US3163031A

US3163031A - Shoe bottom roughing machines

Info

Publication number: US3163031A
Application number: US203904A
Authority: US
Inventors: Kestell Thomas Aubrey
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1961-06-28
Filing date: 1962-06-20
Publication date: 1964-12-29
Anticipated expiration: 1981-12-29

Description

Dec. 29, 1964 T. A. KESTELL SHOE BOTTOM ROUGHING MACHINES l0 Sheets-Sheet 1 Filed June 20. 1962 Dec. 29, 1964 T. A. KESTELL SHOE BOTTOM ROUGHING MACHINES l0 Sheets-Sheet 2 Filed June 20, 1962 wsw Dec- 29, 1964 T. A. KESTELL 3,163,031

SHOE BOTTOM ROUGHING MACHINES Filed June 20, 1962 10 Sheets-Sheet 3 Dec. 29, 1964 T. A. KESTELL 3,163,031

SHOE BOTTOM ROUGHING MACHINES Filed June 20. 1962 10 Sheets-Sheet 4 Dec. 29, 1964 T. A. KESTELL 3,163,031

SHOE BOTTOM ROUGHING MACHINES Filed June 20, 1962 10 Sheets-Sheet 5 336 242 f 330 256 20 Ell/9: 5 5245 Z42 Dec. 29, 1964 T. A. KESTELL SHOE BOTTOM ROUGHING MACHINES l0 Sheets-Sheet 6 Filed June 20, 1962 www T. A. KESTELL SHOE BOTTOM ROUGHING MACHINES Dec. 29, 1964 10 Sheets-Sheet 7 Filed June 20, 1962 Dec. 29, 1964 T. A. KESTELL 3,163,031

sacs: BOTTOM ROUGHING MACHINES Filed June 1962 10 Sheets-Sheet .8

A310 322 W 337 .1368 W 344 036 nil K 336 \V 3g 615- $2,336 332 m 359 3% a 77 ///7/7Z h 029 t 3 5 3/ w Dec. 29, 1964 1'. A. KESTELL 3,163,031

SHOE BOTTOM ROUGHING MACHINES Filed June 20. 1962 10 Sheets-Sheet 9 1964 '1'. A. KESTELL' 3,163,031

SHOE BOTTOM ROUGHING MACHINES Filed June 20, 1962 10 Sheets-Sheet 10 United States Patent Ofitice 3,lb3,ii3i Patented Dec. 29, 1964 3,163,031 SHOE BOTTQM RUUGHENG MACHINES Thomas Aubrey Kestell, Leicester, Engianti, assignor to United Shoe Machinery Corporation, Flemington, N.J., a corporation of New Jersey Filed June 26, 1962, Ser. No. 203,994 Claims priority, appiieation Great Britain June 28, 1961 28 Claims. (Cl. 69-65) v This invention relates to shoe machinery and more particularly to machines for roughing the bottoms of partially fabricated shoes prior to the attachment of outsoles.

In the preparation of a shoe bottom for cement sole attaching, it has been the usual practice for an operator to present a shoe manually to a roughing machine which generally includes a power driven circular wire brush. The shoe, on a last, includes an upper, the marginal portion of which has been lasted inwardly over the insole around the perimeter of the shoe bottom. The overlasted surface of the upper is that which must be roughed, the operator taking care not to extend the roughing operation beyond the feather line of the shoe. The success of the operation, therefore, depends entirely upon the skill of the operator and not only must care be taken that the roughing does not extend onto portions of the upper that will be visible after the outsole has been attached but also the lasted margin of the upper must be abraded sufficiently to offer a good attaching surface for the outsole cement.

It is the principal object of this invention to provide a machine for roughing the sole attaching surfaces of partially fabricated shoes which operates automatically and requires little or no skill on the part of an operator.

Another object of this invention is to provide a shoe bottom roughing machine having a roughing tool which automatically follows the variable contour of the shoe n bottom during the roughing operation.

It is another object of this invention to provide an automatic shoe bottom roughing machine in which the angular relationship between the roughing instrumentality and the shoe remains substantially constant throughout the operation.

It is still another object of this invention to provide an automatic shoe bottom roughing machine having means for assuring that the roughing operation will not extend onto areas of the shoe which will be visible after an outsole has been attached.

Yet another object of this invention is to provide a shoe bottom roughing machine with roughing instrumentalities which will operate at varying degrees of pressure on the shoe bottom.

Still another object of this invention is to provide a shoe bottom roughing machine having roughing instrumentalities which may be adjusted to vary the amount of roughing imparted to the shoe and the amount of pressure with which the roughing operation takes place.

In accordance with these objects and as a feature of this invention there is provided an automatic shoe bottom roughing machine, an illustrative example of which will hereinafter be described in detail, which includes means for supporting a partially fabricated shoe on a last with its bottom facing upwardly, a power driven rotary tool and means for moving the tool automatically about the shoe bottom in a continuous peripheral movement whereby the tool operates on the lasted margin of the upper moving in a path conforming to the outline of the shoe. The tool moving means are adjustable to vary the initial position of the tool in accordance with the size of the particular shoe being operated on. The amount of movement of the tool along the heel-toe axis of the shoe bottom, as Well as transversely thereof, is variable in accordance with the size of the shoe.

As another feature of the invention, the support means provided to present the shoe bottom upward to the tool is pivotal in a predetermined manner about an axis extending substantially parallel with the heel-toe axis of the shoe so that the angle between the tool and shoe bottom remains uniform with respect to the variable contour of the shoe bottom across its width. The machine is also provided with means to pivot the tool simultaneously in a predetermined manner transversely of the heel-toe axis so that the angle between the tool and the shoe remains uniform with respect to the variable contour of the shoe bottom in the heel-toe direction. The combined result of pivoting the shoe and the tool is to insure that the tool not only engages the shoe at a uniform angle about its entire perimeter but also to insure that the individual roughing elements of the tool move from the outer edge or feather line of the shoe bottom across the lasted margin toward the inside of the shoe and thereby produces a wiping action to the margin of the lasted upper.

As another feature, the various motions imparted to the tool in its travel about the shoe and the rocking motions imparted to the tool and the shoe support originate from the same power input shaft. Means are provided for varying the speed of the input shaft in accordance with the location of the tool with respect to the shoe perimeter whereby the tool operates progressively about the margin of the bottom at a variable speed.

Still other features are embodied in the work support which is operated by yieldable means to elevate the shoe toward the tool and to maintain the shoe yieldingly in engagement with the tool during the operation on its bottom. This invention also contemplates the use of control means which cooperate with the yieldable shoe support elevating means for varying the height of the Work support automatically in accordance with heightwise variations in the shoe bottom. The work support includes adjustable mechanism for supporting the shoe bottom upward and which will accommodate shoes of various sizes and shapes. Work masking means are provided to engage the shoe at the feather line in the area intermediate the toe and heel to define more clearly this area and prevent the roughing tool from extending the roughing operation beyond the bottom and onto portions of the upper which would be visible after the sole has been attached.

As another feature of this invention, there are disclosed alternative forms of roughing tools which comprise, generally, power driven rotatable housings from the bottom of which flexible work engaging members extend. The work engaging members are wire brushes, and in accordance with one feature of the invention means are provided for varying their angle of inclination relatively to the direction of rotation of the housing thereby to vary the degree of roughing action on the shoe bottom.

In accordance with another feature of the invention, the rotary housing, and hence the roughing members, are slidingly mounted relative to their axis of rotation and fluid means are provided to raise the housing during the roughing operating to reduce the effective pressure of the roughing members against the shoe bottom.

The above and other features of the invention including various novel details of construction and combinations of parts will now be more particularly described with reference to the accompanying drawings and pointed out in the claims. It will be understood that the particular machine and alternative constructions embodying the invention are shown by way of illustration only and not as limitations of the invention. The principles and features of this invention may be employed in varied and numerous embodiments without departing from the scope of the invention. In the drawings,

FIG. 1 is a plan view, with parts broken away, of an automatic bottom roughing machine embodying the invention; I

FIG. 2 is a side elevation of the portion of the machine shown in FIG. 1;

FIG. 3 is an end view in elevation of portions of the maphine shown in FIG. 1 with a shoe in position to be roughed;

FIG. 4 is a detail view on a somewhat enlarged scale of a roughing tool and part of its mounting mechanism;

"FIG. 5 is a sectional view in elevation of one form of roughing tool used in the machine;

FIG. 6 is a bottom plan view of the tool shown in FIG. 5;

FIGS. 7 and 8 are detail views of mechanism in the tool shown in FIG. Sffor adjusting the angle of the Wo k e n ugh ng memb FIG, 9 is a side elevation, similar to FIG 2, showing an alternative form of construction of the machine;

FIG. 10 is a perspective view of one form of work sup port used in the machine;

' FIG. 11 is a sectional view in elevation of another form ofroughing tool;

FIGS. 12 and 13 are detailed views of control mechanism for the shoe support used in the machine; and,

FIG. 14. is an end view in elevation of the variable speed power input mechanism of the machine.

Pivotal T 001 Support Referring first to FIGS. 1 to l, the illustrative machine is provided with a rotary ronghing tool suspended from and operated by an electric motor 21. The details of construction of two types of roughing tools will be hereinafter described in more detail. The motor 21 is c ahly ecure by a pair of bolts 2 (F G- 4) and a ppor n b acket, n t sho n t a p an e tends t 't e he eof s een n F G. h P st 22 i ure to a haf 24 ar ed n br ets 2r projec in up ardly rQm upp r g p a 2. The ha t 24 end ene ll h r z nta y l th se of h ma hi as viewed in FIGS. 1 and Z,

A bell crank lever 36 is fixed to the shaft 24 and has a Bowden cable 32 secured to one of its arms 33. The cable extends through an axially bored adjustable stop member 34 (FIG. 4) pivotally mounted on a post 36 projecting upwardly from the plate 28. A spring 38 is tensioned between the arm 33 of the bell crank lever 38 and the plate 2:8. Attached to opposite sides of the other arm 46 of the bell crank lever are two tension springs 42 which are also secured at their opposite ends to a portion of the machine frame (not shown).

The Bowden cable 32 extends around the machine and is joined at its opposite end (FIG. 2') to an arm 44 of a e l r nk eve p oted on a sha t 4 ar d in lugs 48 depending from a base plate 5%} on the righthand end of the machine frame as viewed in PEG. 2;, The other arm 52 of the bell crank lever carries a follower roll 54 which engages the upper face 56 of a cam 58 fixed to a vertically oriented main shaft 60. The Cam follower 54 is urged into engagement with the cam surface 56 by the tension springs 38, acting on the bell crank lever 36 and transmitted through the Bowden cable 32. As the cam 58 rotates, the bell crank lever 45, also through the Bowden cable 32, imparts a rocking movement to the tool 26 about the shaft 24 in a predetermined manner, i.e. in accordance with the profile of the face 56 of the cam 58.

Work Support The machine is provided with means, one form of which is seen in FIG. 3, for supporting, in inverted position, a last carrying a partially fabricated shoe comprising an upper U, the marginal portion M of which has been lasted inwardly over an insole I. The supporting means comprises a toe rest 62 projecting from a block 62a and engageable with the shoe in the toe region and a heel rest or support generally designated 64. The hee rest 64 comprises a block 63 which pivotally mounts a double arm lever 65. On the upper arm 65a of the lever 65 is a last pin 65b which is received within the last socket. A screw 67 is threaded in the depending arm 65c of the lever 65 and abuts the block 63. When the last has been placed on the pin 65b, advancing the screw 67 against the block 63 causes the lever 65 to pivot in a counterclockwise direction, a viewed in FIG. 3, to press the toe of the shoe against the toe rest 62. The toe rest 62 and the heel support 64 are both secured with a tight sliding fit to a bar 66 which forms part of the frame work through which rocking movement is imparted to the shoe by means now to be described with reference to FIGS. 2 and 3.

The axis of the bar 66 will be seen to extend substantially parallel with the heel-toe axis of the shoe. Bosses 68 depend from the bar 6.6 and mount pins 76 on which are pivoted the ends of parallel links 72, The opposite ends of the links 72 are pivotally connected by pins 74 (FIG. 2) to the ends of hell crank levers 7 6 which are secured to the ends of a shaft 78 extending horizontally through the machine. The lower end of the right-hand bell crank lever 76 (as seen in FIG. 3) is pivotally secured by a pin 8% to a rod 82 extending generally lengthwise of the machine. Adjusting means 84 are located intermediate the ends of the rod 82 for varying its length. The rod 82 is adjustably and pivotally secured by a bolt 86 in a slot 38 formed in the depending arm 9 of a bell crank lever 92. The lever d2 is fulcrumed on a shaft 94 supported by lugs 96 (FIG. 1) projecting from a plate 98 on which the main vertical drive shaft 60 is also sup ported. The other arm 191 of the bell crank lever 92 mounts a cam follower 102 which is engageable with the lower face 57 of the aforementioned cam 58. A spring 166 is tensioned between the lower end of the arm 99 of the lever 92 and a portion of the machine frame (not shown) to urge the follower 102 into engagement with the profile 57 of the cam 58.

Again referring to FIG. 3 and the left-hand portion of FIG. 2, the bar 66 will be seen to be supported at opposite ends by arms 108 pivotally connected by pins 109 to the upper ends of vertical supporting arms 11%.. Links 112 are pivoted at the lower ends of the arms 11%. The links 112 are also pivoted at their opposite ends by pins 114 secured to plates 116 secured to an intermediate brace 117 in the machine frame. Intermediate their ends, the arms are provided with support arms or links 118 pivotally attached thereto by bolts 12% and at their opposite ends to the plates 116 by pins 121, the arms 118 and the links 112 thereby providing a pivotal trapezoidal support for the substantially vertical arms 110.

To elevate the shoe into operative engagement with the tool and thereafter to assist in providing a substantially uniform pressure between the shoe bottom and the tool 21 as well as to assist in having the tool follow the variable contour of the shoe bottom, a pair of compressed air cylinders 124 are provided to urge the arms 110 yieldingly upwardly. The lower ends of the cylindcrs 124 are pivotally connected to a lower portion of the machine frame (not shown). Connecting rods 126 extend from pistons within the cylinders 124 and are pivotally connected at 127 to the links 112. Thus, the shoes are held upwardly against the work tool 29 by the force of the air within the cylinders 124. Operator controlled treadle mechanism hereinafter to be described is employed to control the action of the air cylinder on the work support. It will be obvious to one skilled in the art that suitably designed spring mechanism may be used as an equivalent or" the air cylinders 124.

Movable Tool Carriage Included as a portion of the main frame of the machine is a substantially hollow, elongated cast iron frame member 128 (FIG. 2). The plate 98 which, among other things, is a thrust plate, mounts the vertical shaft as and is secured to the frame member 128 near its right-hand end. The central and left-hand portions of the frame member 128 form a guideway, generally indicated 130, for a movable tool carriage 132. The carriage comprises a centerpiece 134 (FIG. 2) with four lugs 133 each mountingon a vertical axis a roller 136 (FIG. 1) engageable with the opposite sides of a central rail 13% on the guideway 130. Also on the centerpiece 134 are four depending lugs 140 each providing a horizontal bearing support for a large roller 142 and a smaller roller 143. The rollers 142 ride on the upper, and the rollers 143 on the lower surfaces of the guideway 131), respectively. Thus, there are twelve rollers, four of which support the tool carriage 132 on the guideway 130 for horizontal movement lengthwise of the machine or from left to right, as seen in FIGS. 1 and 2.

For moving the carriage 132 along the guideway 139 a bracket 144 is secured to one of the lugs 140 on the centerpiece 134, to which bracket a rod 146 is pivotally attached. The rod 146 extends substantially horizontally toward the right-hand end of the machine and carries at its right-hand end a bolt 148 adjustably and pivotally received within a slot 150 in a lever arm 152. Adjusting means 154 are located intermediate the ends of the rod 146 for varying its length. The opposite end of the lever arm 152 is fixed to a vertical shaft 156 extending through the plate 50 (FIG. 2). Also fixed to the shaft 156 is an arm 158, which, at its free end, mounts a cam follower 160. The

lever

152 and 158 are, in effect, arms of a bell crank lever, The follower 16f) engages the peripheral face of a cam 162 mounted on the main shaft 60. The follower 161) is held in engagement with the face of the cam 162 by a spring 164 tensioned between the arm 152 and a projection 165 on a depending portion of the plate 59.

The top of the centerpiece 134 on the carriage 132 constitutes a second guideway 163 (FIG. 2) which extends transversely of the machine. The guideway 168 supports a second or upper movable carriage 170. The carriage 170 will be seen to include the aforementioned plate 28 which mounts the pivotal support mechanism for the roughing tool 20. The carriage 170 also includes an undercarriage 172 having rollers 171 which roll on the sides of the guideway 168 and rollers 173 which roll on the top and bottom edges of the guideway 168. The carriage 170 is moved transversely of the main carriage 132 and, consequently, transversely of the machine by means including an upstanding bracket 174 which is secured to the plate 23. A link 176 is pivoted to the bracket 174 by a pin 178. The opposite end of the link 176 is pivotally connected at 177 to one end of a composite crank 180. The other end of the crank 184 is pivotally connected to a supporting arm 182 pivoted on a vertical shaft 184 supported on the base plate 59. The composite crank 180 is adjustably clamped to the cam 162 by a T-bolt 186 fitting within a slot 188 in the cam 162. Rotation of the cam imparts a predetermined lateral translation of the upper carriage 170 relatively to the main carriage 132 through the crank 18d and the link 176.

Drive Mechanism A horizonally oriented power input shaft 190 (FIGS. 1 and 2) is supported by bearings 192,124 on the machine frame. Between the bearings, which act as stops, is positioned a couple 196 for preventing undesirable lengthwise movement of the shaft 190. Secured to the left-hand end of the shaft 190 is a worm 198 meshing. with a worm gear 200 fixed to the main shaft 66 6 for imparting driving movement to the operating cams of the machine.

A cam 202 attached to the cam 162 on the main shaft 69 is engaged by a cam follower 204, best seen in FIG. 1. The follower is pivotally mounted on the end of an arm 2% which is fulcrumed on the above-mentioned shaft 156. The opposite end of the arm 206 is secured to a B owden cable (not shown) which is connected to a variable speed cone pulley, hereinafter to be described, to vary the speed to the input shaft 190 and, hence, the drive shaft es.

Work Masking Means It has been found that, whereas in the toe, forepart and heel regions of the shoe bottom, a clean roughing operation is readily obtainable because of the sharpness of the feather line, in the shank or midportion of the shoe it is more difficult to obtain a clean roughing operation because the feather line is not as distinctly defined. In order to effect a clean roughing operation on the shank or midportion of the shoe bottom, the machine is provided with masking means. One form of masking means is shown in FIGS. 2 and 3 and comprises a mask 20% adjustably secured in clamps 211 which are mounted on a bracket 212 supported by a post 214. The post 214 is adjustably mounted on a rod 216 which is also adjustable, being secured to the bar 66 by a sliding block 218. The mask 2% is replaceable with different masks corresponding to different styles and sizes of shoes. The mask engages the feather line of the shoe in the shank portion, as shown in FIGS. 2 and 3.

Alternative Work Support and Shoe Masking Means An alternative work support and shoe masking means are shown in FIG. 10. The alternate work support is generally similar to that shown in FIG. 3 and comprises a toe rest, generally designated 25h, masking means, generally designated 252, and a heel support, generally designated 254. The toe support 254 comprises a block 25s slidably mounted or. the bar 66 and on which is mounted a toe pad 258. Extending laterally through the toe pad 258 is a rod 269 to which is adjustably secured toe clamping means comprising two clamps 262 which are engageable with the toe of the shoe, one on either side thereof in the region adjacent the feather line. The masking means 252 is also slidably secured to the bar 66 by a block 264 spaced from the block 256 of the toe support 250. Extending laterally of the block 254 is a rod 265 on either end of which is adjustably mounted a support 268 for a clamp 27%. Each clamp is provided with screws 272 for holding a masking plate 274 in position. Thus, there is provided a pair of masking plates, arranged, one on either side of the shoe in the shank region. The plates 274 not only provide means for sharply defining the limit of the area to be roughed in the area of the shoe shank bottom as the tool operates progressively thereon, but also provide means for gripping the shoe intermediate its ends. It will be understood that ditferent sets of masking plates are provided for different size and styles of shoes to be roughed.

The heel support 254 comprises a block 276 mounted for sliding movement on the bar 66. Attached to the block 276 is a substantially U-shaped member 278 supported by stays 230. The member 278 is generally of the configuration of the heel end of a shoe'and is engageable therewith. The block 276 is also provided with clamping means comprising a recess 232 in its upper surface and a pivot pin 284 on which is mounted a pressure member 286 which fits within the recess 282. At the toeward end of the member 236 is a plate-288 engageable with the crown face of the heel portion of the last. At its heelward end the member 286 includes a bore 291) through which passes a bolt 292. The lower or unseen end of the bolt is threaded into a bore in the horizontal face of the recess 282. As the screw 292 is 7 rotated downwardly into the block 27%, its enlarged head causes the pressure member 286 to pivot about the pin 2&4 raising the plate 288 against the crown of the last, forcing the shoe upwardly into engagement with the masking plates 274 as it is pressed downwardly on the toe pad 258.

Alternative Work Support Elevating Means Alternative means which cooperate with the air cylinders 124 for moving the work support toward and away from the tool and for assisting the tool in following the general contour of the shoe bottom will now be described with reference to FIG. 9. The bar 66 has been described with reference to FIG. 2 as supported by the two upright arms 10% which are, in turn, pivotally connected at their upper ends to the raising'arms 116. In the FIG. 9 or alternative construction, the links 112 are, as in the FIG. 2 construction, pivotally connected at their left-hand ends to the lower ends of the arms lit) but at their opposite ends are keyed to the above-described shaft 114. which is supported in the bracket plates 116.

Also keyed to the shaft 114 in the alternative construction is an arm 294 provided at its lower end with a threaded boss 295 which receives a screw 2%. The screw 2% abuts an arm 29.8 which is freely mounted on the shaft 114. The lower end of the arm 2% is pivotally connected at 299 to a rod 3% the opposite endof wh ch is pivotally connected to. the lower arm 3% of a bell crank lever 3552 pivoted on a lower portion of the machine frame. The free end 3% of the bell crank 3il2 mounts a cam follower 304 engageable with the face of a cam 3% fixed to the lower end of the main shaft 6:23 which in. thi construction is longer than in the FIG. 2 construction and extends through the.frame member 128.

As in the FIGv 2 construction, the links 112 are urged upwardly by the piston rods 1% extending from the air cylinder-$124. In the PEG. 9 modification of the machine, the air cylinders 124 cooperate with the cam 306 to control the height-wise movement of the shoe supporting means as the tool 2Q follows the general contour of its bottom. As the main shaft 69 rotates, the cam follower 3% is held in engagement with the cam 306. by the pressure of the compressed air cylinders 124, on the links 112 acting through the arms 2% and 298. The arm 2%, as well as, the arm 298 are urged in a clockwise direction about the axis of the shaft 114 and, in turn, the bell crank lever 3%2 is urged clockwise with its follower 3% held in engagement with the lower profile of the cam 3%. Whereas, the cylinders 12 6 tend to urge the shoe support upwardly, the working pro-file of the cam 366; will accordingly lower the work support in a predetermined manner through the action of the arm 2% on the screw 2% in the arm 294,

Roughing Tool Referring to FIGS. 5 to 8, one illustrative form of roughing tool, generally designated 20, will now be described. The tool comprises an outer casing or housing 222 enclosing a pair of cup-like, concentric, flanged members also referred to as plates 224i, 228. A spindle 238 extends upwardly along the central axis of the casing 222 and is driven by the electric motor 21 (FIG. 3). The actual working members comprise a plurality of flexible Wire roughing brushes 232 inserted in the tool, each brush comprising bristles secured in clamps 234. Secured to each clamp is a screw 236 by which the roughing brushes are held in the casing 222. The brushes 232 normally lie substantially parallel to the axis of the spindle 230. As seen in FIG. 6, the brushes 232 are positioned equidistant from each other and. from the axis of the spindle 235 near the periphery of the casing. To accommodate the brushes, the

plates

226 and 228 areprovided with a plurality of

slots

237, 238, respectively (see particularly FIGS. '7 and 8), arranged radially of the housing. When the slots 237 in the platev 226 are in vertical alignment with the slots 298 in the plate 228, the brushes assume the position 8 shown in FIG. 7, i.e., parallel With the axis of the spindle 2 3%. However, the angle of inclination of the bristles may be varied (FIG. 8) with respect to the direction of rotation by rotating the

plates

226, 228 relatively to each other.

Relative movement between the members or

plates

226 and 228 is obtained by the movement of eccentrics 24% and 249a fixed to pins 242 and 242a, respectively. The pins 242 and 242a are provided with hex heads 242i) and 242s, respectively, to facilitate their being turned by a wrench engageable therewith through the open upper central part 223 of the casing 222. The eccentric 240a is accommodated in a slot 241 in, and thus acts upon, the plate 226 while the eccentric 249 acts upon the plate 2-28, being engageable with a slot 243 therein. An aperture 245 is provided in the plate 226 to permit passage of the pin 242a without interference with the plate. By rotating the pins 242 and 242a, the flexible bristles 232 may be made to lead or trail the direction of rotation of the tool or to stand substantially vertically, depending upon the type of material used and. the degree of roughing required.

Alternative F 01 171 of Roughing Tool Referring to PEG. ll, an alternative form of roughing tool will now be described. The tool is provided with an electric motor 21 which is operatively connected to a spindle 31d of the tool. The spindle is provided near its lower end with an integral collar 312 and below the collar the spindle is tapped to receive a nut 314. A circular plate 3E6 is clamped between the nut 314 and the collar 3.22 The spindle 310 is mounted for rotation in a bore 317 in a sleeve bearing 31% or sleeve as it is also called. An annular space 319 exists between the spindle and the sleeve for most of its length. The sleeve bearing 318 is secured to a bracket 320 attached to the aforementioned tool supporting. post 22. The sleeve bearing 33? is held to the bracket 320 between a nut 322 and a collar 324-. on the sleeve. A passageway 326 i formed in the collar 324 and communicates with the annular space 319 between the spindle 310 and the sleeve 318. An air hose 327 is connected by a fitting 323 to the passageway 326 and at its opposite end to a source of compressed air (not shown).

The roughing tool also comprises an outer casing or housing 330 provided with an open circular bottom chamher it; which the plate 316 slides. Bores 332 are spaced equidistant from each other about the periphery of the housing 330 which is substantially frusto-conical and the bores 332 are formed therein also in a substantially frustoconical configuration. Fitted in each of the bores is a work engaging roughing member comprising annular wire brushes 334, each brush being clamped in position by a set screw 336 whereby the brushes are readily adjusted heightwise and are replaceable. Integral with the outer casing 33% is an internal flanged collar 338 which is clamped on a sleeve 340 between an abutment collar 342 and a nut 344. The sleeve 349 is mounted for axial sliding movement on and rotation about the sleeve bearing 31% and rests at its lower end on the collar 312 of the spindle 310. The sleeve 34% is provided with a flange 3.4.6 at its lower end which is bored to receive a vertically extending pin 34S fixed to the plate 316 to prevent relative rotation of the spindle Sill and the housing 338 but to permit relative axial movement therebetween. When the spindle 310 is rotated by the motor 21, the outer casing 338 and thus the brushes 334 rotate with it.

Air under pressure is applied through the hose 327, the fitting 328, the passageway 326, and the annular space 319 to an interior portion or chamber 329 in the housing 334 The chamber 329 is closed by the plate 316 slidably fitting Within the opening 331 in the housing. Less than hermetic sealing occurring between the flange 346 and collar 312 permits the initial passage of a small amount of pressurized air to the chamber 329. Pressurized air therefore acts against the lower surface 339 of the flanged collar 338 creating a force to lift the housing 339 lifting the flange 346 from the collar 312 and admitting more pressurized air to the chamber 329. Thus the brushes 334 are raised relatively to the spindle 310 which does not move heightwise, being attached to the motor 21.

With the above-described mechanism the effective weight of the tool, that is, the difference between the real weight acting downwardly and the force of the air acting upwardly, can be varied by changing the pressure of the air. For example, when roughing the bottoms of mens heavy shoes, the whole weight of the tool is used and no lifting air is supplied, whereas, acting upon ladies and juvenile shoes, air pressure is applied accordingly to provide the desired light pressure and floating action between the tool and the shoe bottom being operated upon.

Variable Speed Power Input Referring to FIG. 14, the variable speed power input to the machine will now be described. A motor 349 is connected by a belt 356 to the input side of a variable speed cone pulley 352 of known type and briefly referred to above. Output power from the cone pulley is transmitted to the above-described power input shaft 190 by a power train comprising a belt 354,

concentric pulleys

356 and 358, a belt 360 and a pulley 362 fixed to the input shaft 196. Tension is applied to the bolt 354 by a weighted idler 364. The variable speed cone pulley-is provided with conventional lever operated control mechanism, generally designated 366. A Bowden cable 368 (shown in end view only) is attached to the lower end of an operating arm 370 of the control mechanism 366. The arm 370 is attached to a shaft 372 and pivots toward the viewer as seen in FIG. 14. The opposite end of the Bowden cable 368 is attached to the free end of the previously described cam operated lever 2G6 (FIGS. 1 and 2) which is fulcrumed on the vertical shaft 156. As pivotal movement is imparted to the arm 266 by engagement of its follower 234 with the earn 202, the Bowden cable causes the lever 376 of the variable speed pulley to move resulting in variable speed output from the pulley 352. Consequently, the speed of rotation of the shaft 190 and hence of the drive shaft 66 is varied in a predetermined manner in accordance with the profile of the cam 2622.

Operation The illustrative machine is operated in the following manner. The operator first makes machine adjustments in accordance with the size and style of shoe to be trimmed. The amount of movement of the tool 20 along the heeltoe axis of the shoe bottom is adjusted by varying the position of the T-bolt 186 (FIG. 1) within the slot 138 in the cam 162. The amount of movement of the tool widthwise of the shoe bottom is adjusted by varying the position of the pin 143 in the slot 150 in the lever 152 (FIG. 1). It is sometimes further required, depending on the size and style of the shoe, to adjust the amount of rocking movement imparted to the work support. This is accomplished by varying the location of the pin 86 (FIG. 2) in the slot 83 in the bell crank lever 32. The adjusting means 154 in the rod 146 controls the starting position of the carriage 132 and hence of the tool 20 relatively to the shoe.

The operator then loads into the machine an inverted last mounting a partially fabricated shoe which as described above includes an upper U, the marginal portion M of which (FIG. 3) has been lastedinwardly over an insole I attached to the bottom of the last. In the FIG. 3 modification of the work support, the toe of the shoe is first placed on the toe pad or rest 62 with the last pin 65b inserted in the last socket with the crown of the last on the member 65. The screw 67 is advanced against the block 63 to cause counterclockwise movement of the member 65 on which the last pin is mounted. The last is thus urged downwardly against the toe pad 62. The

versely of the heel-toe axis.

10 mask 208 is then moved into position at the shank portion of the shoe. To operate on additional shoes of the same size would not require readjustment of the mask.

If the alternative work support shown inFIG. 10 is used, the inverted last is mounted thereon with the toe of the shoe resting on the toe pad 258 and the clamps 262 in engagement with the shoe at the toe region. Holding the shoe so that the shank region thereof engages the masking plates 274- the operator then slides. the heel support 254 along the bar 66 toward the heel of the shoe until the heel end is engaged by the U-shaped member 278. In this position the crown face of the heel portion of the last is in engagement with the raised plate 288 of the pivot member 286. The bolt 292 is then screwed downwardly to urge the shank portion of the last upwardly against the masking plates.

As stated above, the work support is raised yieldingly into operative position by the air cylinders 124. When the machine is inoperative, the work support is held downwardly against the force of the air cylinders 124 by treadle operatedmechanism shown in FIG. 12. A treadle 386 is pivotally mounted on a pin 382 fixed to a portion 384 of the bottom of the machine frame. A cable 386 passing around pulleys 338 and 3% is attached to one of the links 112 against which the piston rod 126 of the air cylinder 124 acts in an upward direction. The treadle 386 is maintained in its depressed position, as shown in FIG. 14, by a latch 392 (FIG. 13) which is urged into locking position by a tension spring 394. In its depressed position the treadle 389, through the action of the cable 386, holds the link 112 and, hence the vertical support arms 110, and, consequently, the shoe in their lower or inoperative positions. The air cylinders 124 are allowed to move the work support into operative position by the operator squeezing a pair of hand calipers 396 on the vertical arm which, through a sheathed Bowden cable 398, withdraws the latch 392 from the treadle 330 whereupon the air cylinders 124 raises both the shoe support mechanism and the treadle.

Thereafter, the operation of the roughing tool 2% and the movement of the shoe is under the complete control of the machine, the various motions being imparted in a predetermined manner by the control cams. The action of the cam 162 through the composite lever 180 and the link 1'76 imparts motion to the upper carriage and, hence to the tool, substantially lengthwise of the shoe, i.e., along a heel-toe axis. Simultaneously, the cam 162 through the lever 152 and the rod 14-6 moves the main carriage 132 and, hence the roughing tool 2%, lengthwise of the machine and thus widthwise or trans- These cam actuated means cooperate to produce continuous peripheral movement of the tool on the margin of the shoe bottom in a path conforming to the general outline of the shoe.

The roughing tool 29 (either inthe form shown in FIGS. 5 and 6 or the type shown in FIG. 11) is pivoted on the carriage, being rocked about the axis of the shaft 24 (FIGS. 1 and 2) which as described above, extends in a direction generally lengthwise of the machine or transversely of the heel-toe axis of the shoe. This motion is predetermined and controlled by the upper profile 56 of the cam 58 acting through the bell crank lever 45 and the Bowden cable 32. This motion causes the roughing tool to follow the variable bottom of the shoe in the heel-toe direction.

The work support, and thus the shoe, is rocked about the axis of the pins 109 (FIGS. 1 and 3), which extend substantially parallel with the heel-toe axis of the shoe. This movement is controlled by the lower profile 57 of the cam 58 through the bell crank lever 90, the rod 812, the levers 76 and the links 72. Consequently, the tool follows the variable bottom contour widthwise of the shoe or transversely of the heel-toe axis.

The result of combining the two above-mentioned rocking motions also insures that the roughing tool 20 en- :gages the marginal portion M of the shoe bottom at one llocality only, i.e., at one side of the tool, and secondly, the individual elements (brushes) of the roughing tool '20, as it rotates in a predetermined direction, move from the outer edge or feather lines inwardly across the marginal portion M of the shoe bottom whereupon a roughing stroke always is from the outside of the shoe in a direction inwardly across the insole. In this manner the tool produces a progressive wiping action to the marginal portion M of the lasted upper U and at the same time avoids the possibility of lifting the lasted margin M away from the insole to which it has been attached.

The variable speed cone pulley 352 which is controlled by the shape of the cam 202 and its associated mechanism, i.e. the Bowden cable 363, etc., varies the speed with which the tool 261 operates along the toe and heel ends of the shoe bottom and correlates this speed to the speed at which it operates on the side portions thereof.

Substantially uniform pressure in holding the shoe upwardly in operative position is maintained by the two cylinders 124 urging the work support upwardly. In the alternative construction, shown in FIG. 9, the cam 306 and its associated bell crank lever 302, rod 300 and arms 2% and 298 also serve to maintain substantial uniformity of upward pressure since they control the heightwise movement of the work support during the roughing operation. This is especially advantageous when womens shoes with a sole bottom contoured to accept relatively high heels is being roughed since substantial heightwise variations are encountered. Use of the pneumatically controlled tool of FIG. 11 also cooperates to control this pressure.

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

1 A machine for operating on the margin of a shoe bottom comprising means for supporting a shoe on a last with its bottom facing upwardly, a power driven rotary tool, a carriage supporting the tool for operative engagement with the shoe bottom, first means for moving the carriage substantially lengthwise of the heel-toe axis of the shoe, second means for moving the carriage transversely of the heel-toe axis of the shoe, said first ,and second moving means cooperating to produce continuous peripheral movement of the tool on the margin of the shoe bottom in a path conforming to the outline of theshoe.

2. A machine for operating on the margin of a shoe bottom comprising means for supporting a shoe on a last with its bottom facing upwardly, a power driven rotary tool, a carriage supporting the tool for Ope ative engagement with the shoe bottom, first cam operated means for moving the carriage substantially lengthwise of the heel-toe axis of the shoe, second cam operated means for moving the carriage. transversely of the heeltoe axis of the shoe, said first and second cam operated means cooperating to produce movement of the carriage whereby the tool operates in a continuous peripheral motion on the margin of the shoe bottom in a path conforming to the outline of the shoe.

3. A machine for operating on the margin of a shoe bottom comprising means for supporting a shoe on a last with its bottom facing upwardly, a. power driven rotary tool, a carriage supporting the tool for operative engagement with the shoe bottom, first means for moving the carriage substantially lengthwise of the heel-toe axis. of the shoe, second means for moving the carriage transversely of the heel-toe axis of the shoe, said first and second moving means, cooperating to produce continuous peripheral movement of the tool on the margin of the shoe bottom in a path conforming to the outline of the shoe, and means comprising partof the said second moving means for adjusting the initial position of the carriage and hence the tool supported thereon in accordance with the size of the shoe being operated on. I

4. A machine for operating on the margin of a shoe bottom comprising means for supporting a shoe on a last with its bottom facing upwardly, a power driven rotary tool, a carriage for supporting the tool for operative engagement with the shoe bottom, a cam for moving the carriage substantially lengthwise of the heel-toe axis of the shoe, as well as transversely of said heel-toe axis, first variable length motion transmitting linkage between the cam and the carriage, second variable length motion transmitting linkage between the cam and the carriage, said first and second linkages cooperating to produce movement from the cam to the carriage whereby the tool operates in a continuous peripheral motion on the margin of the shoe bottom in a path conforming to the outline of the shoe, and means for varying the length of each linkage mechanism to vary the amount of movement of the carriage and, thus, the tool supported thereon in accordance with the size of shoe being operated on.

5. A machine for operating on the margin of a shoe bottom comprising means for supporting a shoe on a last with its bottom facing upwardly, a power driven rotary tool, a carriage for supporting the tool for operative engagement with the shoe bottom, first means for moving the carriage substantially lengthwise of the heel-toe axis of the shoe, second means for moving the carriage transversely of the heel-toe axis of the shoe, said first and second moving means cooperating to produce continuous peripheral movement of the tool on the margin of the shoe bottom in a path conforming to the outline of the shoe, and cam operated means for pivoting the tool on the carriage about an axis extending transversely of the heel-toe axis of the shoe whereby the angle between the tool and the shoe remains uniform with respect to the variable contour of the shoe bottom in the heel-toe direction.

6. A machine for operating on the margin of a shoe bottom comprising means for supporting a shoe on a last with its bottom facing upwardly, a power driven rotary tool, a carriage for supporting the tool for operative engagement with the shoe bottom, first means for moving the carriage substantially lengthwise of the heel-toe axis of the shoe, second means for moving the carriage transversely of the heel-toe axis of the shoe, said first and second moving means cooperating to produce continuous peripheral movement of the tool on the margin of the shoe bottom in a path conforming to the outline of the shoe, and cam operated means for pivoting the shoe support about an axis substantially parallel with the heel-toe axis of the shoe whereby the angle between the tool and the shoe remains uniform with respect to the variable contour of the shoe bottom across its width.

7. A machine for operating on the margin of a shoe bottom comprising means for supporting a shoe on a last with its bottom facing upwardly, a power driven rotary tool, a carriage for supporting the tool for operative engagement with the shoe bottom, first means for moving the carriage substantially lengthwise of the heeltoe axis of the shoe, second means for moving the carriage transversely of said heel-toe axis, said first and second moving means cooperating to produce continuous peripheral movement of the tool on the margin of the shoe bottom in a path conforming to the outline of the shoe, cam operated means for pivoting the shoe support about an axis substantially parallel with said heel-toe axis, and cam operated means for pivoting the tool onthe carriage about an axis extending transversely of said heel-toe axis whereby the angle between the tool and the shoe remains uniform with respect to the variable contour of the shoe bottom.

8. A machine for operating on the margin of a shoe bottom comprising means for supporting a shoe on a last with its bottom facing upwardly, a power driven rotary tool, a carriage for supporting the tool for operative engagement with the shoe bottom, first means for moving the carriage substantially lengthwise of the heel-toe axis of the shoe, second means for moving the carriage transversely of said heel-toe axis, said first and second moving means cooperating to produce movement of the carriage whereby the tool operates in a continuous peripheral motion on the margin of the shoe bottom in a path conforming to the outline of the shoe, means for operating said first and second moving means from the same input power shaft, and means for varying the speed of the input power shaft in accordance with the location of the tool with respect to the shoe perimeter whereby the tool operates progressively about the margin of the shoe bottom at a variable speed.

9. A machine for operating on the margin of a shoe bottom comprising means for supporting a shoe on a last with its bottom facing upwardly, a power driven rotary tool, a carriage for supporting the tool for operative en gagement with the shoe bottom, first means for moving the carriage substantially lengthwise'of the heel-toe axis of the shoe, second means for moving the carriage transversely of said heel-toe axis, said first and second moving means cooperating to produce continuous peripheral movement of the tool on the margin of the shoe bottom in a path conforming to the outline of the shoe, third means for pivoting the tool on the carriage about an axis extending transversely of said heel-toe axis, fourth means for pivoting the shoe support about an axis substantially parallel with said heel-toe axis, means for operating each of the said four means from the same input power shaft, and means for varying the speed of the power input shaft in accordance with the location of the tool with respect to the shoe perimeter whereby the tool operates progressively about the margin of the shoe bottom at a variable speed and the angle between the tool and the shoe remains uniform with respect to the variable contour of the shoe bottom.

10. A machine for operating on the margin of a shoe bottom comprising means for supporting a shoe on a last with its bottom facing upwardly, a power driven rotary tool, acarriage supporting the tool for operative engagement with the shoe bottom, first means for moving the carriage substantially lengthwise of the heel-toe axis of the shoe, second means for moving the carriage transversely of the heel-toe axis of the shoe, said first and second moving means cooperating to produce continuous peripheral movement of the tool on the margin of the shoe bottom in a path conforming to the outline of the shoe, and yieldable means for elevating the shoe support and .maintaining the shoe yieldingly in engagement with the tool during the operation on its bottom.

11. A machine for operating on the margin of a shoe bottom com rising means for supporting a shoe on a last with its bottom facing upwardly, a power driven rotary tool, a carriage supporting the tool for operative engagement with the shoe bottom, first means for moving the carriage substantially lengthwise of the heel-toe axis of the shoe, second means for moving the carriage transversely of the heel-toe axis of the shoe, said first and second moving means cooperating to produce continuous peripheral movement of the tool on the margin of the shoe bottom in a path conforming to the outline of the shoe, yieldable means for elevating the shoe support and maintaining the shoe yieldingly in engagement with the I tool, and cam controlled means cooperating with said the shoe into operative engagement with the tool, and means for pivoting the shoe support about said axis as the tool operates on the shoe bottom.

13. A machine for operating on a shoe bottom com prising a power driven rotatable tool, a movable shoe support for presenting the shoe to the tool with its bottom facing upwardly, said shoe support having means for clamping the shoe for pivotal movement about an axis substantially parallel with the heel-toe axis of the shoe, yieldable means for elevating the shoe support to raise the shoe into operative engagement with the tool, and cam controlled means cooperating with said yieldable means for varying the elevation of the work support as the the tool operates on the shoe to conform with heightwise variations in the shoe bottom;

14. A machine for operating around the margin of a shoe bottom comprising a power driven rotatable tool, means for moving the tool in a predetermined path about the shoe bottom, a movable shoe support for presenting the shoe to the tool with its bottom facing upwardly, yieldable means for elevating the shoe support to raise the shoe into operative engagement with the tool, and means for pivoting the tool about an axis extending transversely of the heel-toe axis of the shoe whereby the angle between the tool and the shoe remains uniform with respect to the variable contour of the shoe bottom in the heel-toe direction.

15. A machine for operating around the margin of a shoe bottom comprising a power driven rotary tool, means for moving the tool in a predetermined path about the shoe bottom, a movable shoe support for presenting the shoe to the tool with its bottom facing upwardly, said shoe support having means for clamping the shoe for pivotal movement about an axis substantially parallel. with the heel-toe axis of the shoe, means for pivoting the shoe about said axis as the tool operates on the shoe bottom,

and means for'pivoting the tool about an axis normal to the said first-mentioned axis whereby only one side of the roughing tool engages the shoe bottom at a given time and the angle between the tool and the shoe remains uniform with respect to the variable'contour of the shoe bottom. Y

16. A machine for operating around the margin of a shoe bottom comprising a power driven rotatable tool, a movable shoe support for presenting the shoe to the tool with its bottom facing upwardly, said shoe support having means for clamping the shoe for pivotal movement about an axis substantially parallel-with the heel-toe axis of the shoe, yieldable means for elevating the shoe support to raise the shoe into operative'engagement with the tool, cam operated means for pivoting the shoe about said axis as the tool operates on the shoe bottom, and means for moving the tool in a continuous peripheral motion about the shoe bottom in a path conforming to the outline of the shoe.

17. A machine for operating around the margin of a shoe bottom comprising a power driven rotatable tool having individual operating elements, means for rotating said tool in a predetermined direction, a movable shoe support for presenting the shoe to the tool with its bottom facing upwardly, said'shoe support having means for clamping the shoe for pivotal movement about an axis substantially parallel with the heel-toe axis of the shoe, yieldable means for elevating the shoe support to raise the shoe into operative engagement with the operating elements of the tool, means for pivotingthe shoe about said axis as the tool operates on the shoe bottom, means for moving the tool in a continuous peripheral mo tion about the shoe bottom in a path conforming to the outline of the shoe, and means for pivoting the tool about an axis substantially normal to the heel-toe axis of the shoe whereby the tool operates progressively about the entire marginal portion of the shoe bottom and the individual operating element of the tool move from the l feather line of the shoe bottom inwardly over the interior area of the bottom. I

18. A machine for operating on shoe bottoms compris= ing a power driven rotatable tool, a movable shoe support for presenting the shoe to the tool with its bottom facing upwardly, said shoe support having means for clamping the shoe for pivotal movement about an axis substantially parallel with the heel-toe axis of the shoe, yieldable means for elevating the shoe support to move the shoe into operative engagement with the tool, and means on the tool responsive to variable pressure for varying the force with which the tool engages the work.

1 9. A Work support for an inverted, partially fabricatedshoeon a last for presentation to a machine for operating on its bottom comprising a toe rest, at least one adjustable work mask shaped toand enga-geable with the feather line of the shoe in the area intermediate the toe and heel, and a pivotal heel support engageable with the crown of the last for urging the shoe against the toe rest and the Work mask.

20. A work support for an inverted, partially fabricated shoe on a last for presentation to a machine for operating on its bottom comprising a toe rest, at least one adjustable work'mask shaped to and engageable with the featherline ofthe shoe in the area intermediate the toe and heel, and aheel supportcomprising a pivotal member engageable with the crown of the last and screw adjusting means for pivoting said support to raise the heel end of the shoe as the toe is supported on the toe rest whereby the shoe is urged into engagement with the work mask.

21. A work support for an: inverted,.partially fabricated shoe on a last for presentation to a machine for operating; on its bottom comprising a toe rest, a heel support, at least one adjustable work mask shaped to and en gageable with the feather line of the shoe in the area intermediate the toe and heel, and a; bar mounting the toe rest, the work mask and the heel support, each for adjustment lengthwise-of the heel-toe axis of the shoe in accordance with the size of shoe being operated upon.

22. A work support for. an inverted, partially fabricated shoe on a last for presentation to a machine for operating on its bottom comprising a the rest, a heel support, at least: oneadjustable work mask shaped to and engageable with. the feather line oh the shoe in the area intermediate the toe. and heel, and a bar mounting the toe rest, the work mask and the heel support each for adjustment lengthwise of the heel-toe axis of the shoe in accordancewith the size of shoe being operated upon, and means for rocking. the work support about an axis parallel with. said; bar and said heel-toe axis.

23. tool for roughing. the bottoms of partially fabri'cated shoes having, in combination, a housing rotatable about a central. axis, flexible Work engaging members in the housing arranged in a substantially circular configuration around the. central axis and means within the housing to vary. the angle of inclination of the flexible roughing members relatively to the direction, of rotation of the housing. thereby, to vary the degree of roughing actiononrthe shoe bottom.

24. A, tool for roughing the bottoms of partially fabricated' shoes having, in combination, a housing rotatable about a central axis, roughing. members projecting from the housing comprising flexible wire brushes arranged in a. substantially circular configuration around the central axis, a. pair of plates within the housing, each plate having. slots through which the wire brushes pass, and means for rotating the plates relatively to each other to vary the angle of inclination of the flexible wire brushes 15 relatively to the direction of rotation of the housing thereby to vary the degree of roughing action on the shoe bottom.

25. A tool for roughing the bottoms of partially fabricated shoes having, in combination, a housing rotatable about a central axis, roughing members projecting from the housing comprising flexible wire brushes arranged in a substantially circular configuration around the central axis, a pair of concentric cup-shaped members will in the housing, each member having flanges extending ransversely of the central axis, the flange of each plate having slots through which the flexible Wire brushes pass, eccentric cam means for rotating the cup-shaped members relatively to each other to change the, alignment of said slots, thereby to vary the angle of inclination of the flexible wire brushes relatively to the direction of rotation of the housing whereby the degree of roughing action on the shoe bottom is varied.

26. A tool for roughing the bottoms of partially fabricated shoes, having, in combination, a housing rotatable about a central axis, work engaging roughing members in the housing arranged in a substantially circular configuration around the central axis and projecting downwardly from the housing, means for slidably supporting the housing for axial movement during rotation, and means for admitting pressurized fluid to the housing to raise the housing and thereby reduce the effective pressure of the roughing members against the shoe bottom.

27. A tool for roughing the bottoms of partially fabricated shoes having, in combination, a housing rotatable about a central axis, workengaging roughing members in the housing arranged in a substantially circular configuration around the central axis and projecting down- Wardiy from the housing, a driven spindle for rotating the housing, a sleeve bearing between the spindle and the housing for supporting the housing for rotation and for axial movement during rotation relatively to the spindle, and means for admitting pressurized fluid to the housing during rotation to raise the housing and thereby reduce the effective pressure of the roughing members against the shoe.

28, A tool for roughing the bottoms of partially fabricated shoes having, in combination, a housing rotatable about a central axis, work engaging roughing members in the housing arranged in a substantially circular configuration around the central, axis and projecting downwardly from the housing, a driven spindle at the central axis of the housing, means operatively connecting the lower end of the spindle to the housing for imparting rotation thereto, said connecting means permitting movement of the housing axially of the spindle, a sleeve hearing between the spindle and the housing for supporting the housing for rotation and for axial movement relatively to the spindle during rotation, a passageway in the sleeve bearing extending substantially lengthwise of the spindle and communicating with an interior portion of the housing, and means for admitting pressurized fluid through the passageway and into the housing to raise the housing and thereby. reduce the effective pressure of the roughing members against the shoe bottom.

Reterences Cited in the file of this patent UNITED STATES PATENTS 1,919,740 Morrill July 25, 1933 2,256,546 Brostrom Sept. 23, 1941 2,734,428 Onsrud Feb. 14, 1956 3,077,098 Pearsall et al Feb. 12, 1963

Claims

1. A MACHINE FOR OPERATING ON THE MARGIN OF A SHOE BOTTOM COMPRISING MEANS FOR SUPPORTING A SHOE ON A LAST WITH ITS BOTTOM FACING UPWARDLY, A POWER DRIVEN ROTARY TOOL, A CARRIAGE SUPPORTING THE TOOL FOR OPERATIVE ENGAGEMENT WITH THE SHOE BOTTOM, FIRST MEANS FOR MOVING THE CARRIAGE SUBSTANTIALLY LENGTHWISE OF THE HEEL-TOE AXIS OF THE SHOE, SECOND MEANS FOR MOVING THE CARRIAGE TRANSVERSELY OF THE HEEL-TOE AXIS OF THE SHOE, SAID FIRST AND SECOND MOVING MEANS COOPERATING TO PRODUCE CONTINUOUS PERIPHERAL MOVEMENT OF THE TOOL ON THE MARGIN OF THE SHOE BOTTOM IN A PATH CONFORMING TO THE OUTLINE OF THE SHOE.