US1858297A - Abrading machine - Google Patents

Description

Patented May 17, 1932 warren euros;

WILEY FROMM, OF FRAE IKFORT-ON-THE-MAIN, GERMANY, ASSIGNO-R T-O- UNITED SHOE MACHINERY CORPORATION, 0F PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY ABRADING MACHINE Application filed May- 16, 1925, serialll o. 30,779} and in Gerniany'J'une 2", 1924'.

This invention relates to abrading machines and is herein illustrated as embodied in a machine for grinding the cutting edges of curved knives such, for example, as heel breasting knives which are used to shape the breasts ofthe heels of boots or shoes;

A heel or heel base of the type comprising plurality of heel lifts requires a breasting operating after it has been attached to the shoe. The breasting operation-is commonly performed by a knife the face of which is curved to impart the desired curvature to the heel breast, this curvature being usually in the form ofianarc of a circle. Inasmuch as the shank portion of a shoe sole, at its junction with the breast of the heel, may have either aflat or a convex outer surface, and since the'heelbreasting knife should cut the material of the heel down to the surface of the sole and not. beyond, the cutting edge of the breasting, knife should have a profile (when viewed from .theplane of symmetry of the knife in a. direction perpendicular to the surface of the knife) which corresponds to the transverse contour of the shank of the sole, the profile of the cutting edge being concave if the shank of the sole is transversely convex and being straight if the shank of the sole is flat. Furthermore,.heel breasting knives are sometimes made with one end or shank portion of the knife having the same transverse curvature as the. blade portion while in other cases the shank portions of curved heel breasting knives are flattened the better to adapt the knives to be clamped in place in the breasting machinev FV-ith the foregoing. in mind, one objectof the present invention is to provide an im proved abrading: machine wherein curved kinds of either of the types. referred-to may be readily positioned and advantageously operated upon. for the purposes of producing cutting edges having either curved or straight profiles.-

To the accomplishment of this object one feature of the invention consists in the provision, in a, machine for grinding curved knives of the type in which the cutting edge is transverse tothe axis of curvature ofthe knife blade, of a worr holder mounted for oscillation to traverse the work ajcro'ssth'e face of the grinding element and foradjustment into such a position relatively to: its axis of oscillation that; the cutting edge will I e ground When the-desiredci'irved profile or into such other position relatively to said axis that the cuttingfedge will be gronndwith a straight profile.

In the illustrated embo'dimentof th'is'f'eature of the invention the grinding element comprises a w-heel having a crowned periphcry and the work holder is' mounted for oscillation about an' at right" angles to the axis of'rotationof the grinding wheel and for tilting or angular adjustment; into either a position wherein the knife blade is parallel to the axis of oscillation of the work holder for the grinding of afcutting'edge having a straight profile, or into suchother position that the knife blade will beinclined with respect to said axis forthe grinding of cutting edge havingthe idesired curved profile.

It is desirable that the edges of knive-sof this type have a substantially uniform bevel throughout their width and another feature of the inventioirconsists in providing adj ustinents sot-hatthe axis of oscillation of the knife during grinding may be positioned to coincide With the center of curvature of the knife-edge by which means this'dosired re suit is attained, whether the profile of" the edge be straight or curved.

Another feature of" the invention consists in providing, in a machine fitted for grinding such substantially uniform bevel, means for adj usti theangle of-thei bevel;

Further to facilitateeifectively supporting in operative position knife blades having either flat or transversely curved end. or

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shank portions, another feature of the invention consists in the provision, for use in an abrading machine, of an improved work holder constructed and arranged to engage separated areas on opposite sides of the shank portion of the knife in such a manner that blades having flat or curved shank portions may be supported with equal facility and without any perceptible distortion of the shape of either type of knife.

A further feature of the invention consists in the provision of a novel fixture for the purpose of centralizing the knife blades transversely with respect to the work engaging portions of the work holder.

It will be understood that the invention, which is herein illustrated being embodied in a machine for operating upon heel breasting knives, is in no respect limited to the particular type of work to be operated upon other than may be determined from the scope of the appended claims.

The invention is more fully described in the following specification and shown in the accompanying drawings, in which:

Fig. 1 is a side elevational view of a grinrling machine constructed in accordance with the present invention and shows the worl holder in a vertical position supporting a heel breasting knife of the type having a curved end or shank portion;

Fig. 2 is a side elevational view of the device shown in Fig. 1 with the work holder shown in tilted position relatively to the grinding element and supporting a blade of the type having a fiat end or shank portion;

Fig. 3 is a top plan view of the device shown in Fig. 1 and illustrates the construction of the work holder and its adaptation to a blade having a curved shank portion; and

Fig. 4 is an enlarged plan View of the work holder showing it supporting a blade having a flat shank portion, and showing also the fixture for centralizing the blade relatively to the clamping means.

As shown in the drawings, the machine comprises a work holder 2 adapted to support a heel breasting knife 4 for movement across the crowned peripheral face of a grinding wheel 6 and for presentation to the face of the wheel in a tilted position, as shown in Fig. 2, for the grinding of acutting edge of concave profile, or in a vertical or upright position, as shown in Fig. l, for the grinding of a cutting edge of straight profile. The work holder fiat ends or shank portions without producing any perceptible distortion of the shape.

of either type of knife. To this end, a yoke or body member is rigidly secured to the upper extremity of a supporting rod .28 and is formed with two cylindrical bearing mem- 2 is designed and I constructed to support with equal facility knives having either transversely curved or bers 36 extending from its opposite sides, the yoke 30 carrying, between the bearing members, two fixedly positioned cylindrical clamping extensions 82. The extensions 32 are symmetrically disposed with respect to the median plane AB of the work holder, as shown in Fig. 4. (The term median plane as used herein is intended to indicate a vertical plane passing through the holder equidistant from the extensions 32). Mounted within the bearing members 36 are headed pins 84, each being rigidly secured at one extremity thereof to a bridge or span member 88 carrying a set-screw 40. On the side of the bearings 36 opposite the bridge member 38 a second yoke 42 is slidably mounted to carry pivotally two additional cylindrical clamping extensions 48. The yoke 42 is slidably mounted on the pins 34 .and is normally held in engagement with the heads 44 of the pins by means of springs 46. The set-screw may be turned to produce relative movement between the rigidly mounted clamping extensions 32 and the pivotally mounted clamping extensions 48 to clamp and hold in supported position a blade whose shank has been inserted between them. By arranging the clamping extensions in such a manner that clamping pressure is equally applied upon separated areas similarly located on the opposite sides of the shank portion of the knife and symmetrically disposed with respect to the longitudinal center line of the knife, it will be seen by an inspection of Figs. 3 and 4, that there will be no perceptible tendency on the part of the clamping members to distort the shape of any knife clamped thereby, whether its shank be curved or straight.

For the purpose of providing means to centralize a knife with respect to the work engaging portions 32 and 48 of the work holder, the yoke 30 isprovided with a ridge 52 which extends coincidentally wi h the vertical median plane of the holder and upon which ridge a fixture 50 is adapted to be positioned. The fixture 50 is formed with a channel or groove corresponding to and adapted to receive the ridge 52 of the yoke 30. The fixture 50 has formed upon it, symmetrically positioned with respect to the groove or channel, two downwardly extending arms 54 for centralizing a knife transversely with respect to the clamping members 32 and 48, as shown in Fig.4.

As hereinbefore pointed out, the device is designed to operate on a supported blade to impart thereto a cutting edge of either straight or concave profile, and to the accomplishment of this object the work holder 2 is mounted relatively to the grinding wheel 6 in the following manner: The extremity of the supporting bar 28 opposite the work holder is non-rotatably mounted within asleeve 26 to permit longitudinal sliding adjustm'ent, the extent of adjustment being'con trolled by ahand wheel 2 5. The sleeve- 26- 1s tiltably supported at I8 upon a gagebar 12 for movement into a plurality of positions, as shown by Figs. I and 2 and the positioning of the sleeve member 26 is controlled by a spring pressed plunger 20 carried by the sleeve and adapted for removable enmge ment with oneoif a plurality of apertures or depressions, such as 2 2", 24 formed in a downwardly extending, rig-id arm 27' carried by the gage bar 1 2. Since a cutting edge having a straight profile will be imparted to the blade-when it is presented to'the grinding element in a vertical position, and a cutting edge having curved profile wilt be imparted when thebladeis presented in a til-ted position, as will be later explained, the single tilt-able adjustment is efle'ctive to determine and control the shape of the cutting ed'geimparted to-the bladeduring the grinding operation.

The gage bar 1 2' has marl'i-ings 1 6 formed on its surface to be used, in co-operation with a face 15 of a clamping head 14, as a gage in determining the magnitude of the radius of oscillation of the work hol der about a vertical axis 8, the face of the clamping head being located to coincide with the vertical axis of oscillation. The work holder is mounted to oscillate about a pin' S coaxial with the axis 8=carricd by the clamping head 14 and ournaled within a bearing member 11 located within the central plane of the rotary grinding element 6 (i. e'., within aplane disposed at right angles to: the rotary axis of the grinding element and equidistant from the opposed side faces of the dismal grinding element) for longitudinal adjustment within the guideway 1 0.

In operation, when it is desired to'impart a cutting edge having a straight profile to the blade, the holder is positioned as shown in 1' in which the cutting edge of the blade 4' forms a. portion 01 an arc of a circle in a horizontal plane whose center is located in the central plane of the grinding element. Furthermore, the parts are soadjusted that the centerof'said arcis made substantially to coincide with the axis of oscil ation of the holder. This adjustment is efiected by the proper longitudinal positioning of the gage bar 12 in the clamping head 14, to bring the center of curvature of the knife edge into the axis 8, and by thelongi-tudinal positioning of the bearing member 11 in the guideway 10 to bring. the knife to the face of the grinding element 6. The upright blade may then. be oscillated a rose the face of. the grinding element to produce a cutting edge of straight profile and of'uniformbevel Th-isis because the knife edge always remains in a vertical circular cylinder about the. axis 8, and: the grinding element 6' will intersect this' cylinder always at the same height, cutting itin a horizontal circle. This circle, when viewed perpendicularly to the surface of the: blade; will projectinto a straight line, thus a straight profile, according to the termitnology herein used. hen it is desired to impart a concave cutting edge to the" sup ported blade, the holder is moved intothe position shown inl i g. 2"- tohold the Inn-rte tilted toward the grinding element 6 (i. e., with the axis of? curvatitr'e' of the bladeat an angle tothe axis of oscillation), the adjustments 81-0 1*2'*14, being made to bring the axis 8 to the center out curvature ot the said cutting edge; The cutting edge will be a horizontal circle for the same reason" asbetore, but the plane ot the circle wilh be now oblique to thelongitudinal axis (or the axis ot'cuiva-ture) of the blade and the edgewill appear curvedwhen viewed perpendicularly to-the surface ot the bl'a'd eand will have what is herein termed a curved profile.

It is a ppa-rent'that, When-the'worlt holder is adfi ustecl relatively to the grinding element insuchamanner that the axis oil oscillation of the holder coincides with the center or th'c circle ot which the cuttingedge oi the blade forms an are (as above described-) whether the holder is adjusted to grindbladeswith straight or curved profiles, the grinding operation will produce acutting edge having a substantially uniform bevell- It will be seenthat by varying the position of the work holder within: the sleeve 26 by means of hand wheel the" cutting edge of the knife will he presented to various points along the periphery ot the grinding elementto vary the angle of bevel produced by the grinding operation.

Having thusdescribed my invention, what I claim a s-new and desire to-se'cu-re by Letters Patent of'the'hlnited States is':

1.- In adevice of the class described, the combination with an abrading element, of a work holder mounted for oscillation about an" axis lying in the plane of movement of the abrading' element to traverse a. blade, having a transversecurvature, across the face of the abrading element and for adjustment in said plane into'oneangular'position r'clatively'to'its axis of oscillation for the grinding of a cutting'edge having a curved profile and into another angular position in said plane relatively to'said' axis for the grinding of a cutting edge having a straight profile.

2. In ad'evice of the class described, the combination with a grinding Wheel, of a work holder adapted tohold" a knife blade having atransverse curvature, said work holder being mounted for oscillation about an axis" at right angles to the" aX-isof rotationof the grinding wheel and for tilting adjustment'into one position wherein-the axis of curvature otthe' knife blade is parallel with respect to the axis (if-oscillation ct the work holder for the grindingot a cutting" edge having a straight profile and into another position wherein the knife blade is positioned with its axis of curvature'inclined with respect to said axis of oscillation for the grinding of a cutting edge having a curved profile. v

3. In an abrading machine, a grinding element, a work holder adapted to hold a curved knife blade having a cutting edge transverse to its axis of curvature, said work holder being arranged to be oscillated about an axis of oscillation and being mounted for tilting adjustment, relative to the axis of oscillation, into any one of a plurality of positions and for oscillation in any of said positions across the face of the grinding element, and means to vary the axis of oscillation to cause it to coincide with the axis of curvature of the cutting edge, whereby the cutting edge of the knife will be ground with substantially a uniform bevel.

I. In an abrading machine, a grinding element, a work holder arranged to be oscillated about an axis of oscillation, said work holder being mounted for tilting adjustment, relative to the axis of oscillation, into any one of a plurality of positions and for oscillation in any of said positions across the face of the grinding element, means to vary the radius of oscillation, and a gage for determining the radius of oscillation.

5. In an abrading machine for operating on blades having a transverse curvature, a grinding wheel, a blade holder movable about an axis in the plane of the wheel to carry a blade across a face of the grinding wheel in a grinding operation, said blade holder being adjustable angularly in said plane, relatively to said axis, whereby movement of the holder will impart either a straight or curved cutting edge to the blade during the grinding operation, and means to vary and control,

the angle of bevel produced by the grinding operation.

6. In a machine for operating upon an elongated cutter blade having a transverse curvature and with a cutting edge formed at one extremity of the blade, a grinding element, means to move the blade relatively to the grinding element about an axis of oscillation with the longitudinal axis of the blade parallel to the axis of oscillation for the grinding of a straight cutting edge, and means to present the blade to the grinding element with the longitudinal axis of the blade at an angle to the axis of oscillation for the grinding of a curved cutting edge.

7. In an abrading machine for operating on blades having a transverse curvature, an abrading element, a pivot located within the central plane of the grinding element, a work holder mounted for oscillation about said pivot, and means to permit angular variation of the work holder relatively to said pivot whereby a cutting edge with a profile that is either straight or that has a predetermined curvature may be produced.

8. In an abrading machine, a work holder comprising relatively movable members adapted to clamp and support knives having either fiat or curved shank portions without causing distortion of the shape of either type of knife.

9. In an abrading machine, a work holder to the median plane of the holder and symmetrical with respect thereto, and a movable clamping piece arranged for movement relatively to the curved extensions tocooperate an axis of oscillation and being mounted for tilting adjustment, relative to the axis of oscillation, into any one of a plurality of positions and for oscillation in any of said positions across the face of the grinding element r97 to grind a substantially uniform bevel on the I knife, and means for varying the angle of said bevel.

11. In an abrading machine, a work holding device comprising clamping members;}

adapted to contact with the opposite sides of the work at separated areas, and a fixture cooperating with the clamping members for centering the work with respect to the median plane of the holder prior to applying the clamping pressure.

12. In an abrading machine, a work holder for cutting blades having, in combination, a plurality of work clamping members, and a fixture adapted to be supported by one of; the clamping members to cooperate therewith in centering a blade within the holder.

13. In an abrading machine, a holder for cutting blades comprising a pivotally mounted member having a plurality of roundedextensions for engagement with one side of the blade, a member having a plurality of fixedly positioned rounded extensions mounted thereon for cooperative engagement with the opposite side of the blade and means for moving said members toward each other to clamp and support the blade within the holder.

14. In an abrading machine, a grinding 1g element, a bar mounted for oscillation about" a pivot lying within the central plane of the grinder, a sleeve supported by the bar, a work holder mounted within the sleeve, and means comprising two curved work-engaging extensions positioned in a plane perpendicular with said extensions for supporting and holder being arranged to be oscillated about 2 to vary the position of the work holder with-,

in the sleeve to vary the angle of bevel produced by the grinding operation.

15. In an abrading machine, a grinding element, a bar mounted for oscillation about a pivot adjustable Within the central plane of the grinding element, a sleeve supported by the bar, a work holder mounted Within the sleeve, means to tilt the sleeve about the bar to vary the angle of presentation of the supported Work to the grinding element, and means to vary the position of the Work holder Within the sleeve to vary the angle of bevel produced by the abrading operation.

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

WILLY FROMM.

GERTIFIGATE 0F CORREG'HON.

Patent No. 1,858,297. May 17, 1932.

WiLLY FROMM.

it is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1, line 40, for "kinds" read "knives", and iine 55, for "when" read "with"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 23rd day of May, A. D. 1933.

M. J. Moore.

(Seal) Acting Commissioner of Patents.

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