US2319274A - Machine for applying pressure to soles and shoes - Google Patents

Description

May 18, 1943 F. E. STRATTON MACHINE FOR APPLYING PRESSURE TO SOLES AND SHOES Filed July 24, 1940 'T Sheets-Sheet 1 WVEA/TU/P. M ism a; Z; 'M g May 18, 1943 F. E. STRATTON MACHINE FOR APPLYING PRESSURE TO SOLES AND SHOES 7 Sheets-Sheet 2 Filed July 24, I940 y 3, 1943 F. E. STRATTON 2,319,274

MACHINE FO R APPLYING PRESSURE TO SOLES AND SHOES Filed July 24, 1940 7 She ets-Sheet 3 ivmvrm $425M May 18, 1943 MACHINE FOR APPLYING PRESSURE T0 SOLES AND SHOES F. E. STRA'ITON Filed July 24, 1940 1 Sheets-Shoot 4 y 1943 F. E. s'rRAT'roN 2,319,274

MACHINE FOR APPLYING PRESSURE'TO. SOLES AND SHOES Filed July 24, 1940 7 Sheets-sheaf. 6

Wvavma is/am y 13, 1943 F. E. STRATTON $319,274

MACHINE FOR APPLYING PRESSURE T0 SOLES AND SHQES Filed Jui 24, 1940 '7 Sheets-Sheet 'r WVENTUR FM .2. 5M 2 1 Patented- May 18;

MACHINE FOR APPLYING PRESSURE T SOLES AND SHOES Frank E. Stratton, Beverly, Masa, assignor to United Shoe MachineryCorporation, Borough of Flemlngton, N. 1., a corporation or New Jersey Application July 24, 1940, Serial No. 347,174

89 Claims. (01. 12-37) This invention relates to machines for use in applying pressure to shoe bottoms such, for example, as machines for cement attaching soles to shoes. The invention is illustrated, by way of example, as embodied in a turret type machine adapted for use in applying either sole laying or sole attaching pressure to shoe bottoms, the machine being provided with a plurality of work receiving units which consist of pads arranged for the reception of soles and shoes.

It is an object oi. this invention to provide an improved means for intermittently operating the conveyor, which in the illustrated machine consists of the rotatable turret, and controls for said means. As illustrated, the improved operating means consists oi. a multicylinder fluid motor which is arranged to move with the turret and intermittently to rotate the turretsuccessively to bring the pads to a loading station. The operation of the fluid motor is re I ated by a control device which is arranged to control the. exhaust of pressure fluid imm the different cylinders of the motor, and, as a further aspect of this i'eature oi the invention, the control device is also arranged to admit pressure fluid'to the cylinders in the exhaust position while the turret s at rest so as to equalize the pressure in all the cylinders at this time and render the motor inoperative.

It is a further object of this invention to provide an improved means for initiating the operation of the conveyor. To this end, the control device for the motor which operates the turret is coupled with the pad at the loading station by mechanism which urges the control device toward the motor operating position when a sole and shoe are pressed against the pad at the loading station. As illustrated, the control device comprises a shiitable member which is urged toward a motor operating position by a pressure-responsive member which is in turn coupled with a pressure-applying system associated with the pad at.

the loading station. In accordance with one emhodiment of this feature of the invention, regulating means are provided for the pressure-responsive member and are arranged to prevent the operation of the pressure-responsive member until the pressure on the sole and shoe on the padbe arranged to urge the control device toward.

- hydraulic system for operating the machine.

in the high-pressure system reaches a predetermined level. I

In the illustrated machine, the work is pressed against the pads by means including a piston having a small sectionand a large section which are received respectively in a small chamber which is connected to a source of pressure fluid, and a large chamber which is supplied with pressure fluid from the small chamber. Upon the release of the pressure acting on the piston, the pressure fluid in the large chamber normally escapes through an escape port in the large chamber which is uncovered at that time by a springoperated valve. In accordance with another fea- "ure of this invention, further means are provided for permitting the escape of the pressure fluid from the large chamber in the event that the spring-back valve fails to uncover the escape port when the pressureis reduced. As illustrated, this means consists of a passageway arranged to permit the escape of the pressure fluid from the large chamber, and a valve located in that passageway and arranged to open in the event that the spring-operated valve fails to uncover the escape port.

Invention is also to be recognized in the means for automatically disconnecting the operating 1ever from the fluid motor control valve during the rotation of the turret thereby to permit the valve to move independently of the operating lever and stop the movement of the turret at a predetermined time regardless of whether or not the operating lever has been returned to its inoperative position; in the arrangement of the fluid-operated means for controlling the sole and shoe locating gages and for biasing the shoe engaging members towards an operative position after the sole and shoe have been properly located by the gages; in the guiding means for causing the pistons which apply pressure to the sole and shoe to move in a predetermined path; and in the control means for regulating the operationof the valve which controls the flow ofpressure fluid to the piston which qforces the sole and shoe against the pad.

With the above and other objectsin view, the

invention will now be described in connection with the accompanying drawings and thereafter pointed out in the claims.

In the drawings,

Fig. 1 is a perspective view of a machine embodying this invention;

Fig. 2 is a vertical section through the machine chine taken on line II-II of Fig. 5, some of the parts being broken away to show details of the underlying structure;

Fig. 3 is. a vertical section taken substantially along the line III-III of Fig. 2 looking in the direction of the arrows, the indexing control mechanism being omitted;

Fig. 4 is a view on an enlarged scale of a typical rotary valve used for controlling the indexing and gage operating systems;

Fig. 5 is a horizontal section through the machine taken on line V-V of Fig. 2 looking in the direction of the arrows;

Fig. 6 is a vertical section on an enlarged scale taken along the line VIVI of Fig. 5 looking in the direction of the arrows;

Fig. 7 is an angular view on an enlarged scale of the indexing valve control mechanism shown in the lower right portion of Fig. 5;

Fig. 8 is a vertical section on an enlarged scale taken along line VlJI--VIII of Fig. 5 looking in the direction of the arrows;

Fig. 9 is an elevation of the opposite end of the valve construction shown in Fig. 8;

Fig. 10 is a diagrammatic illustration of the hydraulic system embodied in the illustrated machine, the sections V.-V, XIIX]I and XIII-XIII being taken along similarly designated lines in Fig. 2 and showing the post turned 90 in a clockwise direction from its position in Fig. 5; while section XIV-X[V is taken along the line of that designation in Fig. '7, and sections XVXV, XVI-XVI, XVIIXVII, and XVIII-XVIH- are taken along lines of those designations in Fig. 5; and

Fig. 11 is a section taken along line XI-XI of Fig. 2 looking in the direction of the arrows.

Before describing the machine in'detail a brief description will be given of its operation. The operator first places an unattached sole on the pad and) then depresses the left treadle I10 which causes the sole locating mechanism accurately to position the sole on the pad. The operator next places a shoe on the sole, locating it with the aid of the gages and then moves a pair of balls 10 over the shoe and depresses the right treadle 360 which causes the balls to press the shoe into the pad. As the shoe is pressed into the pad'the locating mechanism is automatically moved away from both the sole and the shoe. The operator now indexes the machine by depressing a hand lever 350 which causes the turret head to rotate through 90 and bring the next pad to the loading station. As the next pad moves toward the loading station the pressure fluid, which causes the bails to press the shoe into the pad, is automatically released and the bails are raised from the shoe so that the operator can remove it. from the pad imme-' diately after thepad reaches the loading station and repeat the loading operation described above.

The illustrated machine comprises a circular base In (Fig. 2) having an upstanding wall I! which forms a supply tank or reservoir for the pressure fluid, preferably 011, used in the operation of the machine. Projecting from the central portion of the base is a raised platform l4 to which a post I6 is secured by bolts I. The

platform is provided with openings IS in its side der formed in the lower part of the post while above the treadles.

the upper end of the column is positioned with respect to the post by a roller bearing 26 which is seated on a shoulder formed on the post adjacent to its upper end. The column 22 is made up of a lower part 28 which is constructed to function as a manifold and to control the operation of the machine in a manner which will hereinafter be described, and an upper portion 30 which depends from the head 20 and is fastened to the manifold by bolts 32.

The head 20 has formed therein four radially extending recesses 33 located 90 apart, which are normally covered by plates (Fig. 1). Mounted in the recesses 33 are a like number of cylinders 34, 36, 38, 40 (Fig. 10) of a fiuidoperated motor which rotates the turret successively to bring the pad boxes to the loading station which is in the front of the machine In the cylinders are pistons 42 (Fig. 2) which are connected by connecting rods 44, 46,48 and 50 (Fig. 10) to a collar 52 which is rotatably mounted on a stationary pin 54. The pin 54 is located eccentrically of the center of the fixed post [6 and is mounted on a collar 56 which is fastened to the post by a key 58. The turret is rotated by successively exhausting two of the cylinders, allowing the other two cylinders to rotate the turret by pushing against the fixed pin 54. The mechanism for controlling the operation of the fluid motor will subsequently be fully described.

Mounted on the turret head between the cylinder receiving recesses are four pad boxes 64 (only one of which is shown in Fig. 1 for sake of clarity) which are successively brought to the loading station opposite the tray 62 (Fig. l) by the rotation of the turret. The pad boxes are provided with pads 65 which are preferably of the type disclosed in Letters Patent of the United States No. 2,205,400, granted June 25, 1940, on anapplication filed in the name of Sidney J. Finn, while the shoe and sole locating mechanism is of the type disclosed in Letters Patent of the United States No. 2,262,759, granted November 18, 1941, on an application filed in the name of Sidney J. Finn.

The construction of the shoe pressing means associated with each pad is the same, so only a typical construction such as is shown in Figs. 2

and 3 will be described. When a shoe and a sole are properly located on the pad 65 at the loading station, the shoe is pressed into the padby members 66, 88 (Figs. 1 and 3) which engage, respectively, the top of the cone of the last and the forepart of the shoe. The members are mounted on heightwise movable bails each consisting of a crosshead I0 and apair of downwardlyextending pivoted arms 12, 14 located on opposite sides of the pad. The bails are connected with each other by racks 16 which are fastened to the inner arms 12 and mesh with a pinion I8, so that movement of one of the balls is transmitted to the other and causes an equal and opposite movement of the other bail. The arms 14 on the side of the pad a sole and a shoe on the pad. The upper ends of the bails are urged. away from each other, by springs 88 (Fig. 3) which are connected to the lower ends of the arms below their pivots.

When a shoe has been properly located on the pad, it is pushed against the pad by, a piston 82 (Figs. 2 and 3) located in a cylinder 84 which is fastened to the turret head beneath the pad. The piston is connected to the lower ends of the bail arms 12, I4 by equalizing levers 86 which are fastened intermediate their ends toa shaft 88 and at their opposite ends rotatably receive rods 89 which 'are fastened to the bail arms. The shaft 88 is mounted in alined openings 89 formed in spaced ears 98 depending from a plate 92 which is bolted to a shoulder 94 that extends inwardly from the skirt portion of the piston 82. Located centrally of the plate 92 is a segment 96 having a downwardly facing wedge-shaped surface which lies between the sides of a complementally shaped groove formed on the periphery of a segment 98 keyed to the shaft 88. The alined openings 89 in the flanges 98 are larger in cross section than the shaft 88, and the shaft is normally held against the bottom surfaces of those openings by a pair of spring-backed plungers I88 (Fig. 2) slidably mounted in'openings formed in the upper portions of the ears 90; the plungers acting on the equalizing levers 86 which are mounted on the ends of the shaft 88. While the shaft is held in the bottom of the openings 89, the members 95 and 98 are separated, as shown in Fig. 2. so that the shaft 88 can rock back and forth. Thus. when the bails are moved downwardly. the member 66 or 68 which first engages the shoe will rock 'the shaft 88 until the other member engages the shoe with an equal pressure. After ths initial equalizing adjustment, the springs which back the plungers I88 yield, allowing the wedging surfaces on the members 96, 98 to contact each other and lock the bails to the piston during the period b when substantial pressure is applied to the shoe.

The piston 82 is, broadlv, of the quick-acting type disclosed in Letters Patent of the United States No. 2,231,963,- granted February 18, 1941, on an application filed in the name of Frank E. Stratton. This piston has a head I82 (Fig. 3) located in a small chamber I84 and a lower shoulder I 86 having a relatively large pressure receiving area located in a large chamber I88. It will-be noted in passing that two separate pistons arranged in the manner disclosed in the above-mentioned Stratton patent can be used in the place of the single shouldered piston disclosed herein. Thepiston is forced downwardly in the cylinder by the delivery of pressure fluid through a pipe I85 to the relatively small chamber I84. The pressure fluid is supplied by a rotary pump I58 (Fig. 5) which draws the fluid from the reservoir through a strainer I52 and a pipe I54 and forces it through a pipe I56 to a rotary valve I 58. From the valve the fluid 'is led through a pipe I68 to a riser pipe I62 (Fig. 2) in the stationary post I6, whence it passes through a port I64 to a chamber I66 (Fig. in the upper part of the manifold and out through the pipe I85.

The chamber I84 is quickly flllediafter which the pressure fluid rapidly forces the piston downwardly until the members 66, 68 engage the shoe. As the piston is moved downwardly, the displacement of its shoulder I86 causes fluid to be drawn up from the reservoir, through a pipe H8 in the post I6 (Fig. 2), a manifold opening H2, and a pipe II4 which opens onto a port I I8 (Fig. 3) in a I head portion I82 of the piston will have moved down far enough to uncover a passage I28, al-' lowing the pressure fluid to flow from the small chamber I84 into the passage and to act on a sleeve valve I22 which is held by a backing spring I24 against a port that opens onto the large chamber I88. When the pressure builds up sufficiently to overcome the backing spring I24, the valve I22 is moved downwardly until it seals the port leading into the passageway H8, at which time openings I 26 in the valve sleeve are uncoveredin the chamber I88, allowing the pressure fluid to flow into the chamber I88 and build up pressure there which will act on the shoulder I86 of the large piston as well as on the small piston I02 and force the shoe into the pad.

After being loaded, the pad rotates with the turret head I2 until it again nears the loading station, when the pressure fluid acting on the piston 82 is released, at which time the piston is ra sed to move the bails away from the shoe by the action of a pair of heavy springs I28 Fig. 2) which are connected respectively to the turret head and to the ends of a bar I38 mounted in the lower portion of the flanges 98. When the pressure in the chamber I88 is reduced the spring I24 ra ses the valve I22 and uncovers the passageway II8 allowing the fluid in the chamber I88 to escape rapidly down that passageway so that it operated upon, while it may be only slightlycracked when a very largev shoe or one of an extremely high heeled style is operated upon. In the latter cases, it has been found that, occasionally, when the pressure fluid is released." from the cylinder, the heavy springs I28 raise the piston so rapidly that the passage I28 is closed before the backing, spring I24 can lift the valve I22 from its seat and permit-the fluid in the chamber I88 to escape through the passage II8, with the result that the fluid in the chamber I88 is trapped there and prevents further upward movement of the bails. This difliculty is overcome by providing the piston I82 s with a passage I31 (Fig. 3) which connects the chamber I88 to the chamber I84. The passage is sealed against thedownward passage of fluid from the chamber I84 by a, ball valve I 38. Thus, in the event that pressure fluid is trapped in the chamber I88 after the pressure has been released from the chamber I84, the upward pressure of I38 lifts it from its seat, allowing the pressure fluid in the chamber I88 to escape through the passage I31 until the pressure in the chamber I88 has been reduced sufficiently to permit the spring I24. to raise the valve I22 and allow the remaining fluid to escape down the passage H8.

The piston is guided in its heightwise movement by a depending plate I32 (Fig. 2) having an elongated slot I34 in which slides one end of the bar I30. The guide plate I32 prevents rotation of the piston which would otherwise cause the bail arms 12, 14 to bind against the sides of the slots I36 in the turret head through which they move.

When the bails are in their inoperative positions (Fig. 3), that is, when they are moved away from each other so as to uncover the pad, the members 66, 68 overlie the gage mechanism, and if the piston were accidentally operated to its full extent at this time, the members would be forced downwardly against the gage mechanism and might cause considerable damage. To prevent this, the bail arms are provided with lugs I39 which lie above the surface of the turret head when the bails are in their up position (Fig. 1), and when the balls are in their inoperative position, lie slightly above shoulders I40 which surround the rear parts of the slots I 36.

If the pressure fluid is accidentally admitted to the chamber I04 when the bails are in this position, the lugs I39 will strike the shoulders I40 and will stop the downward movement of the piston before the small head I02 uncovers the passage I20. As the force exerted by the pressure fluid on the small head I02 is relatively small, the lugs will hold the piston in this position until the pressure fluid is released from the cylinder. Another advantage of this feature lies in the fact that it enables the operator to send one or more of the pads around the machine empty, as all that he need do to operate the machine in this manner is to make sure that the balls are in their inoperative positions, admit fluid to the chamber I04 so as to move the pins I39 into engagement with the shoulders I40, and then index the machine to bring the next pad to the loading station,

The forward portions of the slots I36, that is, the portions of the slots which underlie the lugs I39 when the bails are moved to a position where .they overlie the shoe, are made enough wider than the openings in the rear portions or the slots which are surrounded by the shoulders I40 so that the lugs I39 can readily pass through the slots when the balls are moved downwardly to press a shoe against the pad.

When a sole is placed on the pad 64 at the loading. station, it is positioned thereon by locating mechanism of the type described in the above-mentioned Finn Patent No. 2,262,759, which is operated by the treadle I10 through a control system which will now be described. The treadle is connected to a valve operating pawl I14 (Fig. 6) by a rod I12 which extends through an open ended --pipe I16 threaded into an opening in the bottom of the reservoir and through an opening in the underlying treadle; the portion of the rod extending below the treadle having clamped thereona collar I13 which normally engages the underside of the treadle. The upper end or the rod is located between a pair of spaced arms I18 that extend rearwardly from a sleeve I19 (Figs. and 6) which is rotatably mounted on the stem I80 of the rotary plug in the valve I16, while the pawl I14 is located between the valve casing and the adjacent arm I18. The pawl I14 and the position shown in Fig. 6 by a sprin I82 which urges an oppositely located forwardly extending arm I18 on the sleeve I19 downwardly against an adjustable stop screw-I98 threaded into a flange I99 that projects inwardly from the wall I2.

The tooth I88 of the pawl I14 is normally seated in the uppermost of four equally spaced notches I8I in the periphery of a-collar I82 which is keyed to the valve stem I80, the tooth being urged into the notch by a spring I94 which is connected at one end to, the toothed portion of the pawl and at its other end to a pin I96 on the sleeve I19. The pawl tooth I88 has parallel front and rear surfaces which engage against the opposite side of the notches in which it is seated and forms a positive two-way connection with the collar which enables the operator partly to open and to close the valve to adjust the sole locating mechanism while he is positioning a shoe on the pad.

When the treadle I10 is fully depressed the pawl I14 'is rotated in a counterclockwise direction as viewed in Fig. 6 and moves the valve plug with it to its fully open position. Near the end of the downward movement of the treadle a tail I84 of the-pawl strikes a pawl lifting stud I86, and as the treadle continues downwardly to the limit of its movement, the stud I86 causes the pawl tooth I 88 to lift out of the notch in which it is seated until a beveled surface on the. pawl tooth lies above the surface of the collar I82, at which time a spring-pressed plunger I90 located beneath the collar enters one of the notches I80 which moves opposite to it at this time and yieldingly resists further movement of the collar. When the treadle is released, a spring I92 connected to the arm I18 rotates the sleeve I19 in a clockwise direction, as viewed in Fig. 6, thereby causing the beveled surface on the pawl tooth I88 to ride up on the side of the notch until the pawl tooth'rests on the periphery of the collar I82 and then to move with the collar until the tooth drops into the next notch; the pawl tooth being held against the periphery of the collar during its movement between notches by the spring I94.

The upward limit of movement of the treadle I10 is determined by engagement of a boss 200 on the upper side of the treadle with the under side rod I12 are connected to the arms I18 by a pin of the base, while its lower limit of movementis determined by the engagement of a collar 202 on. the rod I12 with a plate 204 seated on the upper end of the pipe I16, the treadle normally being held in its upper position by a spring 206.

When the valve I16 is moved to its inlet position by the treadle, it admits pressure fluid to a chamber 208 in a cylinder 209 (Figs. 3 and 10), where the fluid acts against the under side of a plunger 2I0, and raises the plunger against the resistance of aspring 2I2 until a sleeve 2 connected to the lower end of the plunger strikes against the lower end of the cylinder 209. The pressure fluid is supplied by the pump I and passes through the pipes I56 and 2I6 (Figs. 5 and 10) to'a pressure control valve 2I8 whence it flows through a pipe 220 to a second pressure control valve 222 and then through pipes 224, 228, and 228 to the valve I16 and from there through a pipe 230 to the chamber 288. If des red, the pressure control valves 2" and 222 and also 444, which will be hereinafter referred to, maybe similar to the pressure control valve I010 described inthe United States Letters Patent No. 2,047,185, issued July 14, 1936, on an application flied by Ballard et al.

When the plunger 2I8 is raised by the action of the pressure fluid, it on cm 232 mg. s)

which forms partof the operating linkage of the gagingmechanism associated with the pad box at the loading statlonfand which overlies the plunger while the pa'd'box'isat that station. The upper end of the rod 232 is connectedto abell-crank lever 234 which is in turnconnected to a bar 233 that corresponds to the bar I66 in the disclosure of the beforementioned Finn Patent No. 2,262,759. Upward movement of the-rod 232 rotates the lever 234 in a clockwise direction and moves the bar 236' to the right, as viewed-in Fig.

lever and passes through an opening. in a plate- 242 which is in turn connected with the arm 12 of the .left bail by members 244, 246. The force exerted by the compressed spring 238 on the plate 242 is nearly strong enoughto cause the bails to move toward each other so that the operator is materially assisted in moving them to aposition above a shoe on the pad.

The locating mechanism is automatically released from the sole and the shoe after they have been pressed firmly into the pad. The release of .the locating mechanism is effected by the depression of a plunger 256 in a chamber 249 which is connected to the chamber I68 by a passage 248, the plunger being forced downwardly when the pressure of the fluid in these chambers buildsup .sufliciently to overcome a backing spring 252 This,-of course,

which-surrounds the plunger. takes place after the piston 82 has been forced down far enough to uncover the passageway I26 and the pressure has built up in the. chamber M8.

The downwardly moving plunger strikes'the head 254 (Figs. 3 and 6) of the treadle rod I12 and moves'the latter downwardly, causing the valve I16 to rotate to its next position, where the chamber 268 and the pipe 236 are connected to an ex-. haust pipe 23I which discharges into the reservoir (Figs. 6 and 16). The spring 2 I 2 which surrounds the plunger 2I6 will then move that member downwardly, allowing a spring 256 (Fig. 3) to rotate the lever 234 in a counterclockwise direction and move the locating mechanism to its inoperative position. As the lower end of the rod I12 is slidable in an opening in the treadle I16, downward movement of the rod caused by the action of the plunger 256 will not disturb the treadle.

There is a possibility that the lower ends of the plunger 256 and the rod 232 will be bent or broken when the turret is rotated to move a pad away from and back to the loading station due to the fact that the lower end of the plunger is pressed against the head 2540f the rod I12 when the pad moves away from the loading station, and when it moves back to the loading station the lower end of the rod 232 will strike against the head of the plunger 2I6 if the plunger has not fully returned to its down position. Accordingly, both the plunger 256 and the rod 232 have been made in two parts which are connected by a spring-closed hinged joint 258 which permits them to break when their lateral movement is resisted.

The rotary valve I58 which controls the flow of pressure fluid to the cylinder 84 is constructed to operate both as an inlet or supply valve and as an outlet or exhaust-valve and is'operated by two independent control systems. The first of these control systems, considered in the sequence of properly located on the pad and moves the valve I58 to its inlet position where it admfis pressure their operation, is operated by the treadle 266 which is depressed when a sole and a shoe are fluid to the cylinder 84 which causes the shoe to be pressed into the pad. Jhe second control system moves the valve I58 to its exhaust position and is sequentially operated by each of four cams 264 (Fi 5) which are mounted on the manifold 10' The operation of the second system takes place as 28 in predetermined relation to the fourpads.

the diflerent pads return to the loading station after having moved around the turret and eifects the release of the pressure fluid from the cylinder associated with the returning pad so that the attached. shoe and sole can readily be removed from the pad.

The first control system for operating the valve 3 I58 consists of a pawl 266 (Figs; 5 and 8) having a tooth 268 which is successively seated in six equally spaced square notches 216 formed in a collar 212 which is keyed to thestem 214 of the plug in the valve I58. Rotatably'mounted on the stem 214 (Fig. 8) is a sleeve 216 having two ,spaced rearwardly extending-arms 218 which receive between them a treadle rod 286. The pawl 266 is located between the valve I58 and the adjacent arm 218, and both the treadle rod and the pawl are, connectedto the arms 218 by a transversely extending pin 282. The arms 218 are held in their up position shown in Fig. 8 by a spring 364 which is connected to a forwardly extending arm 284 on the sleeve 216 and holds that arm against an adjustable stop screw 286 mounted on the flange I99. The treadleprod 286 extends through an open ended pipe 296 '(Fig. 8) to a point below the bottom of the reservoir (Fig. 2) where itis connected to the treadle 266 by a coupling similar to that disclosed in Fig. 7. The treadle is normally held against the under side of the reservoir by a spring 292, and its lower limit of movement is determined by the engagement between a collar 284 on the rod 286 and a plate 296 a mounted on the top of the pipe 296.,

Whenthe treadle 266 is depressed the plug in the valve I58 is rotated by the. pawl 266 and as the treadle nears its lower limit of movement the pawl tooth 268 is lifted out of the notch 216, in

which it is seated by the engagement between vscrew 286.- As spring 366, which is connected to the pawl and to a pin, 368 on the sleeve 216, causes the pawl tooth 268 to ride over the surface of the collar 212, as it moves with the sleeve until'it drops into the next notch 216. It will be noted that the pawl tooth 268, like the pawl tooth I88. has paralled front and rear surfaces. These surfaces form a positive two-Way connection with the collar 212 until the pawl is lifted out of the notch in which it is seated by the stud 366, thus making-it possible for the operator to raise and lower the bails 16 as he adjusts a shoe on the pad.

When the loaded pad again approaches the loading station after having moved about the turret, the plug in the valve I 58 is rotated, by

' other arm ofthe bell-crank lever 3m is provided with a roller 3 (Fig. 5) which is located in the path of rotation of-the cams 264 when the valve operating pawl 266 is in its upper position, shown in Fig. 8, so that the cam 2'64 associated with the pad that is moving to the loading station will strike the roller 3 and cause the lever 3i6 to rotate in a clockwise direction, as viewed in Fig. 5, and move the plug in the valve I58 to its exhaust position.

A safety mechanism is applied to the valve I56 which permits an inlet passage of the valve to be opened and closed thereby to move the bails 16 up and down as the operator adjusts the shoe on the pad but which, once pressure has been fully applied to the pad, requires the operator fully to release the bails by moving the valve all the way to its exhaust position before pressure can again be applied to the shoe. This mechanism takes care of the situation which occasionally arises when an operator. after fully applying pressure to the shoe and taking his foot from the treadle 263, sees that the shoe is improperly adjusted and partly depresses the treadle a second time to raise the balls so that he can correct the adjustment of the shoe. It has been found that when the operator partly depresses the treadle Each of the valves I66 and "6 (Fig. 5) is provided with a cylindrical plug of the type illustrated in Figs. 4 and 10. This plug has three equally spaced slots 324 which are successively moved to inlet and exhaust positions. As one of these slots is always in register-with the pipe supplying pressure fluid, the registering slot will a be filled with the pressure fluid which forces the 324 will be counteracted by the reaction of the the second time to raise the bails so that he can adjust the shoe he has a tendency to forget that the pawl 266 is positively connected to the collar 212 at this time and that the bails will again move downwardly when he lets the treadle rise, and he sometimes removes his foot from the treadle, thereby endangering his hand which has taken hold of the shoe.

The safety mechanism consists of a collar 3" (Figs. 5 and 9) pinned to a valve plug spindle 3l3 which projects from the left side of the valve I63, and a pawl 326 which co-operates with ratchet teeth 322 formed in spaced sections of the periphery of the collar M6. The ratcheted sections 322 correspond to the location of the slots 324 (Figs. 4 and 10) in the valve plug when positioned to exhaust the pressure fluid from the cylinder 84 and the smooth surfaces 326 on the collar 3i6 which extend between the ratcheted portions correspond to the inlet positions of the slots 324 when they connect the cylinder 64 with the pump I66. Thus, when the treadle 266 is depressed to move one of the slots 324 in the plug of the valve I53 to an inlet position, the tooth of the pawl 326 will ride over one of the smooth surfaces 326 so that the operator can raise and lower the treadle to control the bails while he is adjusting the shoe. However, once the treadle has been fully depressed and the slot moved all the way into its inlet position, the pawl tooth will drop into the flrst notch of the ratchet 322 so that the valve plug must be moved to its full exhaust position before the pawl tooth meets the next smooth surface 326, which permits the operator to again move the valve to its inlet position. The tooth of the pawl 326 is held against the surface of the collar 3I6 at all times by a spring 323 which is fastened at one end to the pawl and at its other end to the valve casing.

pressure fluid in the pockets formed by the slots 332.

I The turret is rotated by a fluid motor which is operated by pressure fluid from the pump I66 (Fig. 10) which flows from the pressure control valve 222, through the pipes 224, 334 to a riser pipe 336 in the stationary post l6. thence out through a port 333 and arecess 346 in the post to manifold chambers 342 which are connected to pipes 344 that lead tothe cylinders of the fluid motor which are in propelling position. The chambers 342 in the manifold are separated by partitions 346 that slide over the surface of the post. Therecess 346 in the post is sufliciently long so that it extends beyond the sides of the partition 346 which lies opposite to the port 333 and opens into the chambers 342 on both sides of that partition. The two chambers 342, which are connected to the cylinders in exhaust position, are connected by a recess 346 in the post to a riser pipe 343, thence to a pipe 362 which opens into a chamber 354 in a valve casing 366. Also opening into the chamber 334 is a pipe 333 which is connected through the pipes 226, 224 to the pressure control valve 222.

Operation of the fluid motor is controlled by a slide valve 366 (Fla. 2) which regulates the escape of the pressure fluid from the cylinders in the exhaust position and also functions as an index pin.

The valve is mounted for reciprocation in the valve casing 366 from which it projects at both ends. The end 362 ofthe slide valve adjacent to the manifold 23 functions as the indexing pin and is provided with a roller 364 which is normally seated in one of four recesses 366 (Fig. 5) spaced degrees apart in a cam 366 which is fastened to a shoulder 363 on the lower portion of the manifold by bolts 3" (Fig.2). The bore in the valve casing 366 is of different diameters, the section adjacent to the manifold being of greater diameter than the section in the opposite end. The mid-portion of the bore contains two spaced circumferential grooves which open onto the pipes at: and m, and the bore between these grooves is of the same diameter as the larger section of the bore adjacent to the manifold. The slide valve m is constructed with a shoulder 312 of a diameter to make a sliding flt in the end of the valve casing adjacent to the manifold 23 and a smaller shoulder 314 of a diameter which is complemental to the smaller opening in the opposite end of the casing. As the shoulder 312 is larger incross section than the shoulder 316, the pressure fluid in the mid-portion of the cusing forces the slide valve to the right, as viewed in Figs. 2 and 10, and keeps the roller 364 in engagement with the cam 366 while the turret is rotating and seated in the bottom of one of the recesses 366 while the turret is at rest. The portion of the slide valve between the shoulders 312 and 314 which is located between the grooves in the valve casing when the roller 364 is seated in the recess 366 is of reduced diameter so that the passage or chamber 354 connects the pipes 352 and 356 at this time.

Rotation of the turret is initiated by a hand lever 356 (Figs. 2 and 7) which withdraws the slide valve 366 part way from the recess 366 in which it is seated to a position where the roller 364 lies opposite to an inclined surface 316 (Fig.

) on the indexing cam 368. When the slide valve reaches this position, the shoulder 312 will be displaced sufficiently to the left, as viewed in by the pistons in the driving position and tend to freeze the roller in the recess. a The hand lever .366 which operates the slid valve-366 is mounted in a socket 395 formed on a sleeve 396 (Figs. 2 and 7) which is pinned to one end of a shaft 391 mountedln a bearing 396 attached to a bracket 399 that is fastened to the top of a partition 466 which projects up from the base I6. Thepartition is located in the front portion of the base below the loading station, where it forms a support for the slide valve. and

elements of the slide valve operating mechanism.

Pinned to the opposite end of the shaft 391 adja cent to the'end of the bearing 396 opposite to 'the sleeve 396 is a crank arm 46!, and rotatable on that end of the shaft is a forked arm 462 Fig. 10, to close the central part of the chamber 354, thus shutting off the pressure fluid from the cylinders 36, 36 which are in the exhaust position when the cylinders are located as shown in Fig. 10, and at the same time the shoulder 312 will have slightly uncovered the port 313 leading to the pipe 352 which allows the pressure fluid in the cylinders'36, 38 to escape through the pipe 352, past a reduced portion 318 of the slide valve 366, and then through a discharge pipe 366 into'the reservoir. The escape of the pressure fluid from the cylinders 36, 36 permits'the cylinders 34,46

which are in the driving position to rotate the turret head and this rotation carries the inclined surface 316 of the cam 366 beneath the roller 364, forcing the slide valve 366 still further to the left, as viewed in Fig. 10, until the port 313 leading to the pipe 352 is fully uncovered. When the slide is in this position, the pressure fluid can escape most rapidly from the cylinders 36, 36 and the turret will rotate at its maximum speed.

As the pad to the left of the loading station approaches the loading station, an inwardly sloped surface 362 on the indexing cam 366 moves beneath the roller 364, and allows the slide 366 to move to the right, as viewed in Fig. 10,

untilthe roller 364 reaches a relatively flat surface 364 on the indexing cam, when the slide valve will have moved to the right to a position where an opening 366 in the shoulder 312 is located in the groove opening onto the pipe 352 which allows the pressure fluid to escape from the exhausting cylinders. nected through a small passageway 368 .in the slide valve to a second opening 396 which at this time will be in register with a port 39l leading to an orifice plate 392 which opens onto a pipe 394 that discharges back into the reservoir. The re stricted openings in the passageway 388 and the orifice plate 392 reduce the flow of fluid from the exhausting cylinders, thereby reducing the speed of rotation of the turret to a point where it is .barely moving. This movement is stopped alto gether when the roller 364 drops into the next recess 366 when the slide valve moves to the position shown in Fig. 10 where the shoulder 312 prevents further escape of fluid from the exhaust cylinders.

When the turret is'at rest the roller 364 is seated in one of the recesses 366 and the slide valve shoulder 312 is in the position shown in Fig. 10 where the pipe 358 is connected to the pipe 352 by the chamber 354 so that the pressure fluid can flow through the chamber 354 to the cylinders 36, 38 in exhaust position. Thus, equal pressure is applied to all the pistons in the fluid motor at this time, thereby eliminating the rotational force which would otherwise be exerted The opening 386 is conwhich is connected to the stem of the slide valve 366 by: a pin 463 that is seated in the fork in the arm 462. The crank arm 46l is connected to the forked arm 462 by a latch 464 which hooks over a pin 466 that extends laterally from the arm 462. When the hand lever 356 isoperated, the

latch 464 causes the arm 462 to move with the crank arm 46! and to withdraw the slide valve 366 a sufllcientdlstance from the cam 366 to re- -move it from the recess 366 and crack theport 313 (Fig. 10) leading to the exhaust cylinders, thereby initiating the rotating of the turret. As the turret rotates, the cam surface 316 moves the slide valve 366 further to the left, as viewed in Fig. 7, causing the forked arm 462 to move relatively to the crank arm 46! and the pin 466 to'ride beneath a shoulder 466 on the latch and lift the same. When the latch is lifted sufficiently for its hooked end to clear the pin 466, a pivoted stop 6 mounted on the crank arm 46! is moved beneath a shoulder 4 on the latch 464 by a spring 2 and holds the latch in its raised position. Thus, the slide valve is free to move inwardly in response to the unbalanced pressure upon it away from the arm I as the contour of the cam 368 changes and stop the turret-after a quarter of a revolution even if the hand lever 356 is held down by the operator. When the hand lever is allowed to return to its up position (Figs. 2 and '7), an abutment screw 6 strikes the lower end of the stop 6 and knocks it out from beneath'the shoulder 4, allowing the spring 2 to pull the latch 464 down into engagement with the pin 466. Downward movement of the hand lever 356 is limited by a stop screw 426 mounted on a' plate 422 which projects laterally from the sleeve 396 while return movement of the hand lever 356 (Fig. 7) is limited by a second abutment screw 6 which engages a shoulder M9 on the crank arm MI. The lever 356 is held in its up position by a spring 42l which is located between the base I6 and the plate 422 where it urges the sleeve 396 in a clockwise direction and holds the shoulder 419 against the screw 4 I 8.

Withdrawal of the slide valve 366 by the hand lever 356 is resisted by the 'force exerted by the pressure fluid on the slide valve shoulder 312 which tends to keep the end of the valve seated in one of the recesses 366. This resistance is largely overcome when the shoe ispresesd into the pad by the action of a piston 424 (Fig. 10)

which is mounted in a cylinder 426 (Fig. 7) that depress the hand lever 350. Pressure fluid is conducted to the cylinder 426 (Fig. 10) by a pipe .7, and move the slide valve away from the cam 368. The assistance rendered by the piston 424 is controlled by the adjustment of a backing spring 438 in the valve 434 which yields when the pressure builds up sufficiently to overcome the resistance-of the spring and allows a plug 445 in the valve to move to the left and to close the port leading to the pipe 436, thereby preventi g the passage of additional fluid through the valve. Movement of the valve 365 to the start n position can be made fully automatic by using a spring 438 of sufllcient strength to prevent the movement of the plug 455 under pressures great enough to move the piston 424 to the left and cause the withdrawal of the valve from the recess 366 in which it is seated.

If desired, starting of the illustrated machine can be made fully automatic and be caused to take place only when a predetermined pressure has been applied to a shoe. This can be accomplished by by-passing the valve 434 with a pipe 442 and connecting into that pipe a pressure control valve 444 which can be set to open and permit the passage of pressure fluid to the cylinder 426 only when the pressure has been built up to a predetermined point. 446 may be provided so that the indexing mechanism can selectively be operated either by the manual control or under the automatic control just described.

The hydraulic apparatus in the illustrated ma chine includes a high-pressure system and a lowpressure system, both of which are supplied with pressure fluid by the pump I58. The high-pressure system is utilized to apply pressure to the shoe and to assist in the operation of the indexing mechanism, while the low pressure system is used to operate the fluid motor and the sole locating mechanism. Pressure in the high-pressure system is usually between 150 pounds per square inch and 250 pounds per square inch, depending upon the work operated upon, and is regulated by the pressure control valve 2I8 (Fig. 10) which is adjusted by a manually operated control 2I6 (Figs. 1 and 5), the pressure being .indicated by a conveniently located gage 448.

Pressure fluid in the high-pressure system passes to the cylinder 84 of thepad at the loading station, through the pipe I56 (Fig. the valve I58, and the pipes I66 and I05; and to the cylinders of the three pads away from the load n station, through a pipe 450 which branches oil from the pipe I56 (Figs. 5 and 10), a check valve 452, and a riser pipe 454 located in the center of the stationary post I6, thence up to three passageways 456 which open on to chambers I66 in the manifold, whence the pressure fluid passes to the aforementioned cylinders.

The chambers I66 are separated by partitions 458a-which control the flow of the pressure fluid to the cylinders in the following manner: After pressure has been applied to a shoe at the loading station-by pressure fluid supplied through the riser pipe I62, the turret is rotated to move that shoe,away from the loading station. During the.

initial part of this rotation the partition 458 A two-way valve immediately to the left of the port I64, as viewed in Fig. 5, moves past that port shutting ofl the riser pipe I62 from the cylinder 84, which is moving away from the loading station. As the riser pipe I62 is shut oil, the partition 458 which forms the other end of the chamber I66 uncovers the adjacent passageway 456, which is connected to the riser pipe 454 that is also connected with the pump I56. The second and third passageways 456 are connected to the chamber I66 in a like manner during the two following indexing operations. Thus, the cylinder 84 is continuousl connected with the pressure fluid supply as it moves from the loading station about the machine and to the station immediately to the left of the loading station. The check valve 452 in the line 450 leading to the riser pipe 454 shuts ofi automatically when the pressure drops in the line I56 while the cylinder 84 at the loading station is being filled and in this manner prevents fluctuations in the pressure applied to the shoes that are not at the loading station.

When the machine is operated a'fourth time to move the shoe back to the loading station, the rear partition 458 moves past the left passageway 456 (Fig. 5) while the front partition uncovers the passageway I64. When the port I64 is closed by the front partition 458, the cam 264 strikes the lever 3III and moves the valve I58 to its exhaust position. This allows the pressure fluid in the cylinder 84 associated with the pad moving to-the loading station to escape when the front partition uncovers the port I64, and the springs I28 to move the balls away from the shoe on that pad so that the shoe can readiliy be removed when it reaches the loading sta- When the pressure exceeds the setting of the pressure control valve 2I8 (Fig. 10), that valve opens and the pressure fluid passes through the pipe 220 to the second pressure control valve 222 which controls the pressure in the low-pressure system. The valve 222 is set to release under pressures in the neighborhood of to pounds per square inch, and when the pressure for which it is set is exceeded, the valve opens,

allowing the pressure fluid to flow back to the reservoir. The valve 222 is controlled by a hand wheel 464 (Fig. 5) and the pressure in the lowpressure system is indicated on a gage 466. From the pipe 220 the pressure fluid flows through pipes 334 and 358 to the cylinders of the fluid motor and controls the turret in a manner which has already been described.

Mounted on the rear of the base I0 (Fig. 1) is an electric motor 468 which drives the pump I50 through a pulley 410 fastened to the motor shaft "I, a belt. 412, and a pulley 414 connected to the pump shaft 415. The motor is controlled by a push button switch 416 fastened to the machine frame adjacent to the loading station in a location convenient to the operator. The sides of the machine are closed by swinging plates 418 pivoted on vertical posts 480 which are mounted on lugs 482 that jut out from the base wall I2.

Having described the construction of the illustrated machine, its operation will now be explained with particular reference to Figs. 2, 3 and 10. The operator first places a sole on the pad I65 at the loading station and then depresses the treadle I10 which moves the valve I16 to its inlet position where it admits pressure fluid to the cylinder 266. This causes the plunger 2I8 to operate the sole locating mechanism and cause the latter correctly to position the sole on the pad.

He then places a shoe upon the sole and locates the same with respect to the sole with the aid of gages providedfor that purpose, after which he moves the bails Ill above the shoe. The treadle I" is then depressed to move the valve I58 to the inlet position where it admits pressure fluid to the-cylinder 84 underlying the pad at the loading station, which causes the bails Ill to press the shoe into the pad. When the pressure in the cylinder 84 has built up to a predetermined point, it .depresses the plunger 2" which strikes the valve I16 and moves it to its exhaust position, allowing the pressure fluid that had lifted the plunger 2"] to escape. This permits the spring 2|! to move the plunger Ill downwardly and the spring 256 to withdraw the locating mechanism {rpm the shoe and sole.

Having applied pressure to the shoe on the pad at the loading station, the operator depresses the hand lever 350, partly withdrawing the slide valve 34. from the notch"! in the indexing cam 368 and initiates rotation of the turret. As the turret rotates, the slide valveis first forced back by the cam. 368, increasing the speed of rotation of the 'turret, and is then allowed to move inwardly again as the notch 36S associated with the pad moving to the loading station approaches the indexing pin, thereby slowing down the movement of theturret until the indexing pin drops into the notch, when the movement is completely stopped. In the early part of the movement of the turret, the chamber I 66 associated with the cylinder 84 beneath the pad moving toward the loading station uncovers the port I64, at which time the cam 284' (Fig. 5) associated with that pad strikes the roller 3 on the bell-crank lever ill and moves the valve I" to its exhaust position. This allows the pressure fluid in the cylinder 84 to escape back to the reservoir and the heavy springs I2! to lift the bails from the shoe so that the operator can take the shoe from the pad without delay when it arrives at the loading station.

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

1. In a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, and a multicylinder fluid motor arranged to operate said conveyor and directly connected thereto.

2. In a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, and a multicylinder fluid motor movable with said conveyor and arranged to operate the conveyor step by step. v

3. In a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, aefixed abutment associated with the conveyor, and a fluid motor movable with the conveyor and so connected to the abutment that theconveyor is operated by the reaction of the fluid motor against the abutment. v

4. In a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, an abutment associated with the conveyor, a multicylinder fluid motor mounted on the conveyor and connected with the abutment, and means for rendering the cylinders sequentially effective to react against the abutment and thereby to operate the conveyor.

' stationary post having fluid'conducting passages,

a turret having a sleeve rotatable on the post, a portion of said sleeve comprising a manifold and having chambers opening onto the passages-in the post,-a fluid motor for rotating the turret. step by step, and means'for connecting the manifold to the fluid motor.

9. In a machine for operating upon shoes, a stationary post having fluid conducting passages, a turret including a sleeve rotatably mounted on v the post, a portion of said sleeve comprising a manifold having chambers opening onto the pas-q sages in the post, afluid' motor mounted on the turret and arranged to rotate the turret, and

means for connecting the manifold with the fluid motor. I

10. In a machine for operating on shoes, a turret mounted for rotation, a fluid motor for rotating the turret, said fluid motor being arranged for movement with the turret, means for con? trolling the fluid motor, :an indexingpln operatively associated with said means, and a cam connected with the/turret for movement therewith, said cam havingnotches for-the reception of -the indexing pin when the turret reaches a predetermined position.

11. In a'machine for operating upon shoes, a rotatable turret having a plurality of. work receiving units, a fluid motor for moving the turret step by step successively to bring the units to a loading station, a valve for controlling the fluid motor, an indexing pin operatively associated with the valve, and acam connected with the turret,- said cam having notches located in predetermined relation to said units an the reception of the indexing pin when the units reach the loading station.

- 12. In a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, a fluid motor for operating the conveyor, and means for regulating the exhaust of the pressure medium from the fluid motor to control its operation.

13. In a shoe machine, a, conveyor, a plurality of work receiving units on said conveyor, a multicylinder fluid motor for operating the conveyor,

and means for selectively regulating the exhaust or the pressure medium from the cylinders to control the operation of the motor.

14. In a shoe machine, a conveyor, a plurality of work receiving units on said'conveyor, a multicylinder fluidmotorfor moving said conveyor step by step successively to move the units to a loading station, a pressure line, a manifold arranged successively to connect the cylinders to the pressure line, an exhaust line connected with said manifold, the manifold beingarranged to connect the exhaust line to the cylinder oppo- 5. In a machine for'operating upon shoes, a

6. In a machine for operatingupon shoes, 8.

site to the one connected to the pressure line, and

a valve for controlling the exhaust of the pressure fluid from the cylinder connected to the exhaust line.

15. In a shoe machine, a conveyor, a plurality,

of WQl'k receiving units on said c0nvey0r,-a multicylinder fluid motor for operating said conveyor step by step successively to move the units to a loading station, and means for applying equal pressure to all of the cylinders when the conveyor is at rest.

6. In a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, a multicylinder fluid motor for moving said conveyor step by step successively to bring the units to a loading station, a manifold associated with the cylinders, a pressure line and an exhaust line connected with said manifold for selective connection with the cylinders of the motor, and a valve connected to the exhaust line and to the pressure line, said valve being arranged to control the speed of the motor by regulating the exhaust of the pressure fluid from the cylinder in exhaust position and when the machine is at rest to admit pressure fluid to the cylinder in exhaust position, thereby to equalize the pressure in all cylinders.

17. In a shoe machine, a conveyor, a plurality of work receiving units on the conveyor, fluid operated means for moving said conveyor step by step successively to bring the units to a loading station, a valve for controlling the operation.

of the fluid operated means, and a cam associated with said conveyor and arranged to regulate the position of the valve.

18. In a shoe machine, a conveyor, a plurality of work receiving units on the conveyor, a fluid motor for moving the conveyor step by step successively to bring the units to a loading station. a fluid system for supplying pressure fluid to the motor, a valve for controlling the flow of pressure fluid in said system, and a cam associated with the conveyor and arranged to regulate the position of the valve.

19. In a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, fluid operated means mounted on the conveyor and arranged to move the conveyor step by step successively to bring the units to a loading station, a valve for controlling the operation of the fluid operated means, and a cam movable with the conveyor and arranged to regulate the position of the valve during the operation of the conveyor.

20. In a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, fluid operated means for moving the conveyor step by step successively to bring the units to a loading station, a valve for regulating the fluid operated means during the operation of the conveyor, a cam operatively connected with the conveyor and arranged for sliding engagement with the valve, and means for holding the valve in engagement with the cam.

21. In a shoe machine, a conveyor, a plurality of work receiving units ,on said conveyor, fluid operated means for moving said conveyor step by step successively to bring the units to a. loading station, a cam movable with said conveyor and having notches arranged successively to reach a predetermined position when the units reach the loading station, a valve for controlling the fluid operated means, said valve being arranged to seat in the notch in the predetermined position when the conveyor is at rest and to function as an indexing pin.

22. In a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, a notched cam movable with the conveyor, fluid operated means for moving said conveyor step by step successively to bring the units to a loading station, a valve for controlling the fluid operated means, said valve being arranged to seat successively in the notches in the cam between the movements of the conveyor, and means for partly withdrawing the valve from the notch in which it is seated to initiate the operation of the conveyor, said cam having surfaces arranged to increase the opening of the valve after the movement of the conveyor has been initiated to increase the speed of the conveyor movement.

23. In a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, fluid operated means for moving the conveyor step by step successively to bring the units to a. loading station, a valve for controlling the fluid operated means, a cam having spaced notches in which the valve successively seats between the operations of the conveyor, said cam having surfaces arranged to regulate the position of the valve during'the operation of the conveyor and nearly to close the valve near the end of each operation, the valve being arranged at this time to restrict the flow of the pressure fluid from the fluid operated means and thereby to reduce the speed of the conveyor.

24. In a shoe machine, a conveyor, a plurality I of work receiving units on said conveyor, fluid operated means for moving the conveyor step by step successively to bring the units to a loading station, a valve for controlling the fluid operated means, a cam arranged for cooperative engagement with the valve, the cam having spaced notches arranged to receive a portion of th valve while the conveyor is at rest and surfaces arranged to regulate the operation of the valve during the movement of the conveyor,'said surfaces being arranged to fully open the valve during the early part of each operation of the conveyor thereby to move the conveyor at a maximum speed and then to allow the valve nearly to close as the next notch approaches thereby to slow down the speed of the conveyor.

25. In a shoe machine, a conveyor, a plurality of work receiving units on the conveyor, fluid operated means for moving the conveyor step by step successively to bring the units to a loading station, a fluid system for supplying pressure fluid to the fluid operated means, a valve for controlling the flow of pressure fluid in said system, said valve being adapted to register with a restricted oriflce when moved to a predetermined position and reduce the flow of the pressure fluid, and a cam associated with the conveyor and-arranged to control the valve during the movement of the conveyor and to locate the valve at the predetermined position near the end of the movement of the conveyor thereby to reduce the speed of the conveyor.

26. In a machine for operating on shoes, the combination of a rotatable turret, a fluid motor for operating said turret step by step, a valve for controlling the operation of the fluid motor, and a cam mounted on the turret in cooperative relation with the valve, the cam having a plurality of spaced notches for the reception of a portion of the valve when the turret is at rest and valve operating surfaces between the notches, each of the surfaces comprising an abruptly sloped portion on the advancing side of the notch arranged to open the valve wide at the beginning of the rotation of the turret to cause the turret to move at a maximum speed, a portion of uniform radius extending from the abruptly sloped portion to the vicinity of the next notch in the advancin direction of the cam. and a por- ,motor, a cam associated with the valve and havtion of diminishing radius adjacent to the next notch.

27. In ashoe machine, a conveyor, a plurality of work receiving units on the conveyor, a fluid motor for moving said conveyor step by step successively to bring the units to a loading station,

a valve arranged to control the exhaust of pressure fluidirom said motor, and a cam associated with said conveyor for regulating the position of the valve. 28. In a shoe machine, a conveyor, a plurality of work receiving units on the conveyor,'a multicylinder fluid motor movablewith the conveyor and arranged to move the conveyor step by step successively to bring the units to a loading station, a valve for regulating the exhaust or the pressure medium from the fluid motor to control its operation, and a cam movable with the conveyor and arranged to control the position 01' the valve during the operation or the conveyor.

29. In a machine for applying pressure to shoe bottoms, a rotatable turret, a plurality of pressure applying units on said turret, a fluid motor ing spaced notches arranged successively to refor rotating the turret to bring the units successively to a loading station, -a notched cam movable with the turret, a combined valve and indexing pin associated with said cam, said combined valve and indexing pin being. arranged to render the fluid motor inoperative when seated in a notched portion 01' the cam and to control. 7 the operation 01' the motor when in engfiflqment .with a surface of the cam between successive notches.

30. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units on said conveyor, means for operating the conveyor to bring the units successively to a loading station, a displaceable devicei'or controlling the operation of the conveyor operating means, a cam associated with the conveyor for controlling the position of the device during ,theoperation of the conveyor, said cam having notches arranged for the reception of a portion of the device when the conveyor is at rest, means for applying pressure to the unit at the load- .ing station, and means responsive to the pres- -sure in said unit arranged partly to withdraw the device from the notch .in which it is seated when the pressure in the unit at the loading station reaches a predetermined level, thereby to initiate movement of the. conveyor.

31. In a machine for applying pressure to shoe bottoms, a rotatable turret, a plurality of fluid operated pressure applying units on said turret,

a fluid motor for operating the conveyor to bring the units successively to a loading station, a valve for'controlling the operation of a fluid motor, a cam mounted on said turret and arranged to control the position of the valve during the movement of the turret, said cam having notches, located in a predetermined relation to the'units" and arranged for the reception of a portion or the valve when the turret is stationary, a piston connected with said valve, means for applying ,ceive the valve when the conveyor is at rest, the

valve being arranged to' stop the operation of .the fluidmotor when seated in the notches,

means for urging the valve toward the cam, and means for assisting the operator in moving the valve from the notch inlwhich it is seated to im- 10 thenext operation oi the fluid motor.

33. In -a shoe machine, a conveyor, a plurality of work receiving units on said conveyor, a fluid motor for moving the conveyor step by step .successivelyto bring the units to a loading statiofi, avalve i'or co'ntrolling'the operation of the fluid motor, an indexing pin connected with said valve. a cam associated with the conveyor and having notches arranged successively. to receive the indexing pin when the conveyoris at rest, said valve being constructed and arranged to stop the motor when the indexing pin is seated in Y the notches, and means associated with the work receiving unit 'at the loading station and. ar-

ranged automatically to withdraw the indexing pin from the notch in which it is seated when the work is flxed to the work receiving unit.

34. .In a machine for operating on shoes, a turret mounted for rotation, said turret having. a

plurality of work receiving units, a motor for rotating said turret, step by step successively to bring the unitsto a loading station, a shiftable member for controlling the operation of the motor, and means for urging the shiftable member toward a position where it initiates the operation of the motor, said means being associated with the instrumentalities of the work receiving unit at the loading station and eifective when a work piece is fixed to that unit.

35. In a machine for operating on shoes, a turret mounted for rotation, said turret having a plurality of work receiving units, a fluid motor for rotating the turret step by step successively to bring the units to a loading station, an indexing pin, a notchedmember mounted on the turret andarranged for engagement by the in- P dexing pin while the turret is at rest, means for urging the valve toward the notched member, and fluid operated means arranged to assist the operator to withdraw the indexing pin from a notch in said member to initiate the .operation of the turret, said fluid operated means comprising a cylinder connected to the pressure fluid source, a piston in the cylinder and connections between the piston and indexing pin.

36. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried by the conveyor, means for operating the conveyor step by step successively to bring each unit to a loading station, means .ior, applying pressure to the pressure applying unit at the loading station, and means operative when the pressure'on the pressure applying unit at the loading station reaches a predetermined level for initiating the operation of theconveyorv operating means.

37. In a machine for applying pressure to shoe bottoms, a conveyor, aplurality of pressure applying units carried by'the'conveyor, means for operating the conveyor step by step successively to bring each unit to a loading station, and fluid means responsive to the pressure in the pressure applying unit at the loading station for initiating the operation of the conveyor operating means when the pressure in the unit at the loading station reaches a predeterminedlevel.

38. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of fluid operated pressure applying units carried by the conveyor, means [or operating the conveyor step by step successively to bring each unit to a loading station, fluid operated means for applying pressure to the pressure applying unit at the loading station, and means operative when the pressure on the fluid operated pressure applying unit at the loading station reaches a predetermined level for initiating the operation of the conveyor operating means.

39. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried by the conveyor, fluid operated means for moving the conveyor step by step successively to bring each unit to a loading station, means for applying pressure to the pressure applying unit at the loading station, and means operative when the pressure in the pressure ap plying unit at the loading station reaches a predetermined level for initiating the operation of the fluid operated means.

40. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of fluid operated pressure applying units carried by the con-.

veyor, fluid operated means for moving the conveyor step by step successively to bring each unit to a loading station, fluid pressure means for applying pressure to thepressure applying unit at the loading station, and means controlled by the fluid pressure in the pressure applying unit at the loading station for initiating the operation of the fluid operated conveyor moving means when the pressure in the unit at the loading station reaches a predetermined level.

41. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried by the conveyor, a motor for moving the conveyor step by step successively to bring each unit to a loading station, means for initiating the operation of the motor, means for applying pressure to the pressure applying unit at the loading station, and means responsive to the pressure in the pressure applying unit at the loading station for actuating the motor initiating means.

42. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried by the conveyor, a motor for moving the conveyor step by step successively to bring each unit to a loading station, means for applying pressure to the pressure applying unit at the loading station, a displaceable member for initiating the operation of the motor, and means controlled by the pressure in the unit at the loading station for displacing said member.

43. In a machine for apply ng pressure to shoe bottoms, a conveyor, a plurality of pressure applyin units carried by the conveyor, a motor for moving the conveyor step by step successively to bring each unit to a loading station, fluid means for applying pressure to the pressure applying unit at the loading station, a dlsplaceable member for initiating the operation of the motor, a cylinder having a piston operatively connected with the displaceable member, and means for connecting the cylinder with said fluid means so that the pressure fluid acting on the piston urgesthe displaceable member toward its motor operating position.

44. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality oi. pressure applying units carried by the conveyor, a fluid motor for operating the conveyor step by step successively to bring each unit to a loading sta tion, means for applying pressure to the pressure applying-unit at the loading station, a valve for initiating the operation of the fluid motor, and means responsive to the pressure in the unit at the loading station for moving the valve to its motor operating position. 1

45. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried by the conveyor, a fluid motor for operating the conveyor step by step successively to bring each unit to a loading station, fluid means for applying pressure to the pressure applying unit at the loading station, a valve for initiating the operation of the fluid motor, and a piston controlled by the fluid means acting on the unit at the loading station for moving said valve to its motor operating position when the pressure in the unit reaches a predetermined level.

46. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of fluid operated pressure applying units carried by the conveyor, means for operating the conveyor step by step successively to bring each of the units to a loading station, a control for said conveyor operating means, a displaceable member for operating the control, means for conducting pressure fluid to the unit at the loading station, and means connected with -the pressure fluid conducting means for subjecting the displaceable member to the action of the pressure fluid, said last named means including a valve arranged to allow the passage of pressure fluid to the displaceable member only when the pressure in the unit at the loading station reaches a predetermined level.

4'7. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of fluid operated pressure applying units carried by the conveyor, means for operating the conveyor step by step successively to bring each unit to a loading station, a control for said-conveyor operating means, a cylinder having a piston connected with said control, means for conducting pressure fluid P to the unit at the loading station, a conduit for connecting the pressure fluid conducting means with the cylinder, and a pressure control valve in said conduit arranged to preventthe flow of pressure fluid to the cylinder until the pressure in the unit at the loading station reaches a predetermined level.

48. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of fluid operated pressure applying units carried by the conveyor, a fluid motor for operating the conveyor step by step successively to bring each unit to aloading station, a valve for controlling the operation of the fluid motor, a conduit for conducting pressure fluid to the unit at the loading station, a piston for operating the motor controlling valve, said piston being arranged for operation by the pressure fluid acting on the unit at the loading station, and a pressure con trol valve for controlling the application of pressure to said piston.

49. In a machine for applying pressure to shoe bottoms, a rotatable turret, a plurality of fluid operated pressure applying units carried by said turret, a multicylinder fluid motor arranged to rotate said turret, a valve for controlling the operation of the fluid motor by controlling the exhaust from selected cylinders, a piston operatively connected with said valve, a conduit connecting the unit at the loading station with a fluid-pressure source, and means for subjecting the piston to .the action of the pressure fluid 'in the conduit, said means including a pressure control valve arranged to open and permit the passage of pressure fluid to the piston only after pressure in the unit at the loading station means. a displaceable member for operating the controL means for conducting pressure fluid to the unit at the loading station, and means connected with the pressure fluid conducting means for subjecting the displaceable member to the action or the pressure fluid, said last-named means including a valve having a spring biased member arranged toshut oil the flow of pressure fluid toward the displaceable member when the pressure in the unit at the loading station reaches a predetermined level.

51. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of fluid operated pressure applying units carried by the conveyor, .neans for operating the conveyor step by step successively to bring each unit to a loading station, a control for said conveyor operating means,

a cylinder having a piston .connected with said control, means for conducting pressure fluid to the unit at the loading station, a conduit for connecting the pressure fluid conducting means with the cylinder, and a valve in said conduit having a spring biased member arranged to close the valve when the pressure in the unit at the loading station reaches a predetermined level.

52. In a machine'forapplying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried by'said conveyor, means for moving the conveyor to bring the units successively to a loading station, a hydraulic system for ap; lying pressure Ito the unit at the loading station, and a second hydraulic system for operating the conveyor moving means, the second hydraulic system being arranged to operate at a difierent' pressure level than the first-mentioned hydraulic system.

53. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried :by said conveyor, means for moving the conveyor to bring the units successively to a loading station, a high pressure hydraulic system for applying pressure to the unit at the loading station, and a relatively low pressure hydraulic system for operating the conveyor moving means.

54. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried by said conveyor, means for moving the conveyor to bring the units successively to a loading station, a hydraulic system for applying pressure to the unit at the loadin station, a second hydraulic system ior operating the conveyor moving means, said second hydraulic system being arranged to operate at a different pressure level than the first-mentioned hydraulic system, and a valve arranged to admit pressure fluid to the lower pressure hydraulic sys tem only when the pressure in the higher pressure hydraulic system reaches ,a predetermined level.

.55. ,In a machine for applying pressure to shoe draulic system only when the pressure in the high pressure system exceeds a predetermined level.

56. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried by said conveyor, means for moving the conveyor to bring the units successively to a loading station, a high pressure hydraulic system for applying pressure to the unit at the loading station, a relatively low pressure hydraulic system for operating the conveyor movingmeans, a pressure control valve for admitting pressure fluid to the low pressure hydraulic system from the high pressure system only when the pressure in the high pressure system reaches a predetermined level, and a valve connected into the low pressure hydraulic system and arranged to permit the escape oi pressure fluid from the 'low pressure hydraulic system when the pressure exceeds a predetermined level in. that system.

57. Ina machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried by said conveyor, means for moving the conveyor to bring th units successively to a loading station, a hydraulic system for applying pressure to the unit at the loading station, a second hydraulic system for operating the conveyor moving means, the second hydraulic system being arranged to operate at a diirerent pressure level than the first-mentioned hydraulic system, a valve inthe second hydraulic system for controlling the operation of'ithe comteyor moving means, and means responsive to the pressure in the first hydraulic system for urging said valve toward a position where it initiates the movement of the conveyor.

58. In a machine for applying pressure to shoe bottoms, a conveyor, a plurality of pressure applying units carried by said conveyor, means for moving the. conveyor'to bring the units successively to a loading station, a hydraulic system for applying pressure to the unit at the loading station, a second hydraulic system for operating the conveyor moving means, the second hydraulic system being arranged to operate at a lower pressure level than the first-mentioned hydraulic sively to a loading station. a high, pressure b a I draulic system for applying pressur to th unit Y at the loading station, a relatively: low pressure hydraulic system for operating the conveyormoving means, a valve in the low-pressure system for controlling the movement or the conveyor, a cylinder havingn piston operatively connected with said valve, said cylinder being connected with the hish pressure system so that the pressure in the "high pressure system urges the piston in a direction to move the valve to a posi- I

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