US2546914A - Grinding machine for shear blades or the like - Google Patents

Description

March 27, 1951 H. c. WHEELER GRINDING MACHINE FOR SHEAR BLADES OR THE LIKE 4 Sheets-Sheet 1 Filed March 5, 1949 ATTORNE\.

HENRY E..WHEELER H. C. WHEELER 4 Sheets-Shet 2 March 27, 1951 GRINDING MACHINE FOR SHEAR BLADES OR THE LIKE Filed March 5, 1949 R. m a I m l VL 0 .IL im E w m NE E A fi II W I ll l l l I I I l l II Q u N M m m N m m NM E rv H I Em l i I Ev mi N NE m l m\ NE E ow QR .MW $l.m mfi ms h k4 ME NE b Qm q& I \M Ex 5;: 0 MN MN m fi. n. Q E &N. \E 1% mm I Q 1% R. Em

Mrch 27, 1951 I H. c. WHEELER GRINDING MACHINE FOR SHEAR BLADES OR THE LIKE 4 Sheets-Sheet 3 Filed March 5, 1949 wmwm INVENTOR. HENRY DWHEELER ATTORN EY.

March 27, 1951 H. c. WHEELER 2,546,914

GRINDING MACHINE FOR SHEAR BLADES OR THE LIKE 4 Sheets-Sheet 4 Filed March 5, 1949 4 INVENTOR. HENRY [LWHEELER ATTORNEY.

Patented Mar. 27, 1951 GRINDING MACHINE FOR SHEAR BLADES OR THE LIKE Henry 0. Wheeler, Fairfield,

The Acme Shear Company,

Conn., assignor .to Bridgeport, Conn.,

a corporation of Connecticut Application March 5, 1949, Serial No. 79,843

13 Claims.

The present invention relates to a grindin machine for shear blades or the like, and has for its object to provide an automatic machine of this character in which a continuous succession of shear blades or the like, placed in successively arranged carriers, are carried by an endless conveyerinto grinding relation with one or a succession of grinding wheels, or other suitable grinding means, and whereby the grinding operation is carried out rapidly, uniformly and with a precision-that is usually only obtained by slow hand grinding methods requiring highl skilled operators. Shear blades are ground with a helical surface, and it is particularly proposed to provide carrier means for the blades adapted to hold them in a precisely predetermined angular relation as they move in relation to the'grinding wheels, to produce such helical surface. It is further pro-' posed. to provide guide means for feeding the bladecarriers into and out of relation to the grinding wheels, and for maintaining them, between the points of engagement and disengagement .of the blades with respect to the grinding wheels, in a given arcuate path of travel about the. grinding wheel peripheries.

Another object is to provide guide means for the carriers adapted to swing into and out of relationwith the grinding wheel surfaces so that the entire area of each blade surface to be ground is at, once brought into and out of engagement with the grinding wheel surface, thus preventing the partial or edge grinding of such blade surface...

A further object is to provide carriers for the blade into which they may be loosely placed by the operator of the machine, and having clamping means adapted to be brought automatically into retaining relation to the blades to hold them during the grinding operation, and to be disengaged; automatically from the blades to release them at the completion of the grinding operation.

With the above and other objects in view, an embodiment of the invention is shown in the accompanying drawings, and this embodiment will be hereinafter more fully described with reference thereto, and the invention will be finally pointed out in the claims 1; In the, drawings:

Fig; 11' is a side elevation of the grinding machineiflccording to the illustrated exemplary embodiment of the invention, the same being shown partially broken away.

Figs. 2; is a top plan view of the main frame of the machine, partially broken away, the grind-. inggwheels and; the conveyer for the blade carriers being removed.

1 Fig. 9 is a vertical transverse sectional 'Fig. 3 is a vertical sectional view, on an en-. larged scale, taken along the line 3-3 of Fig. 1. Fig. 4 is a vertical sectional view, on anem larged scale, taken along the line 4-4 of Fig. 1. Fig.5 is a plan view on a further enlarged scale of one of the blade carriers, the position of a blade-being indicated by the dot-and-dash lines, and. the blade retaining means being shown in blade gripping position.

Fig. 6 is an end view of the blade carrier..

Fig. 7 is a side elevation, partially in vertical section. Fig. 8 is a plan view showing the blade retain. lng means in blade releasing position.

view. taken along the line 9-9 of Fig. 5, the dot-anddash lines indicating the conveyer chain con nected thereto.

Fig. 10 is a plan view of one of the nest strips employed for positioning the blade in the care ner. Fig. 11 is a t ansverse sectional view, taken along the line I |-ll of Fig. 10.

- Fig. 12 isa plan view of another of the nest strips for positioning the blade in the carrier.

I Fig- 13 is a sectional view taken along the line l3-l3 of Fig. 12. Fig. 14 is a detail vertical sectional view, on a further enlarged scale, taken along the line I4-l 4 of Fig. 5. Fig. 15 is a horizontal sectional view, taken along the line l5-l5 of Fig. 14. Fig. 16 is a vertical sectional view, taken along the line Iii-l6 of Fig. 5. v

Fig. 17 is a vertical sectional view taken along the line l'|-.-l'l of Fig. 5, the dot-and-dash lines indicating one of the operative positions of the part illustrated therein. I Similar reference characters indicate corresponding. parts throughout the several figures of the drawings. Referring to the drawings, the grinding maI-J chine, according to the illustrated exemplary embodiment of the invention, comprises a main frame consisting. of a pair of end table supports, indicatedgenerally as H! and H, the table supportlll comprisingapair of leg members |2-l2 having a bracing shaft l3 bolted between them, and having. a horizontal table bed i4 bolted to their upper ends, a. pair of vertical bearing plates l5l5 being bolted to the table bed M. The table support II is substantially similar to the table support In, and comprises leg members l6-.,l.5 having a bracing shaft l1 bolted between them and having a horizontal table bed "bolted to theirg fupper ends, a pair of vertical bearing plates IS-l9 being bolted to the table bed. A pair of longitudinal side plates 26-26 extend between the end table supports I6 and H and have their end portions rigidly secured to the inner sides of the bearing plates l-l5 and I9-I9 by bolts 2| and 22, a series of transverse T-braces 23 being disposed between the side plates 26 and rigidly secured at their ends to the inner sides of the side plates, preferably by welding.

The machine of the invention contemplates the automatic feed of a succession of shear blades into relation with one or more grinding wheels, or other suitable grinding means. The general term grinding is employed-and intended to describe such specific operations as grinding, polishing, bufling and the like. For the present illustration there is shown a machinehaving two longitudinally spaced grinding wheels, one of the grinding wheels and its associated parts Ice-- ing fully shown and the other grinding wheel and its associated parts being partially shown. It will'be understood that in the case of a single grinding wheel being employed theoverall length of the machine will be materially shortened; and in the case of a succession of two or more grinding wheels the overall length will be increased as requiredto accommodate the additional units and provide the necessary space between them. It is further pointed out that in providing a succession of grinding wheels the first grinding wheel will usually be of a type to perform a preliminary or rough grinding operation upon the blades, and the successive grinding whee1s will be such as to produce intermediate and finishing grinding operations, the complete grinding 'Of the shear blades being thus carried out in the onemachine. a r

In the bearing plates l5 of the table support In thereis journaled insuitabl'e bearings 24 a conveyer mounting shaft, 25 ;u'p0nwhich are secured a pair of sprocket wheels 26-26, the shaft being providedupon oneflof its ends with a spur gear 2! engaged by a pinion gear 28 mo'unted'up'on one end of a "counter shaft 29 journaled in suitable bearings 36-36 in the bearing plates l5, this counter shaft b'eingrprovided upon its other end with a sprocket gear 3| driven through a sprocket chain 32 from a sprocket wheel 33 of a power unit, indicated generally as 34, this power unit including an electric motor 35, suitable reduction gearing providedin a reduction gearing housing 36 and a friction clutch drive 31 betweenthe reduction gearing and the sprocket wheel 33.

In the bearing plates [9' of the table support;-

It there is mountedfor longitudinal adjustment ashaft 38 provided with a pair of sprocket wheels 39-39 .inhlongitud'inai line with the sprocket; wheels 26-26, this shaft .r-being rotatably sup-'- ported at its Tends-in bearing blocks 46-40, slideably mounted for longitudinal adjustment in slideways 4I-4I provided in the respective bear i-ng plates IQ-l9, these blocks being engaged at their inner sides by adjustment screws 42-42 set the ends of the slidewaysl4l-4l and beingfined in their positions of adjustment by lock: nuts 46- 43, turning bf the adjustment screws moving the bearing blocks longitudinally in the slideways; Two parallel endless conveyor sprock= 't 44-44, in which a'series'of equally spaced blade carriers are set, as will presently more fully 'agpeaa-a e'anried ab'outthe sprocket whens 26-2 6 afid"39- 39, ;andthrough the drive a he 's-haft25 from'the ower ehains are caused to travel diicated by 'tlie arrowin Fi The blade carrier units, indicated generally as 45, each comprise a rectangular body member 46, best illustrated in Figs. 5 to 9, provided at each of its ends with a downwardly extending flange 47 in which a pair of roller studs 46-48 are secured by nuts 49-49, and upon which are mounted cylindrical rollers 56-56, one roller being provided in projecting relation at each of the four corners of the body member 46. At the underside of the body member substantially adjacent each of the flanges 47 there are secured by rivets 5! a pair of angular brackets 52-52, each having apertured ears 53-53 in which are engaged the end pins 54-54 of the two sections of the sprocket chain 44 connected to the blade carrier, thespacing of the end pins 54-54 corresponding to the spacing of the other pins connecting the links of the sprocket chain, so that the brackets 52 in effect constitute a link of the sprocket chain adapted to be engaged by the teethof the sprocket Wheels as the blade carrier moves about the sprocket wheels.

The upper traverse of the conveyor constitutes the working path of the blade carriers during; which they move into relation with the grinding wheels,,as will presently more fully appear, and the lower traverse of the conveyor constitutes the return path. In the movement of the carrier-.-

along the upper working path the carriers are guided along the intervals between the sprocket wheels and the grinding wheels and between the successive grinding wheels by a series of hori zonta'l trackways at each Side of the machine;- these trackways each consisting of a pair of parallel rails 56 and 56 secured by screws 5'! to the inner sides of the upper end portions of .a series of vertical supporting bars 53 secured by screws 59 to the outer sides of the longitudinalside plates 26. The rails and 5'6 are YeSpeC-"i tively provided at their opposed faces with right angular channel recesses 60 and 61 in which the rollers 56 of the blade carriers are guided and having rolling engagement with the lower ree: cesses 6|, the horizontal path of movement or the blade carriers in the trackways being tangen I tial to the sprocket wheels 26 and 39. In the movement of the blade carriers along the lower return path they are supported in inverted vposition on inwardly projecting ledge bars 62-62 secured upon'the lower sides of the side plates 26, 1 the rollers 56 having rolling contact with these ledges. At theends of the ledge bars adjacent the sprocket wheels 26-26 there are securedtd the inner sides of the bearing plates 15 downwardly flared ledge members 66-63 arranged in continuation of the ledge bars for the purpose of providing a flared entrance for engagement of the r'ollers'withth'e ledge bars. 1 I 1 The grinding-wheels" "B4 are mountedabove t upper traverse of the conveyer-"in suitable su'p' ports fand each grinding wheel is preferably provided with an individualdriving motor, in icated as 66. The grinding wheel "may if 'desi be constructed or "suitable grinding, poush'in bin-Ting" or similar material, but preferably e material i carried on an endless ban'de gaged over the wheel as a supportj'this band else. being engaged over a suitable wheel or pulley, not showm 'spaced above thewh'eel 64. The peripheralsurface of the grinding wheel may be suitably" contoured, as shown, for example, in Fig.3, the case of grinding operations requiring such contoured periphery, the flexible band 64 readily cenforming to this contour. The grinding wheel's may rotate in'either direction depending upon the particular placement of the blades in the blade carriers. In moving in relation to each of the grinding wheels the blade carriers are guided through an arcuate path about the periphery of the grinding wheel, and for this purpose there are mounted upon the side plates 2il-2U, between the spaced ends of the horizontal trackways at each side of the grinding wheels, a pair of channel guide plates 61-61.

These channel guide plates are mounted for vertical adjustment upon the inner sides of the side plates 20-48, each being provided for this purpose with a pair of longitudinally spaced lugs 68-68 projecting through slot openings 6969 inthe side plates, these lugs each having fiattened upper and lower surfaces respectively engaged by vertically disposed upper and lower adjustment-screws and 1| mounted in angular brackets 12 and 13 secured by screws 14 to the.v

outerside of the respective side plate. Thus by adjustment'of the screws the channel guide plates may be vertically adjusted, and also angularly adjusted, to bring about proper alignment with the horizontal trackways as well as the proper relation to the grinding wheel. The adjusted position of each of the channel guide plates is fixedby flat head screws 15-15 screwed therein and engaged in vertical slots 16-16 in the respective side plate 20, a washer 11 being disposed beneath each screw head for binding engagement with the side plate upon tightening of the screw.

The channel guide plates each project substan-.

tially above the upper edges of the side plates 29, and their upper projecting portions are relatively thicker than the lower portions engaged with the side plates, an outwardly disposed shoulder ledge 18 being provided at the lower edge of the upper thickenedportions directly above the upper edge of the side plate and which is adapted to limit the downward adjustment of the channel guide plate. At the inner side of each of the channel guide plates near its upper edge there is provided an arcuate channel groove 19 having horizontal channel grooves 80-4!!! at its ends in longitudinal alignment with the horizontal guide ways and 56, the upper edge of the channel guide plate being concavely recessed in parallel relation to the channel groove 19.. These .channel grooves are thus continuous with the horizontal trackways and provide arcuate trackways for the rollers of th'eblade carriers, so that the shear blades are successively moved in a path about the periphery of the grinding wheel, being tilted into and out of engagement with the grinding wheel surface as the rollers move from the horizontal to the arcuate channels. To this end the spacing of the rollers atieach side of the blade carrier is such that the entire surface of the shear bladeto be ground is 9.11 once brought into contact with the grinding wheel as the forward and rearward spaced rollers both become engaged with the ar-..

cuate channel grooves. and the ground surface is at, once disengaged from the grinding wheel through tilting the blade carrier as the forward rollers move from the arcuate channel groove to the horizontal channel groove. While the arcuate channel groove appears to be substantialh concentric to the grinding wheel periphery, it is in fact slightly eccentric, so that the space between them is slightly convergent to thus maintaina con tantly engaged relation of the blade with thev wheel as its surface is ground and dimen sionally changed.

.zll-lee'b ade ca ier .45.: asbest .shownin. Rigs. 5..

to 17 is adapted to permit angular adjustment of angle at which the blade is held as it moves in.-

relation to the grinding wheel, andfor: this purpose there is mounted upon the flat upper side of the body member 46 a rectangular swivel plate 8i, provided with a centrally disposed hole 82 engaged by a pivot plug 33 secured in the body member it. At each end of the swivel plate 8| there is provided an arcuate slot 84 concentric to the pivot plug 83 and engaged by a set screw 85, the head of which is seated against a countersunk shoulder 86 of the slot. Upon loosening of the screws the swivel plate may be swung about the pivot stud B3 to any desired angular position, within the limit of adjustment determined by the lengths of the slots 34, the adjusted position being} secured'by tightening the set screws 85. w

Within a, rectangular recess 81in the upper side of the swivel plate there is secured by means of screws 88 extending upwardly from the underside of the plate SI, a nest plate 39 for supporting the shear blade, this nest plate having secured. upon its upper side, by means of screws 90 extending upwardly from its under side, a pair of, side nest strips 9| and lhsuitably beveled as at. Q3 and 94, to conform to the beveled outer side, surfaces of the shear blade, and being suitably, notched as at and 9%, to conform to the shouldered base of the shear blade adjacent its' handle portion. Asclearly shown in Figs. 5 and 6, the surface of the blade to be ground is slightly raised from the upper surfaces of the side nest strips. The outer sides of the side nest strips, 'as well as the outer edges of the nest plate 89, and the upper surface of the base of the recess 81,; are beveled, as at 31 and 98, so that clearance spaces are provided at each side of the blade surface to be ground, to thus enable the blade carrier to swing into relation with the grinding wheel to engage the surface of the blade to be ground therewith, without contact of any part of the blade carrier with the grinding wheel.

The handle portion of the shear blade I is; adapted to be resiliently supported, and for this purpose a support plate 99 is engagedina diagonally disposed slot 106, provided in the upper side of the swivel plate 8| at its portion to the right of the recess 81, as seen in Fig. 5, being resiliently mounted upon a pair of coil springs Nil-int, disposed in sockets screws Hl3ili3 screwed into the base of the sockets, the screw heads being seated in pockets lB4l 34 in the support plate. The support plate normally projects slightly above the swivel plate,

as shown in Fig. 16, and is adapted to be. de-

pressed through downward pressure applied to the handle of the shear blade. The shear blade is adapted to be firmly held by clamping means, presently to be more fully described, and the resilient support of the handle provided by thesupport plate 99 prevents any possibility of the handle being strained to the point where it wil fracture or bend. It also compensates for any irregularity in the handle portion which might otherwise prevent proper seating of the blade in the nest plate. f

The body member 46 of the blade carrier is provided at one side of the center and adjacent one longitudinal edge with a downwardly projecting bearing hub portion Hi5, having a cylin-.: drical bore H16 in which is secured by a force fita cylindrical bearing bushing Nil having its upper end flush with the upper side of the body member and its lower end upwardly. offset from the lower side. Upon the upper side of the body member lil2i 62 about shoulder.

there is secured, by means of a pin I08, a cam ring I09 having-'21 cylindrical bore III'Iin register with the bore of the bearing bushing I01, and having a radially disposed cam recess IlI in its upper surface, this recess having a fiat base surface-and upwardly and outwardly beveled end surfaces. Rotatably engaged in the bearing bushing I07 is a-vertical shaft I I2 upon the upper reduced diameter end of which there is secured, by means of a screw H3, and a countersunk washer H4, the hub portion of a clamp member H5,- thisclamp member being fixed against rotation upon the shaft by a diametric slot H6 in its lower side engaged by flats IIl-I I? provided on the shaft. The clamp member l I 5 includes a projecting arm portion having a convex clamp surface H8 at'its underside adapted in one position of the clamp member to engage the base of the shear blade, as shown Fig. 5, and in another position to be disengaged from the shear blade, as shown in Fig. 8.

In moving into and out of engaging relation with'the shear blade the clamp member is adapted to be lowered and raised substantially vertically, so that there is no appreciable wiping engagement with the shear blade. For this purpose the clamp member is provided at its underside with a round headed clamp raiser pin H9, set in a hole i223, this pin being normally disposed in the 6am recess III of the cam ring I39 with the under surface of the clamping member in engagement with the upper surface of the cam ring, being yieldably held in this position by a spring I'2I engaged about the lower end of the shaft H2 between the upwardly offset end of the bearing bushing H2 and the hub portion I22 of a clamp operating lever arm I23 secured upon the lower end of the shaft. Swinging of this lever arm, as will hereinafter more fully appear, is adapted to impart swinging movement to the clamp.

As-the clamp is swung from its closed or clamping position, as seen in Figs. 5 and 14, the pin I l 8 rides up upon one of the beveled end surfaces of the cam recess III and on to the upper surface of the cam ring, thus raising the clamp member, as shown in Fig. 8, this being the open or releasing position of the clamp member. As the clamp member moves into clamping position it remains raised from the surface of the shear blade until it is directly above it, whereupon it is lowered into engagement with the shear blade as the pin H9 re'engages the cam recess I I i. Upon the end of the lever arm !23 there is provided a roller I24, rotatably supported upon a headed screw stud I25, secured to the lever arm by a nut I26, this roller adapted'to engage cam means provided in the. mach ne, 'forthe purpose of automatically aper'atingthe clampmember into clamping and unclamping-positions, as will presently more fully appear.

A cylindrical collar I2? is engaged about the cam ring I09, and projects above it to provide a dirt shield for the cam recess III and the space between the clamp member and the cam ring, this collar being engaged with a force fit upon the cam ring .and being slideably engagedby the hub portion of the clamp member. The swivel plate 8I is provided with a cut-out I28 concentric to the pivot stud for clearing the clamping mechanism as the swivel plate is moved between its positions of adjustment. A pair of stop posts I29 and I30 are secured upon the underside of the body member 46, and are positioned to respectively abut the lever I23 in its limit positions, as indicated respectively in Figs. 5 and 8.

' being disposed in the path of travel of the clamp release the ground shear blades.

operating rollers I25 of the successive blade car: riers, the clamp members of which are in open position at this point in their travel. This card causes the lever arm I23 andthe clamp member i I5 connected thereto to swing into clamping engagement with the shear blade disposed in the carrier, as shown in Fig. 5;

It is pointed out that an operator of themachine feeds the shear blades into the carriers at a point to'the right of the closing cam, as" seen" in Fig. l. A shoe I-35'having a rounded nose L36 is mounted upon a bracket arm I37 secured by bolts I38 to oneof the side plates 20, this shoe be ing situated so that it engages the shear'b'lade in the carrier as it moves into relation'with the closing cam, to insure that it is properly seated in the nest plates of the carrier between the side. nest strips. The shear blades are thus firmly held in the carriers as they travel into grinding relationwith the grinding wheels.

At a suitable point along the lower traverse of the conveyer there is provided a clamp opening cam 39, mounted upon a bracket I48 secured to one of the T-braces 23 by screws I4 I, the inclined surface I42 of this cam being disposed in the path of travel of'the rollers I24 of the clamp operating lever arms I23 of the blade-carriers in the closed position of the clamp members, and is adapted'to' swing the clamp members into open position to Asthe blade carriers 'are in inverted position as they move along the lower traverse of the conveyer, the'released blades drop by gravity into a suitable receptacle or conveyer means for moving them away from the machine.

I have illustrated and described a preferred and satisfactory embodiment of the invention, but it will be understood that changes may be made therein, within thespirit and scope thereof, as defined in the appended claims.

What is claimed is: l

1. In a grinding machine for shear blades'or; the like, a grinding means having a'circumferential peripheral grinding surface, a conveyer suitably supported and driven beneath said grind" ing means and including a series of successively arranged blade carriers, horizontal guide means longitudinally at each side of said grinding means for guiding said blade carriers into and out of relation therewith, and arcuate guide means in spaced relation to the'grinding surface of said' grinding'means for guiding said blade carriers in an arcuate path about said grinding surface, said blade carriers each having longitudinally spaced front and rear guide'engaging means whereby said blade carriers are tilted as said front and rear guide engaging means are simultaneously in engagement with said horizontal and arcuate guide means.

2. In a grinding machine for shear blades 'or the like, a grinding-means having a circumfer-f' ential peripheral grinding surface, a conveyer suitably supported and driven beneath said grind ing means and including a series of successively arranged blade carriers, horizontal guide means longitudinally at each side of said grinding means" for guiding said blade carriers into and out '61" relation therewith, and arcuate guide means in spaced relation to the grinding surface of said grinding means for guiding said blade carriers in anarcuate path about said grinding means, said .Iplade'carriersjeach having longitudinally spaced front, and rear guide engaging rollers whereby said blade carriers" are tilted as said front and rear guide. engaging rollers are simultaneously in engagement with said horizontal and arcuate guide means.

3. In a grinding machine for shear blades or the'like, a grinding'means having a circumferential peripheral grinding surface, a conveyer suitably supported and driven beneath said grinding means and including a series of successively arranged blade carriers, said blade carriers each having-blade supporting means inits'uppe'r side, transversely spaced horizontal-'guide'---means at each side 'tofsaidnconveyer and longitudinally at each side of said grinding, means for guiding said blade carriers into and out of relation therewith,

and transversely spaced arcuate guide means at each'side of said'conveyer inspaced relation to the grinding surface of said grinding means for guiding said blade carriers in van arcuate path about said grinding surface, said blade'carriers each having longitudinally spaced front and rear spaced guide engaging means at each side whereby said bladecarriers are tilted as said front and rear guide engaging means are simultaneously in engagement with said horizontal and arcuate guide means.

4. In a grinding machine for shear blades or the like, a grinding means having a circumferential peripheral grinding surface, a frame including a pair of transversely spaced longitudinally extending side plates, conveyer carrying wheels mounted at the ends of said frame, drive means having driving connection with-at least one of said wheels, an endless conveyer carried by said wheels and driven beneath said grinding means and including a series of successively arranged blade carriers, guide means supported on said side plates at each side of said conveyer for supporting and guiding the upper longitudinal traverse of said conveyer and including arcuate guide means in spaced relation to the grinding surface of said grinding means for guiding said blade carriers in an arcuate path about said grinding surface, and guide means supported on said side plates at each sideof said conveyer for supporting and guiding the lower traverse of said conveyer.

5. In a grinding machine for shear blades or the like, a grinding means having a circumferential peripheral grinding surface, a frame including a pair of transversely spaced longitudinally extending side plates, conveyer carrying wheels mounted at the ends of said frame, drive means having driving connection with at least one of said wheels, an endless conveyer carried by said wheels and driven beneath said grinding means and including a series of successively arranged blade carriers, guide means supported on said side plates at each side of said conveyer for supporting and guiding the upper longitudinal traverse of said conveyer and including vertically and angularly adjustable arcuate guide means in spaced relation to the grinding surface of said grinding means for guiding said blade carriers in an arcuate path about said grinding surface, and guide means supported on said side plates at each side of said conveyer for supporting and guiding the lower traverse of said conveyer.

6. In a grinding machine for shear blades or the like, a grinding means having a peripheral grinding surface. a co'nveyer ,,suitably supported and driven beneath said, grinding; means and in.- cluding a series of successivelyjarranged blade carriers, each comprising a horizontal'body mem.,- be and'a horizontal blade supporting member mounted for angular adjustment on said body member about a vertical axis.

7. In a grinding machine for shearblades, or the like, a grindingmeans having a peripheral grinding surface, a'conveyer suitably supported and driven beneath said grinding means and including a series of successively arranged blade carriers, each comprising a body member, and blade positioning means having arecessed blade nesting rigid, portion and ablade handle sup; porting resilient portion. v In a grinding machine for shear blades or theilike, a grinding means having a, peripheral grinding surface, 'a conveyer suitably supported and; driven beneath said grinding means and me cluding a series of successivelyarranged blade carriers, each comprising, a body member, and blade positioning means having a recessed blade nesting portion anda resilient blade handle sup: porting portion, and a clamp member mounted in said body member for movement into and out of clamping engagement with the upper side of saidblade.

9. In a grinding machine for shear blades or the like, a grinding means having a peripheral grinding surface, a conveyer suitably supported and driven beneath said grinding means and including a series of successively arranged blade carriers, each comprising a body member, and blade positioning means having a recessed blade nesting portion and a resilient blade handle supporting portion, and a vertically yieldable clamp member mounted in said body member for movement into and out of clamping engagement with the upper side of said blade.

16. In a grinding machine for shear blades or the like, a grinding means having a peripheral grinding surface, a conveyer suitably supported and driven beneath said grinding means and including a series of successively arranged blade carriers, each comprising. a body member having blade supporting means in its upper side, a clamp member pivotally mounted in said body member for swinging movement into and out of clamping relation with said blade and having limited axial movement, spring means arranged to impart downward axial movement to said clamp member, and cam means operative through the swinging movement of said clamp member to impart upward axial'movement thereto.

11. In a grinding machine for shear blades or the like, a grinding means having a peripheral grinding surface movable in a circumferential grinding path of a predetermined radius, a conveyer suitably supported and driven in relation to said grinding means including a series of successively arranged blade carriers, guide means longitudinally at each side of said grinding means for guiding said blade carriers into and out of relation therewith, and arcuate guide means in spaced relation to said peripheral grinding surface constructed and arranged to guide the movement of said blade carriers in an arcuate path about said circumferential grinding path to engage the blade surfaces to be ground with said peripheral grinding surface and to move said surfaces in the same circumferential grinding path therewith, and whereby the ground surfaces of said blades are concavely ground in one direction upon a radius corre am de 121 spending to the predetermined radius of said circumferential grinding path.

' '12. The invention as defined in claim 11, further characterized by adjustable mounting means for said arcuate guide means constructed and arranged to place said guide means in eccentric relation to said peripheral grinding surface'whereby the path of movement of said blade carriers converges toward said peripheral grinding surface from one end to the other of said guide means.

'13. In 'a grinding machine for shear blades or the like, a grinding means having a peripheral grinding surface movable in a circumferential grinding path of a predetermined radius and said grinding surface having a predetermined transverse'grinding contour, a conveyer suitably supported and driven in relation to said grinding means including a series of successively arranged blade carriers, guide means longitudinally at each side of said grinding means fforguiding said blade carriers into and out of relation therewith, and arcuate guide means in spaced relation to said peripheral grinding surface constructed and arranged to guide the movement of said blade carriers in an arcuate path about said circumferential grinding path to engage the blade sure faces to be ground with said :peripheralgrindin surface and to move said-surfaces in the same c'ir cumferential grinding path therewith. and whereby the ground surfaces of said blades are concavely ground in one direction upon a radius corresponding to the predetermined radius of said circumferential grinding path and are ground in the other direction to conform to the predetermined transverse grinding contour of said grinding surface.

HENRY C. WHEELER.v

REFERENCES CITED UNITED STATES PATENTS Number Name 1 Date j 29,680 Disston Aug. 21,1850 575,562 Block Jan. I9, 1897 r 697,383 .Milligan etgal. Apr. 8, 1902 741,537 Nousse Oct. 13, 1903 1,908,029 Larson May '9, 1933 FOREIGN PATENTS Number Country Date 302,946 Germany Jan. 11, 1918

Images