The blade holders 2O are attached in juxtaposition to each other to the circumference of the rotary drum and may be secured by any suitable means-e. g, by screw bolts 24, 24'; it should be noted that none of the holders needs to be detached while any of the blades 10 are exchanged-because the latter are inserted in radial direction relatively to the drum and can be'detached simply by partly withdrawing their keys 22.

My experiments have shown that wooden lags-as used heretofore, even if made of the hardest and toughest kind of wood, will not withstand the mechanical strain resulting from the frictional contact between the toothed blades and the rags and the centrifugal forces implied to the toothed blades through the quick rotation of the grinding drum.

In order to carry my invention into eiect in practice I provide blade holders made of aluminum alloyed with reinforcing metals such as copper, magnesium,-etc., known in the trade e. g. as duralumin, electron, Monelmetal which are at the same time strong as to their mechanical strength and light in weight.

As a matter of fact only by the application of blade holders of metal which is strong and light in weight toothed blades can be lused as tearing elements which are so closely assembled in juxtaposed position as shown in Figs. 3 and 4.

It should be noted that there is substantially no space left free between the pins at the seam lines where any two of the holding plates touch each other-or in other words there are no boarder sections free of pins as in the case of wooden lags in which no pins cnbe inserted close to their longitudinal e ges. j

The specific number of pins or teeth per square foot presented by my improved rag grinding drum and correspondingly the output of the machine is therefore considerablyabout 20%-higher than in the case of machines having wooden lags as pin holders.

Another important feature of this invention is the provision of feed and rag supporting rollers of special design. In contradistinction to solid steel rollers used heretofore my improved rollers are provided with a coat of indiarubber, or like elastic material.

In the embodiment of my invention shown in Fig.' 5 the feed and rag supporting rollers concerned consist of steel cores 30, 40 having an intermediate layer of hard indiarubber 31,

`41, firmly attached by vulcanization, and a coat 32, 42 of a softer kind of indiarubber which should be rather tough and hard enough to Well withstand the wear to which it is subjected.

The indiarubber coats 32, 42 are preferably corrugated at their working faces, i. e. provided with longitudinally extending grooves and ridges as in the case of solid steel rollers.

My experiments have shown that no sparks are produced by accidental frictional contact of the grinding drum with my improved feed and rag supporting rollers, and that the danger of the opened up highly inflammable material catching iire from sparks or causing real explosions is eliminated.

Various changes and modification may be made in the construction of the improved rag grinding machines described without substantially departing from the spirit and the salient ideas of my invention. d

E. g. the slots 21 provided in the blade holders 20 may be arranged to advantage at a small angle to their equatorial line of symmetry fr as seen in Fig.

The keys 22 may be made in two pieces to be inserted from both ends of the blade holders 20.

.ICO

Means may be provided for locking the keys 22 `in their working position; my eX- periments however have shown that eXtra locking means for this purpose can be dispensed with and that the keys are in fact self locking, showing no tendency to become displaced even through heavy shocks and vibrations to which the grinding drum is occasionally subjected through rags containing hard aiticles such as buttons, buckles, hooks and the li ze.

In case of accidents caused by hard articles and resulting in bending or breaking off a number of teeth of the blades only the damaged blades-no others-need to be eX- changed, a manipulation which can be easily and quickly performed in the manner described.

The teeth of the blades may be formed to advantage with rounded corners 10a at their lower portion as indicated in Figs. 1 and 2.-I have found that the mechanical strength of the teeth against bending and breaking is j thus better preserved and is higher than in being made of an aluminium alloy the blade holders may be made integrallyvin one piece With the drum and the latter-#includin the i blade holding elementsf-may be made o any suitablematerial which is light in Weight and has a high factor of strength.

WhatIclaimis: l. In a rag grinding machine of the type described, i. e. having a rotarygrinding drum studded With sharply pointedk pins and beingcooperatively associated With rag feeding and supporting rollers, ya drum presenting at its cylindrical'surfaceslots which eX@ tend substantially parallel to the direction of the equatorial .line of symmetry of the drum and transverse grooves, which extend substantially parallel to the axis of the drum, Y toothed blades having holes provided therein and being adapted to be'inserted into the said. slots in radial direction relatively to the drum, keys adapted to be inserted into the said transverse grooves (key Ways) ,so as to detachf y ably secure the toothed blades in their vvork-V ing position at the drum, and rag feeding andv supporting rollers having aninner core of metal and an Vouter coat of non-metallic elastic material. Y

2. A rag grinding machine having the features outlined in claim l, in Which the toothed 3o blades are provided With dove-tail shaped holes corresponding as to their size, form and position to the keyvvays and keys concerned of dove-tail shaped cross section.

3.x Rag grinding machine having the features outlined in claim l, in Which'the blade holding elements of the rotary drum are made of an aluminium alloy.

4. Rag grinding machine having the feav tures outlined in claim l, in Which the slots l o for the reception vof theV toothed blades are arranged at Aa small angle to the equatorial line of symmetry of therdrum.-

5. Rag grinding machine having thev features outlined in claiml, in Which the toothed blades are formed With rounded corners at .v the loWer part of the teeth.,V Y

6. Rag grinding machine having the fea? tures outlined in claim l, in which therag y feeding and supporting rollers are provided With an intermediate layer of hard indiarubber arranged between the inner core of steel and the outer coat of non metallic elastic material.

In testimony whereof I have signed my name to this specification. Y

' EDUARD LANGER;

Images