US1753452A - Shoe machine - Google Patents

Description

April 8, 1930,

L. E. TOPHAM 1,753,452

SHOE MACHINE Original Filefiflarch 15', 1927 1 s eet -s et, 1

v c d a 65M 15 A April 8, 1930. Y 'E TOPHAM SHOE MAQHINE I Original Fil ed Margh 15. 1927 I 11 Sheets-Sheet a L. E. TOPHAM April 8, 1930.

SHOE MACHINE Original Filed March 15, 1927 11 Sheets-Sheet 5 April 1930- Y L. E. TOPHAM 1,753,452

SHOE MACHINE Original Filed March 15, 1927 ll Sheets-Sheet 5 'li io $10 w A & I A 4,, ///////////////////////I/I/I/II/ 1.. E. TOPHAM April 8, 1930.

SHOE MACHINE Original Filed March 15, 1927 ll Sheets-Sheet 7 L. E. TOPHAM April 8, 1930.

SHOE MACHINE Original Filed March 15, 1927 11 sheets-sh et 8 April 8, 1930. L. E. TOPHAM 2 SHOE MACHINE Original Filed March 15, 1927' 11 Sheets-Sheet 11 Patented Apr. 8, 1930.

urrs

STATES PATENT OFFICE.

LAURENCE E. TOPI-IAM, OF WENHAM, MASSACH'USETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW 3 I JERSEY SHOE MACHINE Application filed March 15, 1827, Serial No. 175,460. Renewed June 28, 1929.

the provision of an improved mechanismfor feeding the shoe, which, although particularly adapted for use in the machine herein disclosed, is not limited thereto but may be embodied in machines for performing other operations or as to'certain of its aspects may be embodied in machines in which the shoe is held and manipulated by the operator. Other features of the invention relate to a novel and improved means for coordinating the feeding movements of the work with the Various relative positioning movements imparted to the jack and operating means and broadly considered are applicable to any machine for operating on shoes in which means are provided for relatively moving the operating means and the shoe to causethe shoe to be presented properly to the operating means as the point of operation is transferred about the shoe.

The several features of the invention-consist also in the devices, combinationsand arrangement ofparts hereinafter described and claimed which, together with the advantages to be attained thereby will be readily understood by those skilled in the art from the following description taken in connection with the accompanying drawings in which Fig. 1 is a front elevation of an automatic edge trimming machine embodying the invention, the base of the machine with the jack and its actuating mechanism being omitted; Fig.2 is a right side elevation of the edge trimming and work feeding mechanisms with the parts in position to operate on the toe portion of a shoe; Fig.3 is a'view similar to Fig. 2, but a with the parts positioned to operate on the on the line 66 of Fig. Fig. 7 is a plan view of the mechanism illustrated in Fig. 5; Fig. 8 is asectional front view taken onthe line 8-8of Fig. 5; Fig. 9 is a view in right side elevation of the variable speed driving mechanism for the work feed taken on line 9-9 of Fig. 10. Fig.10 is a rear View in elevation, partly in section, of the mechanism illustrated in Fig. 9; Fig. 11 is a plan View of the electro-magnets and associated parts illustrated in Figs. '9-and-10,; Fig. 12 is a plan View of, the armatures for the electro-magnets and the pawls operated thereby; Fig. 13 is a sec.- tional elevation looking from the rear of the variable speed driving mechanism for the work feed; Fig. 14 is a right'side elevation, partly in section, on theline 1%.14 of Fig. Fig. 15 is a right side elevation partlyin section on the line 1 515 of Fig. 10; Fig. 16 is adetail sectional view takenon the line 16 16of Fig. 12; Fig. 17 is a detailplan view of certain of the connections between the pat-' 'tern cam shaft and the jack illustrating P211" ticularly the electrical contacts for controlling the variable speed mechanisms; Fig.

1 8 is a viewin rear elevation of the parts shown in Fig. 17 Fig. 19 is a side elevation of the partsshown in Figs. 17 and 18; Fig. 20

is a plan view of the lower part of themachine illustrating particularly the various mechanisms for moving and controlling the. ack; F1g.'21 1s a plan view of the variable;

speed driving mechanism for the pattern cam shaft; Fig. 22 is a sectional plan view illustrating certain parts of the mechanism for controlling the variable speed driving mechanism shown in Fig. 21 and is taken on the line 22-22 of Fig. 28; Fig. 23 is a sectional view taken on the line 28-23 of Fig. 22; Fig. 24 is a sectional view taken on the line 2424 of Fig. 22; Fig. 25 is a sectional plan view.

vation in the lower part of Fi With this construction,

taken on the line 25-25 of Fig. 23; Fig. 26 is an underneath plan view illustrating particularly the automatic switch shown in ele- 2a; 21' is a detail plan view illustrating particularly the sliding contacts in the circuits controlling the variable speed mechanisms; Fi 28 is a sectional view taken on the line 2828 of Fig. 27; andFigs. 29 to 32 inclusive are diagrammatic Views illustrating the operation of the controlling devices for the variable speed mechanisms in coordinating the feed ing movements of the work and the jack acactuating devices.

The automatic edge trimming machine herein disclosed as embodying the present invention is similar to the machine disclosed in a'pplicants Patent .No. 1,616,715, dated February 8, 1927, in that it comprises an edge trimming mechanism fixed in position as regards the transfer of the point of operation about the work, a shoe supporting jack movably supported in the machine to enable the shoe to be moved to transfer the point of operation about the shoe and to be tipped and turned to cause the shoe to be presented properly to the edge trimming tools at all points of the operation, and a pattern cam shaft, and connections between the cam shaft and jack for imparting tipping and turning positioning movements to the jack. The edge trimming cutters of the machine are arrangedand operated as in the machine of Patent No. 1,616,715, but the movable carriage in which the cutters are mounted and the means for moving the carriage to bring eith'er'cutter into operative position, are similar to the tool carriage and carriage operating means ofthe edge setting machine disclosed in appli'cants Patent, No. 1,616,? 17 dated February 8, 1927. Also the shoe sup porting jack, the means for supporting the jack in the machine, the pattern cam shaft with its driving and stopping mechanisms, and the connections between the pattern cam and the j ack are substantially the same as the corresponding parts of the machine disclosed in applicants prior Patent No. 1,616,719 dated February 8, 1927.

In the edge setting machine disclosed in appli'cants Patent No. 1,616,715, the shoe is fed to transfer the point of operation of the trimming tools along thesole edge by mechanism comprising acam on the pattern cam shaft and a series of levers and links connecting the cam with the shoe supporting jack.

difficulty was experienced in producing a trimmed sole edge having a satisfactory appearance, an uneven and irregular edge surface often resulting by reason of unavoidable.irregularities and interruptions in the feeding movement of the jack. In th'epresen't machine, this imperfection in the operation of the patented machine is overcome by the provision of a feeding mechanism acting directly on the shoe and arranged to feed the sole edge continuously and evenly past the trimming cutters. This work feeding mechanism comprises a friction roll or disk arranged to bear upon the tread surface of the outsole just inside of the line of stitches and in close proximity to the point of operation of the trimming cutter. This feed roll is continuously driven and imparts a smooth, regular movement of the sole edge past the cutter so that a smooth and even trimmed surface is produced.

The provision of a feeding mechanism acting on the shoe does away with the necessity of using a direct feeding connection between the jack and the pattern cam shaft. Vith a feed mechanism acting on the shoe, however, it is necessary in an automatic machine of this character to provide means whereby the shoe may he kept in time with the pattern cam shaft so that the positioning movements will be imparted to the shoe as certain points on the shoe are reached during the trimming operation. This result may be accomplished conveniently by the provision of means oontrolled from the shoe for varying the relative speeds of the shoe feed and the pattern cam shaft so as to maintain the shoe and the cam shaft in the proper time relation. In the illustrated machine means are provided for varying the speed of rotation of the feed roll and also means for varying the speed of rotation of the pattern cam shaft. To this end the feed roll and the patter shaft are driven through variable speed driving mechanisms and each of these mechanisms is adjustable during the operation on the shoe to impart any one of a plurality of speeds to the feed roll and to the pattern cam shaft. In the construction illustrated the variable speed driving mechanism for the feed roll is adjustable to impart three speeds to the roll which may be termed fast, medium and slow, while the variable speed driving mechanism for the pattern cam shaft is adjustable during the operation on a shoe to impart either of two speeds to the shaft which speeds may be termed fast and slow. The adjustment of both variable speed mechanisms is electrically controlled from the shoe through control circuits and connections between the pattern cam shaft and the jack acting to make and break various contacts in these circuits. The two speeds of the pattern cam shaft are each timed for a rate of feed of the shoe different from the rate of feed given by the medium speed of the feed roll, one speed of the pattern cam being timed for a slightly higher rate of feed and the other for a slightly lower rate of feed. During the operation on a shoe, therefore, the shoe tends continually either to lag behind or to lead its proper positionwith relation to the pattern cam shaft until the lag or lead is suiiicient to cause the other speed of'the cam shaft to come into operation. comparatively slight variations in the relative timing of the shoe and pattern cam shaft are thus corrected by alternate changes in the speed of the pattern cam shaft. Wider variations are corrected by subsequent changes in the speed of rotation of the feed wheel. v

In this connection it is to be noted that while in the illustrated machine mechanism for varying both the rate of feed of the shoe and the speed at which the position changing mechanism is driven are provided, each of these mechanisms, and also the means illustrated for controlling it from the shoe, em

body features of invention which are capable of use in a machine provided with but a single mechanism for varying therelative speeds of the shoe feed and the position changing mechanism. 8

Referring now to the drawings the edge trimming mechanism of the machine comprises a rotary cutter shaft 2 mounted in an adjustable carriage 4, and driven from an electric motor 6 secured to the carriage. Upon the lower end of the cutter shaft 2 are mounteda cutter 8 for operating about the foi'epart of the shoe and acutter 10 for operating along the shank and a yielding sleeve 12 provided with projections extending between the blades of the'cutter 8.

To enable ashoe to be located and held in operating position with relation to the trimming cutters, the machine is provided with a work table 14 arranged to engage in the crease between the upper and the projecting margin of the sole of the shoe. T hework table is secured to an arm 16 on the frame and is arranged to extend in front of the cutters, as shown in Fig. 1. a

A movable gage is provided as indicated at 18 for guiding the shoe to determine the distance at which the shoe is trimmed from the upper. The gage is pivotally mounted at 20 on an arm on the frame of the machine and is constructed and arranged to extend upwardly from its pivotal point to a point justbelow the work table 14so that its upper end will engage the upper of the shoe. Operating connections from a cam on the pattern cam shaft are provided for positioning the gage as the point of operation moves about the shoe.

The carriage 4 is eccentrically mounted in a bearing in a supporting ring 22 which is in turn adjustably mounted to rotate 1n a bearing formed by the arms24 on the frame of the machine. A hand operated lever 26 s provided to move the carriage 4 in its bearings to shift one or the other cutter into operating position. The lever is mounted on a stud 28 in the machine frame and is connected atits lower end by means of a link 30 to a lever arm 32 pivotally mounted at 34. A gear segment 36 is formed on the hub of the lever arm 32 and meshes with a pinion 38 fast on a rock shaft 40. An arm 42 projects from the rock shaftand operates through an adjustable link 44 connected at one end to the lever and at the. other end to a pin on the ring 22 to rotate the ring and raise or lower the" cutter shaft.

The horizontal movements are imparted to differ materially from the machine disclosed in applicants prior Patent No. 1,616,715.

The improved work feeding mechanism with whlch the machine is provided comprises a friction roll ordisk 52 rotatably mounted in a feed roll carrier 54 in a position to bear upon the tread surface of the outsole just'inside the line of stitches. A rubber tire 56 fitted to the disk is utilized as a friction work engaging surface. The carrier 54 is support ed at i'tsouter end by the bell crank lever 58, pivoted at 60 to the fixed bracket 62andconnected to the carrier by the engagement of spaced projections at its lower end with trunnions at the ends of a bearing 64'formed on the carrier as bestshown in Fig; 8. ,Thecarrier is also supported by a lever66 mounted in a pivot'6 8 on the bracket 62 through a link 70 having pivotal-connections with the lever and the carrier.

The levers 58 and 66 support the feed roll carrier 54 with the feed roll'in engagement with the tread surface of the outsole as close to the point of operation of the trimming cutters as the construction and arrangement of the roll and cutters will permit. As will be apparent from an inspection of Figs. 2

and 3, the cutter for trimming the shank is,

smaller in diameter than the cutter for trimming. the forepart of the sole and consequently the forepart cutterv overhangs the sole slightly while the shank cutter is-in operation, To enable ,the'feed roll to engage the sole close to the point of operation while each cutter is operating, means are provided for-actuating the supporting levers .58 and 66 to move the roll carrier and the roll outwardly or inwardly when a change is made in the operative position of the cutters. Also means are provided whereby movements may be imparted to the lovers 58 and 66 by the operator to raise the feed roll from, the work andto return it again into contact with the work.

Anarm projecting from the hub of the lever 66 is connected through a pivot 7 2 toone end of a lever 74 the other. end of which is connected by a link 76 to the free end of the bell crank lever 58-. The lever 74 is centrally supported on a pivot 78'between spaced proections on the lower end of a lever link which is mounted at'its upper end'to' swing V and lift the adjusting :feed disk .84 which is in turn pivotally mounted at 86 in thefixed bracket 62. On the outer end of the adjusting lever 8 1 are two adjustable screw stops 88 and 89, the stop 88 being adapted to rest against an abutment on the bracket 62 when the lever is in its lower position during the operation on the toe part of the shoe, as indicated in Fig. 2,'and the stop 89 being arranged to come in contact with an abutment 90 fixed to the cutter carriage 1 and arranged to engage the stop 89 lever 8 1 as the cutter shaft is raised into position foroperating on the shank portion of the shoe, as indicated in Fig. 3. A tension spring 92 stretched between apin on the adjusting lever 84 and a pin 94 on the fixed bracket 62 tends to hold the lever in lowered position with one or the other of the stops 88, 89 in Contact with its corresponding abutment. \Vhen the adjusting lever is raised coincident with the positioning of the cutter carriage for operating on the shank as above described the lever 74 will be turned upwardly about the relatively stationary pivot 72, and acting through the link 7 6 will swing the bell crank lever 58 about its pivot to withdraw the feed disk slightly from the cutter blades in a direction somewhat inclined from the horizontal. Similarly, as the carriage 4 is lowered to bring the cutters for trimming the toe portion of the shoe into operation the will be thrust forward to the position first described.

Normally the feed disk is held yieldingly in contact with the work but may be raised by the operator to free the shoe and may be locked in raised position. For this purpose a .hand lever :96 is mounted on the pivot 82 and is provided with a groove 98 whichslides on a locking segmentlOO concentric with the pivot 82 and formingan integral part of the adjusting lever 84:. A spring pressed plunger 102 mounted in the handle of the hand lever 96 rides on the locking segment and is adapted to enter recesses 104 at the extreme position of the hand lever at each end of the locking segment thus locking the hand lever in position with relation to theadjusting lever 84:. In order that the hand lever may readily be released from locked position, the grip 106 of the hand lever is in the form of a sleeve slidably mounted on the lhandleand fastened bya pin 108 to the rear end of the spring pressed plunger 102.

As the grip is pulled outward, the spring pressed plunger is withdrawn from its looking recess to permit the movement of the lever.

A- short lever arm 109 formed on the hub of the hand lever 96 has pivotally mounted on its iextremity the end of a rod 110 which fits into a sleeve 112 pivotally mounted at 114k on an arm of the lever 66 forsupporting the feed roll carrier 54;. A tension spring 116 96 is 1n the position shown in Fig. 3 with the short lever arm 109 in vertical position. In order to raise the feed roll and release the work the hand lever is shifted to the position illustrated in Fig. 1 forcing the rod 110 into the sleeve 112 and causing the lever 66 to turn about its pivot to raise the feed roll. At the same time the lever 74 will be turned about the pivot 78 to swing the bell crank lever 58 and withdraw the feed roll from the vicinity of the edge trimming cutters.

The feed roll 52 is in the form of a disk provided with a concaved end face to per.- mitthe periphery of the disk to engage the work close to the point of operation of the cutters. The disk is provided with a rearwardly extending hub which is journaled on a boss projecting from the inner end of the roll carrier 54. The rubber tire 56 is removably clamped to the disk by means of a clamping sleeve 117 threaded upon the outer surface of the rearwardly extending hub. The disk is secured to the inner end of the hollow shaft or sleeve 118 by means of a clamping rod 119 which extends through the sleeve and is provided at its outer end with ,a clamping washer and nut 120. The shaft 118 is journaled in the carrier 5 1 and is rotated to feed the work through a gear 122 formed thereon which meshes with a gear .124 on one .end of a shaft 126 journalled in the carrier. The shaft 126 is in turn driven through spiral gears 128 and 130 from a shaft 182 mounted in the bearing 64 and provided with a pulley 134: which is connected by a belt 136 with a pulley 138 timed to the driven member of the change speed gearing which will now be described.

The change speed mechanism through which the work feeding roll 52 is .driven in order to secure the proper coordination with the various movements imparted to the jack from the pattern cam shaft comprises a set of planetary or epicyclic gears arranged to impart to the feed roll three difierent speeds which may be designated as high. medium and low. The gears are controlled auto matically to drive the feed roll at one speed or anotherby means comprising electro-magnets. The gears and magnets are housed infa change speed gearbox which is rigidly mounted on the bracket .62 and comprises a cylinenclosing the electro-magnets.

A shaft 144 which may be designated as the drivlngshaftof the gear train is mountedina bearing 14:6 formed in one end of the and is journalled in a bearing. 150 at the.

other end ofthe casing 140. A pulley 152 is fixed to the driving shaft 144 and is connected through a belt 154 and a pulley 156 with the main driving mechanism of the machine. v e r A gear 158 keyed to turn with the driving shaft 144 and a gear 160 formed on the pee riphery of the driven sleeve 148-are held in mesh respectively with planet gears 162 and 164 rigidly mounted on Opposite ends of a shaft 166. The shaft 166 with the planet gears 162 and 164 is carried in a bearing 168 which forms an integral part of a disk 170 loosely mounted to turn on the driving shaftso that the shaft 166 and planet gears may re-' volve around the centrally placed gears with which'they are in mesh. To counter-balance v the bearing and gears weight 172 is formed on the disk 170. A Horton or over-running clutch" is provided between the planet gear carrier 170 and the driven sleeve 148 which permits the sleeve and its gear 160to turn faster but not'slower than the planet gear carrier. The clutch comprises a driving member 1'74 oosely mounted on the driving shaft 144 and keyed to turn with the planet gear carrier 170 sleeved thereon, and a driven member 17 6 fixed to the sleeve 148- Pins 178 projecting in o openings between the members of the clutch and supported on a thin disk 180 operate to lock'the members together whenever the planet gear carrier over-- takes the sleeve 148.

Assumin that the planet gear carrieris free to move idly carrying the planet gears 162 and 164 around the centralgears 158 and 160, its movement being influenced only by the interaction of these gears, the driven sleeve 148 will be retarded under the in-. fluence of its load, and the carrier responding to the various forces aoting'on the gears will revolve rapidly in the directionof rotation of the driving shaft tending to overtake the sleeve 148. At this point the Horton clutch will act to lock the sleeve and the carrier 170 securely together. t thesame time the planet gears 162 and 164 will-be locked against rotation by the gear 160 and the whole will turn as one unit to drive the feed roll at slow speed. I

In order to drive the feed. roll at high speed the planet gear carrier'170 is held against rotation so that the sleeve 148 is drivenat a speed exactly equal to the speed of the driving shaft times, the value of the gear train comprising gears 158, 162, 164'and 160. For this purpose a ratchet wheel 182 is formed on the periphery of the planet gear carrier 170 and is engaged to lock the planet gear againstfurther rotation by a pawl 184 mounted on a rock shaft 186 whch turns in fixedbearings in the base 142 of the casing for the electro-magnets.

A medium speed adjustment of the planetary transmission above described is secured by the provision of mechanism which causes the planet gear carrier 170 to rotate positively in the direction of rotation of the driving shaft 144. The speed of the driven shaft will then depend upon the speed of the carrier 170 with relation to the value of the gear train comprising the gears 158, 162, 164 and 160. This mechanism comprises an idle gear 190 mounted on a stub shaft 192 sleeved in the carrier to mesh with the planet gear 162 and with a gear 194 loosely'mounted on the driving shaft 144. A ratchet wheel 196 is sleeved tothehub of the gear 194 and is keyedzto turn with it. A pawl 198 mounted on-a rock shaft 200 journaled in the base 142 is adapted to engage the ratchet wheel and lock'the gear 194 against rotation with the driving shaft. The driving gear 158 operating through the planet gear 162, the idle gear 190 and the stationary gear194 will now cause the carrier170 to revolve in the directionflof. rotation of the driving shaft at a speed dependent on the train value of these gears. 2 P To prevent thepawls 198 "and 184 from engaging these respective medium and high speed ratchet wheelsat the same time an arm 202 is mounted on the rock shaft 186 to engage under a projection 203 formed on the pawl 198. l I r The operation rofthe pawls 184 and 198 is controlled so that one or the other is in engagement with its corresponding ratchet wheel to secure a high or medium speed adjustment or both are withdrawn for the low speed, adjustment ,by' means of two electromagnets indicated at 204 and 205.' These magnets have the same construction asthose fully illustrated and describedin applicants The fibre block rests upon the upper surface of a standard 209 rising from the base 142 and is held in position by a locking nut threaded on a rod 210 projecting upwardly from the standard through the block. Thisrod also passes upwardly through the capv 143 of the ma net casin and at its u )er end is rovided with a locking nut 211 which clamps the cap 143 in position on the base 142. The terminals of each coil are secured respectively to a core 206 and to a metallic sheath 207. An electrical connection is made to the coils through contacts engaging the metallic sheaths. The circuits for the magnets include threewires 211, 212 and 213, of which cd through a screw 215 to 'mounted to turn with "hspeed position.

the wire 211 leads to one terminal of a battery, and wires 212 and 213 to contacts in the speed controlling connections hereinafter described between the pattern cam shaft and the shoe supporting jack. The wire 211 is connected to a met-allicrod 214 mounted in the fibre block 208 and the rod 214. is connect- 2 a contact spring 216 which engages the metallic sheath of a coil of each of the magnets 204i and 205, as best shown in Fig. 11. The wire 212 is connected to a similar rod 217 mounted in the hlock 208 which rod is connected through a screw 218 to a spring 219 which contacts with the sheath of the other coil of magnet 20%.

The wire 213 connects with the other metallic sheath of the magnet 205through a binding screw 220 and similar contact spring.

Armatures 222 for the magnets are carried on lever arms one of which, indicated at 223, is mounted to turn with the rock'shaft 200 and. the other of which, indicated at 224is the rock shaft 186. .tach. of the lever arms 223 and 224 carrying the armatures are normally held in depressed position by the action of a spring pressed plunger 225 mounted in the lever and having contact with the base 14:2, as shown in Fig. 16.

The operation of the magnets to control the speed of the driven member or sleeve 148 and consequently the speed of the feed roll is clearly shown in the drawings. Fig. 9 illustrates the variable speed mechanism above described with the controls in high The electro-ma-gnet 205 has been energized to attract its armature causing the pawl 18 to engage and lock the high speed ratchet wheel. Fig. 1a illustrates the driving mechanism in medium speed position; Both magnets are inert permitting the pawl 198 to swing down into contact with the medium speed ratchet wheel 196 while the ratchet on the carrier 170 is allowed to rotate freely. Fig. 15 illustratesthe driving mechanism in low speed position. The magnet 204: has been energized to lift the pawl 198 out of engagement with its ratchet wl'iilethe magnet 205 remains inert so that both ratchets may rotate idly.

As has been stated, the shoe supporting lack of the illustrated machine, the means for supporting the ack in the machine, the pattern cam shaft with its driving and stopping mechanism, and the connections be- L tween the pattern cam shaft and the jack are.

to said patent for a full disclosure of substantially the same, as in the machine of applicants prior Patent No. 1,616,719. Accordingly, these parts of the machine will he very briefly described, reference being had the details of construction and operation. As indicated in Fig. 20, the jack comprises heel and toe supporting arms upon the upper end of the vertical spindle 22.8, which spindle at =5 its lower end is connected by means of a gimbal joint to the forward end of a horizontal arm 227. This arm constitutes a part of the jack supporting structure and is movable during the operation of the machine to impart the required tipping movements to the jack as the point of operation of the trimming cutters is transferred around the shoe. The pattern cam shaft is indicated at 228 and is provided with a series of cams which, through suitable connections, move the arm 227 to impartthe desired tipping movements to the jack. Rotary movements are imparted to the jack by means of a cam on the pattern cam shaft 228 and suitable connections to the jack including a cord indi cated at 229 which passes around a wheel at the lower end of the spindle 226. One end of this cord after passing over a guide pulley near the inner end of the arm 227 is secured to a wheel 230 which is oscillated from the cam on the pattern cam shaft, and the other end of the cord, after passing over a pulley near the inner end of the arm and over a pulley on the base of the machine, leads to a weight 232.

In the machine of Patent No. 1,616,? 19 a feeding lever is provided which is actuated from a cam on the pattern cam shaft and which is connected at its free end by means of a link to the shoe supporting jack. 1n the illustrated machine this cam actuated lever and connecting link are retained, but instead of being used to feed the ack they are utilized to control the adjustments of the variable speed mechanisms through which the shoe feeding wheel and pattern cam shaft are driven and thus maintain the shoe and the pattern cam shaft in their proper time relation, a'lost motion connection being provided between the arm and the link. This lever, see Fig. 20, is indicated at 238 and is pivotally mountedso as to swing in a horizontal plane and is connected at its forward end through a lost motion device, hereinafter described, and the link 240, to the toe supporting arm of the jack. The lever 288, which may be termed a control lever, is connected by means of links 2&2 and 244 to one arm of a lever 246, the other arm of which engages a cam on the pattern cam shaft. The links'22 and 244 are pivotally connected together and to the rec end of a swinging guiding link 248. The link 248 is fulcrumed upon a lever 250 which is held locked in position during the operation on a shoe. To adapt the machine for op oration on shoes'of different sizes, the lever 250 is pivotally mounted upon the machine base so that it can be adjusted to change the position of-the fulcrum of the swinging guiding link 24:8. The fulcrum carrying lever 250 is held locked in adjusted position during the operation on the shoe by mechanism comprising a rod 252 piv-otally connected to the rear end of the fulcrum carrying level 250 and arranged to slide in a block pivotally mounted 264 to one-arm of a lever 266, the hubof which is' arranged to be engaged by a latch 268. During the operation ona shoe, the lever 266 is held by the latch 268 and the fulcrum carrya ing lever 250 is locked in position. The placing of anew shoe on the jack acts to release the lever 266, as fully explained in Patent No. 1,616,719 above referred to, so that the fulcrumcarrying lever 250 is unlocked, and adjustment of the mechanism for actuating the feed lever can be made by the movement of the jacked shoeto starting position in the machine. The fulcrum carrying lever 250 is locked in position on starting the machine by means ofapin 270 on a horizontally arranged bar 272, which pin as the bar is moved to the right, swings the lever 266 until it is engaged by the latch 268. The bar 272 is a part of the starting mechanism and is connected by means ofa bell crank lever and connecting rod to the starting treadle of the machine.

The pattern cam shaft is driven (see Figs. 1 and 20) from an electric motorthrough suitable gears and a vertical driving shaft 273 which is connected by means of a variable speed mechanism to the sleeve gear 275 which inturn operates through a series of reduction gears to drive the pattern cam shaft, the construction being the same as that disclosed in Patent No. 1,616,719.

The bar 260 of the mechanism forlocking and unlocking the fulcrum carrying lever of the jack feed mechanism is also utilized in the samemanner as in the machine of Patent No. 1,616,719, to adjust the speed of the pattern cam shaft in accordance with the size of the shoe'to be. operated on, thelever 262 to which one end of the bar 260 is connected, acting when moved in either direction, to shift the'adjustable'cam plate 274 of the variable speed mechanism through which thepattern cam shaft is driven. This cam plate is pivotally mounted at one end on the machine frame and at the other end has a gear toothed connectionwith an arm 276 on a rock shaft 278 which carries on its lower end an arm 280 pivotally connected at 282 to the lever 262. When actuated by the bar 260 the lever 262 turns about its pivot 284 causing the arm 280 and rock shaft- 2'? 8 to turn and position the adjustable cam plate 274 to produce the desired speed. The lever 2.62 is moved into the properposition by a longitudinal movement of the bar 260 imremote from the lever 262, the engagement taking place during the forward movementof the bar 260 as the machine is started into operation bythe depression of the starting treadle. o v i As has been stated the illustrated machine is provided with means whereby further adj ustment of the variable speed mechanism may be made to cause the pattern cam shaft to bedriven at either of two speeds which may be termed fast and slow in order to maintain the proper time relation of the shoe and the pattern cam shaft. To secure this adj ustment the pivot 284 of the lever 262 ismount ed'in the outer'end of an arm 286. the inner end of which is formed as an exce'ntric strap 7 The sleeve 2 96 is enlarged at its lower end. I

to form the driven member of a roll clutch. Vertically arranged, rolls are located in widened portions 300 of the channel formed between the sleeve 296 and the sleeve 298 and are spaced by segments 302 'projectinginto the channel from a disk 304. The. disk 304 is loosely mountedon the sleeve 298 between the sleeve 296 and a washer 306 which forms a lower end bearing for the parts mounted on the shaft 273. A spring 308 stretched between a pin on the driven member 296 and a pin on the disk 304 tends to turn the disk in the direction of rotation to lock the clutch. Normally, however, the clutch is held in open position with the driven member 296 at rest by the engagement of a projection 31-0 on the disk 304 with the detent lever 312 fulcrumed at 314 on the machine frame. To adjust the variable speed mechanism from the fast or slow'speed to the other the detent lever 312 is moved momentarily out 10f engagement with the projection 310 permitting the clutch to lock and turn the driven member 296 through one complete revolution when the projection 310 again comes into engagement with the lever 312. The rotation of the driv enmember 296 acting through gear 294 operates to turn the gear 289 and theexcentric 287 through one half revolution so that the arm 262 is swung about itsconnection with the bar 260' to alter' the j ustable cam plate 274. 7

- The detent lever 312 is moved away from the projection 310 to alter the adjustment of the variable speed mechanism by means of an electromagnet 316 arranged to act on an armat1'1re318 forming an integral part of the lever 312. A compression spring 320 inserted between an arm 323 on the lever 312and position of the ada point on the frame tends to swing the lever ismounted on the pivot 328 and carries a cam roll 332 which is adapted to ride in the eccentric cam groove 334 formed in the under side of the gear 289. As shown in Fig. 22, the parts are positioned to give a high speed adjustment, the arm 262 being swung to the right and the switch bar 326 being in contact with the contact point 324. When the pattern cam shaft is to be slowed down an electric circuit is closed through the contact point 324 as will be hereinafter described, energizing the magnet and causing the lever 312 to disengage the projection 310. As the eccentric 287 and the gear 289 carrying the cam 334 rotate the switch bar 326 is swung to the left breaking the circuit and allowing the lever 312 to swing back under the influence of its spring 320 into the path of the projection 310 so that the driven member 296 is permitted to turn but one complete revolution and the eccentric 287 and gear 289 a corresponding onehalf revolution. Similarly when an adjustment from low to high speed is to be made an electric circuit is closed through the contact point 322, and the eccentric and gear are moved through another one-half revolution to their original position.

To prevent the continuation of the current flow in case the machine stops with the cir- Or I cuit of the control magnet 316 closed, a switch is provided in series with the electro-magnet 316 which permits a current to flow through the magnet only while the machine is in op eration and acts automatically to break the circuit when the machine is stopped. This switch comprises a cup shaped member 336 keyed to the lower end of the driving shaft 273, and an insulating block 338 mounted inside the cup. A bar 340 is rigidly secured to the block and has pivoted thereto a lever 342 which carries on its free end a weight 344. The weight is adapted to ride against the rim of the member 336 but is normally held out of contact with the rim in a recess in the block by means of a tension spring 346. During the operation of themachine the rotary movement of the driving shaft 273 will'cause the lever 342 and weight 344 to swing outward against the tension of the spring 346 and make contact with the rim. The lever 342- is connected-with one terminal of the electro magnet 316 through a contact spring 352 which bears against the bar 340 and is mounted on an insulating block 354, a wire connecting the spring with a binding post 355 and a plate: ontheinner: end of the binding post engaging the metallio' sheath of one of the magnet coils.v The magnet has the same construction as the magnets 204 and 205 previously described and its other terminal is connected to a battery or other source of power through a plate 359 engaging the sheath of the other coil of the magnet, a post 361 to which the plate is secured and a socket contact pin 363. While the weight 344 is in contact wit-h the rim 336 the current will pass into the magnet through one of the contact points 322 or 324 by way of the switch bar 326 and through the machine frame to the rim 336, and thence by connections just described to the magnet. hen the machine is stopped the spring 346 will act to swing the lever 342 and weight 344 away from the mm 336 to break the circuit.

As has been stated, the connection between the jack feeding lever 238 and the link 240 which lead to the toe of the jack is constructed in such a manner as to permit a certain amount of lost motion between these parts and this lost motion is utilized to make and break the circuits of the control magnets 0f the variable speed mechanisms for driving the feed wheel and pattern cam shaft and thus regulate the relative speeds of the two mech anisms. The link 240 is connected through a universal joint to a small lever 356 pivotally mounted at 358 on the control lever 238. The movement of the lever 356 is limited by the engagement of a screw 360 on the feeding lever with the ends of a slot 362 in a flange 364 formed on the lever 356. A spring contact plate 366 is mounted on the lever 356 and is adapted to oscillate'with the lever 356 be tween two pairs of contact points 368, one pair being mounted above the other on an insulating bracket 370. The contact points of the lower pair are positioned so that a small movement of the lever 356 will bring the contact plate 366 into contact with one or the other, a further movement of the lever being required to engage either of the contact points in the upper pair.

As indicated in the diagrammatic views, (Figs. 29 to 32 inclusive) the two lower contact points 368 are in electrical connection respectively with the contact points 322 and 324 of the change speed'mechanism for driving the pattern cam shaft while the contac points 368 of the upper pair are in electrical connection respectively with the electromagnets 204 and 205 of the change speed mechanism for the work feeding mechanism. The contact plate 366 is in electrical connection with one terminal of the battery or other source of power indicated at 372 the other terminal of which is connected to all three magnets 204, 205 and 316.

Sliding contacts are provided to carry the current from the wires in the jack feeding lever 238 to corresponding wires mounted on the fixed portions of the machine. For this purpose a short arm 374 is formed on the hub of the control lever 238 and carries fivecontact plates 376 one for each wire curved concentrically, with the fulcrum of the lever and embedded in an'insulating medium378 on the under side of the lever arm 374. Corresponding to the contact plates 37 6 are aseries of sheet metal conductors 380 properly insulated and fixedly mountedin the. machine each conductor carrying a spring pressed "plunger 382 adapted to bear against a corresponding contact plate 37 6.

The operation of the mechanism for coordinating the relative speeds of the pattern cam shaft and the work feeding mechanism will be readily understood from. an examination of the diagrammatic views Figs. 29 to 32. As illustrated in Fig.29, the work is too far in advance of the pattern cam shaftand the contactplate 366 has swung as far as possible to the right resulting in a high speed adjustment. of the pattern cam mechanism and a low speed adjustment of the work feed. As illustrated in Fig. 30, the pattern cam shaft has begun to catch up with the Work and the spring contact plate 366 has been permitted to swing partially back toward its central position. The effect of this has been to'break the circuit through the magnet 204 to bring the work feed to medium speed, and thu to cause the pattern cam shaft to overhaul the work less rapidly.

The further relative advance of the pattern cam shaft causes the contact plate 366 to iswing still further to the left shifting the pattern cam mechanism-to slow speed while the work feed remains at med um speed as illustrated in Fig. 31. The pattern cam-shaft and the work should now move at such relative speeds as to cause the work to lead instead of lag behind the cam shaft. If, however for any reason the work still continues to move at a speed which causes it to lag, behind pat tern cam shaft the plate 366 will continue its -1novemen-t to the left until it reaches its extreme position as indicated in Fig. 32. f This will bring the work feed to high speed while the pattern cam shaft continues to rotate at slow speed which will produce a relative movementof the pattern cam shaft and'work to cause the contact plate 266 to begin its swinging movement towards the right. During the ordinary operation of the machine the work feeding mechanism will remain at mejCllllm speed and the pattern cam mechanism will be shifted from low to high and from high to low speed as the shoe tends to lag behind or lead the pattern cam shaft. Under unusual conditions and whenever a change in the speed of the pattern cam shaft fails to overcome the lagor lead of the shoethe low or high speed of the work. feed mechanism will be b'rought into action and the shoe and the pattern cam shaft quickly returned to theirnormal relative position.

The nature and scopeof the present inven tion having been indicated and a machine embodying the invention having been specifically described, What is claimed is;

operating position, a work feeding roll mak-' lng contact with'the bottom of the shoe sole to feed the shoe past theed ge trimming devices, and means for adjusting the position of the feed roll .-as one or the other tool is moved into operative position.

3. A shoe edge trimming machine having,

in combination, edge trimming devices comprising a cutter shaft, a forepart edge tool and a shank edge tool mounted on the shaft, means for moving the tools alternatively into operating position, a work feed roll making contact with the bottom of the shoe sole to to feed the shoe feedthe shoe past the edge trimming devices, 7

and means controlled by the edge trimming devices for adjusting the position of the feed roll as one or. the other tool is moved into operative position.

fl. A shoe edge trimming machine having, in combination, edge trimming devices, a shoe supporting ack, mechanism for changing the relative work feeding roll making contact with the bottom of the shoe sole, and means for rotating the roll to feed the shoe'past the edge trimming devices.

positions of the jack and the edge: trimming devices to present theshoe properly to the edge trimming devices as the point of operation is transferred about the shoe, a

. 5. A machine for 'operatin g upon shoes having, in combination, devices for operating upon a shoe, a shoe supporting jackmovable to transfer the point of operation about the shoe, a work feeding roll making contact with the bottom of the shoe sole, and variable speed gearing for rotating the roll.

6. A machine for operating upon shoes having, in combination, devices for operating upon a shoe, a shoe supporting jack movable to transfer the point of operation about the shoe, a feed roll acting on the shoe, variable speed gearing for imparting a continuous rotation to the roll, and means for adjusting said gearing to drive the roll at different speeds.

7 A shoe edge trimming machine having,

' in combinatiomedge trimming devices, a shoe supporting jack,a Work feedmg member mak-

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