US1733093A

US1733093A - Grinding

Info

Publication number: US1733093A
Application number: US24106A
Authority: US
Inventors: Booth Clement
Original assignee: Cincinnati Grinders Inc
Current assignee: Cincinnati Grinders Inc
Priority date: 1925-04-18
Filing date: 1925-04-18
Publication date: 1929-10-22
Anticipated expiration: 1946-10-22

Description

Oct. 22, 1929. C, B T 1,733,093

- GRIND ING Original il April 1925 5 Sheets-Sheet a Oct 22, 1929 c. BOOTH 1,733,093

GRINDING Original Filed April 1811925 3 Sheets-Sheet 2 C. BOOTH Oct. 22, 1929.

GRINDING Original Filed April 18, 1925 6 Sheets-Sheet Patented Oct. 22, 1929 units!) STATES PATENT' OFFICE CLEMENT BOOTH, 01E CINCINNATI, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO CINCINNATI GRINDERS INCORPORATED, OF CINCINNATL'0HIO, A CORPORATION OF UHIO GRINDING Application filed. April 18, 1925, SerialNo. 24,106. Renewed-July 27, 1929.

This invention relates to grinding and inore particularly to grinding apparatus of the kind described in Reissue Letters Patent No. 15,035'to Lewis R. Heim.

One of the objects of thisinvention is to provide a simple and thoroughly'lpractical mechanism for positioning work pieces'into operative relation to the grinding wheel and regulating wheel of grinding apparatus of the above-mentioned type and for removing work pieces therefrom upon the completion of the grinding operation. Another object is to provide a mechanism of the abovement'ioned character which will be of simple but rugged, construction, of thoroughly-reli able action, and capable of high speed of operation. Another object is to provide a mechanism of the above-mentioned type in which the introduction of work pieces into, and the removal thereof out of operative relation with respect to the two wheelsof the apparatus may take place in repeated sequences but in\such manner that the respective time intervals for the operations of introductionand removal of the work pieces overlap. thereby to minimize loss oftime and toprovide a high rate of grinding production. Another object of this invention is-to provide a grinding apparatus in which work pieces of non=uniforni shape or form, such as y tapered rolls,,for example used in certain types of roller bearings, may be rapidly and efficiently groundto ahigh degree of precision. Another object is to provide a mechanism of the abovementionedcharacter which may be quickly and conveniently applied to a grinding apparatus of the type mentioned here1nabove in order to adapt the latter, in a simple and. thoroughly practical way, for the achievement of such objects as are noted above. Another object isto provide an apparatus and mechanism of the above-mentioned character which will be well adapted to meet the varying conditions of hard practical use. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts as will be exemplified in the structure to be hereinafter described and the scope of the application of whlch will be indicated in the following claims. In the accompanying drawings, in which is shown one of various possible embodiments of the mechanical features of my invention, I

Figure 1 is a rear elevation of the complete grinding apparatus; 1.

- Figure 2 is a vertical sectionalview taken along the line 2-2 of Figurel;

Figure 3 is a horizontal sectional View, taken along the line 33 of Figure 2, showlng the relation of certain parts of the apparatus when the work piece isin operative relation to the two wheels; I

. Flgure 4; is a view similar to that of Figure 3 but shows the relation of certain parts of the apparatus in both work-receiving and work-discharging position;

Figure 5 is a'vertical sectional view talren along the line 5-5 of Figure 4, and

Flgure 6 is an enlarged fragmentary side elevation showing the work carrier and parts coacting therewith, when the workpiece is in operative relation to the two Wheels.

Similar reference characters refer to similar parts throughout the several views of the drawings. I

As conducive to a clearer understanding of my invention, it might atthis point he noted that grinding apparatus of the type disclosed in the above-mentioned Reissue Patent No. 15,035,-known commercially by the term centerless grinders, make possible the achievement of many thoroughly prace tical advantages of which it is suflicient to point out that high degree of precision and high speed of operation are outstanding advantages; such an advantage as the latter, namely h1gh speed of operation and hence high rate of grindin production, is due in part, at least, to the act that work pieces of uniform diameter, such 'as cylindrical rolls for roller bearings, for example, can be passed completely through the apparatus, that is, between the grinding wheel and the regulating Wheel, in the direction of the axes of the work pieces, the egulatlng or controlling wheel acting to e ect a continuous movement of work pieces of this type through the grinding throat. There are, however, work iecesof such shape, such as shouldered W05; pieces or tapered work pieces, for example, which, because of their form, cannot be passed'through the appa-' ratus. A dominant aim of this invention is to provide a grinding apparatusin which such advantages of the centerless grinder as include for example, high degree of precision, may be achieved with respect to Work pieces of irregular form or shape but in such-manner that a high rate of grinding production may be achieved.

Referring now'to the drawings, and more particularly to Figures 1 and 2, the apparatus will be seen to include amain bed or frame A suitably formed at its upper surface to provide ways A and A Upon these ways are slidably-mounted the wheel carriages B and'E, adapted in any suitable manner to be slidably adjusted along the ways, as, for example, by way of the hand wheels generally indicated at D.

The carriage B is shaped to rotatably support the shaft C, the forward end of which,

, that is the right-hand end as seen in Figure 2, overhangs the main frame A and has secured'thereto' in any suitable -manner the grinding wheelG. The .carriage E is also provided with suitable bearings for supportingrotatably a shaft F, upon the forward end of which and also overhanging the-main frame A, is-secured in any suitable manner a regulating wheelR, the latter and the grinding Wheel 'G being thus substantially opposed one with respect tothe other. The grinding wheel Gris rotated at an appropriate grinding speed and in such a direction, indicated by the arrow in Figure 1, that its operative surface adjacent the regulating wheel R travels downwardly,.while the regulating wheel R is rotated in a direction, also indicated by an arrow in Figure 1, such that its operative surface adjacent the grinding wheel G travels upwardly or in. a direction away from a point intermediate'of the two wheels. The regulating wheel, however, as 1s well known in this centerlessgrinding art, is to control the rotation of the work pieces or both feed. in an axial direction and the rotation of the work pieces; it is. thereforedriven at a surface speed relatively very slow.

The regulating wheel R and the grinding wheel G, are enclosed byan appropriate housing .10 secured in' any suitable manner to the forward part of the apparatus; the housg 10, at a point substantially intermediate of the two Wheels, is shaped to provide a bridge-like portion 10 adapted to form a support fora bracket 12 adapted to be secured to thehousing 10 by way of the downwardly directed extension 11 of the bracket 12 and by way of the screws 11*.

The bracket 12 extendsupwardly and is rear of the main frame A and bifurcated at its upper end as at 14 to receive the rear end of the bar 13.

Throughout a substantial portion of the bar 13 intermediateof the two wheels, the bar 13 is provided with a work carrier or work supporting member 3-8, the latter taking the form preferably of a plate-like member (see Figure. (3) and the bar 13 being pref erably recessed or cut away (see Figure 5) to provide a firm seat for the work carrier 38. The work carrier 38 has its upper surface, which is exposed to the work pieces, inclined as indicated at 39 in Figure 6 (see also Figure 5), the-inclination of the work supporting face 39 of the work support 38 being in a direction downwardly toward the operative surface of the regulating wheel in order that the work iecesresting upon the work support 38 may e urged by gravity toward the regulating wheel and in order also to achieve other advantages due to this arrangement of parts.

carrier 38 which is not between the two wheels and adapted thus to coact in guiding the work piece along the worksupport 38 and into operative relation to the two wheels, aswill be made more clear hereinafter. In order to accommodate the apparatus for different diameters of work pieces, the plate-like members 44 an'd'44 are secured to the bracket 12 as by the screws generally indicated at 44, the-latter being adapted to permit adjustment of the

work guiding plates

43 and 44 toward or away from oneanother.

The plate member 44 is cut away at its upper portion as is also the work guide plate 44 or as indicated at 44 in both Figures 3 and 4, the recess 44 thus provided permitting the insertion therethrough and up to the work carrier 38 of a work piecesupplying trough or magazine 42 (see F igcontacting res 4 and 5). The trough 42 is preferably inclined at an appropriate angle in order that-the workpieces, indicated in the drawings at 46 in the form of tapered rolls, may' by gravity move downwardly toward the work support 38. At this point, it might be azin'e 42 is posltioned ad aCent the portlon 41 the grinding throat or intermediate of the two wheels and a portion 41 extraneous of the grinding throat but of lower vertical height than the portion 40, these two portions being connected byan inclined portion 48 in order that a work piece positioned I upon the portion 41 may be made to ride up onto the portion 40.by way of the incline '48. The upper surface of the work support 38 is inclined toward the regulating wheel, as hereinbefore noted, as at 39, but preferably throughout the three portions, 41, 48 and 40, thereof. The feeding trough or mag:

of the work support 38 and in such manner that an individual work piece may readily roll from the lower end of the trough 42 over' the edge of the inclined surface 39 of the portion 41 of the work support 38 and against the guide or contact plate 43, all as shown in Figure 5. i i

The forward end of the bar 13 (see Figure 2) has secured to it a bracket 16 carrying at its upper end a pin 18; abar 17 overhangs the bar 13 and hence also the work support 38 (see also Figure 6). The bar 17 is spaced vertically from the bar 13 and extends rearwardly between the two wheels. The forward end of the bar 17 is provided with a slot 17 within which the pin 18 on the bracket 16 engages, the connectlon being such that the bar 17 may be reciprocated in a lengthwise direction and throughout an extreme range depending upon the length of the slot 17*. The rear end of the reciprocatory bar 17 is supported by a bracket 19 provided at its lower portion with a clamping sleeve 20 extending about a slidable rod 21 and adapt-' ed to be adjustably clamped'to the latter.

The slide rod 2l extends longitudinally of the main supporting bar 13 and is slidably mounted with respect to the latter in

bearings

22 and 23 of a bracket 24 secured to the main supporting .bar 13.

The rod 21 may be reciprocated andwith .its reciprocationcontrols the movements of the slide bar 17. which is adj ustably secured thereto as hereinabove noted. The reciproe cation of the rod 21 is controlled by a cam 36 mounted upon a shaft 37 extending lengthwise of the main frame A and at the rear lating wheel R through trains of gearinggenerally indicated at38 and 38", the trains of gearing providing for any desired speed ratio between the shaft of the regulating wheel and the shaft 37 carrying the-cam 36;

' preferably such a speed ratio is provided that the cam 36 will rotate at a slower speed than the speed of'the regulating wheel shaft.

Coacting with the cam 36 is a lever 34 pivoted at its lower end in the bracket 15 and conveniently pivoted upon the shaft 72 (see Figure 1) extending lengthwise of the main frame A and at the rear thereof, and the purpose of which will be moreclearly set forth hereinafter; The lever 34 carries a roller 35 at an intermediate portion thereof for providing a rolling contact between the lever 34 and the cam 36. The upper end of the lever 34 is connected by a link 33 to the lower end of a multiplying lever 25, the latter being pivoted: at30 upon the bracket 24 secured to the main supporting bar 13. The upper end of the lever 25 carries .a pin 26 adapted to make sliding connection within the slot 27 at the upper end of an arm 28 suitably secured,.as by the sleeve portion 29 thereof, at

its lower end, to the rod 21. The rod 21 is extended rearwardly of the apparatus,(th'at is, to the left as viewed in Figure 2) and its extreme rearward end may be slidably supported in a bearing 73. A coiled spring 31 surrounds the rearward portion of the rod 21 and is confined between the bearing 22 through which the rod 21- slides and an adjustable nut 32 threaded onto the rod 21. The action of the spring 31 is to tend to urge the rod 21 rearwardly (.or to the left as seen in Figure 2)v and acts also by virtueof the levers and linkages connecting the rod 21 to the lever 34 to hold the roller 35 in contact with the cam 36.

Rotation of the cam 36 out of the position shown in Figure 2 will be seen to effect first a counter-clockwise swinging of the lever 34 and through the linkages coacting therewith to effect a forward movement of the rod 21 and also of'the work-controlling bar 17, this movementjtaking place in a direction 2, will be seen to permit, under the action of the expanding-spring 31, a movement rearwardly or to the left of the rod 21 and the work-controlling bar 17. Such rearward movement, however, will be seen to be a yieldable movement, by virtue of thejaction of the spring 31. 7

At its forward end the work-controlling bar 17 carries two plate-like members 45 and 47 (see Figure 6) each substantially overhanging the work support 38 and partaking of whateverreciprocating movement is imparted to the bar 17. The plate 45, beveled atits lowermost edge, as at 45, is of sub stantial extent lengthwise of the bar. 17 andextends downwardly toward the work support 38 to an extent sufficient to close off the lowermost open end of the trough 42 (see Figure 5.) and to prevent discharge of a the lower face. of the plate 47 and the more "Figure 6, a-work piece 46 being shown in. that figure as accommodated between the elevated portion of the work carrier 38; this relation of parts is clearly indicated in worksupport 38 and the overhanging plate member 47. The plate member 47, as will be seen from Figure 6, is adjustable in a vertical direction in order that different diameters of work may be accommodated between it andthe work support 38.

i As the work-controlling bar 17 is moved to the right, as viewed in Figure 2 (or in a direction .to the left, as viewed in Figures 3 and'6 under the control of the cam 36, the

plate member 45, up to this time having been maintained in a posltion where 1t closes the lower end of the trough 42, is moved past the lower open end of the trough 42 and into a position substantially as indicated in Fig- 'ure 4, thus releasing a work piece 46 from the trough 42 andonto the lowermost por- -plate member 47.- In bringing the tion 41 of the work carrier 38, as shown in both Figures 4 and 5. The work piece 46 (see igure 4) will thus be seen to have been positioned in advance of the plate member 45 and to have been interposed between the portion 41 of thework support 38 and 1the ate

members

45 and 47 into the position jus described, the cam 36 through its associated.

linkages has been operative to compress the spring 31 so that continued rotation of the cam 36 will permit the spring 31 tolexpand and yieldingly move the bar 17 with its associated parts, and hence also the plate member 45, in a rearward direction. The result-' ant movement given. the plate 45 (in a ,diregtion toward theright, asviewed in Figures 4 and 6) causes the right-hand vertical edge of the plate 35 to abutagainst the work piece 46 and slide it alonglowermost portion 41 ofthe Work support 38, then onto inclined portion 48 and finally onto the uppermostportiony40', the latter portion being. intermediate of the grinding and regulating wheels, the parts assuming the position shown'in Figures 3 and 6. At the same time, the plate member 45 again closes the.

lower end of the trough or magazine '42 to prevent the transfer of a. work piece from the latter onto the. work support ,38.

At this point, it might be noted that, as

the work piece is pushed into the grinding throat by the plate member 45, it is maintalned in substantial alinement wlth the work support 38 by the guide plate 44" associated with the plate member 44 (see Figures and 5) on the one hand and also by the guide plate 43 associated with the plate member 44 on the other side of the work support. The plate member 44, however, is cut away to provide a discharge trough or opening. as at 56 (see Figures 2, 3 and 4), the work-contacting plate 43 terminating at the one end of this opening 56;as will be clear from both Figures 3 and 4. In order to effect a proper introduction of the work piece into operative so relation'to the two wheels, however, there is provided an auxiliary guide plate 59 (see Figures 2, 3 and 4) positioned relatively close to the regulating wheel R and adjustably secured to the plate member 44 as by the bolt. 35 I and slot connection through the base portion 60 thereof.

Functioning within the gap thus provided between the guide plate 43 and the guide plate 59 and acting to prevent the work piece so from rolling ofi' of the inclined supporting surface of the work carrier as the work piece is moved into operative relation to the two wheels, is what may be termed a deflecting member 51, pivotally supported as at 50 by the plate member 44 (see Figures 2, 3 and 4) and yieldablfy urged inwardly toward the guide plate 44 by means of a spring 52. Thus, as the plate member 45 moves .the work piece in an axial direction along the work carrier 38 and into the-grinding throat, the

.member 51, tending to assume by virtue of the spring 52, the position shown in Figure 4, holds the work piece 46 against the guide plate 44, thus-to prevent it from falling intothe discharge chute 56, and thusalso to guide the work piece into proper relation with respect to the auxiliary guide 59 and finally into operative relation to the two wheels.

The final position assumed by the parts and 114) also by the work piece 46, when ready for grinding operation, is shown in Figure 3. The shape of the work pieces which the herein described apparatus is peculiarly adapted to handle is illustratively shown as 115 tapered, and as having therefore one end of larger d ameter than the other end. As will be seen. from Figures 3 and 6, these tapered work pieces are moved into operative relation to the regulating wheel and the grinding wheel with their smaller ends in advance. The regulating wheel R is shaped or formed (see Figures 3 and 4, for example) so that its operative portion is also tapered but to an extent preferably twice that of the taper of the work pieces operated upon. This relation of giving the regulating wheel a taper twice that of the Work piece to be operated upon is preferred where the gri-ndmg wheel G, as in the preferred. embodilengthwise ofthe work piece 46 when the latter is engaged by the regulating wheel R;

the grinding wheel G is therefore shaped so thatits operative face extends parallel to the direction of'movement of the grinding wheel and where the latter is of the peripheral form, as shown in the drawings, the grinding wheel has a shape such that any element of its operative surface is parallel to the axis of rotation of the wheel itself. The relative angles of the plate member 47 and of the work support 38 (see Figure 6) are such that the axis of the work piece, when in operative relation to the two wheels, lies in the same plane with that of the grinding wheel, thereby insuring-best lengthwise contact between the tapered or frusto-conical work piece and the straighter plane face of the grinding wheel. v

The movement of the grinding wheel G lengthwise of the work support 38 and hence lengthwise of the work piece 46 (see Figure 5) may be achieved in any suitable manner, and as illustrative merely of a possible arrangement for causing the grinding wheel Gtto reciprocate during its grinding action on the work piece 46, the shaft C, which carries the grinding wheel, is journaled in the bearings on the carriage B in such manner that the shaft C and hence the grinding wheel G may be reciprocatcd in an axial direction with respect to the supporting bearings. Conveniently the rearward end of the shaft C of the grinding wheel G (see Figure 1) has co'nnected'the'reto an arm 74 mounted upon the shaft 7 2 so that oscillation of the latter will cause a reciprocation of the shaft C in an axial direction and; a like movement of the grinding wheel G. Conveniently the oscillation of the shaft 72 may be achieved by way of an eccentric pin or crank arm 39 rotated by the shaft 37 and controlling the rocking or oscillating movement of the shaft 7 2 by coaction with an arm 7 5 secured to the shaft 72; Thus, as the regulating wheel R controls the rotation of the work piece 46 as the latter rests upon the interposed work support 38, the reciprocation of the grinding wheel insures the grinding of the tapered work pieces along a line coincident with the direction of movement of the grinding wheel and at the same time prevents the grinding wheel from wearing down unevenly, thus insuringpthe maintenance of a true or even surface on the grinding wheel.

The spring 31, the tension of which may be adjusted by means ofthe nut 32, acts, as here inabove noted, to yieldingly move the work piece into the grinding throat; it may also act, during an appropriate period of time or dwell provided for by the cam 36, to yieldingly urge the tapered work piece inwardly between the angularly disposed operative faces of the two whee1s,"as the actual grinding action by the grinding wheel proceeds; This latter action of the spring may take place to an extent permitted by the shape of the cam in controlling the extent of move-.

ment of the bar 17 and plate member in a direction rearwardly, (or to the left, as viewed in Figure 2) under the action of tlie spring 31. The angle betweenthe operative I faces of the two wheels being fixed and the extent of movement of the tapered work piece rear'wardly (or tothe' right, as viewed in Figure 3) being limited by theabovedescribed action of the cam 36, the final posis tion given each successive work piece within the grinding throat will be exactly the same 3 and all of the work pieces thus successively operated upon will thus be reduced to exact identity of form and shape throughout. Thus, a high degree ofuniformity in resultant product is assured, l

The individual work piece having been positioned into operative relation to the two wheels, and having been ground all as hereinabove described, the continued rotation of the cam 36 (Figure 2) causes the lever arm 34 to be swung in counter-clockwise direction and the slide rod or plunger 21 with its associated bar 17 to be moved in a direction toward the right as viewed in Figure 2 or in a direction toward the left, as viewed in Figures? and 4. The commencement of this movement finds the parts in the position shown in Figure 3, it being noted that the rod 21 (see also Figure 2) carries at its forward end a plunger or ejector 54, adjustably secured thereto as by the lock nut 55. Initial movement of the above-mentioned parts in a direction to the left, as viewed in Figures 8 and 6, effects first a withdrawal of the plate member 45 out of contact with the larger end of the tapered work piece 46 and brings also the ejector 54, alined with the work piece 46 when the latter is in the grinding throat, toward the smaller or inner end of the tapered work piece 46. Continued movement toward the left brings the plate member 45 into the position shown in Figure 4 wherein it again uncovers the lower end of I the magazine or trough 42 and permits'a new work piece to bedischarged from the trough 42 onto the work support 38 at the same time shown in Figure 4, the

plate members

45 and 47 having been by the abovementioned movement positioned out of range of the deflector member 51 so that the latter now contacts with the guide plate 44 of the member 44. The ejector plunger 54, in continuing itsmovement to the left, engages the smaller end of the ground work piece 46 and pushes it out of the grinding throat and in a. direction toward the left, between the guide plate 44 and the auxiliary guide 59. The

- deflecting member 51,'however, in having assumed the position shownv in Figure 4, is thus positioned in the path of return move;

' ment of the ground work piece and causes the latter to be deflected off of the work carrier 38 and into the discharge chute 56.

The continued rotation of 'the cam 36,

having during the above described operation ofejec'ting the ground work piece andsimultaneous. positioning of' a new work piece upon the work carrier 38, effected a compression of the spring 31, now permits the latter to expand and effect a yieldable movement of the bar 17 and the plate member 45 (see Figures 4 and 6) in a direction toward the right, thereby to "carry the work piece newly positioned upon the work carrier '38 into operative relationfto the two wheels and onto the more elevated portion 40 of the work support 38. Thus, a new cycle of operations ising wheel with respect to the introduction of the work into operative relation to the two wheels may be timed as desired, depending upon the relation between the controlling eo- "eentric for reciprocating the grinding wheel 7 with respect to the cam 36 controlling the movements of the parts which act directly upon the work piece. Furthermore, it is to be understood that the gearing arrangement may be modified as desired. to give any suitable or desired relative timing of the act-ion of the parts or to give any desired amount of reciprocation of the'grinding wheel for operation on an individual work piece. It may also be noted that the shape of the cam 36 is preferably such that it is provided with a portion concentriewith the shaft 37 in orderdhat the work piece-controlling bar 17 may be at rest for an appropriate interval of time'during which the grinding operation is to take place; and that it is further so shaped as to give a relatively rapid forward or work ejecting movementto the bar 17 and associated parts followed by a slight dwell in i order to allow ample time forthe transfer of a new Work piece from the magazine or trough 42 onto the work support 38. It will furthermore be noted that the reverse movement of the parts is yieldably effected under the action of the sprlng 31 and that the cam 36 is further shaped so as to permit the initial movement brought about by the spring 31 to be substantially gradual and then more rapid as the work piece is introduced into the grinding throat, whence the first above-mentioned dwell for the purpose of permitting the grinding action to take place follows, as above described. It may further be pointed out that the mechanism and apparatus are so arranged that, during all movements given the individual work piece, the latter is effectively held or restricted against .being thrown out of its intended ,alinement with respect to its direction of travel; the yield ing action of the spring 31 in yieldingly forcing the work piece into the grinding throat is furthermore of advantage in that, for example, jamming of the apparatus due to the possible disarrangement of either the work piece .or any of the parts coacting therewith is effectively avoided.

It will thus be seen that the apparatus is fully-automatic throughout and thoroughly fool-proof, and as illustrative of how such advantages as these are achieved, the coaction of'the slidable plate members 45 and 47 (see Figure 6) with respect to the peculiarly shaped work support 38 may be noted. It has already been pointed out hereinabove that the plate member 45 acts to maintain closed and to open at predetermined intervals the.

lower end of the magazine or trough 42 and the difference in vertical height between the portion 41 and the port-ion 40 of the work support 38 has also been pointed out hereinabove. As also noted above, the trough 42 is positioned with its lower end adjacent the portion 41 (of lesser height than the portion 40) of the work support 38. When the parts assume the position shown in Figure 4, the plate member 45 uncovers the lower end of the trough 42 but the same movement which has brought the plate member 45 into the position shown in Figure 4, has, however, brought the plate member 47 opposite the lower end of the magazine or trough 42, as is clearly shown in both Figures 4 and 5.

The plate member 47 is adjustable in a vertical direction, as shown in Figure 6, and it is so adjusted that, when positioned in front of the lower end of the trough 42, the

vertical spacing between the lower edge of I the plate member 47 and the upper edge of the portion 41 of the work support 38 is just sufficient to permit the passage therebetween .of a work piece from the trough '42 and thus onto the work support 38. This relation of the openingbetween the plate member 47 and the portion 41 of the work support, 38 is clearly shown in Figure 5 of the drawings. Thus, should by chance an over-size work piece get into the trough 42, its transfer onto the work support 38 is effectively prevented and the resultant jamming of the mechanism avoided. When it is desired to operate upon work pieces of different diameters, the various guide plates are appropriately adjusted in a lateral direction and the plate member 47 adjusted vertically with respect to the I lowermost portion 41 of the work support 38,

with respect to the horizontal so that, When the plate member 47 is positioned in front of the lower open end of the trough 42 and overhangs the upper horizontal edge of the portion 41 of the work support--38 (566 F igure 6 and also Figure 5), the space between the plate 47 and the Work support- 38 and through which said space the workpiece must pass onto the work support 38 is tapered, having its larger endtoward the left, as viewed in Figure 6, or toward the forward portion of the apparatus. Through the tapered opening or space thus provided by the eoaction of the inclined edge 47*" of the plate 47 with the edge 41 of the work support 38, the tapered work pieces can pass only with their larger ends toward the forward portion of the apparatus. Thus, should any work piece in the magazine or trough t2 become reversed therein with respect to its intended position, it cannot pass through this tapered space or opening, and the introduction of the tapered work piece reversed end for' end into the grinding throat cannot take place.

It will thus be seen that positive and-accurate control of the movement of the work piece into and out of the grindingthroatis effectively achieved and that, furthermore, the mechanism is arranged to accurately position the work piece within the grinding throat; and, furthermore, that, when so positioned, such extraneous forcesas are eX- erted upon the work piece due, for eXample to the streamof cooling vfluid supplied to the apparatus at the grinding throat, are

. effectively prevented from displacing the work piece.- It will thus be seen that there has been provided in this invention an apparatusin which the several objects hereinbefore noted, as well as many thoroughly practical advantages, are successfully achieved and that the apparatus isof a thormade of the above invention, and as many changes might bemadc in theembodiment above-set forth, it is to be understood that all matter herei'nbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

I claim 1. A centerlessgrinder including-in conibination, opposed grinding and regulating wheels and an intermediate work rest; and.

means for terminally and laterally engag, v

ing the work piece to hold the same in determined position on the work rest.

2. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at relatively high speed, a regu- I lating wheel adapted to be rotated at rela tively lowspeed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, means for guid ing work of round section into and out of operative relation to said two wheels, means for positioninga workpiece onto said guiding means from a point transversely disposed with respect to the path of travel of the work piece provided by said guiding means, and means which acts first to move a work piece along said guiding means and into operative relation to said two wheels and which thereafter acts to give the work piece a retrograde movement along said guidmg means.

' 3. In a centerless grinder, the combination with opposed grinding and regulating wheels forming a work receiving throat therebetween and a work rest disposed within the throat, of a member oscillatab ly mounted above the work rest and provided'with means for first moving a work piece along said work rest and into operative relation to said two wheels and then moving it in reverse direction for ejecting the work piece from said grinding throat.

4. In acenterless grinding machine, the

combination with opposed grinding and regulating wheels forming a work receiving throat therebetween, of a work rest disposed within the throat for holding a work piece in operative relation to said two wheels, means for moving a work piece in an axial direction and out of the grinding throat,

and means for deflecting said moving work piece from said work rest.

5. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, said whcels'being adapted to present adjacentoperative surfaces traveling in opposite directions, means for guiding work of round section into and out of v operative relation to said two wheels, means for positioning a work piece onto said guiding means from a point transversely disposed with respect to the path of travel of the workpiece provided by said guiding means, means for moving a work piece along said guiding means and into operative relation to said two wheels and for thereafter giving the Work piece a retrograde movement along said guiding means, and means for removing a completed work piece from said guidingmeansand in a direction substantially transverse thereof.

'6. In apparatus of the character de cr bed,

in combination, a grinding'wheel adapted to :be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, said wheels bein adapted to present adjacent operative surtaces traveling in opposite directions, a work supportextending between said two wheels, means'for yieldably moving a work piece along said work support and into operative relation to said two wheels, and means for moving a completed work piece out of operative relation to said two wheels. V

7. Inapparatus of the character described;

in combination, a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, a work support extending between said wheels and adapted to hold a workpiece in operative relation to said two wheels, a magazine for holding a supply of work pieces, and means for introducing an individual" work piece from said magazine into operative relation to said work support and formoving the work piece along the latter into operative relation to said two wheels.

8. In a centerless grinder, the combinationof means roviding a grinding throat for reception 0 work and a work rest disposed within the throat, of an oscillatable member for'alternately feeding Work into the throat into the grinding throat, and means for mov ing said member to elfect ejection of a finished work piece.

19. A centerless grinder including, in combination, a regulating wheel and opposed re- .ciprocable grinding wheel forming a work receiving throat, and work rest disposed in the throat, means for yieldingly urging work into a position on the rest within the throat, positive means for reciprocating the grinding wheel, and means for positively ejecting the work from the grinding throat. 11. A centerless grinder including, in combination, a regulating wheel and opposed reciproeable grinding wheel forming a work receiving throat, work rest disposed in the throat, means for yieldingly urging the work i to position on the rest within'the throat, dsitive means forreciprocating the grinding wheel, means for ejecting the work from the grinding throat, and meansfor operating said grinding wheel, reciprocating means and work, ejecting means in predetermined timed relation. V

12. In a device of the character described,

the combination with a work rest, of auto-, matic feedlng and e ectin mechanism for supplying work pieces to the work rest, and

the ejection mechanism for interrupting the normal movement of the work piecesas impelled thereby.

1 3. In a device of the character described,

- and means co-operating with said mechanism 'at different points in the stroke thereof-for alternately introducing and removing work pieces from the path of movement thereof.

14L. In a device ofthe character described including, in combination, means providing a grinding throat and a work rest disposed within the throat, reciprocable means for introducing and withdrawing the work at one side of the throat, and means providing stations for supplying work pieces tothe reciprocable member for introduction into the grinding throat and for receiving the completed work pieces at a different point in the stroke of said reciprocable member. v

15. A centerless grinder including, in combination, opposed grinding and regulating wheels forming a work'receiving and grinding throat therebetween, a support extending between said wheels and subtending the grinding throat, a work rest carried by the support and projecting into the grinding throat, guides carried by the support, work feeding and ejecting members carried by the guides, and means for operating said members in timed relation.

16. A centerless grinder including, in combination, opposed grinding and regulating wheels forming a work receiving and grinding throat and aework rest projecting within said throat, means for terminally engaging a work piece to place the same within the grinding throat, and additional means for subsequently terminally engaging the work piece to eject the latter from the grinding throat.

throat, means co-operating with the rest for terminally and laterally engaging the work an interrupter projectable-into the path of pieces and positionin the same within the throat, and additional means for terminally engaging the primarily unengaged end of the'work piece for ejecting the same from the grinding throat.

19. A centerless grinder including, in combination, opposed grinding and regulating members forming a work receiving and grinding throat therebetwecn and a'support extending between said members, a work rest carried by the support in fixed position and projecting into the grinding throat, guides on the support at opposite sides of the grinding throat, a bar slid-ably supported by men tain of the guides and carrying work-engaging means adapted upon movement in one direction to move a work piece into said grinding throat, means coacting with other of said guides adapted upon movement with respect thereto and in a reversed direction to move the work piece'out of said grinding throat, and means for actuating said last two mentioned meansin predetermined timed relation and ejecting members.

20. In apparatus of the character de-- scribed, in combination, a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, said wheels being adapted to present adjacent-operative surfaces traveling in oppositedirections, and meansfor guiding work of round section into operative relation to said two wheels, said means including a member shaped to change the path of travel of the work from a position out of alinement with respect to the operative portions of said wheels to a position between said wheels and operatively related thereto.

21. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, said'wheels being adapted to present adjacent operative surfaces traveling in opposite directions, means for guiding work of round section into operative relation to said two wheels, said means including a member shaped to change the path of travel of the work from a position out of alinement with "respect to the operative portions of'said wheels to a position betweensaid wheels and operatively related thereto, and means operative at said first-mentioned position in the path oftravel of the work adapted to position a work piece operatively with respect to said guiding means.

22. In apparatus of the character described, in combination, means forming a grinding throat including, a grinding wheel and a regulating .wheel, a work support for holding work in operative relation to said two wheels, means movable-in a direction toward said grinding throat for moving a Work piece lengthwise with respect to said work grinding throat includin support and into operative relation to said wheels, and means movable in the opposite direction for giving the work piece a retrograde movement, thereby to remove it from the grinding throat.

23. In apparatus of the character described, in COlllbllltttlOll, means forming a grinding throat including a grinding wheel and a regulating wheel, a work support for holding work in operative relation to sald two wheels, means associated with said work support and movable lengthwise with respect .thereto, and providing two spaced members between which a work piece, alined with respect to said work support, may be inserted, and means for giving said last -menj tioned means a movement in a direction to ward saidgrinding throat, thereby to cause one of said members to'etl'ect'an introduction of the work piece into operativerelation to said two wheels, and for giving said lastmentioned means a retrograde movement,

work support into operative relation to said two wheels, a magazine tor holding a supply of work pieces including means coacting therewith for positioning anindividual work piece' from said magazine in a position to be engaged by said work-introducing means, and means movable in a direction awayi rom said grinding throat adapted to remove a completed work piece from the latter.

25. In apparatus of the character described, in combination neans forn'iing a g a grinding wheel and a. regulating wheel, awork support for holding work in operative relation to'said two wheels, means movable in a direction toward said grinding-throat and adapted to engage a work piece and move it along said work support into operative relation to said wheels, meansffor positioning an individual work piece into operative relation to said work piece introducing means, means movable in a direction away from said grinding throat "for givin a com aleted work iece a n retrograde movement along said work support, thereby to remove the work piece from the grinding throat, and means for moving the work piece out of operative relation with respect to. said last-mentioned means.

26 In apparatus of the character de scribed, in combination, means forming a grinding throat including a grinding wheel I and a regulating wheel, a work support for holding work-in operative relation to said two wheels, means spaced from said work support and movable lengthwise thereof and providing two spaced members between which a workpiece may be inserted, means for giving said last-mentioned means a movement in a direction toward said grinding throat, thereby to cause one of said members to move said work piece into operative relation to said wheels, and for giving said means a retrograde movement, thereby to cause the other of said members to remove the work piece from said grinding throat, and means operative prior to-etfective workintroducing movement of one of said members for positioning a work piece in advance thereof.

27. In apparatus of the character described, in combination, means forming a grinding throat including a grinding wheel and a regulating Wheel, a work support for holding work in operative relation to said two wheels, means spaced from said work support and movable lengthwisethereof and providing: two spaced members between which a work piece may be inserted, means for giving said last-mentioned means a movement in a direction toward said grinding throat, thereby to cause one of said members to move said wo k piece into operative relation to said whee s, and for giving said means a retrograde movement, thereby to cause the other of said members to remove the work piece from said grinding throat, and means operative upon the ejecting movement of one of said members to remove the ejected work piece out of operative rela tion therefrom. 1

28. In apparatus of the character described, in combination, means forming a grinding throat including a'grinding wheel and a regulating Wheel, a work support for holding ,work in operative relation to said .two wheels, means spaced from said work support and movable lengthwise thereof and providing two spaced members between which a work piece may be inserted, means for giving said last-mentioned means a movement in a direction toward said grinding throat, thereby to cause one of said members to move said work piece into operative relation to said wheels, and for givingv said means a retrograde movement, thereby to cause the other of said members to remove the work piece from said grinding throat, and means operative to first remove an ejected work piece from in between said two members and for inserting another work piece therebetween.

29. In apparatus of the character described, in combination, a grinding wheel adapted to berotated at relatively high speed, a regulat ing wheel adapted to be rotated at relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, means for guiding a work piece of round section into operative relation to said two wheels, a magazine for holding a supply of work pieces and operatively related to said guiding means, and intermittently operative means adapted to provide an opening through which an individual work piece may be passed from said magazine into operative relation to said guiding means, the opening effected by said last-mentioned means being of a shape and size to just permit the passage therethrough of work pieces intended to be operated upon by the apparatus, thereby to prevent the introduction into the apparatus of an over-sized work piece.

30. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed,.said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, means for guiding a work piece of round section into operative relation to said two wheels, a magazine for holding a supply of work pieces and operatively related to said guiding means, means for moving a work piece along said guiding means and into operative relation to said two wheels, and means operating in timed relation therewith and providing an opening for the passage 01 a work piece from said magazine into operative relation to said guiding means and to said work piece moving means, said opening being of a shape and size to prevent the passage therethrough of an oversized work piece.

31. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, means for guiding a work piece of round section into operative relation to said two wheels, said means including a work support having a portion intermediate of the two wheels of greater elevation than a portion exterior thereof, a magazine associated with said work support but positioned adjacent the portion thereof of lower elevation and adapted to hold a supply of work pieces, means movable lengthwise of said work support and past a portion of said magazine adapted in one position to prevent the transfer of a Work piece from said magazine into said guiding means and to hold a .work piece in operative relation to the wheels but on the portion of said work support of higher elevation and adapted in another position to opensaid magazine to permit the transfer of a work piece from the latter onto that portion of the work support which is of lower elevation.

32. In apparatus of the character described, in combination, a grindingiwheel and a regulating wheel forming a work-receiving and grinding throat therebetween and shaped to receive therebetween a work piece of irregular shape, means for guiding a Work piece of irregular shape into operative relation to said wheels, and means providing an opening of a shape commensurate with that of the work pieces to be operated upon and through which a work piece is introduced into operative relaopening through which a work piece is int-roduced into operative relation to said guiding means, thereby to prevent introduction of a work piece into the tapered grinding throatin reverse relation.

3a. In apparatus of the character described, in combination, a grindlng wheel and a regulating wheel shaped to provide a tapered 'work receiving and grinding throat, means for guiding awork. piece into operative relation to the two wheels, a magazineffor holding a supply of tapered work pieces, means for moving a tapered work piece along said guid- Iing means and injecting it into said tapered grindlng throat, and means for permittlng the transfer of a WOIli piece from said magazine into operative relation to said workinjecting means and adapted to prevent the operative positioning with respect to said work piece injecting means of a tapered Work piece reversed end for end.

35. In apparatus of the character described, in combination, a'grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, said Wheels being adapted to present adjacent operative surfaces traveling in opposite, directions, means for guiding a work piece of round section into operative relation to said two wheels, and means adaptedto provide an opening through which an individual work piece may be passed into operative relation to said guiding means, the opening provided by said last-mentioned means being of a shape and size to just per-' mit the passage therethrough of work pieces intended to be operated upon by the appas ratus;,thereby to preventthe introduction into the apparatus of, an OVQFSlZGd work piece. v p

36. in apparatus of the character described, in combination, a grinding wheel adapted to berotated at relatively high speed,

' a regulating wheel adapted to be rotated at relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, means for guidlng a workplece of round section into operative -relat1onto said two wheels, means adapted for intermittent actuation for'eifect- Lng movement of -awork piece along said guiding means, and means adapted to provide an opening through which an individual work piece may be passed into operative relation to said guiding means and to said lastmentioned means, the opening provided thereby being of a shape and size to just permit the passage therethrlough of work pieces intended to be operated'Lnpon by the apparatus, thereby to prevent the introduction into the'apparatus of an over s'ized'work piece.

37. In apparatus of the character described, in combination, a grinding-wheel adaptedto be rotated at relatively high speed, a. regulating wheel adapted to be rotated at relatively low speed, said wheels being adapted to presentadjacent operative surfaces traveling in opposite directions, means for guiding a work piece of round section into operative relation to said two wheels, means adapted for intermittent actuation for;- effecting movement of a Work piece along said guidingmeans, and means operative in timed-relation with respect to said intermittently actuatable means adapted upon operation thereofato provide an opening through which an individual work piece may be passed into operative-relation to said last-mentioned means, the opening efiected thereby being of a shape and size to just permit the passage .therethrough of:

work pieces intended to be operated upon bythe apparatus, thereby to prevent the introduction into the apparatus of an over-sized} it work piece.

38.111 apparatus of the character described, in combination, a grinding wheel of the work support and move the work piece into operative relation'to said two wheels, said means being provided with a member shaped and spaced from said more elevated portion of the work support to prevent subio's adapted to be rotated at relatively high speed, 1 I l stantial movement of the work piece in a direction transversely of its axis and adapted when adjacent said lower portion of the work support to permit the insertion therebetween of a .work piece.

39. In apparatus of the character described, in combination, a grinding Wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, saidwheels being adapted to present adjacent operative surfaces traveling in opposite directions, means for guiding a work piece of round section into operative relation to said two wheels, said means including a work support having a portion intermediate of the two wheels of greater elevation than a portion exterior thereof, said portion of the work support intermediate of the two wheels having a work engaging face inclined downwardly toward saidregulating wheel, and means movable lengthwise of said work support and adapted to move a work piece along the latter and into operative relation to said two wheels, said last-mentioned means being provided with a member adapted when in juxtaposition to the portion of said work support intermediate of said Wheels to prevent substantial movement of the Work in a direction away from the work support and adapted when in juxtaposition to said lower portion of the work support to permit the insertion therebetween of a work piece. V 40. In apparatus of the character described, in combination, a grinding wheel and a regulating wheel shaped to provide a tapered work-receiving and grinding throat for simultaneous grinding action on the work by the grinding wheel and rotating action thereon by the regulating wheel, and means for yieldingly urging a work piece into said grinding throat and in a direction from the larger end thereof toward the smaller end. 41. In apparatus of the character described, in combination, a grinding wheel and a regulating wheel shaped to provide a tapered work-receiving and grinding throat for simultaneous grinding action on the work by the grinding wheel and rotating action thereon by the regulating wheel, means for yieldingly urging a work piece into said grinding throat and in a direction from the larger end thereof toward the smaller end, and means for limitin to a predetermined extent the action of said last-mentioned means.

42. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, means for moving a work piece in an axial direction into operative relation to said two wheels, spring means adapted upon being tensioned to move said last-mentioned means, and means for ten- .sioning said spring means.

43. In apparatus of the character described, in combination, a grinding wheel adapted'to be rotated at relatively high speed,

.a regulating wheel adapted to be rotated at messes travellng in opposite directions, means for moving a work piece 111 an axial dlrection mto operative relation to said two wheels,

. s rin means ada )ted 11)O11 bein tensioned to move said last-mentioned means, and power actuated means for intermittently tensioning said spring means.

44:. In apparatus of the character described, in combination, means forming a four-sided grinding throat comprising a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, said wheels presenting adjacent operative surfaces traveling in opposite directions, a member for taking up the thrust of the grinding wheel upon the work, and a member for taking up the thrust of the regulating wheel on the work; and means mounting one of said members for movement in a direction substantially axially of said grinding throat.

45. In apparatus of the character de scribed, in combination, means forming a four-sided grinding throat comprising a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively-low speed, said wheels presenting adjacent operative surfaces traveling in opposite directions, a member for taking up the thrust of the grinding wheel upon the work, and a member for taking up the thrust of the regulating wheel on the work; means for moving a ,work piece of round section along one of said members and into operative relation to said two wheels; and means for moving the other of said members substantially concurrently with the movement of the work piece.

- 46. In apparatus of the character described, in combination, means forming a four-sided grinding throat comprising a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively low speed, said wheels presenting adjacent operative surfaces traveling in opposite directions, a member for taking up the thrust of the grinding wheel upon the work, and a member for taking up the thrust of the regulating wheel on the work; means for moving one of said members in a direction substantially lengthwise of the grinding throat; and means coacting with said movable member for moving a work piece relative to the operative surfaces of said two wheels.

47. In grinding apparatus. in combination, a grinding throat adapted for simultaneous grinding and rotating action upon work of round section and comprising four members, one of said members being in the form of a grinding Wheel adapted to be rotated at a relatively high speed, another of said members being in the form of a regulating wheel adapted to be rotated at a relatively low speed and 1n a direction to present an opone of said members in a direction substantially lengthwise of the axis of said grinding throat and thereby permit the insertion into or removal from the latter of a work piece.

48. In grinding apparatus, in combination, a grinding throat adapted for simultaneous grinding and rotating action upon work of round section and, comprising four members, one of said members being in thr. torm of a grinding wheel adapted to be rotated at a relatively high speed, another of said members being in the form of a regulating wheel adapted to be rotated at a relatively low speed and in a direction to present an operative surface traveling in a direction opposite from that of the adjacent grinding wheel surface and adapted therebytocontrol the rotation of the work, another of said members being adapted to hold a work piece "against the thrust'of the grinding Wheel, and Y the fourth of said members being adapted to hold a work piece against the thrust of the regulating wheel; means for moving one of said members in a direction substantially lengthwise of the grinding throat; and means coacting with said movable member for moving a work piece relative to another member of said grinding throat.

49. In apparatus of the character described, in combination, means 'forming a grinding throat including a grinding wheel and-a regulating wheel adapted for simultaneous grinding and rotating action upon work of round section, yieldably acting means for moving a work piece into said grinding throat, and positively acting means for movmg a work piece out of said grinding throat,

50. In apparatus of the character deing throat and provided with two spaced. members between which a work piece may be scribed, in combination, means forming a grlndlng throat including a grindmg wheel and a regulating wheel adapted for simul-" taneous grinding and rotating action upon work of round section, and means movable relative to said grinding throat for controlling the movement of awork piece relative to the latter, said means being constructed and arranged to act yieldingly for moving a work piece into the grinding throat and to act positively for moving the work piece out of the grinding throat. v a

51. In apparatus of the character de scribed, in combination, means forming a grinding throat including a grinding wheel and a regulating wheel adapted for simultaneous grinding and rotating action upon work of round section, means movable in a direction substantially lengthwise of said troduction of the work piece into operative relation to said two wheels and for giving said last-mentioned means a retrograde movement, thereby to cause the other of said members to eject the work piece from said grinding throat, one of said members acting yieldingly. Y

52. Inapparatus of the character described, in combination, means forming a grinding throat including a grinding wheel and a regulating wheeladapted for simultaneous grinding androtating action upon work of round section, and means mounted *for reclprocatlon in a direction toward and away' from said grinding throat and provided with two spaced members between which a' work piece may be inserted and moved into or out of said grinding throat.

53. In apparatus of the character described, in combination, means I forming a grinding throat including a grinding wheel and a regulating wheel adapted for simultaneous grinding and rotating action upon work of round section, means mounted for reciprocation in a direction toward and away from said grinding throat and provided with two spaced members between which a work piece may be inserted and moved into or out of said grinding throat,.,and mechanism for reciprocating said last-mentioned means, said mechanism having included therein a yieldable link operative to effect yieldable move-' ment of said means during one stroke. 1 54. In apparatus of the character described, in combination, means-forming a grinding throat including a grinding wheel and a regulating wheel adapted for simultaneous grinding and rotating action upon work of round section, means mounted for reciprocation in a direction toward and away from said grindi-nserted and moved into or out of said grinding throat, and means for reciprocating said last-mentioned means and adapted to cause onestroke thereof to be yielding.

- 55. In apparatus of the character described, in combination, means forming a grinding throat including a grinding wheel and a regulating wheel adapted for simultaneous grinding and rotating action upon work of round section, means for guiding a work piece into and out of operative relation to said two wheels, and means projectable into the'path of movement of a work piece as the latter movesalong said guiding means and. away from said .grinding throat for deflecting a .work piece from said grinding means. 4

56. In apparatus of the character described, in combination, means forming a grinding throat including a grinding wheel and a regulating wheel adapted for simultaneous grinding and rotating action upon work of round section, means for guiding a work piece into and out of operative relation to said two wheels, means for moving a work p ece along said guiding means and into said grinding throat and for thereafter giving the work piece a retrograde movement, and means projectable into the path of retrograde movement of the work piece for deflecting the work piece from said guiding means.

57. In apparatus of the character described, in combination, means forming a grinding throat including a grinding wheel and a regulating wheel adapted for simultaneous grinding and rotating action upon work of round section, means for guiding a work piece into and out of operative relation to said two wheels, means for moving a work piece along said guiding means and into said grinding throat and for thereafter giving the work piece into and out of operative relation' to said two wheels, means for moving a work piece along said guiding means and into said grinding throat and for thereafter giving the work piece a retrograde movement a portion of said guiding means being cut away, and a member projecting through said cut away portion of said guiding means for deguiding means during movement thereof in a fleeting a work piece therethrough during retrograde movement thereof and adapted to hold a work piece in operative relation to said direction into said grinding throat.

59. In apparatus of the character described, in combination, means forming a grinding throat including a grindlng wheel and a regulating wheel adapted for simul:

taneous grinding and rotating action upon work of round section, means for guiding a work piece into and out of operative relation to said two wheels, means for moving a work piece along said guiding means and into said grinding throat and for thereafter giving the work piece a retrograde movement a. portion tanatially close said cut away portion of said guiding means and in another position to pro- ]ect into said guiding means for deflecting from the latter a work piece during retrograde movement thereof, and means for yieldably urging said member into its deflecting position.

60. In grinding apparatus, in combination, a grinding throat adapted for simultaneous grindingand rotating action upon work of round section and including three means, one ofwhich means is in the form of a grinding wheel adapted to be rotated at a relatively high speed, another of said means being in the form of a regulating wheel adapted to be rotated at a relatively low speed and in a direction to control the rotation of work during the grinding action thereon by said grinding wheel, and the third of which means includes a member for holding work in operative relation to said two wheels; a magazine; and means driven from said slow speed regulating wheel for transferring a work piece from said magazine to said grinding throat.

61. In grinding apparatus, in combination,

grinding and rotating action upon work of round section and including three means, one of which means is in the form of a grinding wheel adapted to be rotatedat a relatively high speed, another of said means being in the form of a regulating wheel adapted to be rotated at a relatively low speed and in a dirction to control the rotation of work during the grinding action thereon by said grinding Wheel, and the third of which means includes a member for-holding work in operatively relation to said two wheels; a magazine; mechanism adapted upon actuation to transfer a work piece from said magazine to said grinding throat; means adapted to eifect discharge of a ground work piece from said grinding throat; and means whereby said mechanism and said discharge-effecting means are driven from said slow speed regulating wheel'in proper sequence.

In testimony whereof, I'have signed my .name to this specification this 16th day of April, 1925.

CLEMENT BOOTH.

of said guiding meansf'being cut away, a movable member adapted in one position to suba grinding throat adapted for simultaneous