US1876314A - Blade sharpening machine - Google Patents

Description

Sept. .6, 1932.

w. EL mcKERsoN BLADE SHARPENING uAcHIn-E 6 Sheets-Sheet 1 Filed Aug. 24, 1927 vive? 7?.

Z'M'ckerjom MM mqy W. E. NlKER$ON BLADE SHARPENING ummm 'Filed Aug. 24, 1927 6 Sheets-Sheet 2 l sept. s, 19amA @sept 6, 19324 w. E. NlcKr-:RSON

' BLADE SHARPENING MACHINE 6 Sheets-Shet 4 Filed Aug. 24, 1927 W. E. NICKERSCN ,BLADE SHARPENING UACHINE Sept. s, 1932.

` Filed Aug. 24. 1927 6 SheetsnShget 5 Sept. 6, 1932.

w. E. NlcKl-:RsoN

BLADE SHARPENING IACHINE med Aug. 24. 1927 e sheets-snm s nvenr. VVLZZzQWzEJViCePSQn l Patented Sept. 6, 1932y UNITED srTEs PATENTl OFFICE WILLIAM ZEKER!" NICKERSQKQF BOSTUN, MASSCHSETTS, SSIGNOR TO GILLETTE SAFETY RAZOR COIPANYQF BOSNIE ISSQHUSETTS, A CORPORATIDN GF DELA- 'WARE sxmsnmo miennes Murmel-'inea um ai., m7. semi No. nasse.

This invention relates to blade-sharpening machines, and morel particularly to ma chines for sharpening blades having curved edges. The object of the invention is to provide a machine which. willfautomatically sharpen such blades with accuracy and uni formity, and which will be capable of such adjustments as will adapt it toproduce the curvature desired in any given blade edge, the

thickness of the blade, and thefangle, width` and concat-ity ofV the edge bevel.

The features in which my invention reside are hereinafter described in connection with the accompanying drawings, insvliichw Fig. 1 is a. plan view of the machine; Fig. 2 is a vertical section en .the line 2--2 in Fis. 1; i

Fig. 3 is a section on the line, 7,.-3 in Fig.. 1; Fig. 4 isa plan view illustrating one ad C justed relation of the bladeholjding parts to h harpening i l Fi g. 5 is a similar view showungthe bladeA the abrading wheel during t operation;

holding parts in loading and u tinus Fig. 6 is a detail view illustratingthe son struction of the blade supports.4

. Fig. 7 is a, detail view in sectie `Q on the line 77 in Fig. 4;

Fig. 8 is a section on the line 8--8 in Fig. 1; Fig. 9 is an elevation of the blade-supportl ingy unit as viewed from the front ofthe mm chine; Y

Fig, 10 is a detail view, in section, of'a 'part ofthe unit shown iny Fig. 9; i v

Fig. 11 is a horizontal section taken online :l1-1l in Fig. 3 and Fig. 12 is a plan view of a. blade on.l which the machine is adaptedr to operate.

Figs. 3&12 inclusive are drawn to a larger scale than the remaining figures.

In general, the machine illustrated in cludes a blade-carrying unit and' an abr'adng unit which are conveniently supported by individual base piecesr bolted to a general base plate A, to which also are secured certain other parts employed forproducing variousy ment in a predetermined path between the blade and the sharpening means, the former being acted upon during such oscillatory movement by an abrading element included in the sharpening means. Said element preferably consists of a rotating disk of which the angular position of the axis relative to the portion of the edge bei-ng sharpened remains constant during the period of contact between said disk and the blade, and provision is made formoving the blade into a convenient loading and unloading position after it. has been operated upon by the abradir-.g disk. The parts are so constructed that such adjustments ma be made as will enable the machine to pro uce aecuratelyfformed edges of any desired curvature and bevel contour within the limits of adjustment.1

The parts constituting the bladeholding unit in the machine .illustrated include a base piece B 'carrying a fixed vertical spindle B1 .having journaled thereon a sleeve B2 which may have a ball-bearingB interposed between its lower end and the top ofthe base after described. A blade clamp is secured to the top of another sleeve B4 rotatable about the same axisas the sleeve B2 and here shown as j'oural'ed on the spindle B1 and resting on-- the upper end ofthe sleeve B2. The sleeve B4 is independent ofsleeve B2 in its movements except as later described, thereby pro vi'dng for the movement of the hladeclamp into loading and unloading position, but during the sharpening operation these two sleeves are caused to oscillate in unison by means of a coi-led spring B5 surrounding the sleeve B2 and secured at its ends to the two sleeves respectively, this sprin being underk sulli'cient tension normally to lqiold a stop B6 on the sleeve B4 firmlyy against another stop B7 on the sleeve B2 during the oscillations of the latter sleeve. The stop B6 on the sleeve B4 is shown as a solid stop, Figs. 2 and 9, and tire stop B7 on. the sleeve B2 may consist of a bolt horizontally and' adjustably mounted .in a bracket B8 secured tothe sleeve B2.

The blade clamp, of which the details are showny in Figs. 4, 5, 6 and Z includes horizontal topl and bottom plates B9 and B10 respectively. The plate B10 is preferably made -piece BY," the sleeve B2 being oscillated as herei sharpening device during the oscillation of the;sleevesaisjyso determined that.` 'the l point of A,thegblade travels ijust to thea'brading:` dej vice on yeach oscillation.

The upper clamping plate B^9 .may be;

pivoted toV a block B-13 bolted tothe rear beingi surrounded by a coiled spring B-lwhic i I y r y 7 every 'sii'cli"movement"nis"` permitted. At its' 'frontedgiethe 'tipp'erclamp plate B-k-9 has an outline-fSiniiiftftime ef the blades to: be,

operated upon, 'as shown ink Fig. 4,; and lo ver`. lies a 'plateBf-Llion'which the rbladesrest. duringthcsliarpcningfopcration, the late 134-16' being detachably; secured to the, ront portion ofthefbottom' plate, Bl() and being provided with :si'iitSable]inea-ns for positioning the blade such asjthe'pins B-l'shown in'y Fig'.4. "'Thecontourof the upper clamp platel B9and` thelocati'on of the positioning pins B`117A sh'own'fiii 4 are suitable for use .wahl-the vSpfeeiin.forni of blad@V Bla-:issues- I Y. lifted with v For p forcingl vthe: upper clampplate B9 y carried by the Standard C2, includes a rotary .bd` ik during thesharpening operation,l I em loy a ra mg dis D"w 'lch'may be madeof any a plunger-i0 movable vertically in the ront;`

trate'd in llin'ggflQ whic providedfw'ith af straight back e de;

oration B-19fan`dpsh y 'rhelbiadeisfposieioneioniire plate Basie ty placing its back (Viutermost ,j-PlIlS, B-rl'fald Pi'lSS'lIg Lill" lltemedmt P1117@ chine), and 'a driving and timing mechanism which 'controls the operation `of the cam VATdriiimaccordingtocycle of operations of the :machine with which it is used- A In the present case the'cams employed will have suchshapes and will be so-located with reference f, i l v t nto one another Aasto operatethe various arts-j anotherv having positioningl pins :differently splaced andjlocatedthereonto adapt the' inal` ihrtugif'ihe permise@ islieiin institue, Fig. @andas rigiai-'yiieidinthis posata dur;

ing the sharpening; operation I'neans fof,

ldowirwartyl'on'it asi ve re'iiiafterdescribed.` The plate 13e-16 canbe retrieved 'and replaced'by ine to 'shrpnvzblades of varioussizes and wshapesr' jAt itslfront -e'dgeon 'the under side the clamp i plate 5B"-;%'9" is' preferably provided springBf-QO located in aY recessvformedpi eclampplate and serving to hold:theblade:uponj 'the plate B'"1'6 during f vthe first partfftheupward movement of the ,50

late B-9, f thereby preventing the blade rom adhering to'thela'ter :plate and/being downwardand'causing it lto grip the blade end of a backet'C secured to a standard C2, which'ais carried by the general base plate at the "rear cfthemachine. The axiso' the plunger 'C is coincident with ythe axis of` the spindle B1 and' when the plunger is forced downward', vits smoothly finished vlower end" bears on 'the' top of 'a'sinooth stud B231v se cured' to vthe u per clamp plate B9 and pro# )ecting upwar therefrom, thus enabling the d in thetopuofthe sleeve. 6i` By this 'adjustmeiit' tothe upper end of the plunger C by means," oiga 'link C4. "Ne'ar'its rear endtlie lever C3" is"v connected'to the"standa-r'd(52by a 'coiled spring C5 tending to lift the plunger @fthe i-plunger'being forced downward by means of a rodQ connected at its lower end to the reirendof the'lever C3 and at its upper end to a suitable operatingniechanism which l will be liereinafterreferred to as tthe .over- ,head mechanism.` The guide pin lCfrpros ported on jec'ting from "the plunger Cinto .avertical i enc'y of the plunger to. turn `on accountof the frijctional1 y drag y exerted .on it ,by the oscillat-l in blade carriert at ltheir fpoint ofcontaca slot C8 in the bracket C', overcomes any .tend-i l v yhelovefrhead mechanismdis tliagrammat-` ically illustrated in Fig. 2, by the cam drum K-Q levers K-\22, and pressure controlling valve casing K-i-28 and maybe constructed in''accordan'ce with. the voverhead mechanism shown and. described in my prior Patent No. 1,235,590, dated August 7th,',1917, in which `Figs.1i,f19Eaiid 20 illustrate the mechanism Yfinqu'e'stio'n; "Briefly described, thi's mechanism` includes a rotary drum carrying a numofythe machinev according ytofthe cycle ere- Aberief cams, each ofrwhich serves to lift a pull ,rod (such asl 'the ,rod C6`in thepresent vmav inafter'ldescribed. It will be observed on reference to Fi 1:8` of my prior'patent that each of the pnl ods 'has a spring interposed between-it and-the cam-operated lever which lifts it, and lthe vsame arrangement is ein- 'ployed in connection with thesprescnt inachine, so that after any ull rod such as C6 lhas completed itsu'pwa'i movement the coi'- res'ponding spring willprovide fora certain p amount ofdost motion in the operating cam,

The abrading unit, the parts of which are stropping 'as'desired, mechanism for rotating justingjti in various' ways with reference to i cavity of t'lie'bevcl. "In designing'the abrad-l tween the ,blade and 'the abrading disk Dls taken as a reference point and is 'assumed shaft D4 by iexible driving means, as the belt D-5, the countershaft D-4 being journalled in blocks D-6 located near the rear of the machine and carried by a support D-7, Figs. 3 and 8. Between the bearing D-8 and the support D-7 is interposed an arm D-8 which has the bearing D-B at its forward end, and is p ivotally connected at its rear end to the supportl D--7v by providing` it with threaded pivot pins D-9 having points extendin into lugs D`10 carried by the support D in such manner as to enable l the disk D to be raised and lowered inits plane sufficiently to move it out `of or into contact with the blade B-18. The abrading action of the disk in a downward directionmay be Vlimited b means ot'v a stop screw D-1l, Fig.. 3,.whic is preferably made adjustable vertically by threading it into thearm D-8, the screw` D-ll resting atitslower end'on a bearingplate D-12 mounted on a vcarriage D13, which also serves' indirectly to carry the support D-7, the vertical position of the carnage.

D-13 with reference to the base Abeing xed. The upper end of the stop screw' D-ll is .preferably provided with a head D--14 by means of which it may be turned and which may have thereon 'a graduated scaleD-15, Fig. 1, the adjustment of the stop screw D--ll being'indicated by the position of this scalewith reference to a suit-l able index such as the upstanding ost D-16 fixed in the arm D-8 as shown in i 3,Vv `A spring, D--17 may also be secure to the arm D-l-.8 and provided at its upper end with a projection D--18 adapted to enter any one of a number of shallow notches D-119 formed on the outer ed e of the head -D-14, thus serving ,-to hol the screw D-11 against accidental .displacement after adjustment. By meansl of this stop screw the extent of the abrading action may be so limited that in grinding, for example, only the upper half of the blade will be acted'upon.

That side of the support' D-7 which is remote from the belt D--5 is provided with bearing portions, wherebyk the support is pivotally mounted on a pintle D--20, carried by two upwardly and laterally directedarms D--21 in turn carried by a block D-22, the pintle D--QO being so positioned that its axis, if prolonged, would pass through or closely adjacent to the above described ref` erence point D1 so that by turning the support D-7 on this pintle, the angular position of the plane of the disk D maybe adjusted with respect to theplane of the blade without materially varying the point of contact between the disk andthe blade.'v This adjustment may be made and maintained by means of a rod D-23, Fig. 8, secured at its upper end to a link D--24 pivoted to the underside of the support D-7 adjacent to the belt D-5, and having its lower end passing loosely through an elongated aperture D-25 formed in an ear D-QG which projects laterally from the rear end of 'the carriage D-l3, the rod D--23 being provided at its lower end with a pair offlocklng nuts D-27 adapted to engage the upper and lower facesy respectively of the ear D-26, whereby the rod may be adjusted with respect to the ear D-26 and slot D--25 and locked in anyk desired position. n

The block D-f22 is provided with a downwardly extending circular boss D-28 which is received in a similarly shapedrecess in slide member D`29 extending downwardinto a slot D--30 in the bifurcated` rear end of the carriafgferD'-l.` The block D--22 -may be angularly adjusted' with 'respect to the slide member D'-29 by` looseni'ng the bolts D-Bl which pass through circumferential slots D-32 in the block D--22 and are threadedY into the slide member D-`29. A bolt D-33 passes centrally through an aperture in the slide member D--29 and is threaded into the block D-22, this bolt having a" washer orenlargement adapted to engage the carriage D-13 on both sides of the slot D-30 and thus hold the slide member D-29 in adjusted position in the slot D-30. -The purpose of the angular adjustment betweenv the vparts D-29 and D-22 is not primarily for use in the operation of the machine, but

rather to compensate for inaccuracies in the making or assembling of the various parts, so as to bring the reference point D1 exactly over the edge of the blade at their point of contact and in the desired position relative thereto. When the slide 'member'D-f29 is adjusted longitudinally of thefslot D-30, the

vlwith the reference point D-l on the disk D, and therefore, also with the spot being acted upon. The effect vof such adjustment of the carriage is to change'the angle of the plane of the disk D with respect to a line tangent to the blade edge at the point where the. disk D bears on it, and consequently this determines the direction of the abrading action with respect/ to the blade edge. This adjustment en once made does not need to be altere ,/and in practice it will suice to secure t e carriage D--13 in a predetermined one several different angular positions by providing the bracket D`34 with a number of threaded apertures D-35 into any one of which a clamping bolt D-36 passing through the carriage may be screwed.

Provision is made for automatically 'raising and lowering the disk D by means of a pin D-37 which passes through the carriage D-13 and is capable of sliding vertically therein, its upper end being located directly beneath a boss D38 formed on the underside of the arm D--8.` Beneath the lower end of the pin D-37 is located a pressure-operated cylinder D-39, the upper end of which is enlarged and serves to support the lower end of the pin D-37 in any position of the carriage 'I3-13. The piston D--40 is provided with an enlarged base D-ll rigidly fixed to the base A and has a perforation D-42 passing through it from end to end in line with the open end of a pipe 1)-43 passing through the base A and adapted to convey iiuid under pressure to the interior of the cylinder, the admission of the Huid to the pipe D-43 being automatically controlled in any desired manner, as by the overhead mechanism above referred to, which may include a suitable controlling valve K28 operatedl by one of the cams on the drum as explained in my prior patent above referred to. The admission of fiuid pressure to the pipe D-43 will result in lifting the cylinder 1)-39l and with it the pin D-ST until the latter strikes the boss D-38, thereafter lifting the arm D8 and disk D until the upward movement of thel cylinder D-39 is arrested by the engage-ment of its upper end with the underside of the carriage D-13, and when the fluid pressure is relieved, the arm D-S is moved downward by its own weight.

The blade support may be oscillated to effeet the grinding operation by means of a link B-22 having a universal-joint 'connection at one end to a projection B-28 extending laterally from the sleeve B-2 and at its other end to a crank pin B-24 carried by a disk B--25 which is mounted on a counter-shaft B-26 located at the rear of the machine and journalled in fixed brackets B-27 secured to the base A, the counterhaft B-26 being provided with a driving pulley B-28 by means of which it is continuously rotated from any suitable source of power.

In order to provide for varying the amplitude of the oscillations of the sleeves B-2 and f B-4, the crank pin B-24 may be adjustably secured in a radial slot B-29 in the crank disk B-Q, in which case a change in the position of the pin B24 in the slot B-29 will change the eccentricity of the crank and consequently the throw of the link B-22.

The upper part of the blade support may be moved into loading and unloading position by means of a horizontal swinging arm B--3O located behind the blade support and pivoted at one end to a bracket B-31 secured to the base piece C-2L At its free end the arm B3O is pivoted to a curved link B-32 llaving a slot B-33 through which passes a pin B-34 carried by anarm B-S which is secured to the sleeve-1B-4, and between its ends the arm B-3O is connected by a link B-36 to one arm ofl a bell crank lever B--ST pivotally mounted on the base piece C2. The other arm of the bell crank lever B-S is connected to a pull lrod B-SS which extends upward to and is movable upwardly by the overhead operating mechanism previously referred to,fagainst the tension of a coiled spring B-39 which connects one arm of the bell crank lever B-37 and a point on the baie piece 0 2.' lfVhile the blade is being operated upon, fthe spring B-39 maintains the links B-BO and B--32 in the position shown in Fig. 4, the slot B-l being of such length that the pin B--M can more back and forth in it iwhile the sleeve B-l is osclllated by the rotating crank disk and linkage above described,*but when the pull rod B-38 is moved upward by the overhead mechanism, the link B--Sfi is drawn backward whereupon the link lie-32 moves freely until the front end of the slot B-Z reaches the pin B-34, thel sleeve B`-l then being moved to the position shown in Fig. 5. The blade holder is then" in the loading and unloading position, where the blade/is out of range of the action of the disk D. The movement takes place against the resistance of the spring B-, thus enabling the oscillations of' the sleeve B-2 to continue irrespective of the position of the sleeve-B-4. The loading and unloading position is determined by the adjustment of a suitable stop, such for example as the stop bolt 13,-40, Figs. 4 and 5, carried by the base piece (1 2, the front endof the bolt being engaged by the arm B- when it is pulled backward.

Adjustment of the stop bolt B7 has ythe effect of changing the point on the blade edge at which the abrading action of the disk D begins at the heel of the blade edge, the path of oscillation of the blade carrier being adjustable as to length or amplitude as described above exactly to cover the distance between the'v heel of the edge and its point.

The pressure of the abrading disk D on the blade may be determined by a weight consisting for example of a number of disks D-44 strung on a rod D-45 suspended on a hook D-46, Fig. 3, which is secured to the underside of the bearing D--3 with the lower end of the rod passing downward through a hole Ain the base A. By adding or subtracting disks the applied weight can be regulated as desired.

The. construction and timing of the overhead mechanism is such that after the blade support moves into the loading position shown in Fig. 5, the plunger C is lifted and thereupon the holding plate B9 is swung l upward by means ofthe spring B--15. j After a blade to be sharpened has been positioned" on the Aplate B-16 the plunger C `isrforced downward by means of the'parts C-4 and 0 3 actuated by the overhead mechanism through the pull rod C-G, causing the plate B-9 to clampthe blade on the blade support. The tension on the pull rod B-38 is released and it is drawn downward Aby the spring B-BS), and the blade support moves yinto the position shown inFig. 4, the abrading disk at this time being held out of-contact with the blade by the fiuid under pressure in the cylinder D-39. The fluid'pressureinthis cylinder is then exhausted, y,permitting the disk D to move downlinto Contact with the blade, and since this disk rotates continually and the blade support as a whole is oscillated continually, the abradin action begins as soon as lthe disk touches the lade and con- 'tinues until the bevel lhas been sufficiently operated upon. Fluid pressure is then ai mitted to the cylinderD-39 by the automatic mechanism and'lifts the disk D out of` ycontact 4with the blade, the blade 'support B-4 thenbeing swung into the loading and unloading position, Fig. 5, by the overhead@ mechanism operating through the pull rod B-38, the plunger C being lifted,`and the' vtop plate B-9 swinging upward. The blade is then removed and replaced by'another,

whereupon the cycle ofI operations isrepeat'ed.

It remamsto describe certain. effects of' various adjustments provided-for inthe con-l struction of the sharpening unit.` These effects will depend to some extent upon the transverse contourv ofthe periphery ofthe' wouldconform in curvature to the disk it,

self` and on a blade ofgiven thickness the width of the bevel would depend upon the curvature of the disk, 'assuming the action'jV of they disk to be limited tothe upper half of the blade. Anl increase in ithe diameter of the disk would result in a rbevel of increased width and radius of curvature, anda decrease vinthe di ameterof thedisk would resultlin a bevel of less width and radius of curva.

ture. If the plane of the disk were tilted with respect to the plane of theblade, with-vk out otherwise changing theirrelatlons, the

shape of the bevel would not begafi'ected, but the abrading action of vthe disk would be confined to one vof? its corners. o

On the other hand,'if theplane of the disk were perpendicular to the plane of the blade but parallel with the direction of the blade `edgeoat the point of contact, the disk would grind a rabbet at the edge of the blade, and in order to make it grind a bevel it would be necessary to tilt theplane of the disk with respect to the-.plane of the blade. Theangle 'andiwidth ofthe bevel thus produced would dependuponthe angle of tilt, but atalnyl i angle the' bevel lwould bev flat and not conthickness .of the disk.

the blade can be varied by adjusting the arm f D-8, angularly about `the axis ot the .pintle 'D-QO, and the angle between the disk and the direction ofthe blade edge at the point `o f contact can be adjusted by moving the car-` f rlage on the arc-shaped bracket D-34,both

of these adjustments being limited to a certain range'which suffices for all practical purposes, althoughthe range of movement of the carriage on the bracket D`34= is such that the disk nevercrosses the blade edge at a right angle thereto. In any such intermediate adjustment ofthe disk tilting is necessary 'to cause the whole width of thefcylindrical surface of the disk to bear on the blade. The

position of the abrading disk transversely withk respect to the edge of theblademay be varied by adjusting the arm D -S'with the susI slide member D`29 longitudinally along the slot `D---BO inthe carriage D-13. It follows from'the foregoing explanation that adjustf mentsot the carriage onthebracket D-34 serve'to varyfbothy the concavity andthe width of `the bevel on the blade, while ;a dj ustments of the disk about the axis dcterminedby the pintle D--2O serve primarily to distributethe wear over the entire periphery of the disk,

some extent by the. other. In practice the adjustment `ofl-the carriage is limited to a which range it is employed chiefly, to determinel the `width of the bevel, the cha-nge in ,the-fconcavity being relatively unimportant..` By suitably combining these adjustments alV bladebevel of anydesired contour, within certain limits,.may be readily produced. f

small range about the arc-shaped bracket inf' It' will be observed that the mechanismide-v scribed -iis adapted to sharpen one bevelV only,`

and in order to sharpen thecother bevel I eml ploy. asimilarimachine'with the partsof the in position inanjobvious manner, but otherwise exactly similar to the machine described.

While the` specific apparatus above described is designed for sharpening blades blade carrier. and. the abrading kunit reversed 1,20*

having curved ledges, it will be evident that f various features of the invention aref'applicable to'machines forlsharpening blades hav-,6.

construction and arrangementmay be widethe result of each adjustment being affted yq 105,

holder in the plane of the blade so as to bring every point of the edge to be sharpened into contact with the abrading disk, and adjustable means for limiting the movement of the disk towards the blade.

2. Ina blade sharpening machine, a circular abrading disk, means for oscillating a curved blade beneath a point in the periphery of the disk, a shaft on which said disk is' p mounted, an arm adjacent to one end of which'said shaft is mounted, a carriage supporting said arm, and an arcuate support having its center of curvature adjacent to the point of contact between the abrading disk and the blade around which center the carriage is movable, whereby to vary the angle between the plane of the abrading disk and the blade edge at their point of Contact and consequently to vary the width and degree of concavityof the bevel.

3. InV av machine for sharpening curvededge blades, an abrading disk adapted to be rotated with its plane at an acute angle to the blade edge at its pointof contact, a shaft on which said disk is fixed, an arm adjacent to one end of which said shaft is rotatably mounted, a support carrying said arm, a carriage upon which saidsupport is pivotally mounted, the axis of movement of said support being located adjacent to the point of contact between said disk and the blade, means for adjusting the position of said support relatively to said carriage, whereby to vary the angle between the plane of the blade and the plane of the disk, and anl arc-shaped support having its center of curvature adjacent tothe point of contact between the disk and the blade around which said carriage is adapted to be moved, whereby to vary the angle between the plane of the disk and the edge of the blade at the point of contact and consequently to vary the width and concavity of the bladebevel.

4. In aV blade sharpening machine, an abrading tool, a blade holder mounted for oscillatory movement, means for oscillating the holder, a movable blade clampingmember carried bysaid holder, and an operating member located outsidesaid holder and having a point bearing with said clamping member located in alignment 'with the axis of 0sunit in a predetermined path to effect the` grinding operation, and automatic mecha- ,rrsm for extending the movement of one part only ot the unit beyond its normal oscillation to carry the blade out of range of the abrading disk.

6. In blade shaponding machine, a rotary abrading disk, an oscillatory blade holder comprising a base part and a blade clamping part movable about the same axis. means connected to the base part for oscillating the holder as a unit, and separate mechanism connected to the blade clamping part for oscillating that part independently of the base art.

7 In a blade sharpening machine, a rotary abrading disk, an voscillatory blade holder for a curved edge blade, means for oscillatingfsaid holder in a predetermined path, and operating means having a lost motion connection with said holder while it moves in its normal path arranged to impart an additional further movement to the holder at predetermined intervals.

8. Inl a blade sharpening machine, a rotatable blade holder including 'a pivotally mounted sleeve and adjustable clamping means disposed at one end thereof, an abradtion adjacent said clamp, means for moving lone edge of said clamping means beyond the l range of the abrading disk and cooperating means or moving said disk away from said f blade holder to permit` adjustment of said clamp.

9. In a blade sharpening machine, a power operated holder for securing articles to be ground and movable therewith in a curved path, a vertically movable arm arranged above said article, an adjustable stop `for positioning the arm in a predetermined vertical position, a rotatable abrading disk at the free end of the arm and a fluid actuated device for raising said arm from said stop.

10. In a machine for sharpening curved blades the combination with a rotary abrading disk, of a blade holder, mechanically actuated means for oscillating the holder to present every point in the edge of a curved blade to the action of the disk, and: automatic means for periodically extending the movement of the holder beyond the normal lrange of its oscillating movement to locate it in loading or unloading position.

11. Ina machine for sharpenin curved edge blades, a rotary abrading dis a twopart oscillatory` blade holder cooperating therewith, power operated mechanism for oscillating the holder as a unit about its aXis I to grind a blade in the holder while leaving one part of the holder free for independent oscillation about the same axis, and means for independently oscillatingsaid part to carry the sharpened blade beyond the range of the abrading disk.

12. In a blade sharpening machine, a driv en abrading disk, means for oscillating a curved blade beneath the disk, a shaft carrying the disk, a pivotally mounted arm in the free end of which said shaft is mounted, a carriage supporting the arm and being bodily adjustable in an arcuate path having as its center of curvature the point of contact of the disk with the blade, and provision for bodily adjusting said arm and disk transversely with respect to the edge of the blade being sharpened.

Signed at Boston, Massachusetts, this twenty-third day of August, 1927.`

WILLIAM EMERY NICKERSON.

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