US3019461A - Sole rounding machines - Google Patents

Description

Feb. 6, 1962 w. SENFLEBEN SOLE ROUNDING MACHINES 9 Sheets-Sheet 1 Filed May 12, 1960 Attorney Paul h/Janf/eben By his lllllllll I Feb 1962 P. w. SENFLEBEN 3,019,461

SOLE ROUNDING MACHINES Filed May 12, 1960 9 Sheets-Sheet 2 Feb 1962 P. w. SENFLEBEN 3,019,461

SOLE ROUNDING MACHINES Filed May 12, 1960 9 Sheets-Sheet 3 Feb. 6, 1962 P. w. SENFLEBEN SOLE ROUNDING MACHINES 9 Sheets-Sheet 4 Filed May 12, 1960 Feb. 6, 1962 w. SENFLEBEN SOLE ROUNDING MACHINES 9 Sheets-Sheet 5 Filed May 12. 1960 Feb. 6, 1962 P. w. SENFLEBEN SOLE ROUNDING MACHINES 9 Sheets-Sheet 6 Filed May 12, 1960 in g 0 3w kw Ag Ms Q s Feb. 6, 1962 P. w. SENFLEBEN 3,019,461

SOLE ROUNDING MACHINES Filed May 12, 1960 9 Sheets-Sheet 7 Feb. 6, 1962 P. w. SENFLEBEN 3,019,461 SOLE ROUNDING MACHINES Filed May 12, 1960 9 Sheets-Sheet 8 Feb. 6,196 P. w. SENFLEBEN SOLE ROUNDING MACHINES Filed May 12, 1960 9 Sheets-Sheet 9 United States Patent Ofiice sets-vast Fatenterl ti, ltifiZ 3,l9,4ol lhOlJNDllltZ-l- MAQH I'NES Paul W. Senilehen, Beverly, Mass, assignor to United fihoe Machinery @Corporatiou, Flemington, Ni, 21 con partition of New lersey Filed May 32, T1969, Ser. N 283% 14 Qlaims. (*Jl. l2=-=l7.2)

Tris invention relates to shoernaking machines of the type employed in performing an operation upon the periphery of a shoe and is illustrated herein as embodied in a machine, for rounding the soles of shoes, such as that disclosed in eith of United States Letters latent No. 2,825,076, granted on March 4, 1958, upon an application of G. W. Cleversey, or United otates Letters Patent No. 2,869,156, granted on January 26, 1%59, upon an application of E. W. Stacey.

In the use of the patented machine referred to above, a shoe to be operated upon is presented to a cutter head upon a jack which is oscillated with a variable stroke ac cording to the size of the shoe, the shoe also being constantly rotated upon the jack. The cutter head is mounted for movement toward and away from the jack, is constantly biased into engagement with the shoe and, under the guidance of the shoe, has such shoe following movements directed toward and away from the jack as are necessary to cause continuous contact between the shoe and the cutter head to be maintained.

In order to obtain the optimum relation between the shoe and the cutter head at all times, the oscillatory and rotative movements of the jacks are so combined that the direction of movement of the shoe, at the point where it is operated upon by the cutter head, always conforms as nearly as possible to the direction of the sole edge at this point. Moreover, the shoe at the point being operated upon also is moved as nearly normal as possibl to the shoe following movement of the cutter head for the purpose of minimizing movement of the cutter head as well as variations in its bearing pressure against the shoe. The foregoing motions are obtained by a jack design predicated on the fact that the shoe is centered upon the jack, i.e., mounted with the mid point of the shoe bottom at the axis of rotation of the jack. Hence, it is evident that the efiicacy of the design will not be realized unless the shoe is centered in this manner upon thejaclr.

'lo this end, provision has already been made, as in the above-mentioned patented machine, for shoe lengthwise thereof accurately upon a jack by means of operator-controlled gaging means. However, if this gaging means is not adjusted properly for the size of shoe being operated upon, or if the operator neglects making any such adjustment, it is evident that the most advantageous relationship between the work and the cutter head will not he obtained.

in view of the foregoing, it is an object of the invention to center a shoe, regardless of its size, upon the jack of a machine of the type under discussion automatically and, hence, without requiring any attention on the part of the operator.

In the pursuance of this object, there is contemplated the use or" lasts, characterized by the fact that they have size indicating surfaces disposed in different positions designating the sizes of the lasts, with a novel jacl; construction which utilizes the size indicating surface of the last thereon to position each last, re ardless of its size, with the midpoint of the bottom of the shoe on the last at the axis of rotation of the jack.

in the illustrated construction, a last of the above type carrying a shoe to be operated upon is mounted upon a jack which, in accordance with one feature ofthc invention, comprises a holder for the last which is mounted for last positioning movement lengthwise of the last and positioning a further comprises a last size sensing element for limiting the last positioning movement of the holder, by engagement with the size indicating surface of the last, when the midpoint of the bottom of the last will have been brought to the axis of rotation of the jack.

in order to support the forepart of the last, as well as to it securely upon the jack in the position referred to above, the invention also provides, in accordance with a further feature thereof, means for engaging the forepart of the last and exerting a clamping pressure upon it so as to cause it to be held at the extremity of its positioning movement, against the sensing element, and also cramped upon the holder to insure against accidental displacement of the last on or its removal from the holder.

in the above-mentioned patented machine, the jack is rotatably mounted upon an oscillating swing arm, and provision is made for varying the amplitude of oscillation of the swing arm, in accordance with the size of the shoe to be operated upon, by manually adjusting a fulcrum for a lever in the operating mechanism for the swing arm. As this adjustment is made by the operator, if he fails to make it properly or neglects to make it altogether, the amplitude of oscillation of the jack may not. correspond to the size of the work, to the detriment of the abovementioned relationship between the shoe and the cutter head, particularly when the end portions of the work are operated upon.

It is, therefore, a further object of the invention to control the amplitude of oscillation of the jack in accordance with the size of the last and shoe onthe jack, without requiring any attention on the part of the operator.

To this end, the illustrated machine, which includes the above-mentioned swing arm operating mechanism of tie patented machine, is also provided, in accordance with a further feature of the invention, which for automatically adjusting the amplitude of oscillation of the swing arm appropriately for the size of the shoe on the jack. More specifically, this means is associated with the above-mentioned fulcrum for the swing arm and imparts a setting movement to the fulcrum, at the beginning of each operating cycle of the machine, of an extent corresponding to tr e length of the above-mentioned centering movement of the work upon the jack. The above and other objects and features of the invention will now be disclosed in greater detail in the following spccificetion and will be set forth in the appended claims.

in the drawings,

FIG. 1 is a side elevation of an illustrative machine embodying the invention, as viewed from the right;

FIG. 2 is a sectional plan view of the jack driving mechanism;

FIG. 3 is a plan view of a part of the jack driving mechanism and control mechanism therefor;

FIG. 4 is a diagrammatical View of the fluid system of the machine;

FIG. 5 is a front elevation of the jack;

FIG. 6 is a side elevation of the jack and a portion of the control mechanism for the jack driving mechanism, as viewed from the right;

FIG. 7 is a side elevation of the jack as viewed from the left;

FIG. 8 a perspective view of the holder for a last mounted upon the jack;

FIG. 9 is a sectional front elevation of the structure of FIG. 8, the section being taken parallel to and forwardly of the longitudinal center line of the jack; and

FIG. 10 is a diagrammatical showing of the electrical features of the control mechanism for the fluid system and jack driving mechanism.

The illustrated machine comprises a cutter head lll 3 which normally is in an inoperative position, as illustrated in FIG. 1, retracted from a jack 12 for holding a lasted shoe upon which a sole rounding operation is to be performed. The illustrated cutter head 1% is substantially the same as that disclosed in the patented machine and has a chopping knife 14 which cooperates, in shearing relation, with an anvil 16 which is fixed upon the cutter head. The rounding out is made under the control of a gage 18, the forward end of which bears against the side of the shoe upper contiguous to the welt crease when the cutter head is in operative relation to the work and, at this time, the upper surface of the Welt is seated upon the upper sides of the gage and anvil. A yieldingly mounted bottom rest 2%) rolls upon the bottom of the sole adjacent to the knife and urges the upper surface of the welt against the gage 18 and anvil 16.

The illustrated jack 12, in which certain features of the present invention are embodied, is rotatably mounted, like the jack in the patented machine, upon the forward portion of a swing arm 22 having at the rear thereof a sleeve 24 (FIG. 2) which is mounted to oscillate about a vertical axis in the base 26 of the machine. One complete transfer of the point of operation of the cutter head upon the shoe about the periphery thereof is effected by simultaneously rotating the jack counterclockwise through one revolution upon the arm 22 and oscillating the arm back and forth, first to the left through a portion of its stroke, next to the right through a full stroke, then to the left through a full stroke, and finally, to the right to the original starting point.

To permit engagement of the cutter head with the shoe to be maintained throughout a cycle of operation of the jack, the cutter head is mounted to swing about a pivot at 28 (FIG. 1) upon a carriage 30, as the level of the sole at the point being operated upon rises and falls, the

carriage being biased toward the jack along a horizontal slideway 32 which is adjustable height'wise" on a pedestal 34 fixed upon the base 26. A spring 36 abutting an arm 38 on the carriage 30 biases" rearwardly a rod 40, which is pivoted upon the cutter head 10, so as to counterbalance the cutter head. The carriage is operated by mechanism comprising a fluid operated piston 42 in a cylinder 44 fixed upon the pedestal 34, a bell crank 46 driven by the piston and a link 48 which connects the bell crank and the carriage. The cutter head 10 is brought into and out of engagement with the shoe and is held against the shoe throughout the rounding operation by the application of a variable fluid pressure to the piston 42, as disclosed in the above-mentioned Cleversey patent.

The jack 12 has a base 50 which is fixed upon a support 52 rotatably mounted in the arm 22, the support being driven by a train of gears (not shown) housed in the arm, one of these gears being fixed upon the upper end of a shaft 54 (FIG. 2) which is mounted for rotation within the above-mentioned sleeve 24. A gear 56, fixed upon the lower portion of the shaft 54, is rotated with a variable velocity by a gear 58 under the control of mechanism comprising a fixed cam 60. This mechanism is driven by other gears comprising an idler gear on the shaft 54, like and directly below the gear 56, and meshing with another gear 62 which is driven by a pinion 64. The latter pinion is driven, through a clutch to be referred to later, from a motor driven reduction gear unit 66 (FIG. 1). The gear 62 is fixed upon a vertical shaft 68 which is rotatably mounted in the base 26.

In a cycle of operation of the machine, the gear 62 makes one complete revolution during which the arm 22 is swung in the manner stated above by the following connections.

A cam 74} (FIG. 2), fixed upon the shaft 68, is engaged by a roll 72 on a bell crank 74- which is pivoted at 76 upon a bracket '78, the latter being fixed upon the base 26. The bell crank isconnected by a link 8% to one end of a lever 82, to the other end of which is pivoted a link 84 connecting the lever 82 with an arm 86 which is fixed upon the sleeve 24. The link 84 is urged to the left, causing the roll 72 to be held against the cam 70, by a spring 88 which biases a rod 9%) to the right and tensions a chain 92 which connects the rod with the above-mentioned link 84. The right-hand end of the link 84 moves in a path controlled by a link 94 which is pivoted to the link 84 and also to the bracket '78. In the mid portion of the lever 82 there is an elongated slot 95 which receives a fulcrum block 96 (FIG. 3), the latter being adjustable within the slot so as to vary the lengths of the arms of the lever 82 and, hence, the amplitude of oscillation of the arm 22.

The structure referred to thus far, except for the bracket 78 and mounting for the fulcrum block 96, is the same as the corresponding structure shown in the above-mentioned patents, to which reference may be made for a more detailed description of these parts. The present invention is concerned, more particularly, with a novel jack, having provision for locating lasts, regardless of their size, in a predetermined centered position on the jack and, associated therewith, means responsive to the centering movement of the last and work upon the jack for automatically setting the fulcrum block so as to cause the amplitude of oscillation of the jack to be appropriate for the size of the work.

Although a jack embodying the invention may be de signed to accommodate any type of last, the illustrated jack is particularly suited for use with geometrically graded lasts of the type disclosed in United States Letters Patent No. 2,806,233, granted on September 17, 1957, upon an application of A. R. Hubbard et a1. Such lasts are characterized by the fact that the dimensions of lasts of different sizes vary according to a constant ratio or gradient and that each last has a positioning plate 98 fixed upon the top of its heel part. The last L shownherein (FIG. 9) is a modification of the patented last above referred to because of the provision therein of a.- size indicating hole 100 which extends vertically into the last through the positioning plate to a depth correspond ing to the size of the last. In a family of lasts, the depthsof the holes 100 represents the sizes of the lasts; and in a series of geometrically graded lasts, the depths of the holes are graded according to the gradient or grading ratio of the lasts. Thus, regardless of the type of last its surface at the bottom of the hole 190 is a size indicating surface which designates the size of the last. 7

A last L carrying a shoe to be operated upon is supported upon the illustrated jack by a holder 102 (FIGS. 8, 9 and 5) from which there projects upwardly a pin 194 adapted to be received in the usual thimble 106 in the heel part of the last. The holder is provided with a pair of lugs 198 which are spaced so as to receive closely the forward end of the positioning plate 98 on the last, whereby the last is accurately oriented upon the holder. A spring clip 116 mounted upon the holder becomes engaged within a notch 112 in the rear end of the positioning plate when the last is fully seated upon the holder and releasably holds the last in this position. The holder at opposite sides thereof has tongues 114 which slide freely in horizontal grooves 116 formed in a carrier 11% to permit adjustment of the holder upon the carrier length wise of the last. This adjustment is effected by a screw' 119 threaded in the holder, the head of the screw being received in a recess in the carrier. The carrier has a pairof rolls 120 at each side thereof which are received in in-- clined grooves 121 formed in the inner sides of a cradle 122, the slope of the grooves 121 conforming to the ratioof the changes in length and height of lasts of differentsizes. Provision is thus made for simultaneously moving the holder heightwise and lengthwise of the last accordingto its grading ratio or gradient and, for this reason, all lasts of a series, regardless of their size, may be centered upon the jack with their bottoms at the same level.

The cradle has an arcuate groove 123 FIGS. 5, 6 and 7) formed in each side thereof and each groove receives.

bracket 78 and has an adjustable stop screw a pair of rolls 1'24 rotatably mounted upon the base 5 permitting the jack to have such pitching movement as is necessary to keep the shoe bottom level at the point Where it is operated upon by the cutter head ltd. This pitching movement is imparted to the cradle by mechanism, like that in the above-mentioned Cieversey rnachine, comprising a gear 126 on the cradle, a vertical rack 12%;, and a double pinion 113i? rotatably mounted upon the base in mesh with the gear and rack. As this mechanism is fully described in the above-mentioned Cleversey patent and forms no part of the invention, it will not be further described herein.

The carrier 118 is normaily disposed at the righthand extremity of its travel, in a loading position slightly to the right of that which it occupies when a last of the smallest size to be used is centered upon the jack. With a last on the holder 'n the loading position, a pin 132, for sensing the size of the last, mounted movement vertically through the top of the holder l d-2 into engagement with the size indicating surface of the last at the bottom of the hole 1%, projects slightly into the hole. This pin is fixed -t its lower end to a bar 334 (FIGS. 8 and 9) which is arranged to slide vertically within a slot in the holder Upon each end of the bar there is rotatably mounted a roll 1533, these rolls being received in horizontal grooves in the inner sides of guide plates 1&2, one of which is fixed upon each side of he cradle it will now be evident as the holder 1522 is lowered with movement thereof toward the left, the pin 132 will rise relatively to the holder until it engages the last at the bottom of the hole 1%, whereupon further movement of the holder to the left is prevented. Thus, each last, regardless of size, is centered upon the jack with the midpoint of its bottom at the axis of rotation of the jack and with the last bottom at a predetermined level which is the same for all lasts.

Different styles of lasts may require different settings of the holder 1G2. lengthwise of the carrier it'd, and such adjustment of the holder is etiected by the above-mentioned screw 119.

Upon the initiation of a cycle of operation of the machine, the above-mentioned fulcrum block as (FIG. 3)

pfCSen L is set, lengthwise of the slot 5 in the lever $25, in a position determined by the position of the last holder 1 32. when the last will have been cente ed upon the jack in the manner described above; and, with the fulcrum block in this position, the lengths of the arms of the lever $21 at each side of the block are such as to cause the of oscillation of the arm 2-2 and jack to correspond to the size of the work.

The fulcrum blG-Cli as is pivoted by means of a stud 14% upon a slide 14d which is mounted to slide upon the 166 which, by engagement with the rearward portion of the bracket opposite thereto, limits rearward movement of the slide and determines its initial position. The stud 143 is fixed upon a piston rod 147 the end portions of which are received in cylinders M3 15% formed in the bracket '73. Fluid under pressure is supplied to these cylinders through pipes 152, 154, respectively, to move the piston rod 147 to and fro in a manner to be described below. When the machine is at rest, fluid pressure is supplied to the cylinder 1 5d, whereby the slide 14 and block 96 are held in their initial positions. At the beginning of each cycle of operation of the machine, the bloclr as moved into its operative position under the control of an adjustable microswitch M85 and a solenoid operated valve (FIG. 4-) which is first set to direct pressure through the pipe 152 to the cylinder id? and to vent the cylinder 15% through the pipe When a shoulder lid! on the slide 144 strikes and operates the microswitch M85, the valve 156 resumes a centered position and prevents any fiow of fluid into or out of the cylinders 14-8, 156, whereby the block 96 is hydraulically locked in its operative position. The microswitch M55 is fixed upon a plate 36d (FIGS. 3

and 2) which at its left-hand side slides in a guideway formed in the bracket 78 and at its other side is fixed upon a rod 162, the latter being mounted to slide in the bracket T t parallel to the piston rod 147 and set response to the ce'mring movement of 2st holder through contractions to be described later,

A piston E64 (PEG. 3) is mounted to slide forward and away from the jack in a cylinder 166 formed a member 158 which is fixed upon the top of the arm Upon the forward end of the piston 164 there is fixed a yoke 17%? having an arcuate slot 172 which is concentric with the axis of rotation of the jack upon the arm 22 and receives a roll 174 mounted upon the rearwtnd end of a rod 176. This rod is mounted to slide in the base 50 of the jack and carries an arcuate bar 178 (E68. 5 and 7) which is concentric with the above-mentioned grooves 123 in the cradle 122 and has rotatably mounted thereon a roll llSli which runs in a horizontal groove 1182 formed in the base 5%, whereby rotation of the bar 178 and rod I176 about the axis of the rod is prevented. The upper side of the bar 178 is provided with a groove 1% which receives a roll 1% carried by a member 138 the latter being mounted to slide freely between the sides or" the cradle E22 upon a rod Eli which spans the sides of the cradle. The member 138 is slotted at 192 to receive a rod 194 fixed in the sides of the cradle, whereby rotation of the member 13% upon the rod 1% is prevented. A rack 196, fixed upon the member 188, meshes with a pinion 1%? (PEG. 5) which is rotatably mounted in a strut 2 13i} fixed upon the inner sides of the cradle. Another pinion Zii'Z, integral with the pinion 1%, meshes with a rack which is fixed upon the bottom of the carrier 118.

Fluid pressure is supplied to the cylinder 154, at the end of a cycle of operation of the jack, through a pipe 2% (FIGS. 3 and 4) under the control of a valve 2% (FIG. 4), to return the holder 3W2 to its loading position. In response to each centering movement of the holder and through connections driven from the piston tea, the above-mentioned microswitch M is set in a position corresponding to the size of the last on the holder, as will now be described.

A casing 21d fixed upon the member 163 houses a pinion 212 which meshes with one racl; 21d mounted to slide in the casing and also With another rack 216 formed upon the piston 164. A Bowden cable 22% connects the rack 21d and a rod 22% which is mounted to slide in the bracket '78 and is pivotally connected to a le er Z22 fulcrumed at 2124 upon the top of the cylinder 15b. The lever 222 is connected to the rod 162 by a link 2nd. By this means, for any movement or position of the holder 192 a corresponding movement or position is imparted to the microswitch M85. Upon forward movement of the piston rod 146 and the operation of the microswitch M85 by the shoulder 15! on the slide 144, the valve 156 resumes its centered position, causing the fulcrum block 96 to be set and hydraulically locked in its adjusted position. Thus, the amplitude of oscillation of the jack is adiusted appropriately for the size of the Work thereon.

Before the jack is operated to present the periphery of the shoe to the cutter head, a support 228 (FIG. 5) is brought forcibly, in a sloping direction, into engagement with the top of the instep portion of the last to cause the last to be cramped, in its centered position, firmly upon the holder Hi2 and pin Edd. At the same time, a locking ring 23% (FIG. 3), housed in the member res and encircling the piston 164, is closed against the piston by a fluid operated plunger 2&2. to lock the piston in its position determined by the roll 174 The yoke 17b is thus held, during the rotation of the jack, so that the roll 174 will freely enter the slot F32 in the yoke at the end of the movement of the jack. The support (FIG. 5) is at the upper end of a piston 23- 1- which slides Within a cylinder ass, the latter being fixed between the sides of the cradle 120. A spring 237 stretched between the lower end of the cylinder 236 and the support urges the piston 234 downwardly toward a retracted position and a bar 233 fixed upon the cylinder cooperates with a land on the piston 234 to prevent it from turning. Fluid pressure is supplied to the cylinder 236 and the lock for the piston 164 through pipes 2 24i, 2 52 (FIG. 4), respectively, under the control of a solenoid operated valve 246.

Upon the completion of a cycle of operation of the jack, the valve 156 is set so as to supply fluid pressure to the cylinder 156 and cause the fulcrum block 96 to be returned in its initial position; the valve 24s is set so as to vent the pipes 24%, 242, permitting the retraction of the support 228 and causing the release of the locking ring 236 from the piston 164; and the valve is set to supply fluid pressure to the cylinder 166, whereby the piston res drives the work and the holder M2 to the right and back to its original loading position, this action also being accompanied by the return of the microswitch MSS to its original position.

Fluid pressure for the system is provided by a motor driven pump see (FIG. 4) which draws fluid from a tank 250 and delivers it through a pipe 252 to another pipe 254 which supplies fluid pressure to the valve 156. Pipes 256 and 258, connected to the pipe 25 supply fluid pressure to the valve 203 and valve 246, respectively. A pressure relief valve 26% maintains the desired fluid pressure in the system.

Other parts of the fluid system and features of the illustrated machine which are duplicated in the prior patented machine but are related to the present invention, only because of their involvement in the operation of the jack, will now be referred to. The above-mentioned pipe 254 supplies fluid pressure to a valve 260 which, in one setting, directs fluid pressure through a pipe 262 to the lower end of the cylinder 44 for causing the retraction of the cutter head It? from the jack. In the other setting of the valve 26! it directs fluid pressure through a pipe 264 into the upper end of the cylinder 44 so as to advance the cutter head toward the jack and hold the cutter head against the shoe throughout the rounding operation with a variable pressure, the latter pressure being under the control of a valve 266 which is operated by a cam 2&8 (FIG. 1) at the lower end of the shaft 68. This cam is the same as the cam 12%) in the Stacey machine.

Among the principal elements of the electrical control system for the machine is a microswitch MSl which is mounted upon the cutter head and is normally depressed by a finger 279 fixed upon the upper end of a rod 272 carrying the above-mentioned bottom rest it The rod 272 is mounted to slide axially thereof in the cutter head and is biased downwardly by a spring which seats upon a block 276 on the rod. When in its lowermost position, the bottom rest it) is at, or just above, the level of the anvil lo and gage 1%, this position being determined by the engagement of the finger 270 with the frame of the cutter head. To facilitate the presentation of the cutter head to the Work, the bottom rest is raised by pressing rearwardly upon a lever 27%; which is pivoted upon the cutter head and is connected by a link 28% to the block are in such a manner that the link and lever constitute a toggle. Such lifting of the bottom rest 20 releases microswitch M51 and causes the advance of the cutter head toward the jack. A microswitch M52 is provided on the cutter head for initiating each cycle of oporation of the jack driving mechanism. A microswitch M56, which is fixed upon the base 26 of the machine, is normally depressed by a small lobe 23?; on a earn 284- Which is fixed upon the upper end of the above-mentioned shaft 68. This microswitch, when depressed at the end of a cycle of operation of the jack, causes the retraction of the cutter head from the jack. Microswitches MS-dA and MS43 are associated with the pedestal 34 and are simultaneously depressed by the carriage 3% upon the return of the cutter head into its retracted position to cause the unclamping of the work and the unlocking of the piston 16 i.

interposed between the output shaft of the unit 65 and the above-mentioned pinion 64 is a clutch mechanism like that disclosed in the above-mentioned Stacey patent (MG. 16). The clutch in the patented machine is engaged by depressing its treadle 42 to which a treadle 29% (PEG. l) of the illustrated machine corresponds. The treadle 2% is pivoted at 2% upon the base of the machine and is connected by a link 294 to a bell crank 2% also pivoted upon the base of the machine. A link 2% connects the bell crank 296 with another bell crank 30d pivoted upon the base 26 and having an arm disposed behind a spring biased bar 302 which operates the clutch. A notch in the bar 332 receives an arm 3% fixed upon the lower end of a shaft which is rotatably mounted in the base as and carries at its upper end another arm 3%. The latter arm has on its rearward end a roll which runs upon a cam 363 (like earn 155 in the Stacey machine) which has a single notch in its periphery and is mounted upon the lower portion of the shaft 63.

It is suliicient to state for purposes of disclosure of the present invention that when the bell crank 390 is rotated clockwise (as by depressing the treadle 29th), the bar 332 is released from the arm 3154 and the clutch is engaged, whereupon a revolution of the shaft 63 is initiated. At the end of a revolution of this shaft, the notch in the cam 3138 is presented to the roll on the arm 3% which allows the arm 304 to become seated in the notch in the bar 392 and, with sli ht further rotation of the cam 361$, the arm 304 acts upon the bar 392 to disengage the clutch, whereby a cycle of operation of the jack driving mechanism is terminated.

While the tripping of the clutch in the illustrated machine may be etfected by depressing the treadle 2%, it is normally done by a solenoid S11 which is connected to an arm 310, integral with the bell crank 300, in such a manner that when the solenoid is energized the bell crank is swung clockwise. The solenoid S11 is energized when a microswitch M82 on the cutter head 10 is depressed by the operator, as will be explained below.

A cycle of operation of the machine will now be described with reference to FIG. 10. The pump 243, the knife 14, and the driving unit 66 are assumed to be in operation.

Upon depressing the start switch, coil C is energized and the associated contactors CA and CB are closed. The contactor CA completes a holding circuit for the coil C and, through the contactor CB and the lower contacts of MS a circuit includin coil K6 is completed whereby this coil also is energized. With coil K6 energized, the normally closed contactors K6A, K6B and K6D are opened but the normally open contactor KC is closed, causing solenoid Slit to be energized and the valve 156 to be set (to the left) whereby fluid pressure is directed to the cylinder and the slide 144 is held in its initial position. The solenoid S13 not being energized at this time, the valve 246 is set so as to vent the pipes 24%, 242. Thus, the support 228 is in its retracted position and no locking effect is exerted upon the piston 164 by the locking ring 230. As the solenoid S14 is now decnergized, the valve 2% is set so as to vent the pipe 2%, permitting a work piece on the holder 192 to be moved freely by the operator into its centered position upon the jack; and in response to such movement, the microswitch MSS is moved forwardly into a position corresponding to the size of the work.

With the cutter head ill still in its retracted position, microswitches MS lA and M843 are held in the position shown in FIG. 10. Accordingly, solenoid S8 is deenergized as is solenoid S7 also because its circuit cannot be energized when the microswitch M51 is depressed. Thus, the valve 26% is centered, causing the cutter head to be hydraulically locked in its retracted position.

1 1 jack, and means connecting said centering means and said adjustment for setting the latter according to the position of said centering means whereby the stroke of the jack conforms to the size of the shoe thereon.

4. In a shoe machine, an operating head, a rotatable jack for a last carrying a shoe, said jack being mounted to oscillate as it rotates progressively to present the periphery of the shoe to said head, adjustable driving means for imparting a variable amplitude of oscillation to said jack, said jack comprising a last holder mounted for movement lengthwise of the shoe and centering means for positioning the shoe with the mid point of its bottom at the axis of rotation of the jack, means for setting said riving means, and means operated by said centering means for controlling said setting means to cause the amplitude of oscillation of said jack to correspond to the size of the shoe on the jack.

5. In a shoe machine, an operating head, a jack for a last, an oscillating arm upon which said jack is mounted to rotate, driving means for oscillating said arm as said jack rotates thereon to cause a shoe on the last to be presented to said head, said driving means comprising a lever having an adjustable fulcrum which is movable from an initial position into a variable operative position to control the amplitude of oscillation of said arm, said jack comprising a last holder mounted thereon for last positioning movement lengthwise of the last, last centering means for limiting the positioning movement of said holder when the mid point of the last bottom is brought to the axis of rotation of said jack, and means for imparting a setting movement to said fulcrum corresponding to the last positioning movement of said holder.

6. In a shoe machine having an operating head and a jack for a last which is movable through a path of variable extent to present a shoe on the last to said head, adjustable driving means for operating said jack with a scope of movement corresponding to the size of the shoe, said jack comprising a last holder mounted for last positioning movement thereon lengthwise and heightwise of the last simultaneously to permit the bottoms of lasts of different sizes to be positioned lengthwise thereof with respect to said jack and head at a constant level, said jack also comprising a last size sensing element mounted for movement relatively to said holder heightwise of the last in response to said last positioning movement of said holder whereby said element is brought into engagement With the last and the last positioning movement of said holder is limited when the last is positioned upon the jack, and means operated in response to the last positioning movement of said holder for adjusting said driving means.

7. In a shoe machine having an operating head and a jack for a last carrying a shoe which is movable progressively to present the shoe to said head, said head being operable through advancing and retractive movements into and out of operative relation to the shoe, driving means for imparting a cycle of movement to said jack, said driving means comprising a member which is adjustable to vary the scope of movement of said jack, mechanism actuated in response to advancing movement of said head for imparting a setting movement to said member, said jack comprising a last holder mounted for positioning movement thereon lengthwise and heightwise of the last to position the last with respect to said head and jack, said jack also comprising a last size sensing element mounted for movement with respect to said holder into engagement with the last to limit the movement of said holder whereby the last is located in its operative position upon the jack, and means operated in response to the movement of said holder lengthwise of the last for limiting the operation of said mechanism whereby a setting movement is imparted to said member in accordance with the positioning movement of said holder.

8. In a shoe machine having an operating head and a jack for a last carrying a shoe which is movable progressively to present the shoe to said head, said head being operable through advancing and retractive movements into and out of operative relation to the shoe, driving means for imparting a cycle of movement to said jack, said driving means comprising a member which is adjustable to vary the scope of movement of said jack, mechanism actuated in response to advancing movement of said head for imparting a setting movement to said member, said jack comprising a last holder mounted for positioning movement thereon lengthwise and heightwise of the last to position the last with respect to said head and jack, said jack also comprising a last size sensing element mounted for movement with respect to said holder into engagement with the last to limit the movement of said holder whereby the last is located in its operative position upon the jack, means operated in response to the movement of said holder lengthwise of the last for limiting the operation of said mechanism whereby a setting movement is imparted to said member in accordance with the positioning movement of said holder, control means operable at the end of a cycle of movement of said jack for initiating a retractive movement of said head, and other control means operated in response to the departure of said head from thershoe for actuating said mechanism to return said member to its original position.

9. In a machine for operating upon shoes on lasts having size indicating surfaces located thereon in positions corresponding to their sizes, a jack comprising a holder for a last and a size sensing element disposed opposite to the size indicating surface of a last on said holder, said holder and element being mounted for last positioning movement together upon said jack lengthwise of the last, said holder and said element also being mounted for movement relatively to each other heightwise of the last in response to said positioning movement to bring said element into engagement with said size indicating surface whereby the said last positioning movement of said holder is limited in accordance with the size of the last.

10. In a machine for operating upon shoes on lasts having size indicating surfaces located thereon in positions corresponding to their sizes, a jack comprising a last holder mounted for positioning movement lengthwise of the last and inclined to its bottom to permit the mid point of the shoe bottom to be centered with respect to said jack at a predetermined level, and a size sensing element mounted in said holder for movement heightwise of the last into engagement with the size indicating surface of a last on said holder in response to the positioning movement of said holder whereby the positioning movement of said holder is arrested when the last reaches a centered position upon the jack.

11. In a machine for operating upon shoes on lasts having size indicating surfaces located thereon in positions corresponding to their sizes, a jack comprising a last holder and a size sensing member disposed opposite to the size indicating surface of a last on said holder, said holder and member being mounted for last positioning movements together in different directions lengthwise of the last, and connections for causing said member to move toward the last relatively to said holder in response to its positioning movement whereby the last is located with respect to the jack in a predetermined position upon the engagement of said sensing member with the size indicating surface on the last.

12. In a machine for operating upon shoes on lasts having size indicating surfaces thereon in positions corresponding to their sizes, a jack comprising a last holder and a size sensing member mounted thereon for movement relatively thereto heightwise of a last on the holder into engagement with the size indicating surface of the last, said member and holder being mounted for movement parallel and inclined to the last bottom, respectively, and connections between said holder and member for causing said member to be moved proportionately to the movement of said holder into engagement with the size indicating surface of the last on the holder whereby its 13 movement is limited in accordance with the size of the last.

13. In a machine for operating upon shoes on lasts having size indicating surfaces located thereon in positions corresponding to their sizes, a jack comprising a last holder which is mounted for movement lengthwise of a last on the holder along a path inclined to the last bottom at a slope which conforms to the ratio of the changes in length and height of lasts of different sizes, a last size sensing member mounted in a recess in said holder extending heightwise of the last for movement relatively to said holder into engagement with the size indicating surface of the last on the holder, said member being mounted for movement upon said jack parallel to the last bottom whereby, in response to last positioning movement of said holder lengthwise of the last, said member is moved proportionately heightwise of said holder into engagement with the size indicating surface on the last.

14. In a machine for operating upon shoes on lasts having size indicating surfaces located thereon in positions corresponding to their izes, a jack comprising a holder having a jack pin upon which a last is mounted and a size sensing element disposed opposite to the size indicating surface of a last on said holder, said holder and element being mounted for last positioning movement together upon said jack lengthwise of the last, said holder and said element also being mounted for movement relatively to each other heightwise of the last in response to said positioning movement to bring said element into engagement with said size indicating surface whereby the said last positioning movement of said holder is limited in accordance with the size of the last, and a last support mounted upon said jack for movement into engagement with the forepart of the last obliquely toward said jack pin whereby the last is clamped upon said holder and said holder is held at the end of its positioning movement with said sensing element pressed against the last.

No references cited.

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