US2277373A - Grinding machine - Google Patents

Description

March 24', 1942. H. E. SOMES GRINDING MACHINE Filed April 8, 1939 6 Sheets-Shag; 1

INVENTOR- Howarrll'omas BY 4 I 1 ATTORNEY H. E. SOMES GRINDING MACHINE March 24, 1942. 2,277,373

Filed April 8, 1939 6 Sheets-Sheet 2 INVENTOR: flowardfi', James 4 wvmw ATTORNEY H; E. SOMES 2,277,373

GRINDING MACHINE March 24, 1942.

Filed April 8, 1959 6 Sheets-Sheet 4 INVENTOR- lfawardfi', James March 24, 1942. H. E. soMEs GRINDING MACHINE Filed April 8, 1939 6 Sheets-Sheet 5 INVENTOR:

flames BY 3 Q I ATTORNEY March 24, 1942. s s 2,277,373

GRINDING MACHINE Filed April 8, 1939 6 Sheets-Sheet e' INVENTOR:

ffowardj. 50272 5 BY W Q ATTORNEY Patented Mar. 24, 1942 2,277,373 GRINDING MACHINE Howard E. Somcs, Grosse Pointe Park, Mich., assignor to Budd Induction \Heating, Inc., Philadelphia, Pa., a corporation of Michigan Application April 8, 1939, Serial No. 266,912

18 Claims.

This invention relates to continuous stock cutting or grinding machines and more particularly to a machine and method of producing thin segmental cross sectioned strip stock from thin parallel surfaced strip stock. The machine has been particularly developed for use in shaping thin iron laminations for transformers in which the core is in the form of an'annulus and the individual laminatlons are in the form of thin sectors in order that a maximum cross section of iron may be built into an annular transformer core with a minimum of waste space.

In constructing a transformer core of the annular type in which the individual laminations thereof extend axially and lie substantially in radial planes, it is extremely advantageous'in order to obtain maximum cross section of iron in the core to have the laminations cut to a wedge shape, that is thicker along one edge than the other and in the form of a thin sector so that a set of laminations fit together and form a'f continuous annulus with no practical loss of space due to the poor fitting Qt the adja ciples are required, such as, for example, commutator segment bars. Because of non-uniformity of thickness of strip stock and because of the expensive nature of high-grade transformer iron as well as the cost of grinding or cutting away extra material, should the strip stock increase in thickness and the cutting head he designed for cutting a thick shape, the present invention has provision for automatically grinding a segmental shape based upon the thickness of the stock at the point of cutting so that with increases or decreases in thickness of the strip stock segments an increased or decreased number of degrees are automatically out, avoiding unnecessary waste. It will be understood that in constructing an annular transformer core, variations in thickness of the various laminations are of no consequence, it merely being essential that the laminations in assembled relation fill completelythe space provided for such laminations and thus it is merely necessary to make each lamination a true segment of the annulus or circular core in which it is to become a part. To this end accurate cutting and main- Another object of the invention is to provide a grinding or cutting machine capable of cutting strip stock to provide surfaces at such an angle with respect to one another as to produce strip stock of a sector cross section and such that the sector cross section of the stock may'have a uniform inner radius regardless of the angle between the surfaces.

A further object of the invention is to provide a grinding or cutting machine capable of finishing the surfaces of strip stock accurately and at an angle to One another to provide sector cross section strip stock.

A still further object of the invention is to provide a machine adapted to treat double width strip stTJ'ck byigrinding or cutting the stock thinner at its edges and leaving the center sunstantially its prior thickness whereby a double' sector section is substantially simultaneously produced.

Yet another object of the invention is to provide in conjunction with such a grinding or cutting machine a mechanism for absolutely main-- taining the cutting tool thereof true. A still further object of the invention is to 'provide a cutting machine adapted to cut flat strip having parallel faces into segmental strip regardless of whether or not one edge of the segment coincides with the axis of the circle to which the segment relates.

Still further objects of the invention relate to the simplicity of a machine for treating such strip stock as well as the method of compensating for varying thicknesses of strip stock so as to eliminate unnecessary waste of stock due to varying thickness and due to unnecessary cutting.

The above and other objects and novel features of the invention will appear more fully hereinafter from the following detailed description when taken in conjunction with the accompanying drawings. It is expressly understood, however, that the drawings are employed for purposes of illustration only and are not designed as a definition of the limits of the invention," reference being had for this purpose to the ap-- pended claims.

In the drawings wherein like reference numerals indicate like parts:

Fig. 1 is a side elevation of the complete machine for cutting strip stock.

Fig. 2 is an end elevation of the left-hand upper cutting head of Fig. 1 taken partly in section.

Fig. 3 is a top plan view of the cutting head of Fig. 2.

Fig. 4 is a side view partly in section of the- Fig. 12 is a part section taken on line I2l2 of Fig. 1 illustrating a grinding head for producing a plane bottom surface on. the strip.

Fig..13 is the side elevation of a modified form of grinding or cutting head.

'Fig. 14 is an end view of a modification of Fig. 13.

Fig. 15 illustrates in detail a feature of the modification of Figs. 13 and 14.

Fig. 16 is a section taken on the line iii-l6 of Fig. 15.

Fig. 17 is a detail view of the wear compensating mechanism of the modification of Figs. 13 and 14, and

Fig. 18 is a cross section of a typical shape produced by the apparatus.

Referring to the drawings and particularly Fig. 1 there is shown a side view of a complete machine. From left to right on the frame and bed generally denoted I8 is a stock reel 20 upon which is'wound strip stock adapted to be cut or ground to shape by the machine. Strip stock 22 from the reel 20 is fed through the hand adjustable guide and tensioning rolls 24, then through a wiping device 26 and thereafter successively past the grinding or cutting heads 28,

30 and 32. Thereafter the stock is again wiped by suitable wiping means 34 and engaged bythe rolls 36 which are driven through intermediate gearing 38 and 40 by the motor 42 and through which the strip material is propelled through the various cutting machines. thereafter rolled upon the reel 44 which is also driven from the motor 42 by a belt drive 46 and friction slip clutch 41. The various details of these elements will be more completely referred to hereinafter.

In Figs. 2 to 11, the details of the grinding heads 30 and 32 areillustrated in detail, it being understood that the heads 30 and 32 are substantially identical except that they are reversely arranged so that the two heads together act symmetrically about a vertical plane upon the strip as it passes through the machine. In Fig. 2, an end elevation of the grinding head is illustrated. The strip stock 22 is illustrated as being supported upon a support, straight edge, or guide plate 59 carried upon an I-section support member 52 of short length rigidly secured to the bed or frame l8 of the machine. In the preferred form of the invention an abrasive wheel 56 rather wheel 56 is carried directly upon the shaft of an The finished stock is electric motor 58 suitably provided with thrust hearings to eliminate end play, the motor being laterally adiustably supported on ways 60 through operation of the hand screw 62 provided with squared ends 64 for the reception of a suitable wrench. The motor is also vertically adjustable on ways or rods 66 and 68 through operation of the screw 10, (see Fig. 4), the details of which will be more particularly described hereinafter.

For this purpose, the motor is bolted or otherwise secured to a yoke ll associated with the screw 10 (see Fig. 4). The rods 66, 88, similarly, are carried by the laterally adjustable yoke member 6| interengaging with the ways 69.

The ways 60 are formed upon a hinged support bracket 12 pivoted about the horizontal axis 14 on hinges l3 and 15 carried on a supporting transversely adjustable mounting plate 16 slidable transversely of the machine upon ways 18 and rigidly secured to the bed or frame l8. Transverse adjustment of the mounting plate is accomplished by means of the screw 82, the latter being fitted with squared ends 84 adapted to receive a suitable wrench. The strip stock support and guide plate 50 is provided on its top surface with a plane face 86 and a slight shoulder or work guide 88 forming a step upon which and against which the strip stock may be fed and accurately guided as it traverses the plate lengthwise thereof. The plane surface 86 extended passes through the pivot axis 14 and must for accuracy throughout the operation of the machine be maintained in this relationship. The face 90 of the grinding or abrasive wheel 56 throughout the operation of the machine lies in a plane which-likewise passes through the axis of the pivot 14. Thus regardless of the pivotal position of the hinged support bracket 12 carrying the motor 58 and the grinding wheel 88 any cutting or grinding action upon a strip 22 fed along the supporting plate 50 must be upon a plane, passing through the pivot axis 14 and will thus produce a surface upon the strip which bears a relation to the under surface of the strip so as to form a sector section, the center of which is at the pivot center 14.

In order to restrict the depth of grinding or cutting upon the strip stock as it passes through and beneath the grinding head, a pair of pilot or guide rollers 92 and 94 are arranged fore and aft of the grinding tool 56 and are carried on shafts 96 and 98 journaled in suitable bearing bosses I00, I02, I04 and I06 carried on the brackets integral with the hinged support bracket 12. As shown the rollers are arranged to travel along the center line of the strip stock and they are adjustably held in position upon their respective shafts by set screws I98 and H0. Support to the strip stock beneath the rollers 92 and 94 is provided by additional I-section strip support blocks 93 and for the head 39, and 95 and 9'! for the head 32. Since commercial strip stock is available in widths greater than those often desired and at a more economical cost than narrower widths, the present apparatus contemplates grinding a strip of double the width finally to be employed and for this reason the grinding head under consideration while the remaining half of the top surface of the strip is ground by the subsequent grinding head 32 which is reversely arranged upon the support framework.

vacuum pressure which will serve to hold the' strip tight upon the plate as it slides thereacross.

The particular arrangement disclosed herein consists of transverse grooves H2 connected by ports H4 leading into longitudinally extending ports II6 which are in turn connected to a main ;upply pipe H8. In practice a relatively slight :ub-atmospheric pressure only is required to sezure the strip tight upon the guide plate and )ecause of the inclination of the grinding wheel as particularly illustrated in Fig. 10, the strip is caused to continuously tightly engage the guide shoulder or step 88 which positions the strip laterally with respect to the pivot axis 14 throughout the abrading action. In order to hold the grinding head and the guide rolls tight upon the top surface of the strip as it is fed through the machine a vacuum cylinder I is provided in order to resiliently urge the hinged support bracket in a clock-wise direction as viewed in Fig. 2 to maintain the grinding head in proper relation. The vacuum cylinder more particularly is carried upon a bracket I22 secured to the adjustable mounting plate 16 and has associated therewith a piston I24 secured to a bracket I26 arranged upon the hinged support bracket I2.

It will appear that, as the strip stock is fed through a particular grinding head of the machine, the rollers 92 and 94 will be raised and lowered slightly to compensate for changes in thickness of the strip stock should there be any and with the raising and lowering of the rollers the cutting or grinding head will at the same time pivot with the rollers around the axis of the pivot I4 so that the surface ground will always lie in a plane passing through the pivotal axis. This results in grinding strip stock into sector cross sections every portion of which is a sector of a circle having a radius such as is fixed by the particular transverse adjustment of the adjustable mounting member I6 which is effected manually through the screw 82. To cut a sector having a short radius, it is merely necessary to manipulate the screw 82 to move the cutting.

head, its adjustable mounting member 16 and hinged support bracket I2, transversely to the right any distance such as may be desired so as to bring the pivot axis I4 the desired distance from the center of the stripor shoulder 88. In order that sectors may be out having one edge coinciding with the center of the circle the pivot pins I28 of the hinges I3 and 15 are recessed as at I30 so that the left-hand edge of the stock may actually be ground to a knife edge and coincide with the pivot axis I4 as is clearly shown in Fig. 6. It will, of course, be understood that the rollers 94 and 92 will be adjusted correspondingly so as to ride along the top face of the strip and if it is desired to grind either a half or the entire strip with a single grinding operation the rollers may be so adjusted as to engage the strip along the line where grinding of the strip laterally to the left is to commence.

Adjustment for various radius of sectors to illustrated in Fig. 2 at I32.

which strip stock may be ground may be facilitated by an annular marking groove in the roller which can readily be aligned with a scribed line upon the strip material, and a plurality of scale indications upon the rod 96, so that by setting the roll 92 properly upon the strip where grinding is to begin, and laterally adjusting the position of the roller on the rod by manipulating the lateral adjusting screw 82, any desired radius may be promptly adjusted for. In order to retain the plane of the face of the grinding wheel 56 true and in line with the axis of the pivot axis I4 a novel automatic feed is provided in conjunction with a diamond point for truing the face. In this connection the grinding head 56 employed is of the hollow cup type so that the grinding surface is an annulus as is The diamond point I 34 for maintaining the end face of the wheel 56 true is mounted upon a swinging arm I36 journaled in a bracket I38 rigidly carried by the laterally adjustable yoke member 6| of which the ways 66 form a part and upon which the motor is vertically adjustable. The arm I36 is adapted to swing or oscillate back and forth across the annular face of the grinding wheel 56, the line of movement of the diamond point, of course, lying in a plane passing through the axis of the pivot I4. In order to compensate for wear of the grinding wheel 56 as well as to maintain the same true by forcing it into slight engagement with the oscillating diamond point, a gradual intermittent feed of the motor upon the ways 66 is provided which is derived from the rotary movement of the guide roller 94. The rotary movement of the guide roller 94 also causes the diamond point to oscillate or traverse the ber is slidably carried by a guide I52 which integral with a part of the frame I40.

To intermittently feed the grinding wheel 56 downward against the diamond and to compensate against wear, the roller 94 through the shaft 98 drives a single tooth intermittent drive wheel I54 which upon each revolution engages and rotates the gear I56 a single tooth pitch. The gear I56 secured to an axle I58 is journaled in a gear .housing extension I59 of the frame 6|. Within the housing and secured on the axle I58 is a worm I60 meshing with a worm wheel I62 carried upon a shaft extension I64 of the screw 10 hereinbefore referred to. Thus as the strip stock is fed through the machine the diamond point is caused to oscillate at a comparatively rapid rate and the grinding wheel is caused to feed at a comparatively slow rate in order to compensate for wear as well as to permit the diamond point to retain the end face thereof in a true plane passing through the pivotal axis. It will be understood that the intermittent drive comprising the wheel I54 and gear I56 may be varied to suit any feed desired, as the rate of wear may vary with the depth of cut, and this may be effected by interchanging gears, or employing an intermittent driverwheel having more than one tooth.

In order that the-simplicity of the machine may be understood, Figures 7, 8 and '9 diagrammati-.

cally illustrate the manner in which the machine automatically and accurately adjusts itself for different strip thickness as well as the manner in which the machine may be readily adjusted to accuratelyshape sectors adapted to form an annulus of any desired diameter. In Figure 7 the guide roller 82 is shown resting upon the center of the strip stock 58 and the distance from the center of the strip stock to the pivot center is indicated by the dimension I18 and in order that the machine may be readily set to any desired radius, graduations 88 are laid ofl on the rod 86 as has previously been described. It will .be observed that the zero radius indication lies on the rod at the point I12 and is determined by drawing a line I" through the pivot center parallel to the line I16 which passes through the center of the strip stock or the center line of the roll and the center of the rod at the edge of the hub as indicated at I18. Should a certain supply of stock become exhausted and thicker stock be supplied to the machine, automatic compensation for the increase in thickness will result. In Figure 8 the thicker stock noted 22' is shown and it will appear that the roller 92 has been lifted a corresponding amount and the angle between the face 88 of the grinding wheel and the face of the guide plate 58 has been correspondingly increased so that the finished ground strip will be ground into a sector adapted to fit in an annulus of exactly the same diameter as the strip shown in Figure '7. I

If it is desired to vary the radius of the annulus in which the strip stock is adapted to fit, in Figure 9 there is illustrated a simple manner of effecting this change by merely shifting the pivot center to the right or left any distance to produce sector stock of a radius I18. When it is considered that in transformer cores where it is desirable to use segmental laminations and, the

reason therefor is because high efliciency is desired, the necessity for accurately cut laminations will be obvious. Thus it will appear that the present machine is composed of a few rigid parts so arranged that accuracy is assured once the machine is set to take any desired sector radius because of the simplicity thereof, and variations in strip thickness do not upset this accuracy or require readjustment.

Referring again to Figure 1 and more particularly the grinding head 28 which is illustrated in some detail in Fig. 12, means are provided for polishing and rendering smooth the bottom face of the strip material before passing through the cutting heads 38 and 32. For this purpose the strip 22 is passed beneath a bridge I88 which carries thereon an inverted guide plate I82 against which the strip material 22 may rest. This guide plate may be provided with suction grooves in a similar fashion to the guide plate illustrated in Figures 10 and 11 if desired and forms a bearing against which the strip material may rest while its under surface is being smoothened by the end face of the grinding weel I84. For this purpose the grinding wheel is directly driven by a motor I86 which is adjustably supported for vertical movement on ways I88 and for transverse movement on ways I 98, the latter being rigidly secured to the bed plate I8 by the depending bracket I82. The adjustment of the motor along the ways I88 is accomplished manually through a squared end shaft I84 which operates a worm and worm gear in substantially the same manner as has been previously described in connection with the grinding heads 38 and 32. For example, the motor I86 is carried upon a yoke I96which in all respects is substantially identical to the yoke II and the yoke-like support I88 for the ways I88 is likewise similar in all respects to the support 6| illustrated in detail in Figs. 2 through 5. This particular grinding wheel is adapted to remove any rough burrs or roughness upon the under surface of the strip material so that upon completion and final cutting the strip material will have ground faces which may be accurately fitted together and against the adjoiningstrlp material in the final lamination assembly. The extent of grinding is extremely slight and no automatic adjustment for wear is needed because of the lightness of the abrasive action in polishing the under surface. The head or the guide block may, if desired, be resiliently mounted for slight movement, so that it can yield slightly to various thicknesses of strip without grinding unnecessarily thereinto.

Referring again to Figure 1, the tension device 24 will be observed as comprising double rolls 288 resiliently pressed together by springs 282, the pressure of which is determined manually by adjusting the pressure screws 284. For simultaneous adjustment the screws are geared together as at 286 and a common manual adjustment shaft 288 provided. In a similar fashion the tension device 36 is constructed, but with the difference that the lower rolls 2 I2 are gear-driven by a common shaft 2 which is in turn belt-driven as at 2| 6 from the gear box 38 and motor 42. The wiping devices 26 and 34 are similar and comprise suitable felt blocks 2I8 and 228 which engage the top and bottom sides of the strip material and are spring pressed together by'a spring 222 pressing downward upon a block 224 which holds the top felt 228, the spring reacting upon a shouldered pin 226 anchored .to a portion of I-section 228 carried on the bed I8.

While the first grinding head modification previously described has numerous advantages, the invention may also employ theuse of peripheral grinding'wheels and a modification of such a grinding head is illustrated in Figures 13 through 17. In this modification the bed or frame I8 carries strip supporting blocks of I- section 238 and 232 and a central supporting block 236 in which is carried a hardened Carboloy rest block 238 across which the strip material traverses during grinding. The block is located immediately beneath the center of the grinding wheel 248 which is of the peripheral grinding type.

The grinding wheel 248 and its driving motor 242 are mounted upon a vertically and laterally adjustable support plate 244, the latter being provided with bearings 246 and 248 for the grinding wheel shaft 258. As illustrated, the grinding wheel shaft 258 is driven by the motor 242 through a belt drive 252. The adjustable support plate 244 ,is vertically adjustable on ways 254 carried upon a laterally adjustable plate 256 having ways 258 engaging the pivoted support bracket 26!]. The pivotal support bracket 268 as before has a horizontal portion 262 which is hinged at 264, in substantially the same manner as the previously described modification. The periphery of the grinding wheel being cylindrical is so arranged with respect to the center of the hinge 264 that an element extended through its horizontal tangential point of contact with the strip material 22 would extend through the center of the hinge. The hinged grinding assembly is laterally adjustable as in the previous modification by reason of its being carried upon a laterally adjustable mounting member 266 which is laterally adjustable with respect to the frame l8 by reason of the screw 268.

The hinged bracket 262 is provided with arms 218 and 212 in turn carrying shafts 214 and 216 On which are adjustably positioned rollers 218 and 288 adapted to guide the pivoted grinding assembly accurately with relation to the top surface of the strip material to compensate for various thicknesses of strip material as has previously been described.

Adjustment for change in radius is accomplished through the adjustment of screw 268 and the axial shifting of rollers 218 and 288 as well as the axial shifting of the grinding wheel 248 on its shaft 258. As illustrated in Figure 15, for this purpose the shaft 258 is splined as at 282 and the grinding wheel and its supporting hub 284 are slidable thereon. For the purpose of accurately positioning the grinding wheel at any desired point along the splines 282, the spline shaft 258 is provided with an axial bore 286 and an elongated slot 288 extending along the length of the shaft 258 and extending into the bore 286. A rod 298 having a pin 292 extending therethrough and through the slot 288- and into a set screw hole in the hub 284 is adapted to position the grinding wheel along the splines 282. In order to lock the position of the rod 298, the same is threaded as at 294 into a sleeve 286 securely held to the end of the shaft 258 by a thimble 298. Thus by rotating the nut sleeve 296 relative to the shaft 258, the rod 298 may be moved to the right or left to position the grinding wheel. A lock nut 388 which may be jammed against the sleeve 296 is adapted to positively secure the grinding wheel in any set position.

While any suitable dressing tool may be provided for the grinding wheel of this latest modification, by reason of it being a peripheral grinder rather than an end grinder as in the previous modification makes it unnecessary that the same be dressed at such frequent intervals. However, to compensate for gradual wear an automatic feed is provided which will gradually cause the plate 244 carrying the motor and grinding wheel to move downward at a rate substantially equal to the wear on the wheel. Such a mechanism is illustrated in detail in Figure 17 and comprises a ratchet and pawl arrangement operated by a rocking lever 382 having a roll follower 384 the grinder 28. Thereafter the grinding head 38 cuts away the material indicated at 3l6 leaving a finished surface 318 extending to the center line 328 of the strip. The grinding head 32 subseadapted to engage a face cam 386 carried on a shaft 214. This latter shaft is rotated by the roller 218 as the strip material is fed through the machine. Oscillation of the lever 382 in response to each revolution of the cam 386 actuates the ratchet and pawl mechanism 388 to rotate an adjustment screw shaft 3H] thereby causing vertical movement with respect to the plate 256 through the guide ways 254. It will, of course, be understood that the hardened Carbol0y'rest block 238 presents a transverse guide surface for the strip material, which guide surface if extended would intersect the axis of the pivot 264. Also the suction cylinder and piston 3i2 acts to maintain the rollers 218 and 288 in tight engagement upon the strip material and thus the grinding wheel 248 operating in conjunction with the guide block 238 must positively produce strip material of segmental section of uniform radius.

In operation the finished strip material, where it is of double width, has a finished shape substantially as shown in Figure 18. As the strip material is fed through the machine it is first wiped clean by the wiper 26 and its under surface 3! is next finished smooth by reason of quently cuts away the material indicated at 322 leaving the finished surface 324. Thereafter the strip material passes through the wiper 34 and is wound upon the reel 44 after which it may be cut to any desired-length and shape by the use of suitable dies. It will, of course, be obvious that to assist grinding or cutting, cutting fluids may be applied to the strip as it passes through the machine.

It will thus appear that a highly rugged and accurate as well as easily adjustable grinding machine has been provided for the preparation and cutting of strip stock'to form any shape of tapered lamination material of segmental cross section and which material after having been cut may be expected to accurately fit together to form annuluses of laminated material with practically no waste of space. In each embodiment of this invention the axis of the pivotal connection between the tool holder and the work supporting means is at the intersection of a prolongation of the contact between the work (when ground) and the cutting tool with a prolongation of the portion of the work surface which is directly opposite that being cut.

Although several embodiments of the invention have been shown and described it is to be understood that the invention is not to be limited thereto, but may be embodied in other mechanical arrangements and forms. As many changes may be made in the construction and arrangement of parts, for example the substitution of equivalent elements in one modification for those in another or the deletion of one or more heads or stages where undesirable and unnecessary, as will be apparent to those skilled in the art, reference will be had to the appended claims for a definition of the limits of the invention.

What I claim is:

1. A strip stock shaping machine comprising a stock rest, a cutting tool, pivotal means for hinging said cutting tool with respect to the rest, said rest being adapted to support at least a portion of a plane surface of the stock being shaped so that when extended it is in alignment with the axis of said pivotal means, and said cutting tool having cutting means adapted to shape at least a portion of a second plane surface on said stock which when extended is in alignment with said axis, means for feeding strip stock over said rest and against said cutting tool, means responsive to the movement of strip stock thru the machine for gradually feeding said cutting tool toward the rest to at least compensate for wear, and means associated with the cutting tool for maintaining its cutting means aligned with said axis, said associated means being adapted to trim saidcutting means in response to over compensating feed for wear.

2. A strip stock shaping machine comprising a stock rest, a cutting tool, pivotal means for hing- 1 rest and against said cutting tool, means responsive to the movement of strip stock thru the machine for gradually feeding said cutting tool toward the rest to at least compensate for wear and means associated with the cutting tool for maintaining its cutting means aligned with said axis said associated means being adapted to trim said cutting means in response to over compensating feed for wear, said associated means being operative simultaneous with the cutting of strip stock.

3. A strip stock shaping machine comprising a stock rest, a cutting tool, pivotal means for hinging said cutting tool with respect to the rest, said rest being adapted to support at least a portion of a plane surface of the stock being shaped so that when extended it is in alignment with the axis of said pivotal means and said cutting tool having cutting means adapted to shape at least a portion of a second plane surface on said stock which when extended is in alignment with said axis, means for feeding strip stock over said rest and against said cutting tool, means for gradually feeding said cutting tool toward the rest to compensate for wear, means associatedwith the cutting tool for maintaining its cutting. means aligned with said axis, said maintaining means for the cutting means operating from the feeding means, and acting simultaneously with the cutting of strip stock.

4. A strip stock shaping machine comprising a stock rest, a cutting tool, and pivotal means for hinging said rest with respect to said tool, said rest being adapted to support at least a portion of a plane surface of the stock so that when extended it is in alignment with the axis of said pivotal means, and said cutting tool having cutting means adapted to shape at least a portion of a second plane surface on said stock which when extended is in alignment with said axis, means dependent upon the thickness of the strip stock for fixing the angular relation between the rest and cutting tool and means for moving said axis towards and away from said rest.

5. A strip stock shaping machine comprising a stock rest, a cutting tool, and pivotal means for hinging said rest with respect to said too], said rest being adapted to support at least a portion of a plane surface of the stock so that when extended it is in alignment with the axis of said pivotal means, and said cutting tool having cutting means adapted to shape at least a portion of a second plane surface on said stock which when extended is in alignment with said axis and means for moving said axis toward and away from said tool and rest, said pivotal means being recessed from the side facing said rest and cutting tool to a point beyond the axis thereof whereby the strip stock may lie on the rest with an edge thereof coinciding with the axis.

6. A strip stock shaping machine comprising a stock rest, a cutting tool, and pivotal means for hinging said rest with respect to said tool, said rest being adapted to support at least a portion of a plane surface of the stock so that when extended it is in alignment with the axis of said pivotal means, and said cutting tool having cutting means adapted to shape at least a portion of a second plane surface on said stock which when extended is in alignment with said axis, and means for moving said axis toward and away from said tool and rest, said pivotal means'being recessed from the side facingsaid rest with an edge thereof within the recess of the pivotal means. a

7. A machine for cutting an inclined surface on magnetic material for radial laminations, including a cutting tool for cooperation with the work, a holder for the tool, means for supporting the work against the thrust of the tool, a guide by means of which the work may be positioned on'said supporting means, a pivotal connection between said work supporting means and said holder about which connection one is moved with respect to the other in changing the relative inclination between the tool and work engaging surface of the work supporting means and having the improvement for enabling the radius of the work to be changed without having to reset said relative inclination of the tool and work supporting means with each such change, which comprises said pivotal connection extending in the general direction in which the work being cut extends and being located with its axis at the intersection of a prolongation of contact between the cuttingtool and work and a prolongation of that portion of the work surface whichis directly opposite that being out, and means whereby the separation of the axis of the pivotal connection from the workguide may be changed.

8. A radial lamination forming-machine comprising a cutting tool for surfacing at least a substantial part of one face of the work, means to support the work against the thrust of the tool while the work is in cooperation with said tool, a holder for said tool, said supporting means and holder.having a pivotal connection therebetween, a guide by means of which the work may be positioned on said support with respect to said pivotal connection, the axis of said connection passing through the intersection of a prolongation of the contact between the tool and work with a prolongation of the portion of the work surface directly opposite the part of the work being cut, and means whereby the separation of the work and the axis of said pivotal connection may be changed to adjust the radius of the work.

9. A radial lamination forming-machine comprising a cutting tool for surfacing at least a substantial part of one face of the work, means to support the work against the thrust of the tool while the work is in cooperation with said tool, a holder for said tool, said supporting means and holder having a pivotal connection therebetween, a guide by means of which the work may be positioned on said supporting. means relative to said pivotal connection, the axis of said con nection passing through the intersection of a prolongation of the contact between the tool and work with a prolongation of the portion of the work directly opposite that portion being cut, whereby on change in the radius of the work being cut the correct angle for cutting a radial face is provided, and mechanism whereby the separation of the axis of the pivotal connection from work may be changed.

10. A radial lamination forming-machine comprising a cutting tool for surfacing at least a substantial part of one face of the work in strip form, a rigid means to support the work against thrust of the tool while it is in cooperation with said tool, a holder for said tool, said supporting means and holder having a pivotal connection therebetween, a guide engaging an edge of the work by means of which the work .may be positioned on said supporting means relative to said pivotal connection, the axis of said connection passing through the intersection of a prolongation of the contact between the tool and work with a pro-,

longation of the contact between the work and the portion of the support directly opposite the work portion being cut, whereby on change in the radius of the work being cut the correct angle for cutting a radial face is provided, means for moving the work strip through the machine and between the tool and the supporting means, means for applying tension to the work strip while being cut, and means whereby the separation of the axis of the pivotal connection from the work may be changed. I

11. In a machine for cutting an inclined surface, a work support, a cutting tool, a holder for the tool, a pivotal connection between the holder and support, a prolongation of the work support and of the contact between the tool and work intersecting at the axis of said pivotal connection, a guide on said support by means of which the work may be positioned with respect to said pivotal connection, a tool for truing the cutting tool, means whereby the cutting tool and the truing tool may be relatively moved toward each other to compensate for wear of the cutting tool, means whereby the cutting tool may be moved relatively to the truing tool so that the truing tool is effective across the cutting tool to maintain the prolongation of the contact between the cutting tool and work passing through the axis of said pivotal connection, and means whereby the separation of the work and the axis of said pivotal connection may be changed to adjust the radius of the work.

12. A machine according to claim 11, in which said truing tool always moves in a plane including said prolongation.

13. A radial lamination forming machine including a work support, a cutting tool, a holder for said tool, the holder and support being relatively movable toward and from one another about a pivotal connection therebetween, the axis of said connection being located atthe intersection of a prolongation of the contact between the tool and work with a prolongation of the portion of the work face directly opposite that being cut, a truing tool for said cutting tool, automatic mechanism responsive to relative movement between the pivotal axis and the cutting tool toward one another substantially normally to said prolongation of the contact between the cutting tool and work for relatively moving said truing tool into the depth of said cutting tool to remove some of the cutting tool and maintain a prolongation of the cutting tool face always passing through said pivotal axis, and means whereby the separation of the work and the axis of said pivotal connection may be changed to adjust the radius of the work.

14. A combination including a cutting tool, a holder therefor, a work support, a pivotal connection between the holder and support, a guide having a work engaging surface which is fixed with respect to the said work support and by means of which the work may be positioned on said support with respect to said pivotal connection and having the improvement which comprises the axis of said pivotal connection being located at the intersection of a prolongation of the contact between the tool and work with a prolongation of the portion of the work which is directly opposite to that being cut, and mechanism for changing the angular distance between the tool and work holder in response to either an increase or a decrease in thickness of -the work, whereby the opposite faces of the work are correctly inclined to each other-for a given radius of the work and irrespective of the thickness of the work, and means whereby the separation of the work and the axis of said pivotal connection may be changed to adjust the radius of the work.

15. A radial lamination forming machine comprising a cutting tool for surfacing at least a substantial part of one face of the work, means to support the work against the thrust of the tool while the work is in cooperation with said tool, a holder for said tool, said supporting means and holder having a pivotal connection therebetween, a guide having a surface for cooperation with the work, said work cooperative surface being fixed with respect to said work supporting means and being adapted to position the work on saidwork supporting means with respect to said pivotal connection, the axis of said connection passing through the intersection of a tool while the work is in cooperation with said tool, a holder for said tool, said supporting means and holder having a pivotal' connection therebetween, a work guide for engagement with an edge of the work and by means of which the work may be positioned on said work supporting means with respect to said pivotal connection, the axis of said connection passing through the intersection of a prolongation of the contact between the tool and work with a prolongation of the portion of the work surface directly opposite the part of the work being cut.

1'7. A radial lamination forming machine comprising a cutting tool for surfacing at least a substantial part of one face of the work, means to support the work against the thrust of the tool while the work is in cooperation with said tool, a holder for said tool, said supporting means and holder having a pivotal connection therebetween, a guide by means of which the work may be positioned on said support with respect to said pivotal connection. the axis of said connection being spaced laterally from the work supporting means, spaced laterally from the cutting surface of said tool and passing through the intersection of a prolongation of the contact between the tool and work with a prolongation of the portion of the work surface directly opposite the part of the work being cut.

18. A radial lamination forming machine comprising a cutting tool for surfacing at least a substantial part of one face of the work, means to support the work against the thrust of the tool while the work is in cooperation with said tool, a holder for said tool, said holder and said work supporting means having a pivotal connec-' tion therebetween, said pivotal connection having its axis passing through the intersection of a prolongation of the contact between the tool and work with the rolongation of the portion of the work surface which is directly opposite that being cut, and means whereby the separation of the axis of said pivotal connection from the work may be changed to adjust the radius of the work.

HOWARD E. SOMES.

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