US1733692A

US1733692A - Pneumatic pressing machine

Info

Publication number: US1733692A
Application number: US281467A
Authority: US
Inventors: Joseph E Perrault; Louis J Schroeder
Original assignee: Hood Rubber Co
Current assignee: Hood Rubber Co
Priority date: 1928-05-29
Filing date: 1928-05-29
Publication date: 1929-10-29
Anticipated expiration: 1946-10-29

Description

Oct- 29, 1929 J. E. PERRAULT 5:1' AL 1,733,692

PNEUMATIC PRESSING MACHINE Filed May 29, 192e 8 sneets-sneet 1 ct. 29, i929,

J. E. PERRAULT ET AL PNEUMATIG PRES S ING MACHINE Filed May 29, 1928 8 Sheets-Sheet l Mse/0 Lou/9' 5 J Solv/zweden Oct. 29, 1929. J. E. PERRAULT ET'AL PNEUMATICI PRESSING MACHINE Filed May 29. 1928 8 Sheetsheet @Ch 29, w29: J. E. PERRAULT ET AL 2733592 PNEUMTIC PRSSING MACHINE Filed May 29, 1928 8 Shee'tS-Sheec 5 Oct. 29, 1929. J. E. PERRAULT n AL 1,733,692 y PNEUMATIC PRESSING MACHINE 8 Sheets-Sheet 6 Filed May 29, 1928 (III/l Oct; 2.95 1929.

J. E. PERRAULT ET AL PNEUMATI C PRESS ING MACHINE Filed May 29, 1928 8 Sheets-Sheet 8 Z771/ @row/".5 0050/9/ Li', Perra/Mi'. Loa/6. u.' .5G77 Woede?? Patented ct.. 29, 1929 JOSEPH E. .'PJEJBURAULT AND LUS SCHREDER, OF WATEBTWN, MASSACHUSETTS,

ASSIGNORS T HOOD RUBBER COMPANY EMTEON @F MASSACHUSETTS PNEEUEEATIC .PBESSXNG MCHINE Application :filed May 29,

rllhis invention relates to a machine for pressing shoes, particularly those constructed of rubber compound, or rubber' compound and fabric.

ln constructing shoes such, for example, as rubbers, overshoes, gaiters and the like it has been customary in assembling the various parts of which the shoe is built for the operator to roll each part individually With a hand tool as the parts are attached to each other in order that all of the various layers of material entering into the construction of the shoe Will adhere firmly together. As there are quite a number of parts employed in constructing shoes of this character, considerable time'is consumed in rolling the parts together,- and as considerable pressure is required, the work is very arduous especially When it is performed by Women operatives.

An improved method of construction noW contemplates assembling all of the various parts of the shoe with no more pressure than is required to hold each part in place temporarily and then pressing all of the parts together simultaneously by means of a mechanically operated pressing machine.

rl`he object of this invention is to provide a machine in which the pressing operation hereinbefore mentioned may be performed in a rapid and etticient manner, the pressing in strumentalities being so constructed that shoes of different sizes and styles may be operated upon Without it being necessary to make adjustments of any kind or change the form of the pressing members.

Another object of the invention is to provide a pressing machine which is operated and controlled entirely by a pressure fluid, preferably compressed air, the machine being started automatically when the last holder is moved to position the shoe Within the lower pressing unit and When the latter is located in an open position, and finally being stopped automatically after the pressing operation when the lower pressing unitis again returned to its normal, or open position, at which time it is necessary to raise the last holder manually before the pressed shoe is removed and another shoe inserted.

The invention consists in a machine for 1928. Serial No. 281,467.

pressing shoes or other articles of a similar character which are constructed of layers of sheet material which adhere together; as set forth in the following specification and particularly as pointed out in the claims thereof.

Referring to the drawings:

Figure l is a sectional side elevation of a shoe pressing machine embodying our invention, the machine being located in its normal or open position and portions thereof being broken away to save space in the drawings.

Fig. 2 is a View similar to Fig. l but illustrating the machine in its closed position.

F ig. 3 is a front elevation of the machine.

Fig. el is an enlarged plan view of the lower pressing unit together with a last holder and shoetthe latter being positioned ready for pressing.

Fig. 5 is a transverse section through the upper and lower pressing units, both of which are located in their closed positions with a shoe therebetween, the section being taken on the line 5-5 of Fig. ll.

Fig. 6 is an enlarged side elevation of a portion of the mechanism which is located upon the leftl hand side of the machine, said mechanism being viewed from the left hand side of Fig. 3.

Fig. 7 is a central vertical section taken on the line 7 7 of Fig. 6 looking in the direction of the arrows on said line.

Fig. 8 is a detail sectional elevation taken on the line 8 8 of Fig. 6 looking in the direction of the arrows on said line.

Fig. 9 is an enlarged horizontal section taken on the line 9 9 of Fig. 6.

Fig. 10 is an enlarged horizontal section taken on the line lO-l() of Fig. 6.

Fig. 1l is an enlarged sectional elevation taken on the line 11-11 of Fig. 4, the last holder being illustrated in its normal position ready to receive a last and shoe.

Fig. 12 is a detail section taken approximately on the line 12-12 of Fig. 11.

Fig. 13 is a detail section 'taken approi'ilmately on the line 13-13 of Fig. 11.

Fig. 14 is an enlarged central vertical section taken on the line ll-H'of Fig. 3.

Fig. l5 is an enlarged end elevation of the control valves viewing the same from the .Y right hand side orp Fig. 2.

Fig. 16 is a detail sectional elevation taken on the line 16-16 of Fig. l15.

Fig. 17 is a detail sectional elevation taken on the line 17-17 of Fig. 15.

Fig. 18 is an enlarged detail section taken on the line 18-18 ot Fig. 2.

Fig. 19 is a diagrammatic View illustrating theppipe connections to the various valves and iluid operated mechanisms.

Like numerals referto like parts throughout the several views of the drawings.

ln the drawings, 20 represents a main stationary :trame embodying therein a base 21, side portions 22 and a top portion 23, all of which areconstructed of structural iron and are bolted or otherwise secured firmly together in any suitable manner.

A rocker 'frame 24 is pivotally attached at 25 to a bracket 26 which, in turn, is mounted upon' the base portion 21 of the `frame 20. rlhe rockerirame 24 embodies therein a pair of rocker members 27, in each of which is mounted a pair ont cylindrical bars 28. Bearing members 29 are rigidly fastened to the bars 23, all of said bars extending through each bearing member and being rigidly secured thereto.

Rigidly secured to the under side of the top portion 23 or the main stationary frame 20 is an upper pressing unit 30, and slidably mounted upon the rocker frame 24 in a position to co-operate with the upper pressing unit 30 to i1orm. a .pressure chamber is a lower pressing unit 31. 'lhe upper pressing unit 30 embodies therein a casing section 32 having an open under side around the edge oit which extends a flange 33. A flexible pressing member 34 of expandible material extends loosely across the open side of the casing section 32 and is secured to the under surface of the iian'ge 33 by a clamping member 35. lThe pressing member 34 entirely closes the under side of the casing section 32 and co-operates therewith to form a fluid compartment 36 within the casing section.

The lower pressing unit 31 embodies therein a casing section 37 having an open upper side around the edge of which extends a flange 38. A tlexible pressing member 39 of expandible material extends loosely across the open side of the casing section 37 and is secured to the upper surface of the Hange 38 by a clamping member 40. The pressing member'39 entirely closes the upper side of the casing section 37 and co-operates therewith to form a luid compartment 41within the casing section. y

' rThe casing section 37 is mounted upon a support 42 in which a Vpair of cylindrical guide members 43 are rigidly secured and said guide members project downwardly through.

both of. the bearing members 29 and are slidably mounted therein. Tie members 44 are meegaan rigidly secured to both of the guide members 43 and act to hold the intermediate and lower portions of said guide members properly spaced. 'lhe actual weight of the lower pressing unit 31 is carried by

toggle links

45 and 46, the adjacent ends of which are pivotally connected together at 47. The upper end of the link 45 is pivotally attached at 48 to the support 42 and the lower end of the link 45 is pivotally attached to the pivot member 25 of the rocker frame 24.

The lower pressing unit 31 is moved from its normal or open position illustrated in Fig. 1 to its closed position illustrated in Fig. 2 by fluid pressure means operating through a piston rod 49 and piston 50, the latter being located within a pressure cylinder 51. rlhe piston rod 49 is attached to the pivot 47 for the

toggle members

45 and 46. The cylinder 51 is pivoted at 52 between a pair of brackets 53 which are mounted upon the side members 22 of the main stationary :trame 20. When the piston is actuated within the cylinder 51 in a manner hereinafter to be more fully explained, the lower pressing unit 31 will be rocked from the position illustrated in Fig. 1 to the vertical position illust-rated in Fig. 2 and during this rocking movement, the

toggle members

45 and 46 will be prevented `from functioning to lift said pressing unit on account oic the weight or" the latter and by means ot a pair of guide plates 54 which are fastened to the inner sides ot the side members 22 ot the 'stationary frame 20, the upper edge of guide portions 55 of the support 42 engaging the under edges of the guide.

plates 54 and thereby preventing the toggle links from moving into alignment with each other. When, however, the guide portions 55 of the support 42 are moved into alignment with guideways 56 provided upon the guide' plates 54, the toggle links 45 and 46 are permitted to function and thelower pressingv unit 31 will then be lifted into engagement with the upper pressing unit 30 and will assume the position illustrated in Fig. 2. llVhen the

casing sections

32 and 37 are closed, a pressure chamber is formed upon their interior.

Ashoe S formed of a plurality of sections of fabric and rubber compound adhering loosely together is located upon a last 57, in turn mounted upon a last holder 58, see Figs. 4, 5 and 11. The last holder 58 is rigidly secured to a shaft 59 mounted to rock in a bracket 60 fastened to the front of the lower casing section 37. rlhe last holder is held in its vnormal or open position by means of a coil spring 61, one end of which engages the bracket 60 and the other end of which engages a sleeve 62 fastened to the shaft 59 in a man- .ner to rock said shaft into a position where maaeea 3 icient pressure provided by the spring 61 to hold the last holder With the last and shoe thereon in their open positions, there is not, however, sutlicient strength to said spring to cause the last holder to be moved automatially from its closed position to its open position when the lower pressing unit is moved to its open position, and it is necessary for the operator of `the machine to manually raise the last holder from its closed to its open position. rlhe tension of the spring 61, hovvever, nearly counterbalances' the combined Weights of the last holder, last and shoe and practically no exertion is required to move said parts to their open position.

Vent passages l are provided in the last holder 58, thereby enabling air Which may be trapped between the upper and lower press- Cil ing members 34e and 39 to escape when pressure is applied to the opposite sides ot the pressing members during the pressing` operation.

The pressure tluid7 preferably compressed air, 'which is utilized to operate the various valves and mechanisms otl this machine, is delivered thereto through a main supply pipe which is connected with a pressure reducing valve 66, see Figs. 3 and 19. rl'he pressure Within the main supply pipe may be any amount above pounds and the pressure reducing valve 66 is provided tor the purpose of supplying the pressure tluid to certain of the mechanisms at approximately T5 pounds and is7 therefore, set at this amount.

From the pipe 65 a branch pipe 67 leads to another pressure reducing valve 68 which is set at approximately l5 pounds pressure. A condensation receptacle 69 having a drainage valve i0 is provided tor the main pressure supply pipe 65. rll`he pressure reducing valve (Sli is connected by means of a flexible tube 'il with a valve mechanism A Which is operated in a manner hereinafter to be described, by the rotation of the shaft 59, see Figs. 11, 12 and 153. A manually operated valve 72 controls the passage ot pressure iuid through the tube 7l. pipe 73 leads 'from the reducing valve 68 to a valve mechanism l which is operated in a manner hereinafter to be described by the rotation of a shaft 171, see Fig. 1G.

'the valve mechanisms A and B together with 'other valve mechanisms C and D which are operated in unison by the rotation of a shaft T5, see Fig. 9, are all constructed in a similar manner and a description of the valve d will apply equally well to all of the others, the same reference characters being used in connection with corresponding parts of each of said valve mechanisms. Each valve mech anism embodies'therein a ball check valve a. see Fig. 12 and a ball check valve l), see Fig. 13. The check valves a and o are controlled by means of cams c and (Z respectively Which are rigidly fastened to the control shaft tor said valve which, in the instance of the valve mechanism A, is the shaft 59. rlhe cams c and d each operate a bell crank lever e by engaging a cam roll f which is rotatably mounted thereon and rocking said bell crank lever upon a pivot g. The bell crank lever c controls the movement of a pin h, either holding said pin against the ball and holding it closed, or releasing said ball and allowing the latter to open from the pressure therebeneath. A spring z' engages the bell crank lever e in a manner to normally hold-the check valves a and closed as illustrated in Fig. 13, whereas when the cams c and d engage the rolls f the valves a and b will be open as illustrated in Fig. 12. Exhaust ports j are provided for each of the valve mechanisms A, l5, C and l) and communicate in each ot' said valves `with the check valve l5 thereof.

A pipe 76 leads from the valve A Where it communicates with the check valve a to a locking mechanism L hereinafter to be described, and a branch pipe 7? leads from the pipe 76 and communicates with the check valve b ot' the valve A. i portion of the pipe 76 is flexible to permit it to swing as the lovver pressing unit 31 opens and closes. Another pipe 78 leads :trom the locking mechanism L to a control valve mechanism hereinaiter to be described, a portion of said pipe being constructed of flexible tubing. .llt branch pipe 'i9 leads from the pipe 76 to the valve C where it communicates with the checlr valve a. Another pipe 8() leads from the valve C Where it communicates with the check valve a 'to the front end of the pressure cylinder 51 with vvliich it communicates through a needle valve 81. A portion of the pipe 80 is preferably eon structed ot flexible tubing. A branch pipe 82 connects the pipe 8O with the valve C Where it communicates with the check valve A branch pipe 83 leads from the pipe *I8 to the valve D where it communicates with the check valve a. Another pipe 8d leads from the valve D Where it communicates with the checlr valve a to the rear end of the pressure cylinder 51. with which it communicates through a needle valve '85. A branch pipe 86 leads from the pipe 8d to the valve ll) Where it communicates vvith the checlr valve b.

pipe 87 leads from the valve li where it communicates with the valve a to a T 88 from which a branch connection 89 preferably constructed of flexible tubing' leads to the fluid compartment l1 of the lower pressing unit 31. Another branch pipe 90 leads from the l 88 to the fluid compartment 36 of the upper pressing unit 80 A pressure gauge 91. com niunicates with the pipe 90 and is provided tor the purpose ot registering the pressure within the fluid compartments 36 and lll.. A branch pipe 92 leads from the pipe 8? to the valve l where it communicates with the check valve I).

The control mechanism M., see Figs. 15, 16 and 17, is located within a casing 93 which is cam portions 95 and 96 are slotted at 97 and 98 respectively, the slots of each cam portion being located opposite each other and the slots of the cam portion 95 being located 90 around the periphery thereof from the slots of the cam portion 96. A spring 99 surrounds the rod 94, one end of said spring engaging the back edge 100 of the cam portion 96 and the other end of said spring engaging an inner surface of the casing 93, and said spring normally acts to force the rod 94 toward the left in Figs. 16 and 17, and hold an edge 101 of the cam 95 against the interior of the casing 93 at such times as the rod 94 is not engaged by the extremity oi the piston 50. Splines 102 are providedior the rod 94 to prevent the same from rotating within the casing 93.

Mounted `Within the casing 93 and posi-- the levers 107 a roller 109 is rotatably mounted in a position to be engaged by both of the cams 95 and 96. 'llhe outer end of each of the levers 107 engages a pin 110 which in turn contacts with a spherical member of the check valve and holds the latter in its closed position. A spring 111 is provided for each of the levers 107 and acts to hold vthe roller 109 in engagement with the cams 95 and 96.

A pipe 112 leads from the casing 93 Where it communicates with the check valve 103 to a T 113 from which a branch pipe-114 leads to the lower end ot a timing valve cylinder T, see liig. 6. Another branch pipe 115 leads from the T 113 to the casing 93 where it communicates with the check valve 106. An exhaust port 116 leads from the check valve 103 to the atmosphere. A T 117 is provided for the pipe 78 and a branch pipe 118 leads from the T 117 to the casing 93 where it communicates with the check valve 105. Another pipe 119 leads from the casing 93 Where it communicates with the check valve 105 to a T 120 from which a pipe 121 leads to the upper end of the timing valve cylinder T, see Fig. 6. A branch pipe 122 leads from the, T 120 to the casing 93 where it communicates with the check valve 104. An exhaust port 123 leads from the check valve 104 to the atmosphere.

The timing mechanism T embodies therein a cylinder 124 in which a double action piston 125 is slidably mounted, see Fig. 7. The cylinder'124 is fastened to one of the i'yeaeea side members 22 of the trame 20. A piston rod 126 extends from the lower side of the piston 125 through a packing gland 127 to a lost motion member 128 illustrated in detail in Fig. 14. This member is illustrated in elevation in F ig. 3 but has been eliminated in Figs. 6 and 7 to save space in the drawings. A collar 129 is rigidly fastened to the lower extremity of the piston rod 126, said collar being located within a chamber 130 'of the member 123. A sleeve 131 is adjustably secured within the member 123 and is locked thereto by means oib2 a lock nut 132. A rod- 133 is rigidly :fastened to the sleeve 131 and connects with a piston 134 which is embodied in a retarding mechanism-lt, see Figs. 6 and 7. j

'lhe piston 134 is mounted within a cylinder 135 which is filled with a duid, preterably oii,'and a packing gland 136 is located at the top oi: the cylinder 135 where the piston rod 133 enters said cylinder. 'Located within the piston 134 is a check valve 137, and a plurality of oil ducts 138 connect the check valve 137 with the exterior oi the piston rod above the piston. Mounted upon the cylinder 135 and communicating with the interior thereof adjacent to the top thereoiiis a needle valve I139, and a pipe 140 connects said needle valve with the lower extremity ot the cylinder 135 at a point below the Ylowermost position or the piston 134.

, 'A by-pass valve 141 is mounted upon the cylinder casing 135 adjacent to the upper end of said casing and a spherical valve member 142 of said by-pass valve projects a short distance through the inner extremity oi said valve into the interior of the cylinder 135. A spring pin 143 engages the spherical valve member 142 and acts to normally hold said valve closed. A ley-pass pipe 144 leads from the valve 141 to the pipe 140. Formed integral with thepiston rod 133 at a point adjacent to the lower extremity thereof is a bevelled shouldered portion 145 and said shouldered portion is so positioned that during the upward movement of the piston 134 it will Contact with the portion of the periphery of the spherical valve member 142 which projects into the interior of the cylin-` der 135 and will open the by-pass valve 141 a sufficient amount to allow a portion of the oil located Within the cylinder 135 to pass through the valve 141 and pipe 144 into the pipe 140 without passing through the needle valve 139. This permits thefpiston 134 to move faster during the latter part of its spring actuated push pin 149. A guide member 150 is provided for the purpose of holding the actuating member 148 in position and preventing the piston rod 146 and piston 125 from rotating within the cylinder 124.

. Located just above the pin 149 and in the path of said pin as it moves upwardly is a plunger 151 which is mounted to slide in a bearing member 152 fastened to a side member 22 of the frame 20. The plunger 151 is located at such an angle to the axial line of the piston rod 146 that as the pin 149 moves upwardly, it will push the plunger 151 upwardly and then pass out of contact with said plunger. Theplunger 151 has a plurality of rack teeth 153 formed thereon which mesh with a pinion 154 rigidly fastened to the shaft 74. A

1,55 projects laterally from the periphery of the plunger 151 and as the latter moves upwardly, said pin is .engaged by a latch 156, see Fig. 8, which acts to hold the plunger in its uppermost positionafter the push pin 149 has moved out of engagement with the lower extremity of the plunger. A spring 157 acts to hold the latch 156 in engagement with the pin 155. A link 158 is connected at its lower end to the latch 156 and at its upper end said link is pivotally connected with a release member 159, in

turn pivotally attached at 160 to the bearing member 152.

During the. latter part of the upward movement of the piston 125 the pin 149 of the actuating member 148 will engage the under edge of the release member 159 and will lift the link 158 a sullicient amount to release the latch 156 from the pin 155, whereupon a spring 161 located within the casing 152 and contacting with the upper extremity ofthe plunger 151 will force the latter downwardly to its normal position. The upward movement of the plunger 151 will cause the valve mechanism B to admit the pressure fluid to the

pressing units

30 and 31 simultaneously, and the downward movement of said plunger will shut off said pressure fluid from said pressing units and exhaust the Huid from the fluid compartments 36 and 41.

Located above the timing cylinder 124 and in alignment with the piston'125 and piston rod 146 is a plunger 162 which is slidably mounted within a casing 163 of the locking mechanism L. The plunger 162 is normally held in the position illustrated in Fig. 7 by means of a spring 164.' Rack teeth 165 are provided upon the plunger 162 and said teeth mesh with a pinion 166 which is rigidly fastened to the shaft for the valves C and D. A bolt 167 is slidably mounted within the casing 163 and said bolt is adapted to interlock with a shouldered portion 168 formed upon the plunger 162 when the latter is located in its raised position where it is driven by being engaged by the upper extremity of the actuating member 148. At this time the pressure fluid admitted to the front part of the casing 163 through the pipe 76 forces the bolt 167 toward the right in Fig. 7 and beneath the shouldered portion 168 of the plunger 162, and said bolt will hold said plunger in its raised position until the pressure fluid is exhausted from the casing 163, at which time the spring 167 surrounding said bolt will move the latter toward the left, Fig. 7, out of engagement with the shoulder 168 of the plunger 162, whereupon the spring 164 will again force the plunger 162 downwardly to its normal position. A cap 170 provided for the front portion of the casing163 has a tapered portion projecting inwardly therefrom and providing a stop to limit the movement of the f bolt 167 toward the left in Fig. 7 and prevent a head portion of said bolt from obstructing the passage of the pressure fluid into the casing 163.

The upward movement of the plunger 162 will operate the valves C and D to admit pressure fluid to the rear end of the cylinder 51 and at the same time exhaust the fluid from the front end of said cylinder, while the downward movement of the plunger 162 admits the pressure fluid to the front end of the cylinder 51, and at the same time exhausts the pressure fluid from the rear end of said cylinder.

A bumper 171 is provided upon the main stationary frame 20 for the purpose of preventing the rocker frame 24 from vibrating unnecessarily when the latter is brought to a. vertical position. A

-The general operation of the machine hereinbefore specifically described is as follows Assuming that the upper and lower

pressing units

30 and 31 respectively are located in their normal or open positions as illustrated in Fig. 1 and that the last holder 58 is located in its raised position also as illustrated in Fig. 1, the operator of the machine places a last 57 having the portions of a shoe S loosely assembled thereon upon the last holder which is then rocked downwardly into the lower casing section 37 as illustrated in Fig. 4. At this time the lower pressing member or diaphragm 39 is sagging loosely within the casing section 37 as is also the upper pressing member or diaphragm 34 in the upper casing section 32.

In rocking the last holder 58 downwardly, the shaft 59 of the valve mechanism A is rotated, causing the cam c to operate its lever e to open the check valve a, and causing the ycam d to operate its lever e to close the check valve b. The pressure fluid is now permitted to pass from the tube 71, through the check valve a into the pipe 7 6 and from thence into the casing 163 of the locking mechanism L behind the sliding bolt 167 which, however, at this time is prevented from moving by reason of the fact that its forward. end is contacting with the head of the plungerY 162. At this time the pressure fluid will pass through the casing 163 of the llocking mechanism L, passing through the pipe 7 8 to the valve 103 of the control Valve mechanism M. rlhe check valve 103, however, at this time is closed so that the pressure Huid cannot pass through said valve. At this time, however, the pressure 'fluid can pass from the pipe 78 through the branch pipe 118 to the check valve 105 of the control valve mechanism M and as the check valve 105 is open, the fluid will pass through the

pipes

119 and 121 to the cylinder 124 of the timing mechanism '1 above the piston 125 therein, causing the latter to be held in its lowermost position. At the same time also the pressure fluid will pass from the pipe Z6 through the pipe 79 to the check valve aof the valve mechanism C, which, at this time, is permitted to open` by reason of the fact that the cam c is in engagement with the cam roll f of the lever e. The check valve a of the valve mechanism C being open7 the pressure fluid will pass through said check valve outwardly through the pipe 80 to the front end of the pressure cylinder 51 which it enters through the needle valve 81, and the piston 50 within the cylinder 51 will be moved to rock the frame 24 and lower pressing unit 31 from the inclined position illustrated in Fig. 1 to a vertical position. During this rocking movement of the rocker frame 24 upon which the lower pressing unit 31 is mounted, the toggle links 45 and 46 will be prevented from functioning to raise the lower pressing unit on account of the weight of the latter and by reason of the fact that the guide portions of the support 42 are in engagement with the under surface of the guide plates 54 which prevent the toggle links from straightening out. When, however, the rocker frame 24 reaches a vertical position, the upper bearing member 29 engages the bumper 171 thereby bringing the rocker frame to a stop and the guide portions 55 of the support 42 will be located in alignment with the guideway 56 of the plate 54 and the togglelinks are caused to straighten out and liftthe lower pressino` unit 31, closing the same and locking it tightly against the upper pressing unit 30. When the check valve a, of the Valve mechanism C is open, thecheck valve brthereof is closed, and at the same .time the check valve a of the valve mechanism D is closed and the check valve b of the valve mechanism D is open.

When the piston 50 reaches the forward end of its stroke, it will Contact with the extremity of the rod 94 of the control valve mechanism M, moving said rod within the casing 93 against the tension of the spring 99 and moving all of the parts of the control valve mechanism into the positions illustrated in Figs. 16 and 17. rlhe check `

valves

103 and 104 are now operated simultaneously, the

former to permit the pressure Huid to pass therefrom through the

pipes

112 and 114 to the cylinder 124 of the timing mechanism T beneath the piston 125 therein, causing the latter to rise and permitting the pressure fluid within the cylinder 124 above the piston 125 to exhaust through the

pipes

121, 122 and exhaust port 123. At the time that the

check valves

103 and 104 are open, the

check valves

105 and 106 are closed.

As the piston 125 of the timing mechanism T starts upwardly, it carries with it the piston rod 126 having at its lower end the collar 129 which is located within the lost motion member 128, and the collar 129 being loose within the member 128, the piston 125 will rise quickly until the upper endof the collar 129 engages the inner under side of the member 128, whereupon both the piston 126 and member 128 will move upwardly in unison carrying the pistoni'od 133 and piston 134 of the retarding mechanism R therewith.

l-Vith the first part of the upward movement of the piston 125, the pin 149 of the actuating member 148 will engage the lower extremity of the plunger 151 pushing the latter upwardly against the tension of the spring 161 and rotating the shaft 74 of the valve mechanism B through the rack 153 and pinion 154. Up to this time the check valve a of the valve mechanism B had been closed, so that the pressure fluid provided for the fluid compartments 36 and 41 of the upper and lower

pressing units

30 and 31 respectively has been prevented from reaching said compartments. The shaft 74 now being rotated,` the check valve a of the valve mechanism B is opened and the pressure iuid will pass from the pipe 73 through the check valve a and from thence through the pipe 87, T 88 and

pipes

89 and 90 to the fluid compartments of both pressing units, causing the pressing members or

diaphragms

34 and 39 of the pressing units to expand and be forced tightly against the relatively loose parts 'comprising the' shoe S, causing said parts to ad here tightly together.

As the spring pin 149 pushes the plunger 151 upwardly and finally passes out of contact with the lower extremity of said plunger, the latch 156 will engage the pin 155 which projects laterally from the plunger 151 and said latch will act to hold the plunger 151 in its uppermost position until the pin 149 reaches the under surface of the release member 159, whereupon the latter will be rocked upwardly, lifting the latch 156 from engagement with the pin 155, whereupon the spring 161 will function to again move the plunger 151 downwardly. During this downward movement of the plunger 151, the shaft 74 of the valve mechanism B will be rotated, causing the check valve a thereof to be closed, and at the same time causing the check valve thereof to open, thereby permitting the air within the upper and lower Huid compartments of the pressing units to exhaust through the exhaust port As the piston 125 moves upwardly under the action of the pressure fluid within the cylinder 124C, the upward action of the piston will be retarded by means of a iiuid, preferably oil, which is located within the interior'of the cylinder 135 of the retarding mechanism R, said oil being forced by the piston 134e from the interior of the cylinder 135 through the needle valve 139 and pipe 1110 back into the cylinder 135 beneath the piston 134. The retarding action of the oil will take place until after the valve mechanism B is operated to shut orf the passage of pressure Huid to the lluid compartments 36 and Zl1 ot the pressing units and may be regulated by adjusting the needle valve 139. After the pressure fluid has been exhausted from the

compartments

36 and 11, the shouldered portion 1415 of the piston rod 133 'will contact with the spherical member 142 of the by-pass valve 1111, opening the latter and permitting a portion or' the retarding duid within the cylinder 135 to pass through the valve 141 into the pipe 140 Where it will unite with the pressure fluid that has passed through the needle valve 139 and return to the cylinder 135 beneath the piston 134,-. This action of the b -pass valve 141 will accelerate the action of t e piston 134 during the latter part of yits upward stroke and will, there4 tore, speed up the remainder of the operation of the machine. i

During the latter part of the upward movement of the piston 125, the upper extremity of the piston rod 146 Will contact 1with the lower extremity oi: the plunger 162 moving the latter upwardly against the tension or the spring 164 until the shoulder 168 of said plunger passes above the forward extremity of the bolt 167 which, induenced by the pressure of the duid at its other extremity, will be moved forwardly against the tension of the spring 169 and will hold the plunger 162 in its uppermost position. During the upward movement of the plunger 162, the shaft 65 oit the valve mechanisms C and D `will be rotated, closing the check valve a of the valve mechanism C and opening the checlr valve h ther-eet, and exhausting the pressure fluid trom the front of the piston 50 through the exhaust port At the same time the checlr valve a of the valve mechanism D will be open, permitting the pressure duid to pass therethrough and through the pipe 8d to the rear end of the cylinder 51 which it enters through the needle valve 85. At the same the check valve of the valve mechanism l) Will be closed.

As soon as the piston 51 starts moving away from the rod 911, the latter will be operated by means of the spring 99 to reverse the positions of all of the check valves comprising the control valve mechanism M from that illustrated in Figs. 16 and,17. At this time the pressure duid will be admitted to the cylinder 124 above the piston' 125 through the

pipes

78, 118, 119 and 121, and at t-he same time the pressure fluid is exhausted beneath said piston through the

pipes

114 and 115 and exhaust port 116.

After 4the piston 125 descends,the piston 134 will descend and the oil thercbcneath will pass upwardly through the check valve 137 Within the piston 134i and through the oil ducts 138 into the cylinder 135 above said piston. By this time the rocker frame 2st has been moved to its normal or open position as illustrated in F i 1 and the operator then grasps the last hol er 58 and rocks the same from its closed to its open or normal positie-n and when so doing rocks the shaft 59, thereby closing the check valve a oit the valve mechanism A and opening the check valve l) ot' said valve mechanism. When the check valve a clcsesAhe main supply ot pressure fluid is prevented from entering the valve mechanism A and the pressure Huid that has ofi been located within the

pipes

76, 78, 79 and.

83 is exhausted through the exhaust port y'.

As soon as the pressure duid has been exhausted from the casing 163 of the locking mechanism L, the bolt 167 is moved out of engagement with the plunger 162 by means ot thespring 169, and the spring 161 Will move Vthe plunger 162 downwardly rocking the shaft 75 and causing the variouspcheck valves of the valve mechanisms C and D back to their normal or starting position. rlhe last with thecomplefely pressed shoe thereon 'is then removed from the last holder 58 andv the machine is then ready for operating upon another shoe.

W e claim:

1. A pressing machine of the character described having, in combination', a pressure chamber, Hexible pressing members located Within said chamber, means to support an article to be pressed Within the chamber between said pressing members, iiuid pressure means to expand the pressing inembersf.`

against the article, and fluid means to time the interval during lwhich the article is subjected to pressure bv the pressing members.

2. A pressing machine ot the character described having, in combination, a pressure chamber, flexible pressing members located Within said clfian'iber` means to support an article to be pressed Within the chamber between said pressing members, means to force the` pressing members against the article, tluid means to time the interval during which the article is subjected to pressure by the pressing members, and means to regulate the action of the timing means.

3. A pressing machine of the character de scribed having, in combination, a pressure chamber, lexiblepressing members located Within said chamber, means to support an article to be pressed Within the chamber between said pressing members, fluid pressure means to expand the pressing members against the article, fluid means to time the interval during which the article is subjected to pressure by the pressing members, and valvular means to regulate the action of the fluid timing means.

4. A pressing machine of the character described having, in combination, a stationary pressing unit, a movable pressing unit, a holder for a last mounted upon one of said pressing units and adapted to position a shoe therein, and means actuated by the movement ot the last holder in positioning the shoe within the pressing unit to yautol'natically close the pressing units and supply a pressure fiuid thereto.

5. A pressing machine of the character described having, in combination, astationary pressing unit, a movable pressing unit, a holder for a last mounted upon said movable pressing unit and adapted to position a shoe therein, and means actuated by the movement ot' the last holder in positioning the shoe Within the movable pressing unit to automatically close the latter agalnst the stationary pressingv unit and supply a pressure iiuid to both of said pressing units.

6. A pressing machine of the character described having, in combination, a stationary pressing unit embodying therein an expandible diaphragm, a movable pressing unit embodying therein 'an expandible diaphragm, a holder for a last mounted upon said movable pressing unit and adapted to position a shoe relatively to the diaphragm thereof and means actuated by the movement of the last holder in positioning the shoe to automatically close the pressing units `one upon the other and apply a pressure fluid thereto to expand the diaphragms thereof against the shoe.

7. A pressing machine of the character described having, in combination, a stationary pressing unit embodying therein an expandible diaphragm, a movable pressing unit embodying therein an expandible diaphragm, a holder for a last pivotally mounted upon one of the pressing units and adapted to position a shoe therein, means to close the movable pressing unit against the stationary pressing unit, means to regula-te the speed ot the closing means, and means to expand the diaphragms against the shoe.

8. A pressing machine of the character de scribed having, in combination, a stationary pressing unit embodying therein an expandible diaphragm, a movable pressing unit embodying therein an expandible diaphragm, a holder for a last pivotally mounted upon one of the pressing units and adapted to position a shoe therein, means to close the movable pressing unit against the stationary pressing unit,

means to regulate the speed of the closing means, means to expand the diaphragms against the shoe, and means to time the interval during which the shoe is subjected to pressure.

9. A pressing machine of the character described having, in combination, a stationary pressing unit embodying therein an expandible diaphragm, a movable pressing unit embodying therein an expandible diaphragm, a holder for a last pivotally mounted upon one of the pressing units and adapted to position a shoe therein, means to close the movable pressing unit against the stationary pressing unit, valvular means to regulate the action ot' the closing means, fluid means to expand the diaphragms against the shoe,means totimethe interval during which the shoe is subjected to pressure, and valvular means to regulate the action of the timing means.

y 10. A pressing machine'ot the character described having, in combination, a stationary pressing unit embodying therein an expandible diaphragm, a movable pressing unit embodying therein an expandible diaphragm, a holder .t'or a last pivotally mounted upon one of the pressing units and adapted to position a shoe therein, tluid pressure means to close the pressing units one against the other, duid means to time the action of the closing means, and Huid means to expand the diaphragms against the shoe.

l1. A pressing machine of the character described, having, in combination, a stationary pressing unit embodying therein an errpandible diaphragm, a movable pressing unit embodying therein an expandible diaphragm, a holder for a last pivotally mounted upon one of the pressing units and adapted to position a shoe therein, fluid pressure means to close the pressing units one against the other, fluid means to time the action of the closing means, fluid means to expand the diaphragms against the shoe, and fluid means to time the interval during Which the article is subjected to pressure by the diaphragms.

12. A pressing machine of the character described having, in combination, a stationary pressing unit embodying therein an expandible diaphragm, a movable pressing unit embodying therein an expandible diaphragm, a holder for a last pivotally mounted upon one of the pressing units and adapted to position a shoe therein, Huid pressure means to close the pressing units one against the other and also lock the pressing units in their closed position, means to time the action of the closing means, and Huid means toexpand the diaphragms against the shoe.

13. A pressing machine of the character described having, 1n combination, a main diframe, a stationary pressing unit upon said frame, a rocker frame, a toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slidnvaaeea able upon the rocker frame, a holder for a last pivotally mounted upn one of the pressing units, and means operatively connected to the toggle mechanism and actuated by the movement of the last holder to position the shoe for the pressing operation, to automatically close the movable pressing unit against the stationary pressing unit and supply a pressure Huid toboth of the pressing units.

la. A pressing machine of the character described having, in combination, a main frame, a stationary pressing unit upon said frame, a rocker frame, a toggle mechanism upon said rocker frame, a movable pressing unit supe ported upon said toggle mechanism and slid able upon the rocker frame, a holder or a last pivotally mounted upon the movable pressing unit, and means operatively connect ed to the toggle mechanism and actuated by the movement of the last holder in positioning the shoe within the movable pressing unit to automatically close the latter againts the stationary pressing unit and supply a pressure fluid to both of the pressing units.

l5. A pressing machine of the character described having, in combination, a main trame,

a stationary pressing unit upon said trame, a-

means connected to the toggle mechanism and actuated automatically by the movement ot the last holder in positioning the shoe within the movable pressing unit to close the latter and supply a pressure :Fluid to both otl the pressure units.

16. A pressing machine of the character described having, in combination, a main trame, a stationary pressing unit upon said Jframe, a. rocker frame, a toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slid able upon the rocker frame, a holder tor a last pivotally mounted upon the movable pressing unit, a cylinder, a piston within said cylinder operatively connected to the toggle mechanism, and means to admit a pressure luid to the cylinder whereby the piston is acf tuated to close the pressing units one against the other and supply a pressure fluid thereto.

17. A pressing machine of the character described having, in combination, a main frame, a stationary pressing unit upon said frame, a rocker frame, a toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slidable upon the rocker frame, a holder for a last pivotally mounted upon the movable pressing unit, a cylinder, a piston within said cylinder operatively connected to the toggle mechanism, means to admit a pressure fluid to the cylinder whereby the piston is actuated to close the pressing units one upon the other, to also lock the pressing units in their closed positions and finally supply a pressure fluid thereto.

18. A pressing machine of the character described having, in combination, a main frame, a stationary pressing unit upon said frame, a rocker frame, a toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slidable upon the rocker frame, a holder for a last pivotally mounted upon the movable pressing unit, a cylinder, a piston within said cylinder operatively connected to the toggle mechanism', means to admit a pressure fluid to the cylinder whereby the piston is actuated to close the pressing units one upon the other, to also lock the pressing units in their closed positions and iinally supply a pressure duid thereto, and valvular means to regulate the speed ot the piston.,

19. A pressing machine of the character described having, in combination, a main trame, a stationary pressing unit upon said trame, a rocker `trame, a toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slidable upon the rocker' Jtrame, a holder tor a last plvotally mounted upon the movable pressing unit, a cylinder, a piston within said cylinder operatively connected to the toggle mechanism, means to admit a pressure -uid to the cylinder whereby the piston is actuated to close the pressing units one upon the other and to also loclr the pressing units in their closed positions, and means controlled by the movement ot the piston to admit a pressure fluid to the pressing units.

20. A pressing machine ot the character described having, in combination, a main frame, a stationary pressing unit upon s a1d frame, a rocker trame, a toggle mechanism upon said rocker trame, a movable pressing unit supported upon said toggle mechanism and slidable upon the rocker frame, a holder for a last pivotally mounted upon the moyable pressing unit, a cylinder, a piston within lll@ lila

said cylinder operatively connected to the i,

toggle mechanism, and valvular means actuated by the movement of the last holder to admit a pressureuid to the cylinder whereby the piston therein is actuated to close the pressing units one ,against the other and sup-I ply a pressure fluid thereto.

2l. A pressing machine of the character described having, in combination, a main frame, a stationary pressing unit upon sind frame, a rocker frame, a toggle mechanism upon said rocker frame, a. movable pressing unit supported upon said toggle mechanism and slidable uponthe rocker frame, a holder for a last pivotally mounted upon the moyable pressing unit, a cylinder, a piston within said cylinder operatlvely connected to the toggle mechanismymeans to admit a pressure fluid to the cylinder whereby the piston is actuated to close the pressing units one against the other and supply a pressure Huid thereto, and means to regulate the action of the closing means.

22. A pressing machine of the character described having, in combination, a main frame, a stationary -pressing unit upon said frame, a rocker frame, a toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slidable upon the rocker frame, a holder :for a last pivotally mounted upon the movable pressing unit, a cylinder, a piston within said cylinder operatively connected tothe toggle mechanism, means to admit a pressure fluid to the cylinder whereby the piston is actuated to close the pressing units one against the other and supply a pressure fluid thereto, and valvular means to regulate the flow of fluid to the cylinder whereby the speed of the closing means is varied.

23. A pressing machine of the character described having, in combination, a' main frame, a stationary pressing unit upon said frame, a rockerI frame, a toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slidable upon the rocker frame, a hol-der for a last pivotally mounted upon the movable pressing unit, a cylinder, a piston within said cylinder operatively connected to the toggle mechanism, means to admit a pressure fluid to the cylinder whereby the piston is actuated to close the pressing units one against the other and supply a pressure fluid thereto, and means to'time the interval during which the shoe is subjected to pressure.

24. A pressing machine of the character described having, in combination, a main frame, a stationary pressing unit upon said frame, a rockerirame, a toggle mechanism upon said rocker frame, a movable pressing unit supportedl upon said toggle mechanism and'slidable uponthe rocker frame,a holder for a last pivotally mounted upon the movable pressing u nit, la cylinder, a piston within said cylinder operatively connected to the toggle mechanism, means to admit a pressure Huid tothe cylinder whereby the piston is actuated toclos'e the pressing units one' against the other, and means actuated by the movement of the piston in closing the pressing units to admit a pressure liuid to the latter to press a shoe.

25; A pressing machine of the character described having, in combination," a main frame, a stationary pressing unit upon Said frame, a rocker frame, a toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slidable upon the rocker frame, a holder for a last pivotally mounted upon the movable pressing unit, a cylinder, a piston within said cylinder operatively connected to the toggleA mechanism, means to admit a pressure fluid to the cylinder whereby the piston is actuated to close the pressing units one against the other and supply a pressure iuid thereto, fluid means to time the interval during which the shoe is subjected to pressure, and valvular means to regulate the action of the fluid timing means.

26. A pressing machine of the character described having, in combination, a main frame, a stationary pressing unit upon said frame, a rocker frame, a toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slidable upon the rocker frame, a holder for a last pivotally mounted upon the movable pressing unit, a cylinder, a piston within said cylinder operatively connected to the toggle mechanism, means to admita pressure fluid to the cylinder whereby the piston is actuated to close the pressing units one against the other and supply a pressure fluid thereto, a timing cylinder, a piston within said timing cylinder, means controlled by the movement of the firstmentioned piston to admit a pressure fluid to the timing cylinder to actuate the piston therein, and means to retard the movement o said last-named piston.

27. A pressing machine of the character described having, in Combination, a main lrame, a stationarygpressing unit upon said frame, a rocker frame, a toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slidable upon the rocker frame, a holder lfor a last pivotally mounted upon the movable pressing unit, a cylinder, a piston within said cylinder operatively connected to the toggle mechanism, means to admit a pressure fluid to the cylinder whereby the piston is actuated to close the pressing units one against the other and supply a pressure fluid thereto, a timing cylinder, a piston within said timing cylinder, means controlled by the movement 'of the'irst-mentioned piston to admit a pressure uid to the timing cylinder.

to actuate'the piston therein, linid'means to Iretard the movement of said last-named piston,"and valvular means to control the fiow of said last-named :duid means thereby timing the interval during which the shoe is subjected to pressure.

28. A pressing' machine of the character described having, in combination, a main frame, a stationary pressing unit upon said frame, a rocker frame, a` toggle mechanism upon said rocker frame, a movable pressing unit supported upon said toggle mechanism and slidable upon the rocker lframe, a holder for a last pivotally mounted upon the movable pressing unit, a cvlinder, a piston within said cylinder operatively connected to `the toggle mechanism, means to admit a pressure fluid to the cylinder whereby the piston is actuated lto close the pressing units one ton,` valvular means to control the ow of said last-named fluid means thereby timing the interval during which the shoe is subjected to pressure, and valvular means actuated by the movement of said last-mentioned piston to exhaust the pressure fluid from the pressing units.

In testimony Whereoil We have hereunto set our hands.

JOSEPH E. PERRAULT. LOUIS J. SCHROEDER.