US1672147A - Stock-fitting machine - Google Patents

Description

June 5, 1928.

vsi. c. BAXTER STOCK FITTING MACHINE 3 Sheets-Sheet l H a l .V 4.1 c 1x J l if n June 5, 1928. 1,672,147

w. c. BAXTER STOCK FITTING MACHINE y FIILNov. 7, 1923 3 sheets-sheet 2 'l 6466 1.59 /0 i l Z f X' 45 a 76 *l l 2 l ,Ma 11,'7 22 :,L-s

@5I `L`O+ 'l' 62 9o 7 70 s \a6 W 74 /06 l 76 V06 0 /NvE/vmn- June 5, 1928. 1,672,147

- w. c. BlAxTr-:R

STOCK FITTING MACHINE Filed Nov '7, l? 5 Sheets-Sheet 3 Patented June 5, 1928.

. UNITED STATES PATENT OFFICE.

WILLIAM C. EAXTEEOE BEVERLY, MASSACHUSETTS, ASSIGNOR To UNITED SHOE MACHINERY CoEEoEAT1oN,oE PATEESoN-NEW JERSEY,y A coEroaATmN kor NEW JERSEY.

SToCK-ETTTING MACHINE.

Application ined November 7, 1923. serrai- No. 673,373.

The present invention relates to Stock-fit ting machines and is herein illustrated as embodied in a machine forskiving counter stiffener blanks.

A common type of machine for skiving such blanks operates to iex or distort them and to skive them in their flexed condition. Such a machine may comprise, for example, a pair of rolls and aknife the edge of Which is located close to the bite of the rolls, one of the rolls having formed therein a matrix into which the `blank is forced by the cooperating roll or by other Suitable presser device so asto flex the blank in the desired manner While it is being fed to the knife. In machines of this kind, considerable difficulty has been encountered in forcing the blank firm-ly into the matrix at the locality in which thev blank is being operated upon by the knife; and unless the proper liexure of the blank is brought about, the finished stiffener Will not correspond exactly to the shape of the matrix. This difficulty in obtaining and maintainingthe proper flexure is due in part at least tothe fact that the rolls must be of comparatively large diameter, in order to provide room for the matrix and to provide sufficient strength to Hex the blank; and Since the knife vmust have con siderable thickness of stock close to its cutting edge to givek it the required strength, the edge of said knife cannot be located as closely as is desirable to the Vbite of the rolls.

According to one feature of the invention, v the blank is flexed at a locality spaced 'from y the cutting edge ofthe knife or other tool to which it is being fed, and means are located between this locality and the knife, an-d preferably close to the edge of the knife for maintaining this flexure. In the illustrative machine, the blank is flexed at 'a short distance in front of the knife by cooperating matrix and presser rolls of considerable size,` and is then held inv its flexed f condition on the matrix roll by a small presser device Which is located close to the edge ofthe knife. lith such a construc tion it is possible to use flexing members of sufficient size and strength to insure proper flexing of the blank and at the same time to hold the flexed blank firmly in the matrix close to the edge of the knife at the 4locality in which the skiving is taking place.

In order to. insure complete flexing of the blank, the presser roll, according to another. feature of the invention, is a patrix roll having a protuberance which is the reverse of the matrix,.and preferably another roll of yielding imaterial is provided to impart a preliminary bend of the blank about the matrix. lVith this construction a very thorough flexing of the blank is secured which greatly facilitates the maintaining of the flexure at the locality in Which'the knife acts upon it. j

Other features of the invention relatey to the use of matrix and patrix rolls so shaped that the blank is fed in the direction of its length,`to the provision of a rotary tubular knife of large diameter, to grinding mechanism'for the knife, and to certain details of construction and combinations of parts which will be described as embodied in an illustrative machine and pointed' out in the appended claims.

Referring now to the accompanying drawings:

- Figure l yis a perspective view, partially in section, Showing the greater lpart of the machine; f f i i Fig. 2 isa vertical,` sectional view of a portion of the machine; Figf is a perspective view of certain parts shown in Fig. 2;

Fig. ais a-perspective view showing a portion of acoun-ter blank after it has been lskived and also a .portion of the Waste piece produced by the skiving operation;

Fig. 5 is a view .in front elevation of the entire machine; and e 1 Figs.- 6, 7 and 8 are detail views, partially in section., along the lines 6 6, 7 7 and 8--8 of Fig. 2.

In the drawings a patrix roll iS indicated at 10 and a matrix roll at l2, the patrix roll having a protuberance'M and the matrix roll being formed with a cavity -16 to cooperate `with the 'protuberance 1,4r transandfpatrix rolls and to conform the blank more or less to the contour of the pretuberance 14 before the blank is pressed into the caivty of the matrix roll. A supply of blanks to be operated upon is stacked one above another in a magazine 22, and the blanks are fed one by onefrom the bottom of the magazine by means of a reciprocating pusher 24, which introduces them between the rolls l0 and 20 in such timed relation with the other operating parts of the machine that the blanks will register with the cavity in the matrix roll. After advancing beyond the bite of the rolls l0 and 12, the blank passes beneath a feed roll 26 which cooperates with the matrix roll to feed the blank against the skiving knife 28. As shown, the feed roll 26 is provided with a series of deep, transverse grooves 30 in its periphery and in each groove there is located one of a series of yielding presser fingers 32 which function to hold the blank firmly seated in the cavity of the matrix roll while the blank is being operated upon by the skiving knife. The knife 28 is .of the tubular or ring type and consists of an endless, circular band arranged with its cuttil'ig edge located substantially in the common axial plane of the rolls l2 and 26. To permit the cutting edge of the knife 28 to be located relatively to the co-operating rolls l2 and 26, as above described, the periphery of the matrix roll 12 is convexly curved in an axial direction, as shown in Figs. 6 and 7, to conform substantially to the peripheral curvature of the knife, and the periphery of the feed roll 26 is made concave in an axial direction, as shown, in Fig. 6, to conform to the convexity of the roll l2, thus to insure more efficient co-operation between said rolls l2 and 26 for the purpose of feeding the blanks.

The various elements above mentioned are supported by a suitable frame comprising a base 34 and spider- like standards 36 and 38 which rise from the base in spaced apart relation at the front and rear of the machine. The patrix roll l() and the matrix roll l2 are fixedy upon horizontal shafts 40 and 42 respectively, while the feed rolls 20 and 26 are fixed upon horizontal shafts 44 and 46 respectively. The shaft 42 of the matrix roll and the shaft 44 of the feed roll 2() are journaled in fixed bearings in the frame. The shaft 40 of the patrix roll is journaled in bearing blocks 48, which are slidable in vertical guideways formed in portions of the frame, one of these guideways being shown at 50 in Fig. l. Springs 52, which are confined in the guideways above the bearing blocks 48, press downwardly upon the latter to hold the patrix roll firmly in co-operative relation with both the matrix roll and the feed roll 20. The feed roll 26 is journaled in bearing blocks 54, which are slidable in vertical guideways in the frame rshanks 60 and the bearing plate 66.

segments at the rear of the guideways 50 and are pressed downwardly by means of springs such as that shown at 56 in Fig. l, these springs maintaining said feed roll in yielding, co-operative relation with the matrix roll.

The presser fingers 32 depend from rectangular shanks 60, which are vertically disposed in side-by-side relation in a stationary slide bearing 62 supported by the frame. Upward extensions 64 of the shanks 60 project through apertures in a fixed, horizontal bearing plate 66, which is spaced above the slide bearing 62. The presser' fingers 32 are provided with hook-like lower extremities (F 2 and which embrace the reduced of springs 68 which surround the extensions 64 and are confined vbetween the rectangular The pressure of the ngers 32 effectively holds the blank in the cavity of the matrix roll at points substantially in the plane of the cutting edge of the knife, and thus insures that the transverse fiexure imparted to the blank by the rolls l0 and l2 will be maintained while the blank is being skived.

The tubular skiving knife 28 is made of/ ribbon stock bent in to the formr of a ring, the ends of the stock being butted together and o ne longitudinal edge beveled at its outer side to form the cutting edge of the knife. The knife is secured to a rotatable carrier 70 comprising a disk-like structure having a hub 72 splined upon a horizontal shaft 74 that is journa-led in bearings 76 in the frame standards 36 and 38. yLongitudinal movement of the shaft 74 in its bearings is prevented by collars 78, which are fixed on the shaft and bear against opposite ends of the forward bea-ring 76. The tubular knife 28 is expanded against the interior of a peripheral flange 80 on the knife carrier 7() by means of a clamping core composed of a plurality of segments 82. 82 are arranged to engage the inner face of the knife and are secured to the knife carrier'by means of screws 84 which extend through radial slots 86 in the knife carrier and are threaded into the core segments 82, the slots 86 permitting outward movement of the segments as the clamping core is expanded to clamp the knife blade in place. The clamping core expanded by means of a collar 88, which encirclcs the hub 72 of the knife carrier and is formed with a conical periphery for engagement with the correspondingly inclinedinner faces of the core 82. Screws 90, which extend through the knife carrier 70 and are threaded into the collar 88, provide means for moving the collar axially, to enable it The segments Cil to perform itsk corefexpanding function,l and for holding the collar in operative position. After.y the lmife has. been clamped by the expansion of the core, the core sections 82 may be securely.y held in clamping position by tightening the screws 84. Outward adjustment of the knife blade relatively to the knife carrier may be effected by means of screws. 92, which are threaded through the knife carrier in longitudinal alinement with theV knife blade, the inner ends of ythese screws engaging fslidable spacing blocks 94, which are confined between the peripheries ofthe knife carrier and the expanding core sections and are interposed between the sere-ws 92 and the. knife blade. The' rear bearing for the knife shaft 74 is formed integralliy with a removable portion of the rear frame standard which isy of somewhat greater diameter than the knife carrier and 1s secured tothe fixed portion of the frame by means of screws 96. By removing the screws 96, the rear bearingl 7 6 and: the parts integrally'r formed therewith mayv be de'- tached from: the frame to permit the removal of the knife carrier.

The knife shaft 'Z4 is hollow, and a cylindrical block 9.82 that'is slidably mounted within the hollow shaft carries av laterally projecting pin 100, which extends through an elongated, longitudinal slot 102,` in the shaft and into the hub 72 of the knife carrier.. A spring 106 is confined within the hollow knife shaft betweenthe slide block 9.8,- anda plug 108 which is threaded at the rear extremity of the shaft. An, adjusting rod 110, having a knu-rled head 112 at' its outer end, extends through the hollow knife shaft intoengagement with the forward end' of the slide block 98.A The portion of the adjusting rod 110K adjacent to. its head 112is threaded into the forward end of the knife shaft. The inner extremity of the rod 110 serves as an adjustable abutment` to prevent forward axial displacement of the knife carrier under the influence of the spring 166 and thus to determine the location of the plane of the knife edge relatively to the matrix roll 12 and feed roll 26. By means of the above described Construction, the knife carrier, while constrained to Vrotate with the knife shaft,y may nevertheless be adjusted axially in either directionI by turning the adjusting rod 110.

rlhe lniife, the matrix and patrix rolls, and the feed roll-s are driven from a main shaft 116 l(Fig. 5)., which is journaled inv Vof theI pusher.

main shaft 116 'by means of a sprocket chain 126,which passes over' a sprocket wheel 128 on the feed wheel shaft 44 and -over- -a s sprocket wheel 130 on the main shaft 116.

A gear 132 is fixed on the feed-roll shaft 44 and meshes with a gear 134 which is .fast on shaft 40 that carries the patrix roll. The gear 134 meshes with a gear 136, which is fast on the shaft 42 of the matrix roll. The

gear 136, in turn, meshes with a gear 138,

which is fixed on the shaft 46 of the feed roll 26.. l

To permit the blanks to be fed one by one from the bottom of the stack in the magazine 22, the pusher 24, which is mounted to slide in the bottom wall of the magazine,

As shown, the pusher 24 ,is notched at 140 to receive the pointed end of the counter blank, this constructionV insuring that the blank will be maintained under control while it is being fed from the magazine to the feed roll 20. presentedY 'to the bite of the rolls 10 and. 2() at such time that the blanks will thereafter register with the cavity of the matrix roll, provision is made for reciprocating the pusher 24 in timed relationwith the movement .of the matrix roll. To this endthe pusher 24 ispivotally connected with the upper end of a rocker arm 142, and said arm is connected by a link 144 with the lower end of anr actuating lever `146. The lever 146 is pivoted at 148 to the maga-zine 22, and a portion of the lever extends upwardly beyond thepivot 148 into the path of a pin 150 ywhich projects from oner end of the patrix roll. A spring 152, which is secured at one end to a portion of the magazine and at the opposite end to the rocker arm 142, tends to move the pusher rearwardly to feed a blank from the magazine. At each rotation ofthe patrix roll, the pin 150 engages thelever 146 land swings Iit in a direction to slide the pusher against the tension of the spring 152 until the blank engaging` end of the pusher has been retracted from beneath the stack in vthe magazine to permit the lowermost blank to drop into place in front is the rotation of the patrix roll-'causes the pin 150 toride off from the lever 146, the spring 152 lprojects the pusher through the magazine, thus feeding the lower blank eudwise therefrom and introducing it between the rolls 1() and 20. The timing of the forward stroke of the pusher vmay be varied by changing the position of the pin 150 in the patrix roll, a series of pin-receiv- To insure that the blanks will be f the pin.

ing holes 154 being provided in the lend of said roll to permit such adjustment of In order that the length of stroke of the pusher 24 may be varied in accordance with the length of the blanks to be operated upon and the distance between the magazine and matrix roll, the link 144 is con nected with the lever 146 by means of a pivot stud 154, which is adjustable in a longitudi nal slot- 156 in the lever 146. The ,stroke of the pusher may be lengthened or shortened by adjustment of the pivot stud 154 in the slot 156, thus changing the effective length of the lower arm of said lever.

As each blank passes' between the rolls 10 and 20, the blank is linitially flexed transversely by the action of the rubber roll 2O so that the blank is preliminarily bent around the protuberance on the patrix roll and is conformed more or less fully to the transverse curvature thereof. As the blank is gripped between the rolls 10 and 20, said rolls function to feed the blank to the bite of the matrix and patrix rolls and as the blank passes between the latter the protuberance 14 functions to press the blank firmly into the cavity 16 of the matrix roll, as shown in Fig. 7 and thus definitely to determine the portion of the blank which is to be removed by the skiving knife. As the blank passes between the rolls 12 and 26, these rolls function to continue the feed of the blank to advance it positively against the edge of the rotatingknife 28, while the presser lingers 82 engage the portion of the blank which is being acted upon by the skiving knife and hold said portion firmly seated in the cavity of the matrix roll. Thewaste portion removed by the ,skivingbperation passesupwardly, as shown 1n Fig. 2., and esca pes Vthrough an opening 158 in the frame. rf'he skived blank passes downwardly Iinto a chute 160, which directs it into a suitable receptacle tnot shown).

To insure that a keen cutting edge shall be presented at all times to thework, the machine is provided with a grinding wheel 162, which continuously maintained in engagement with the beveled edge of the knife, and which is driven continuously throughout the operation of the machine. The grinding wheel 162 is formed with a lateral grinding surface, which is beveled to produce the desired grinding effect upon the knife. The grinding wheel is carried by a vertical spindle, which is located at one side of the vertical axial plane of the knife and which is made in two parts, an upper section 164, which carries the grinding wheel, and a lower section 166 which carries part of the driving mechanism for the grinding wheel as will hereinafter appear. The upper spindle section 164 is journaled at its upper end in a bushing 168 the lower end of which carries a thrust collar 170 for engagement with the adjacent end of the hub of the grinding wheel. The bushing 168is screwthreaded for vertical adjustment in a fixed bracket 172 that is secured to the base 34 of the frame, and a lock nut 174 serves to maintain said bushing and the thrust `collar 170 in vertically adjusted position. rThe lower spindle section 166 is journaled in a' suitable bearing in the bracket 172 and is coupled to the upper spindle section by a tongue-andgroove connection, shown in Fig. I1 at 176, whereby the two parts of the spindle are con strained to rotate in unison but are adapted for a limited amount of lengthwise relative movement. A spring 178, which is interposed between the hub of the grinding wheel and a collar 180 on the lower spindle section, tends to separate the spindle sections and to hold the grinding wheel yieldingly against the knife. The lower spindle section carries a friction driving wheel 182 which is driven from the outer surface of the knife carrier through an intermediate friction wheel 184. The wheel 184 is mounted upon a yoke 186, which isfconnected by alined, horizontal pivots with the bracket 172, one of saidvpivots being shown at165 in Fig. 1. The intermediate friction wheel 184 has a fiat, peripheral face for engagement with the exterior of the knife carrier and a beveled face 188 for engagement with a correspondingly beveled face on the friction wheel 182. The friction wheel 182V is held in operative engagement with the 'intermediate wheel 188 by means of a lever 198 pivoted at 192 to the bracket 172 and having its innerend arranged to engage beneath the hub of the friction wheel 182. The outer extremity of the lever 190 is yapertured toreceive a vertical Apost 194 threaded at lts upper end to receive an adjusting nut 196. The nut 196 may be turned in one direction to depress the outer end of the lever 19() against a spring 198,' which interposed between said lever andthe bracket 172, and thus to elevate the inner end of said lever to increase the amount of friction between the roll 184 and the knife carrier andy also between the roll 184 and the frictionfwheel 182. Byturning the nut 196 in the opposite di rection, the spring 198 will raise the louter end of the lever 19() so that'the friction against the driving members 182 and-184 will be reduced.

A suitable dressing tool 200 may be provided for removing from the knife any burr produced by the grinding wheel.` As shown, the dressing tool is mounted in va tubular holder 202 fixedly secured to the frameof the machine which is provided with an adjusting screw 204 for moving the dressing tool toward the grinding wheel as the tool wears away.

Although the invention has been set forth as embodied in a particular machine, it is to be 'understood that the invention Vis not limited inthe scope of its application to the particular machine which has been shown and described.

,Having thus described my invention, what I claim :as new and desire to secure :by-Let` ters Patent of the United States is:

. 1. In `a machine of the class described, means including cooperating rolls for flexing a piece of stock, means removed from the point of operation of said flexing .means for performing a subsequent operation upon a portionof the .stock ioffset by the flexing action, `and means for maintaining the flexure yof the stock during the performance of said subsequent operation. p

2. In a machine of the vclass K described, means including cooperating rolls forflexing apiece of stock, means removed. from the point of operation vvof said flexing means for performingy a second-operation upon a portion fof the stocky offset yby the 'flexing action, and means lcopper-ating with a portion of the flexing means for maintaining the flexure of the stock during the performance of said second operation.

3. In .a machine of the class described, means including cooperating rolls for flexing a piece of stock, means spaced from the pointof operation vof said flexing means foi removing a portion of thestock loffset by the flexing action, and means for maintainingr the stock in flexed condition while saidportion is being removed.

4.-.. In a stock fitting machine, means for flexing a piece of stock and feeding it as it is being flexed, means removed from the point of operation of said flexing means for removing from the stock a portion offset by thel flexing operation, and means for maintaining :the flexure of the stock during the removal of said portion therefrom. I

v5. In a machine of the class described, means for flexing an article and feeding it as it is being flexed, means removed from the point of operation of said flexing means for skiving the article to remove a portion offset 'by the flexing operation, and means for'. maintaining ythe articlein flexed condi-- tion while it is being skived, said means beingeffective to continue. the feed of the article.

6. In a machine lof theV class described. means for .flexing an article and feeding it as it -is beingflexed, a knife located beyond the point of operation of said flexing means for skiving the article to remove a portion o'ffsetby the flexing operation, and'means for continuing the feed of the article to advance it against the knife.

7. In ay machine yofthe class described, matrix and patrix rolls co-operating to flex a piece of stockfed between them, means located beyond the bite of said rolls for removing from the Vstock a portionoffset by the flexingoperation, sind means for maintaining the flexu-re of the stock during the stock removing operation. y

y8. In a machine Aof the class described.,

lmatrix and patrix rolls Vcooperating to feed an article and to flex it transversely with respect to its direction of feed, and means spaced from the point of operation of said l .means located close yto kthe cutter' 4fer maintaining the flexure duri-.ng the cutting 'operation.

l0. In a machine of theclass described, a cutter for operating upon a piece ofstock, cooperating matrix and trix rolls so located that their bite is in rontof and spaced from the cutter, Vand a presser located between the bite of the rolls and the cutter.

11. In a machine of the class described, matrix and patrix rolls Lco-operating to flex an article passed between them, yielding means for engaging the 'article at a point beyond the common axial'plane of said rolls and pressing the article against one of said rolls to maintain the blank in flexed condi-V tion, and means for skiving the blank tore move aportion offset by the flexing operation.

12. In a machine of the class described, matrix and patrix rolls `co-operating to flex a piece of lstock passed between them, va plural-ity of pressure-applying :fingers arranged to co-operate with one of said rolls to maintain the stock in flexed condition, and means for skiving the stock to .remove a portion offset by the flexing operation.

13. In a machine v of the class described, a cutter, a matrix roll adaptedto support .a pieceV of` stock dur-ing the vcutting operation, a rol-l of comparatively large yd1ameter for forcing the piece into the matrix at a point spaced from the edge of` the cutter, anda presser of small cross-section adapted to co-y operate With. the matrix roll and located close to the cutter.

14. In a machine ofthe class described, matrix and patrix rolls co-operat-ing-to feed an article and flex it while it is being fed, a knife for skiving the articleafter it has been flexed, and means including a` plurality of pressure-applying fingers arranged to cooperate with one of said rolls to maintain the blank in its flexed condition while-it is being skived and tocontinue the feed of the article to advance it againstv the skiving knife.

15. In a r machiney of 'the class described, matrix and patrix rolls cti-operating toflex a blank passed between them, yielding means for pressing` the blank against one of said rolls after it has been flexed to maintain its flexed condition, and a knife located closely adjacent to the point of operation of saidv pressing means for skiving the blank to remove a portion offset by the flexing operation.- i

16. In a machine of the class described, matrix and patrix rolls co-operating to flex a blank'passed between them, means co-operating with one of said rolls to maintainV the blank in its flexed condition after it leaves the bite of said rolls, a rotary tubular skiving knife arranged with the plane of its cutting edge adjacent to the point of operation of said last-named roll and said means, and means for driving said rolls and the knife.

17. In a machine of the class described, matrix and patrix rolls co-operating to flex an article, means co-operating with one of said rolls to feed the article into the bite of the said rolls, and means for skiving the flexed article to remove portions offset by the flexing operation.

18. In a machine of the class described, matrix and patrix rolls co-operating to flex an article, means co-operating with the patrix roll to feed the article into the bite of said rolls and to conform the article more or less 'to the contour of the patrix roll before the article passes between the rolls, and means for skiving the article to 'remove portions offset by the flexing operation.

19. In a machine of the class described, matrix and patrix rolls co-operating to flex an-article, a member co-operating with one of said rolls preliminarily to shape the article to the contour of the latter and to feed the article into the bite of the said rolls, and means for skiving the flexed article to remove portions offset by the flexing operation.

20. In a machine of the class described, matrix and patrix rolls co-operating to feed an elongated blank lengthwise between them and to flex the blank transversely, a third roll beyond the bite of said rolls co-operat ing with'one of the latter to supplement their feeding action, and a knife arranged with' its cutting edge adjacent tothe bite of said third roll and the roll co-operating therewith to scarf the flexed blank.

21. Ina machine of the class described, a matrix roll having a cavity to receive a blank to be skived, a patrix roll having a protuberance complementary to said cavity for pressing the blank into the latter, a knife for skiving the'blank at-a point spaced from the common axial plane of said rolls to remove the portion offset by the flexing operation, and means co-operating with the matrix roll to feed `the blank against the knife and to hold the blank seated in said cavity while .being skived.

22, In a machine of the class described, a matrix roll vhaving a peripheral cavity shaped to receive a counter stiffener blank, the circumference of said roll being greater than the length of the blank and the length 0f the cavity extending` in a direction transverse to the axis of the roll, a patrix roll having a protuberance complemental to said cavity for co-operating with theV latter to flex the blank, a third roll of less diameter. than the matrix roll co-operating with the latter at a point beyond the common axial plane of said rolls to continue the feed of the blank, and a knife arranged with its `cutting edge closely adjacent to the common axial plane of the matrix roll and the third roll for skiving the blank to remove the portions offset by the flexing operations. i

23. In a machine of the classdescribed, means including a matrix roll and a cooperating roll for feeding and flexing a blank, a knife spaced from the locality in which these rolls engage the blank, a transversely grooved feed roll cooperating with the matrix roll closely adjacent to the edge of the knife, and presser fingers extending into the o'rooves of the transversely grooved roll for pressing the blank against the matrix roll to maintain the blank in flexed condition during the operation of the knife.

24. In a machine of the class described, matrix and patrix rolls Jo-operating to flex a blank fed between them, means co-operating with one of said rolls to maintain the blank in flexed condition after it leaves the bite of said rolls, a rotary tubular skiving knife arranged with the plane of its cutting edge adjacent to the point of operation of said means for skiving the blank to remove portions offset by the flexing operation, and' means for adjusting the knife axially -in either direction.

25, In a machine of the class described, matrix and patrix rolls co-operating to flex a blank .fed between them, means co-operating withY one of said rolls to maintain the blank in its flexed conditionafter it leaves the bite of said rolls, a rotary tubular skiving knife arrangedwith the plane of itscutting edge adjacent tothe point of operation of said means for skiving the blank to remove portions offset by the flexing operation, means for rotating the knife, means Vfor sharpening the knife as it rotates, and means for adjusting the knife relatively to said sharpening means to compensate for the wearing away of its cutting edge.

26. In a machine ofthe class described, matrix and patrix rolls co-operating to'flex a blank fed between them, means co-operating with one of said rolls to maintain the blank in its flexed condition after it leaves the bite of said rolls, a rotary tubular skiving knife arranged with the planefof lits cutting edge adjacent to the point of operation of said means for skiving the blank to remove portions offset by the flexing operation, a grinding wheel for maintaining a sharp cutting edge upon said knife lthroughout the operation of the machine, and means for driving the knife, the matrix and patrix rolls, and the grinding wheel continuously, throughout the operation of the machine.

27. In a machine of the Class described, matrix and patrix rolls co-operating to flex a blank fed between them, means cooperat ing with one of said rolls to maintain the blank in its flexed condition after it leaves the bite of said rolls, a tubular skiving knife arranged with the plane of its cutting edge adjacent to the point of operation of said means for skiving the blank to removerpor-` tions offset by the flexing operation, a rotary carrier for said knife, a grinding wheel for maintaining a sharp cutting edge upon said knife throughout the operation of said machine, positive driving means for said knife carrier and rolls, friction driving connections between the knife Vcarrier and the grinding wheel, and means for adjusting said connections to vary the amount of friction. I

Q8. In a machine of the class described, matrix and patrix rolls, co-operating to flex a blank fed between them, pressure-applying means co-operating with one of said rolls to maintain the blank in its flexed condition, and a knife arranged with its cutting edge closely adjacent to the point of opera- 'tion of said pressure-applying means for skiving the blank to remove portions offset by the flexing operation.

29. In a machine of the class described, matrix and patrix rolls cov-operating to flex a blank fed between them, a third roll cooperating with one of said rolls to continue the feed of the blank after -it leaves the bite of said rolls, and a4 skiving knife arranged with its cutting edge closely adjacent to the common axial plane of said last-named coupon, means .for removing the blanks one by one from the magazine and introducing them between said rolls in position to register with the cavity in the matrix roll, a knife havingits cutting edge remote from the bite of said rolls for skiving the blanks to remove'a portion offset by the flexing operation, and means for maintaining the blanks in flexed condition while beingy skived.

31. In a machine of the character described, matrix and patrix rolls co-operating to feed and flex a blank, a third roll cooperating with the patrixk roll to press the blank against the latter before the blank is acted upon by the matrix roll and'to feed the blank into the bite of the matrix and patrix rolls,.means for skiving the blank to remove material offset by the flexing operation, a magazine for holding a supply of blanks to be operated upon, a reciprocating pusher for removing the blanks one at a time from the magazine and introducing them between said third rolland the patrix roll, and mechanism for actuating said pusher in such timed relation to the matrix roll that the blankswill register with the cavity therein.

3Q. In amachine of the class described, a matrix roll and a presser roll co-operating to flex an article, means for holding an article against one of said rolls to cause the article to be fed to the bite of the rolls, and means for skiving the article to remove portions offset by the flexing operation.

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

WILLIAM o.A BAXTER.

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