US1744766A - Grinding machine - Google Patents

Description

Jan. 28, 1930.

GRINDING MACHINE H. LQ HOOD 1,744,766

Filed Oct. 18, 1926 Fig. 2.

' of theA heel.

Patented Jan. 28, 1930 UNITED STA-TES PATENT OFFICE HARRY L. HOOD, 0F EAST LYNN, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MA- CHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY GRINDING MACHINE Application led october 18, 1926. Serial No. 142,364.

rlhis invention relates to abrading machines and is herein illustrated as embodied in a machine for use in grinding the cutting edges of substantially flat, rectangular knives, such, for example, as knives adapted foruse in practicing the method disclosed in United States Letters Patent No; 1,527,963, granted February 24, 1,925, upon application of J. L. Preo andIsabelleHenne.

In accordance With the method disclosed in said Letters Patent', al soled shoe, to which a Wooden Louis or similar heel is to be attached, is supported in an inverted position While a knife having acutting edge disposed at a slight angle to the plane of the bottom of the' sole is pushed through the material of the sole in a direction transverse to the length thereof, in the vicinity of'V the heel breast line. The eut thus formedis not of sufficient jdepth to extend completelythrough thesolebut serves to-form a flap orI tongue Which is of substantial thicknessatl its root or base and overlies the overhanging'portion' of the heel breast adjacent to the attaching face This tongue is secured to the overhanging portion of the breast of the heel after the latter is attached and thus provides-an anchorage for that part of the heel.

One type of knife which maybe advantageously used in forming the above described tongue or flap is thinV and oblong, having one side plane andflat and the other side somewhat convex transversely of its length. The cutting edge of a knife of this type is generally disposed along one' of the narrower sides and is formed by the inter-v section with the convex side of the knife of a beveled surface formed on the plane flat side of the knife.

W 1th the foregoing considerationsl in View, theV present invention has for an object thereof the provisionof'an abrading machine'for use in producing or reproducing 'beveled' surfaces upon the plane*flat SidesOfknivesfof the character described, which surfaces Will intersect with the convex sides ofthe knives to form upon each knife a desired cutting edge.- p

In the illustratedembodiment of' the in.-

vention a grinding Wheel is mounted for rotation upon the rotor shaft of a motor and a Work holder is mounted adjacent to the grinding Wheel in such a manner that a blade supported in the holder may be traversed across the peripheral face of the Wheel during the abrading operation, thereby enabling the grinding action to take place progressively along the entire length of the cutting edge.

Inasmuch as the material of Whichthe blade is composed, as Well as the abrasive material comprising the grinding Wheel, becomes slightly Worn during the abrading operation, it is desirable in machines of this character, to provide means kfor producing relative approach or recession between the Work holder and grinding Wheel, and it is further desirable that the arrangement be such that' the supported knife may be fed with facility in the direction of the grinding Wheel While the actual grinding operation is being' performed upon the blade.

Accordingly, an important novel feature of the invention resides in the provision of an eccentric feeding arrangement for the work holder, which may be actuated With equal facility'during the course of the a-brading operation or preparatory thereto. In the illustrated embodiment of the invention the work holder is mounted upon a carrier which is, in turn, mounted for oscillation about an eccentric stud. An arm and-an operating lever are connected Wit-h the stud in such a manner that movement of theV lever results in actuation of the stud and movement of the carrier and Work holder toward or away from the grinding Wheel.

In the use of the illustratedmachine, the knife isgenerally supported vertically in the Work holder and oscillated horizontally across the peripheral face of the grinding Wheel, thereby producing'a cutting edge lying at right angles to the side edges and to the longitudinal axis of the blade. Such a cutting ed e isentirely satisfactory in all instances, ut in thesingle event that the groundknife is to be' so used in cutting materials that it must move in the direction of .its length, into engagement with, and through, the materials, the cut, vWhile satisfactory, will be a thrusting one which will cause the cutting edge to dull more rapidly than it would if a slicing cut were effected by an oblique disposal of the cutting edge. In view of this fact a further feature of the invention consists in mounting the work holder in such a manner that it may be moved into either of two positions in one of which a flat cutting edge lying at right angles to the side edges of the blade is produced by the abrading operation and in the other of which a cutting edge obliquely disposed with respect to the side edges of the blade is produced. ln the hereindescribed embodiment of the invention this result is accomplished by mounting the work holder in such a manner that it may be tilted about an axis extending at right angles to the axis of oscillation of the carrier and substantially in alinernent with the grinding wheel.

Although the invention has been described in its application to a machine for grinding knives for use in practicing the method set forth in said Letters Patent, in various aspects it is not limited to use in grinding knives of that type nor to embodiment in abrading machines of the character illustrated but may be employed in analogous organizations and be useful in performing similar abrading operations.

These and other features and advantages of the invention will appear from a consideration of the following description read in connection with the accompanying drawings and will bevpointed out in the claims.

Referring to the drawings,

Fig. 1 is a view in side elevation of a grinding machine embodying the invention, the illustrated machine having parts broken away more clearly to illustrate certain features of construction;

Fig. 2 is a view in front elevation of the grinding machine;

Fig. 3 is a fragmentary view in perspective showing the manner in which the work holder is mounted;

Fig. 4 is a fragmentary view in front elevation showing the manner in which the work holder may be adjusted;

Fig. 5 shows, in perspective, a knife of the type which the illustrated embodiment of the invention is especially designed to grind;

Fig. 6 is a view in front elevation of a blade having its cutting edge disposed obliquely to the side edges of the knife; and

Fig. 7 is a view similar to Fig. 6 showing the cutting edge disposed at right angles to to the side edges of the knife.

Referring' to the drawings, the numeral l0 indicates a frame for supporting a motor 12 upon the rotor shaft of which is mounted a relatively thin grinding wheel 13. A casing 14 is arranged to enclose a substantial portion of the grinding wheel and serves as a guard to prevent the hands or clothing of the operative from contacting with that portion of the rotating wheel, as well as a baille to minimize the danger of injury resulting from flying particles of metal or abrasive produced by the abrading operation.

The illustrated grinding machine is provided with a base upon which is mounted an oscillatory carrier for supporting a blade or work holder in such a manner that the latter may be oscillated, with the carrier, across the peripheral face of the grinding wheel. rhe base is indicated at 1G and is lsecured to an arm 18 (which extends laterally from the base of the frame for adjustment along two directions lying at right angles to each other. As illustrated, a slot 20 formed in the arm 18 and a locking bolt 22 permit adjustmentof the base 16 in a direction parallel to the axis of the grinding wheel 13, and a slot 26 (Fig. 3) and bolt 24 allow adjustment of the base in a direction at right angles to the axis of the wheel.

rlChe carrier for supportingthe work holder is indicated at 28 and is mounted for oscillation across the top surface of the base 16 about a stud 48 the axis of which lies to the rear of the grinding wheel 13 in a plane at right angles to the axis of the grinding wheel. The purpose of mounting the carrier for oscillation in this fashion and the benefits that result therefrom will be hereinafter more fully explained.

The carrier 28 has formed at its forward extremity an upwardly extending wall 30 which is arcuately grooved at 32 to receive a correspondingly shaped ridge formed at the bottom of a work holder 34. The illustrated work holder is provided with a vertically extending slot 36 into which are adapted to be fitted pins 4a- (Figs. 5, 6 and 7) formed on the front face of a knife 45 which is thin and oblong, having one side plane and the other convex transversely of its length. Knives of this character are used in forming a tongue or flap along the heel breast line of an outsole, in accordance with the practice of the method disclosed in said Letters Patent. The pins 44 lie at equal perpendicular distances from one of either of the parallel side edges of the blade l5 and it will y therefore be appreciated that if the pins are inserted in the slot 36 when the latter is vertically disposed as shown in Fig. 2, the side edges of the blade will also extend vertically and parallel to the side faces of the grinding wheel. Vith the blade or knife so positioned, horizontal oscillation of the holder and blade across the face of the grinding wheel will result in the formation of a cutting edge lying at right angles to the side edges of the blade.

It may, however, be desirable (as hereinbefore stated), to produce upon the blade a. cutting edge lying obliquely to the side edges of the blade (Fig. 6), and to this end 15T/aeree the work holder 34 is mounted, by of the groove 32 formed in the carrier `28 and the ridge formed on the holder, in such a manner that it may be tilted relatively to the carrier, about an axis lying at right angles to the axis of oscillation of the carrier and substantially in alinement with thegrinding wheel 13, as shown in Figs. 2 and 4. A slot 2,5 located inthe base of the work holder 34 cooperates with a bolt 46 in locking the work holder in a desired tilted position. It will be appreciated that horizontal oscillation of the tilted blade across the face of the grinding wheel 3 will result in the production of an oblique cutting edge such as that illustrated in Fig. 6.

To cooperate with the slot 36 in holding the knife 45 within the work holder, the latter is provided with anarm .40 tapped to receive a set screw 42 which may bc moved into clamping engagement with the knife. An adjustable abutment 38 is located adjacent to the bottom of the `slot 36 and serves to regulate the depth to which the knife 45 may be inserted within the'holder. By virtue of being able to adjust the heightwise position of the knife relatively to the grinding wheel 13, cutting edges of various angular bevels may be imparted to the blade; it being understood that if the blade be presented to the grinding Wheel at a. locality on the periphery thereof in the same horizontal plane with the axis of rotation of the grinder that a bevel of greater width will be produced than if the blade be presented to the grinder at a. locality upon the periphery lower than the irst-named locality.

Inasmuch as the knife45 is wider than the crowned peripheral face of the grinding wheel 13, it is necessa-ry, in order to grind a cutting edge entirely across the width of .the blade, that the blade be traversed across the face of the grinding wheel or, on the other hand, that the grinding wheel be traversed along the cutting edge of the blade. In the illustrated embodiment of the invention the blade is moved relatively to the grinding wheel and is moved in a curved path (by virtue of mounting the carrier 28 for oscillation) instead of in a straight line path. This latter feature is necessary owing to the convex character of the side of the blade upon which the cutting edge is formed. If the blade were moved in a straight line across the face of the grinding wheel, the cutting edge produced would be curved, the median portion of the cutting edge projecting beyond the end portions. It is generally desirable, however, to impart to the blade a flat cutting edge, lying within a plane positioned at right angles to the aXis of curvature of the cylindrical surface of the blade or lying at a small angle to such a plane. Accordingly the work holder is mounted for oscillation about a radius equal to the radius of curvature of the rear surface of the supported blade.

Movement of the bladeiinvthis manner results in `the production of a cutting .edge lying within a single vplane and appearing 4as :a straight line when lprojected asin Figs. 6 and 7 upon a plane tangent'to theconveX .Sur-face of the blade, f

As already pointed out,the slot 26am-d bolt 24constitu-te means y.to permit adjustment of the workholder 34 towards .orlaway :tromfthe grinding wheel s13. In .addition vto .the fore.- going featureof adjustment, the machine is also provided withnove'l means for .feeding or adjusting the work holder towards or away from the grinding .wheel, and this provision isfsuch that ,the holder may Vbe moved with facilityfduringthe grinding.operationfto com.- pensate for the wearing.y away .o fithe .f abrading material comprisingthe wheelforthe .fm aterial of which the blad-.e ismade. As illustrated, the stud 48 .about which the carrier'28 .oscillates is formedwith a shoulder :portion 66eccentric with .respect 'to `the body vportion 68 of the stud and which is encircled by an ec.- centric stra-p 67 formed fat .one end :of .the carrier. `The Vbody 68 of the stud .extends through and beyond vthe endof a bearing formed at one end 4.of the V*base 16, and to )the projecting Iend :of lthe Y.body :is .rigidly con.- nected a lever armt). .Anoperating rod 52 extends from the arm 5.0 :and passes .through a downwardly projecting, forward yportionbf the .base 16. rllhe forward .end .of the yrod .52 isscrew threaded to reeeivea handed, .-ratata-v ble operating .nut 54. "Thus, end-wise move.- ment of the .rod 52 lresults .in .rotation .being imparted to `the stud .48, thereby .causing the carrier 28 `and .work elmglder34 Ito approach or t0 reoedef-rom thegrifndinguwheel 13. Toin-l sure that .the operating rod 52 will move rearwardly, .when .penm-itted to do so ',-by .rota-` tion .of the nut 54, fa compressi-on spring 56 encircles the .rod and, Vas herein illustrated, abuts at one extremity againsta cotter pinj58 positioned ina lhole in t-lie1rod152fand at its opposite extremity vag.ains ,;t the downwardly depending portion of the vbase 1G. l

Having thus described my invention, what I- clainras .new Eand desire itesecurefby Letters Patent of the UnitedStates is:

ll. A machine .of the character described having, in combination, a .grinding wheel, a work holder .mounted foroscillatigon across theperipheral face cf the .grinding wheel, and means .comprising an :eccentric and .eccentric strap connected .to the :work holder @for pro.- ducing relative movement between the work holder and the grinding wheel in a .direction to causethe `workfholderfto:approach orto recede from the .grinding wheel.

2. A grinding machine o-ffthe'characterrdescribed having, in combination, a lgrinding wheel, a supporting "base, ra .carrier mounted for oscillation relatively to .the supporting base, a work'holder mountedupon.thefearrien and means `comprising an .eccentric and :eo-

centric strap and connections therefrom to the Work holder for moving the Work holder toward or away from the grinding Wheel.

3. In a grinding machine, a grinding Wheel, a Work holder, and means for moving the work holder toward or away from the grinding wheel, said means comprising an eccentric, an eccentric strap encircling the eccentric and connected to the Work holder, an arm secured to the eccentric, and an operating member secured to said arm movable to rock the arm and thereby to rotate the ec-` centric.

4. In a grinding machine, a grinding Wheel, a Work holder, means for moving the work holder toward or away from the grinding Wheel, said means comprising an eccentric and eccentric strap, connections therefrom to the Work holder, an arm secured to the eccentric, and an operating member secured to said arm, and yielding means tending normally to move said operating member in one direction.

5. In a grinding machine, a grinding Wheel, a carrier, a ivorlrholcler mounted upon said carrier and means for moving said carrier to effect relative approach or recession between said Work holder and said grinding Wheel, said means comprising an eccentric and eccentric strap connected to the carrier, an arm connected to said eccentric and extending laterally therefrom, a rod connected to said arm, and means mounted upon said rod for giving the rod endwise movement to rock said arm and thereby to rotate the eccentric.

6. A machine of the character described having, in combination, a grinding Wheel, a supporting base mounted for adjustment relatively to the grinding Wheel, a carrier supported by said base for oscillation transversely of the peripheral face of the grinding wheel. an eccentric, an eccentric strap encircling the eccent ic and connected to said carrier, said eccentric being arranged for actuation to produce movement of said carrier relatively to said supporting base, and a Work holder mounted upon said carrier.

7. A grinding machine of the character described having, in combination, a grinding wheel, a carrier mounted to oscillate transversely of the peripheral face of the Wheel, a vertically extending Work holder supported solely by said carrier and mounted for adjustment relatively to the carrier about a horizonal axis extending at right angles to the axis of oscillation of the carrier and substantially in .alinement With the grinding Wheel.

8. A grinding machine of the character described having, in combination, a grinding Wheel, a carrier mounted for oscillation relatively to the grinding Wheel about an axis at the rear of the grinding Wheel, a Work holder mounted upon the carrier in front of the grinding Wheel for tilting adjustment about an axis extending at right angles tothe axis of oscillation of the carrier and extending also in substantial alinement with the grinding Wheel.

9. In a grinding machine of the character described, a grinding wheel, a carrier mounted for oscillation relatively to the grinding Wheel about an axis at the rear of the grinding Wheel, a Work holder mounted upon the carrier in front of the grinding Wheel for movement into either of two positions, in one of which a supported blade will be presented to the grinding Wheel With its longitudinal raxis lying at a right angle to the axis of the grinding Wheel and in the other of which the longitudinal axis of the blade will be obliquely disposed with respect to the axis of the grinding Wheel.

I0. A machine of the character described comprising, in combination, a grinding Wheel, a carrier mounted for oscillation about an axis at the rear of the Wheel and lying in a plane extending at right angles to the axis of the grinding Wheel, and a Work holder mounted upon said carrier in front of the Wheel for tilting adjustment about an axis extending at right angles to the axis of oscillation of the carrier, said Work holder being provided with a slot running throughout its length to receive projecting portions of the Work-pieces to be ground, and means for maintaining a cutting knife Within the holder.

1l. A grinding machine of the character described having, in combination, a grinding VWheel, a base for supporting an oscillatory carrier, a Work holder mountedrupon said carrier for movement across the periphery of the grinding Wheel, and a connection extending between said supporting base and said carrier comprising a stud having a shoulder portion arranged to be encompassed by one extremity of said carrier, and a body portion with respect to which said shoulder portion is eccentric', said body portion being encompassed by one extremity of said supporting base.

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

HARRY L. HOOD.

Images