US2977728A - Paste supplying apparatus for grinding machines and the like - Google Patents

Description

April 4, 1961 W. WROBBEL Filed Oct. 27, 1958 2 Sheets-Sheet 1 Warner wrabbe/ BY MN/ fmi Attarng.

April 4, 1961 w. wRoBBEL 2,977,728

I PASTE SUPPLYING APPARATUS FOR GRINDING MACHINES AND THE LIKE Filed Oct. 27. 1958 2 Sheets-Sheet 2 PASTE SUPPLYING APPARATUS FOR GRINDING MACHINES AND THE LIKE Werner Wrohbel, Nurtingen, Wurttemberg, Germany, as-

signor to Metabowerk Closs, Rauch & Schnizler K.G., Nurtingen, Wurttemberg, Germany f The present invention relates to grinding and/or polishing'machines in general, and more particularly to an improvedV apparatus for applying a paste-like substance:

to the periphery of rotating discoid or cylindrical elements which form part of, and are driven by, auchl machines.

The customary procedure of supplying ak grinding or v polishing paste tothe disks or brushes of grinding or Apolishing machines is to apply the paste by hand. vSuch procedure is rather time-consuming and quite uneconornical because the pasteY is applied in an uneven'layer. It has been observed that the time spent and quantities of paste `utilized by different Workmen operating withidentical brushes or disks are Widely diierent. Therefore, theapplication of paste ,by hand does not meetthe present-day requirements.4 c j `Attempts Were already made to construct apparatus operated by compressed airjfor automatically feeding a paste-like substance tothe rotating discoid elementspof such machines. The disadvantage of apparatus ofnfthis type is in that compressed air is seldom available in locations where the grinding or polishing machines are utilized. In addition, the compressed air escaping-from such apparatus generates air currents whirling up `the` dust and dirt which are'always present in locations Where a grinding or polishing `machine is operated. This is particularly undesirable when a polishingoperationis performed. c

rIfo avoid the just enumerated drawbacks of paste applicators operating With compressed air, such apparatus are often equipped with an electric or-like motor and with suitable reducing gearing to feed the paste at 'a desired rate against the periphery ofl a revolving discoid or cylin- 2,977,728 ifatented`Apr. 4, 19,61

time.

An important object of the"present inventionfis to provide an apparatus for applying paste sticks to the kperiphery of a` rotating discoid `or lcylindrical element which operates in such manner that the paste sticks may be applied continuously without interruption in operation kof the machine of which the rotating 'element forms a component part. f 1

Another object of the invention'is to provide an 'apparatus of the above described characteristics which is capable of applying paste sticks of diiierent dimensions.

A further object of the invention is to provide. an apparatus as above set forth'which operates with'out a motor or compressed air, and inwhich the rate at which the' paste stick is fed against the periphery of a discoid or cylindrical elementmay be adjusted within a desired range. ,Alstill further object .of the invention is to provide an apparatus for applying paste to rotating discoid and/ or cylindrical elements of polishing machines andthe like .which is adjustable `in the radial and axial direction of the rotating element.

A yet `further objectl of the invention is to provide an apparatus as above set forthwhich is so constructed and which operates in such manner thateach paste stick is fullyV consumed before thenext one comes into Contact with the rotating member.

An additional object of the invention is to provide an assembly as above described which is capable of guiding elongated, short or broken paste sticks into contact with the rotating discoid or cylindrical element.

A concomitant object of the invention is to provide an apparatus for applying paste to rotating elementsV of grinding and/or polishingmachines which is so c'onstructed that the `rate'at which the paste is fed may be controlled andychangedv not only before and' after but also during the operation of such machines. l

A yet further object of the instant invention is-to provide an apparatus as above set foithiwhich is fully automatic and requires no `attention when the grinding'oi' polishing machine is inv actual use.

drical element. `In addition-'to 'the factf that 'apparatus utilizing electric motors andrelatively complicatedlgearing jarejrather expensive, they require constant attention `and repair, and are ftoo sensitivepforuse under the con`- ditions attendant to the utilization of` grinding and polishing machines.

Anadditionaldravvback of knovvn apparatus for` applying paste to. grinding `disks Vand the likegisV virl-that4 such devices 'utilizea pivoting `bracketfor YstrapV whiclrappliesI isrelativelyv hard andfbrittle, jandThen'ce more likely V,to

A yet further object of the invention'is` tolprovideV an apparatus for applying paste-sticksto grinding disks and -thellke 4which isfso constructed that each 'major surface of. the stick is 'positively guided duringits advancejto- 'pressure tofthe paste, the latter being customarilyin theiif tformgofa stick or bar..V Such strap necessarilyf` bears onlyy against a singlev surfacedj ofthe 1stick, thusk creatingVA the` danger of breaking a pasteV stick especially if ^the latter breakhvvhen subjected to one-sided pressures.; `Stillf `further, a pivoting bracket` or strap" placed? about af .pasteV stick is` capable'of engaging only a singlefstick 'andaftefr reaching its extremerpos'itio'n, must be returned into its A original positionvvhena paste stick'is. consumed to the extent permitted in"A such zfrnachinesf'y Thebracket clearly "f f cannot cause `applicationandv consumptionof the" entire stick so that relatively large Vvdiscards. areleft overLfrom each paste sticky .Such discardseorremnant's' mustfbe Wardthe disk. v f t j.

The above and certain other objects ofthe invention are attained by thefprovision ofY an apparatusV Vvvhich comprises :essentially a housing deiining av passage lsubstantially radially disposedwith respectfto the periphery of arrotating` discoid element whic'hflatter forms a" coni- .ponent part and lis driven bythe motor! of the grinding .or polishing machine, and vmeans `for advancing the paste sticks'received 1n such housing toward and intocontact with the yperiphery'-of., the-rotatingelement-*The means for advancing pastesticks comprises'at'leastonebut preferablyY more driven endless. chains whose g length is sfo chosenfthat the nextrpaste "stick isf-positively engaged beforethe preceding-one" is fully consumedfwhereby the next paste st ick,whi1e advancing'tovvard fthe4V periphery ofl arotatin'gj'disk, cylinder or brush-'actually urges the preceding sticktowardfandrintojcontact Withthe peripht ery'offtherotating l element even' though the remaining l portion of the preceding stioktisfaleady released by the Y advancing means; t In i addition, su'clr an' "arrangement of continuously;advancing: 'series of 'sticks disposedfendito end even causes a broken stick to advance in the Same manner as the unbroken ones.

The novel features which are considered as characteristic for the invention yare set forth in particular in the ap`- -prended claims. The invention itself, however, both as to its construction and its method of operation, together with additionalobjects and advantages thereof, will be best understood from the following description of a specific embodiment when read in connection with the accompanying drawings, in which:

Fig. l is partly elevational and partly sectional view of the improved apparatus shown attached to the protecting shield ofa grinding or polishing disk, the section being taken on line I--I of Fig. 2 as seen in'the direction of arrows;

Fig. 2 is top plan View of the structure shown in Fig. 1; and l Figs. 3 `and 4 are detail sectional views taken, respectively, on lines III--III and IV-IV of Fig. 2.

Referring now in greater detail to Figs. 1 and 2, the improved paste applicator therein shown is mounted on `a support 3 which is fixed to, or integral with, the protecting shield 2 of a grinding or polishing disk or brush 1. The shield 2 is formed with a cutout or aperture 5 through which a grinding or polishing paste stick 4 is led toward and into contact with the periphery 26 of the disk. Support 3 carries or is integral with a pair of spaced guide rails 7 parallel with the axis of drive shaft 6 which latter mounts the grinding or polishing element 1. Each of rails 7 has connected thereto a band or strip 8 at its side facing the elongated rodor strip-shaped paste 4, the members 8 abutting against the 4adjacent end surfaces .of rollers or runners 9 mounted on an angular carrier 12 for travel along rails 7 between the axial ends of disk l, the directions in which the carrier 12 travels being indicated by double arrow 11. Carrier 12 has a horizontal leg or extension 13a rotatably supporting the lower end of a threaded spindle 14, and may be fixed in a desired position by meansof a retaining element 15, such as a set screw, which is held in support 3 and is adapted t0 bear against the vertical leg 13b of the carrier to releasably connect the latter with support 3. Screw 15 exerts a horizontal clamping force against leg 13b and, when drawn tight,'prevents rollers 9 from traveling along the icflzill 17 and strips or bands 8 in the axial direction of 'germes ferent thicknesses. Housing section 29a is connected with the stationary section 29b by means of spaced spindles 32. The latter are rigidly mounted in section 2911 and extend through suitable apertures in section 29a so as to be outwardly adjacent to a U-shaped guide mem ber 31 which guides a pair of opposed surfaces of paste strip 4 passing between chains 21, 22 toward the periphery 26 of disk 1. Each spindle has a threaded end portion receiving an adjusting nut 34. Resilient elements 33,'here shown las coil springs, surround the spindles 32 and Iact between the housing section 29a and nuts 34. Thus, the four major or side surfaces of a generally rectangular paste stick are engaged and guided by member 31 and by the Stringers 23, 24 of respective chains 21, 22 within the radial passage defined by housing 17.

Housing section 29b is formed with la horizontal ledge or extension 29h receiving an internally threaded member 29b whose threads mesh with the external threads on spindle 14. ln this manner, when the spindle 14 is rotated by an operator who turns the transverse handgrip member 14a, housing 17 is caused to move toward `or away from the periphery 26 depending upon in which direction the spindle rotates. The latter is rotatable in leg 13a without being axially movable therein. Thus, the novel apparatus comprises means consisting of support 3, rails 7, bars 8 and rollers 9 for guiding the carrier 12 and hence the housing 17 in axial directions of the disk 1, as well as means consisting of spindle 14, ledge 2911', member 29h" and guides 1S, 19 formoving and leading the housing 17 with respect to carrier 12 radially toward and away from the periphery 26 while remaining supported by the stationary carrier 12. In addition, by consisting of two relatively movable sections 29a, 29h, composite housing 17 may accommodate paste sticks of different thicknesses a due to the provision of adjusting means 32-34, springs 33 at the same time causing Stringers 24 of chain pair 22 to bear against the adjacent surface of la paste stick or sticks with a force suflicient to prevent sliding movements of the sticks when the driven chain pair 21 is idle.

Referring now to Figs. 3 and 4, means for advancing the driven chains 21 therein shown comprises an electrical lifting magnet or solenoid 35 having a slidable armature 36. The lower end of armature 36 which projects beyond the solenoid 35 carries a pivot pin 37 on which is Y Vfulcrumed an actuating bar 38. The latter carries a pin 39,

Carrier 12 supports a special housing or frame 17 for the paste sticks which is Vadjustable in radial directions of the disk 1. As best shown in Fig. 2, housing or frame 17 is guided by a radial rail 19 which is fixed to carrier 12 and controls a radial rail lfxed to the assembly 17.

Housing 17l supports two pairs of endless chains 21 and 22.l Stringers 23 of chains 21 and Stringers 24 of chains 22 lare adjacent to and parallelwith each other, their distance a being adjustable and so selected that it corresponds to the thickness, i.e. tothe distance between ,theV opposingsurfaces, of a preferably rectangular paste st r1p4. f At least one of chains 21,122 is driven in the direction of arrows 16`bya mechanism to be described in greater detail hereinafter, the other chains merely travel? ing with the driven chains'or chains dueto the engagement of chain links 25 with" the paste'strip i4.' Infthe Aillustrated embodiment, chains 21.V are driven by a solenoid 35 while the chains`22 Vmerelyl follow the movement of chains 21 when a pastestick 4 is introduced between Stringers 23, 24. r v Stringers 23, 24 of respective Vchain pairs 7.1, 22 are prevented from yielding to the relatively solid `paste sticks yby abutting against and by being guided along vertical supporting elements or holding rails 28 which are Vfixed to housing 17 by means of bolts 27.

j. As may be seen in Fig. 2,'the housing 17 comprises two portions or sectionsf29a, 29`b, the section 29a being. movable with respect to the stationary sectioni29b. In this manner, the housing mayaccorumodate paste sticks" ofdifparallel with member 37, which is received in an elongated closed slot 41 provided in-a lever 43 swingable in the directions of arrow 42. Lever 43 is connected with the cage or housing 44 of a rolleror freewheel-clutch 45 which drives the 'shaft46V rigidly mounting the sprockets 47 (see Fig. l) of driven chains 21. When reciprocated, actuating lever 43 causes intermittent angular movements of clutch 45 land thus advances. Stringers 23 of driven chains 21 in the direction of arrows 16. The extent of swinging or oscillatory movement of lever 43 is deter- `mined by an adjusting or setscrew 48 whose end 49 abuts against a lstop plate 51 fixed to the portion 29b of housing17. In this manner, screw 48 also controls the rate at which the paste sticks advance toward the periphery 26 of grinding or polishing diskV 1. ,Plate 51 also support.- the lower end 52 of a tension spring 53 whose other end 54 is connected with pivot pin 37 to constantly urge the lever 43 intosuch extreme position in which the end 49 ofadjustingmember 48 abuts against the stop 5l .and the Y armature 3.6`iswithdrawn from solenoid 35. The oscil- Vlatoryn'iovement in opposing direction is performed by lever,43` under the influenceU of armature 36 .vhen the solenoid 35 mounted on housing section 29b is energized.

The improved paste applying apparatus operates in the following manner: l

A'f5 off'the two directions indicated byfarrow 11 alongfrails'7 of support 3, i;e. in a direction parallel with the axis of shaft 6, whereupon the member is again drawn tight to maintain the assembly 12, 17 in such selected axial position. If necessary, spindle 14 is turned in clockwise or anticlockwise direction to move the housing 17 radially toward (see arrow 16) or away from the periphery 26. Y It will be noted in Fig. 1 that the housing 17 carries a tubular chute or receptacle 55 which contains at least one but preferably more paste sticks 4 in addition to the paste stick 4 already received in the radial passage of housing 17, i.e. withinl guide member 31 and between the stringers 23, 24 of respective chain pairs 21, 2,2. Paste stick 4 is first to, come into actual contact with periphery 26. Upon entry of paste stickp4 between stringers 23, 24, nuts 34 are turned in a direction to compress the coil Vsprings 33 on spindles 31 to the extent suflicient to cause satisfactory engagement of said stringers with the adjacent sides of the stick in that the chain links 25` may actually enter to a certain extent into the material of member 4 and insure jits advance toward the periphery 26 when at least one set of chains, i.e. chains 21, is driven.k

When the electric circuit (not shown) of electromagnet 35 is completed, the latter retractsits armature 36 in upward direction and, over the above-described linkage, causes the lever 43 to turn the clutch 45 in such direction as to cause, over shaft 46 and sprockets 47, av corresponding advance of driven chains 21 in the direction of arrows 16. Such advanceof chains 21 Acauses a corresponding movement of paste stick 4 toward the periphery 26 so that the rotating disk 1 receives a certain amount of paste determined by -the frequency of oscillations performed by lever 43 and by the momentary setting of screw 48 which latter, as above described, controls and determines the rate at which thevpaste stick l4 advances'after eachretraction of armature 36 into the energized solenoid 35. The other pair of chains 22 merely acts as an abutment for the advancing paste stick 4 andperfor'ms intermittent movements similar to those of driven chains 21 without requiring a positive driving connection. It will be understood that the idle or follower chains 22 may be replaced by a solid wall or like guide means along which the paste sticks slide when advanced by the driven chains 21. Y v p When the circuit of solenoid 35 is open resilient member 53 immediately withdraws armature 36 in downward direction until the end 49 of member 48 abuts against the stop plate 51, such movements of armature 36 `,and hence of lever 43 causing no return movements of stringers 23 in the direction' opposed to` that of arrows 16 due tothe well-known characteristics of clutch 45 which latter transmits `rotary motion inone direction only.

Whenthe lowerinost pastestik 4 is partly consumed,V the end-to-'end disposedv stick 4' follows imrnediatelybyv sliding in the enclosure. within tubular member 55 toward and into the passage in housing 1 7; thus, stick 4 is also polishing jdisk lineed` not be interrupted even if the machinepofvwhichl element 1 forms` part is put to extended and `uninterrupted use. -VIt will,b e noted that the length automatic make-and-break system may be utilized when the grinding or polishing machine of which-the disk 1 forms partis put to use for relatively long periods of time. It will be understood that the disk 1 may be replaced by a cylinder or a brush without requiring changes in the construction of the paste applying apparatus. v n

Without further analysis, the v.foregoing will so fully reveal the gist of the present invention that others Vcan by applying current knowledge readily` adapt it for various applications without omitting features that, from the Standpoint of prior art, fairly constitute essential characteristics of the generic and specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

I claim: i 1. An apparatus 4for applying paste sticks to the periphery of a rotating element in grinding machines and the like which comprises, in combination: a yhousing deiining a passage substantially radially disposed with respect to said periphery for receiving paste sticks in end-to-end relationship; and advancing means supported by said housing for consecutively engaging and moving the paste sticks toward said periphery, said advancing means comprising at least one endless chain having a Stringer in contact with at least one paste stick in said passage, and means for so driving the chain that saidl stringer entrains each paste stick in contact therewith toward said periphery.

2. An apparatus for applying paste sticks to the peripheryof a rotating element in grinding machines and the like which comprises, in combination: a housing including a guide member defining a passage substantially radiallydisposed with respect to said periphery for receiving paste sticks in end-to-end relationship;V and advancing 3.,'An apparatus for applying paste sticks to the periphery of ya rotating element in grinding machines and the like whichcomprises, in combination: a housing defining a passage substantially radially disposed with respect to said periphery for receiving paste sticks in end-to-end relationship; and advancing means supported by said housing for consecutively engaging and vmoving the paste sticks toward said periphery, said advancing means comprising at least one endless chain having a Stringer in contact with at leastone paste stick in said passage, supporting means for holding the Stringer-in contactV with'the paste stick, and means for so driving the chain that i. said Stringer entrains each paste stick in contact therewith of chains 2d, 22 isso selected asto atleast approximate theleng'th of a vpaste stick 4 or 4whe"reby ,the next-followi ing stick 4 is `engaged and positively entrained ,after very small reductionin theleng'th of lowermost member 4. In

addition, even smallfremnantsof stick 4, will be con'ipletely consumed because the now positively, engaged andidownf 4,vgardlyl'advancing paste stick4r presses the remaining por- *tion of .Y preceding stick f4 towardthe periphery 26 even after vthe remaining portion of member v 4 Iis so small that 170Y it'sno lpnger engaged by thestringersnZS andfZ/t-.sl a .Completing and opening-of thecircuit'of solenoid 35 maybe performed .automatically by anysuitable meansv j (notfshown) or bythe operatorhimself wheneverthe apj plicationtof paste to periphery2 6 bfecnmes necessary. `An

toward said L periphery. t 4. An apparatus lfor vapplying paste sticks to the periphf eryvof a rotatingelement in grinding machines and the like which comprises,` in combination: a housing defining a passage substantially radially disposed with respectto said periphery for receiving elongated paste sticks vrtof uniform length inVend-to-end relationship; andadvancing means supported by said housing and including a plurality of endless chains having stringers in contact with at least one paste stick in said passage and of a length-correspond ing substantially f to the length of vai paste stick, and

means for drivingat least oneofsaidchains in such manner that its Stringer advances each p aste stick incontact therewith toward said fperiphery. t

5,. An apparatus forapplying pasteisticks `to the periph,- ery ofv a rotating element in grindingmachinesand the likewhich comprises, in combination: a housing dening i' a passagesnb'stantially radially disposedwith respect, to said peripheryfor receiving atleast one elongated` paste stick; a tubular member connected with said housingand defrtipgtanfemlgsure in Continuation Of saidrassaeafo receiving paste sticks in end-to-end relationship, one of the paste sticks in said enclosureabutting against the paste stick in said passage; and advancing means supported by said housing and including at least one endless chain having a Stringer adjacent to said passage and in contact with the paste stick therein,V and means for driving said chain in such manner that the stringeradvances each paste stick in contact therewith toward said periphery.

6. An apparatus for applying paste sticks to the periphery of a rotating element in grinding machines and Ythe like which comprises, in combination: a housing defining a passage substantially radially disposed with respect to said periphery for receiving at least` oneelongated paste stick; a tubular memberrconnected Vwith said housing and defining an enclosure in continuation of said passage for receiving paste sticks in end-to-end relationship, one of the paste sticks in said enclosure abutting against the paste stick in said passage; and advancing means supported by Said housing and including a plurality of endless chains each having a stringer adjacent to said passage and in Contact with the paste stick therein, and means for driving at least one of said chains in such manner that its Stringer advances each ypaste stick in contact therewith toward said periphery.

7. An apparatus for applying paste sticks to the periphery of a rotating element in grinding machines and the like which comprises, in combination: a housing including a pair of sections one of which is movable toward and away from the other section, said sections defining therebetween a'variable passage disposed substantially radially with respect to said periphery and receiving at least one paste stick therein; means for moving said one section toward and away from said other section; and advancing means supported by said housing and comprising yat least one driven chain having la Stringer adjacent to said passage and engaging with at least one paste stick therein, and drive means operatively connected with said chainfor moving the Stringer in such direction that each paste stick engaged thereby is fed toward and into contact with said periphery.

8. An apparatus for applying paste sticks to the periphery of a rotating element in grinding machines and the like which comprises, in combination: a housing including a pair of sections one of which is movable toward and away from the other section, said sections defining therebetween a variable passage disposed substantially radially with respect to said periphery and receiving at least one paste Astick therein; means for moving said one section toward and away from said other section; resilient means for constantly urging said one section toward said other section; and advancing means supported by said housing and comprising at least one driven chain having a Stringer adjacent to said passage and engaging with at least one paste stick therein, and drive means operativelyV connected with said chain `for moving the Stringer' in such direction that each paste stick engaged thereby is fed toward and into contact with said periphery. Y f

9. An apparatus for applying paste sticks to the periphery of a rotating element in grinding machines and the like which comprises,V in combination: a housing including a pair of sections one of which is movable toward and away from the other section, said sections defining therebetween a` variableA passage disposed substantially radially with respect to said periphery and receiving at least one paste stick therein; a tubular member connected with said housing and defining an enclosure aligned with said passage, said enclosurereceiving a plurality of paste sticks in end-to-end relationship, one of the paste sticks in 'said enclosurelabutting against the paste stick in said passage; means for moving said one section toward and away from said other section; and advancing means supported by said housinganl comprising at least one Adriven chain havinga Stringer adjacent to said passage and engagingfwith at lastf`-onepast stick therein, and'dr'ive means,v operatively connected with said chain for moving the Stringer in, such direction that each paste stick engaged thereby isfed toward and into contact with said periphery.

Y Y,10. An apparatus for applying paste sticks to the periphery of a rotating element in grinding machines and theV like which comprises, in combination: a housing including a pair of sections one of which is movable toward Vand away from the other section, said sections defining therebetween a variable passage disposed substantially radially with respect to said periphery and adapted to receive at least one paste stick therein; means for moving said one section toward and away from said other section; resilient, means for constantly .urgingV said one section toward -said other section; and advancing means comprising at least one chain supported by each of said sections, each of said chains raving a Stringer adjacent to and in contactvwith at least one paste stick in said passage, and drive means operatively connected with at least one of said chains for moving same in such direction that the respective stringer advances each paste stick in Contact therewith toward said periphery.

1l. An apparatus for applying paste sticks to the periphery of a rotating element in grinding machines and the like which comprises, in combination: a housing including a pair of sections one of which is movable vtoward and away from the other section, said sections defining therebetween a variable passage disposed substantially radially with respect to said periphery and adapted to receive at least one paste stick therein; means for moving said one section toward and away from said other section; resilient means for constantly urging said one section toward said other section; and

Vadvancing means comprising a pair of endless chains supported by each of said sections, each of said chains having a Stringer adjacent to and in contact with at least one paste stick in said passage, and drive means operatively connected with one pair of said chains for moving same in such direction that the respective stringers advance each paste stick in contact therewith toward said periphery, whereby the stringers of the other pair of said chains are caused by the paste stickin contact therewith to follow the movements of the stringers of said one pair of chains.

12. An apparatus forv applying paste sticks to the periphery of a rotating element in grinding machines and the like which comprises, in combination: a housing connected with said machine and including a pair of sections one of which is stationary and the other of which is movableY toward and away from said stationary section, said sections defining 'therebetween a variable vertical passage ,disposed substantially radially with respect to Asaid element and adapted to receive at least one paste stick therein; means for moving said other section with respect to said Vone sectiong'resilient means forconstantly urgingsaidrother section toward said one section; a first pair of endless chains supported by said one section and a second pair of endless chains supported by said other section, each of saidV chains having a stringer adjacent to and in contact with at least one paste stick in said passage; and means operatively connected' with said ,first pair of'chains for moving same in such direction that theirrstringers advanceeachV paste stick in contact therewith toward said periphery, whereby the stringers of said second 'pair Vof chains are caused by the paste stick in contact therewith to follow the movements of the stringers of said first pair of chains.

1,3. An apparatus for applying paste sticks tothe periphery of a rotating element in grinding machines and the like .which comprises, in combination: a housing connected withv said machine and including a pair of sections one of which is stationary and the other of which is movable Vtoward and away from said stationary section, said vsections defining'thereb'etweenfa rvariable vertical passage disposed.' substantially radially withre.-

9` spect to said element -and adapted to receive atleast one paste stick therein; -a vertical tubulanmember connected to and disposed above said housing, said tubular member defining a vertical enclosure aligned with said passage and adapted to slidably receive therein a plurality of paste sticks in end-to-end relationship whereby the paste sticks in said enclosure descend by gravity toward and into end-to-end contact with the paste sticks in said passage; means for moving said other section with respect to Ysaid one section; resilient means flor constantly urging said other section toward said one section; airst pair of endless chains supported by said one vsection and a'second pair of endless chains supportedV by said other section, each ofsaid chains having a Stringer adjacent to and in contact with atleast one paste stick in said passage; and means operatively connected with said first pair of chains for moving same in such direction that their stringers. advance each paste stick in contact therewith toward said periphery, whereby the stringers of said second pair of chains are caused by the paste stick in contact therewith to follow the movements of the stringers of saidfiirst pair of chains.

14. An apparatus for applying paste sticks to the periphery of 'a rotating element in grinding machines and the like which comprises, in combination: a housing defining `a passage substantially radially disposed with respect tosaid periphery for'receiving at least one elongated paste stick; a tubular member connected'with said housing and defining an enclosure incontinuation of said passage for receiving paste sticks in end-to-end relationship, one of the paste sticks in said enclosure abutting against the paste stick in said passage; and advancing means supported by said housing andV including at least one endless chain having a Stringer adjacent to said passage and in contact with the paste stick therein, and solenoid means for intermittently driving said chain in such manner that the stringer advances eachpaste stick in contact therewith toward said periphery.

15. An apparatus for applying paste sticks to the pe- A e riphery of a rotatingV element in grinding machines and the like which comprises, in combination: a housing defining a passage substantially radially disposed with respect to` said periphery for receiving elongated paste sticks of uniform length in end-to-end relationship; and advancing means supported by said housing and including a` plurality of endless chains having stringers in contact with at least one 4paste stick in said passage and of a length corresponding substantially to the length of a paste stick, and means for driving at least one of said chains in such manner that `its stringer advances each pastestick in contact therewith toward saidrperiphery, said last mentioned means comprising a lifting magnet supported by said hous? ing and having a reciprocable armature, andan operative l0 Y riphery of a rotating element in grinding' machines and the like which comprises, in combination: a housing defining a passage substantially radially disposed with respect to said periphery for receiving at least one paste stick therein; and advancing means including at least one endless chain having a stringer adjacent to and in contact with at least one paste stick in said passage, sprocket means for rotating saidtchain, shaft means supported by said housing and connected with said sprocket means, magnetic means fixed to said housing including an armature retractableinto and adapted to be withdrawn from said magnetic means, a linkage for connecting said armature with said shaft means, the linkage rotating said shaft means and said sprocket means for driving said chain in a direction to move each paste stick in contact therewith toward said periphery when said armature is retracted into said magnetic means, and roller clutch means connected with said linkage and with said shaft means for permitting movements of said linkage without rotating said shaft means when the armature is withdrawn from said magnetic means.

18. An :apparatus for applying paste sticks to the periphery of a rotating element in grinding machines and the like which comprises, in combination: a housing including a stationary section fixed to said machine and a movable section displaceable toward and away from said stationary section, said sections defining therebetween'a passage disposed substantially radially with respect to said periphery and'adapted to receive at least one paste stick therein; at least one endless chain supported by said stationary section and having a stringer adjacent to and in contact with at least one paste stick in said passage; sprocket means for said chain; shaft means carried by said stationary section for mounting said sprocket means; a solenoid supported by said stationary section and including an armature retractable into said solenoid when the latter is energized; resilient means for constantly urging said armature into a position in which it is withdrawn from said solenoid; a roller clutch connected with said shaft means and withsaid armature in such manner as to rotate said sprocket means and to move said Stringer in a direction to advance each paste stickin contact thereconnection between said armature and said one chainV for y: v

moving the latter in response to reciprocating movements of said armature. y V

16. An apparatus for applying paste sticksto ,the pe- Y riphery of a rotating element in grinding machines and i the like which comprises, in combination: a housing defining 'a passage substantially radially disposed VWithre- 'spect to said periphery for receiving lat least *one paste stick therein; and advancing means including at least one endless chain having Va Stringer adjacent to landin coni tact with at least one pasteistick in vsaid passage, sprocket meansy for rotating said` chain, shaft. means supported by said housingandconnectedwith said sprocket means,

. magnetic means xed Ato said housing and'including an with toward said periphery when said armature is retracted into said' solenoid; and means for adjusting the extent to which said armature is withdrawn from said solenoid. l

19. An apparatus for applying paste sticks to the periphery of a rotating element in grinding machinesand the` iike which comprises, infcombination: a housing includmg a stationary section fixed to said machine and a movable section displaceable toward and away from said stationary section, said sections delining therebetween a passage disposed substantially radially with respect to said s periphery and adapted to receive at least one paste stick therein; atleast one endless chain' supported by said statlonary section and having a Stringer adjacent to and in contact `with at least one paste stick inl said passage; sprocket means for said chain; shaft means carried by saidv stationary section for-mounting 'said sprocket means; a Solenoid supported by said stationary section and including an armature retractable into said solenoid whenthe armature retractable into and adapted to be withdrawn s i from'said magneticmeans, and a linkage-for'` connecting l said armature with said shaft means, thellinkagerotating said shaft means andsaidsprocket means forjdriving said kchain in a direction to'move eachpaste stick ini"`contactg therewith toward said periphery when said armature is retractedeintov'said magnetic means. I y

17. An apparatus for applying*pastesticksto the pelatter is energized; resilient means `for constantly urging 'said armature into a'position in which it is withdrawn from I said soleno1d;and a roller clutch connected with said shaftY means andwith said4 armature Vin-such manner as to rotate said fsprocket means and to move said stringer in a direction to advance eachpaste stick-in contact therewith toward said periphery whenv said armature is retracted into said solenoid. A

y 20.1For use with a machine of the character described which includes an element rotatable about an axis and having a peripheryfand a protecting shield adjacent to said periphery and definingan aperture, an apparatus for applying paste sticksy to the peripheryof said element s comprising, in combination: a support fixed to said shield adjacent to said aperture; a pair of rails connected with said support and parallel with the axis about Vwhich said element rotates; a carrier; roller means connected with said carrier and mounted for travel along said rails; means for releasably connecting said support with said carrier; a radial rail iixedY to said carrier; a housing supported by said carrier for movements along said radial rail toward and away from said element, said housing defining a passage substantially radially disposed with respect to'said periphery, aligned with said aperture and adapted to receive at least one paste stick therein; means for moving said housing with respect to'said carrier; and means for advancing the paste sticks in said passage to- Ward and through said aperture into contact with said periphery, said last mentioned means comprising at least one endless chain supported by said housing and'v having a Stringer adjacent to and in-contact with atleast one paste stick in said passage, and' means for driving said chain in such direction that the Stringer advances each paste stick in contact therewith toward said periphery.

21. For use with a machine of the character described which includes an element rotatable about an axis and having a periphery, and a protecting shield adjacent to said periphery and defining an aperture, an apparatus for applying paste sticks to the periphery of said element comprising, in combination: a support xed to said shield adjacent to said aperture; a pair of rails connected With said support and parallel with the -aXis about which said element rotates; a carrier; roller means connected with said carrier and mounted for travel along said rails; means for releasably connecting said support with4 said carrier; a radial rail fixed to said carrier; a housing supported by said carrier for movements ,along said radial rail toward and away from said element, said housing dening a passage substantially radially disposed with respect to said periphery, aligned with said aperture and adapted to receive at least one paste stick therein; means for moving said housing with respect to said carrier; and means for advancing the paste sticks in said passage toward and through said aperture into contact with said periphery saidlast Vmentioned means comprising at least one endless chain supported by said housing and having a Stringer` adjacent to and Vin contact with at least one paste `stickein said passage, means for supporting and maintainingrthe Stringer in contact with the Vpaste stick, and means for driving said chain in such direction that the Stringer advances each paste stickl in contact therewith toward said periphery.

ReferencesCited in the tile of this patent UNITED STATES PATENTS Moon Oct. 31, 1939

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