US3048863A - Machines for attaching strip material to insoles - Google Patents

Description

M. H. ROSKE Aug. 14, 1962 MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES 15 Sheet-Sheet 1 Filed July 2, 1959 in uemor Milton H. Ros/(e M. H. ROSKE Aug. 14, 1962 MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES Filed July 2, 1959 15 Sheets-Sheet 2 Aug. 14, 1962 M. H. ROSKE 3,048,863

MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES 15 Sheets-Sheet 4 Filed July 2, 1959 'lluw nn 672 292 32678 .566. 578

' -gq 770 "I' \E), 772 176 240 774 Aug. 14, 1962 M. H. ROSKE 3,048,853

MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES Filed July 2, 1959 15 Sheets-Sheet 5 M. H. ROSKE Aug. 14, 1962 MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES l5 Sheets-Sheet 6 Filed July 2, 1959 HI! II VI! lllll] IllllI I r. l lllllllllllll M. H. ROSKE 3,048,863

MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES Aug. 14, 1962 15 Sheets-Sheet 7 Filed July 2. 1959 Aug. 14, 1962 3,048,863

MACHINES FOR ATTACHING STRIP MATERIAL T0 INSOLES M. H. ROSKE 15 Sheets-Sheet 8 Filed July 2, 1959 M. H. ROSKE Aug. 14, 1962 MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES 15 Sheets-Sheet 9 Filed July 2, 1959 KRQ M. H. ROSKE Aug. 14, 1962 MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES l5 Sheets-Sheet 10 Filed July 2, 1959 M. H. ROSKE 3,048,863

MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES Aug. 14, 1962 l5 Sheets-Sheet 13 Aug. 14, 1962 M. H. ROSKE 3,048,863

MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES Filed July 2, 1959 15 Sheets-Sheet 14 Aug. 14, 1962 Filed July 2, 1959 M. H. ROSKE MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES 15 Sheets-Sheet 15 788 834 845 836 T 802 804 848 9 5 KZA United States Patent Office 3,048,863 Patented Aug. 14, 1962 3,048,863 MACHINES FOR ATTACHING STRIP MATERIAL TO INSOLES Milton H. Roslre, Boxford, Mass., assignor to United Shoe Machinery Corporation, Flemington, N.J., a corporation of New Jersey Filed July 2, 1959, Ser. No. 824,585 28 Claims. (Cl. 12-20) This invention relates to machines for attaching strip material to work pieces, and more particularly to a machine for adhesively attaching ribbed strips to insoles to prepare the insoles for use in the manufacture of welt shoes. The invention is herein illustrated as embodied in a machine of the type disclosed in United States Letters Patent No. 2,670,480, granted March 2, 1954, upon an application filed in the name of A. S. Clark, as moditied and improved in accordance with Letters Patent of the United States No. 2,979,744, granted April 18, 1961, upon an application, also filed in the name of A. S. Clark. It is to be understood, however, that in certain of its aspects the invention is not limited to machines of that type.

It is a general object of the present invention further to improve the machine of the patent and the abovenamed application in order to render it more efficient in operation and capable of producing more uniform results.

For the attainment of this general object, there is provided in the herein illustrated machine, in combination, a support for an insole, a member operated intermittently to press successive portions of a ribbed strip to the margin of the insole and to feed the insole and the attached strip at a variably predetermined rate, power operated means for imparting pressing and feeding movements to said member, means operatively connected to said member and actuated thereby in timed relation to its feeding movement to feed the strip toward engagement with the insole, means including a member over which the strip is guided in its movement toward the point of application for dispensing adhesive to coat the attaching flanges of the strip near the point of convergence between the strip and the insole, means also operatively connected to said pressing and feeding member and actuated thereby in timed relation to its feeding movement to feed adhesive from a source of supply to the dispensing means, margin control means including an edge gage against which the edge face of the insole is maintained by the operator to guide the insole during a strip attaching operation, means operatively connected to the pressing and feeding member and actuated in timed relation to the feeding movement thereof to move the edge gage on the insole support to shift the insole at certain times laterally with relation to the pressing and feeding member so as to vary the distance from the insole edge at which the strip will be attached along different portions of the insole, means for severing the strip after attachment, means actuated by the edge gage shifting means to stop the operation of the pressing and feeding member when the attaching operation reaches a predetermined point along the periphery of the insole, and means actuated by the means for stopping the operation of said member to operate the severing means.

As more particularly illustrated herein, the pressing and feeding member comprises a unitary foot having an inverted T-shaped slot for receiving the ribbed portion of the strip and portions at the opposite sides of the slot acting on the outer and inner flanges of the strip to press them against the insole and to feed the insole after each successive attaching operation. The foot is operated through a closed orbital path by a pair of eccentrics on the main shaft of the machine, of which one eccentric imparts to the foot, through appropriate connections, intermittent vertical components of movement to press the flanges of the strip, while the other eccentric, also through suitable connections, imparts to the foot intermittent horizontal components of movement to feed the work.

The strip to be attached to an insole is drawn from a source of supply and is passed through guide means forming part of a strip feeding assembly comprising a pair of rolls which engage the strip at the opposite sides of the rib portion and are rotated in opposite directions to feed the strip in engagement with a member which is located close to the presser foot and through which adhesive is extruded during an attaching cycle of the machine to coat the flange portions of the strip just in advance of the point of convergence between the strip and the insole. The strip feeding rolls are driven by a shaft which, through connections to a bar to which the presser foot is attached, is rotated intermittently as the bar is reciprocated in a horizontal plane by the previously mentioned eccentric which imparts to the presser foot its horizontal components of feeding movement.

The adhesive, in theform of a solid but flexible rod of thermoplastic cement, is fed from a source of supply by a pair of wheels drivenby a shaft which, through suitable connections to the previously mentioned presser foot bar, is rotated intermittently as the bar is reciprocated in a horizontal plane, as above noted, to impart to the presser foot horizontal components of feeding movement. The cement rod is fed into a heated casing forming a part of a melting and dispensing device in which the cement is melted to render it viscous and from which the molten cement is pumped by a gear pump, also driven by the shaft which drives the feed wheels, to supply heated liquid cement to the previously mentioned member from which it is extruded to coat the flange portions of the strip as the latter is moved over the member by the strip feeding rolls toward engagement with the insole. The flow of cement into the just mentioned member is controlled by a valve which is opened by means rendered operative by depression of an operating treadle to start an attaching operation and closed when the treadle is released. To insure an adequate supply of cement for coating the leading end of a strip to be attached to an insole, there is provided, in accordance with a feature of the invention, means actuated by initial depression of the operating trea-dle to rotate the shaft which drives the cement feeding wheels so as to start feeding cement into the melting and dispensing device before full depression of the treadle renders the eccentric which imparts feeding movement to the presser foot operative to rotate the shaft intermittently.

While the machine is inoperative the strip feeding assembly referred to above is maintained in a raised position spaced from the member over which the strip is fed by the feed rolls and which is heated to maintain the adhesive supplied to it in liquid state, in order to prevent the adhesive by which the plies of material which form the ribbed portion of the strip are bonded from being softened by contact of the strip with the heated extrusion member. In accordance with another feature of the invention, the means previously mentioned which is rendered operative by initial depression of the treadle to start the feed of cement is also effective to move the r' strip feeding assembly downward into position to bring the strip into engagement with the extrusion member, the assembly being automatically raised to its initial inoperative position at the conclusion of an attaching operation.

The edge gage in the illustrated machine is moved, as earlier stated, to shift the insole at certain times in an attaching cycle by a cam which is rotated intermittently nism shown in FIGS. 11 and 12;

by a shaft driven through connections to the eccentric on the main shaft which imparts to the presser foot its horizontal components of feeding movement. In accordance with a further feature of the invention, means is provided in the driving connection between the cam shaft and the eccentric for rotating the cam shaft at speeds variably predetermined according to dilferences in insole sizes, in order to insure that the cam will complete a revolution in the time required by the presser foot to operate around the periphery of an insole from the starting to the finishing point.

In accordance with a still further feature of the invention, the cam is provided with a member which, when the cam reaches its starting position after completing a revolution, actuates means which breaks the connection between the operating treadle and the power means which imparts feeding movement to the presser foot, thereby automatically stopping the operation of the foot, the strip feeding means, and the cement feeding means.

In accordance with yet another feature of the invention, means is provided which is rendered operative on the breaking of the connection between the operating treadle and the presser foot operating means, as previously indicated, to actuate a knife to sever the strip. At the end of its operative stroke the knife actuates means which permits the treadle to be reconnected to the pre'sser foot operating means for starting a subsequent operation of the machine.

These and other features of the invention will be more clearly understood from the following description, in conjunction with the accompanying drawings, and particularly pointed out in the claims.

In the drawings,

FIG. 1 is a front elevation of the head of an illustrative machine embodying the invention;

FIG. 2 is a side elevation of the base of the machine;

FIG. 3 is a sectional plan view, taken along the line III-III of FIG. 2, of means for adjusting the heightwise position of the work support;

FIG. 4 is a side elevation of the machine;

FIG. 5 is a perspective view of the principal operating mechanisms of the machine for feeding and attaching a strip to an insole, feeding the insole and attached strip, and guiding the insole during a strip attaching operation;

FIG. 6 is a perspective view of a heel gage mechanism for initially locating an insole on the work support with relation to a strip attaching and work feeding presser foot;

FIG. 7 is a perspective view of holddown means oper- 7 scale of mechanism shown in the lower left-hand portion of FIG. 1 for feeding a strip toward an insole and of part of a mechanism for extruding thermoplastic cement to coat the strip before it engages the insole;

FIG. 11 is a right side elevation on an enlarged scale of a portion of the strip feeding mechanism shown in 1 FIG.

FIG. 12 is a detail view in rear elevation and at a slight angle of the strip feeding mechanism shown in FIG. 11; FIG. 13 is a bottom view of the strip feeding mecha- FIG. 14 is a detail plan View of a portion of a nozzle and of means for operating a valve forming part of the I cement dispensing mechanism;

FIG. 15 is a detail view in fiont elevation of the nozzle and the valve, which is shown in the open position;

FIG. 16 is a view similar to FIG. 15, with the valve shown in closed position;

FIG. 17 is a detail View in right side elevation of a work supporting table and of the strip feeding and coating means;

FIG. 18 is a perspective rear view of driving means for the cement dispensing mechanism;

FIG. 19 is a detail plan view on an enlarged scale of an edge gage and cam mechanism for operating the gage to shift the insole laterally of the work support during a strip attaching operation;

FIG. 20 is a front elevation of the mechanism shown in FIG. 19;

FIG. 21 is a detail plan view of the mechanism shown in the left-hand portion of FIG. 20;

FIG. 22 is a detail view in left side elevation of the edge gage and associated parts;

FIG. 23 is a left side elevation of mechanism shown in the upper left-hand portion of FIG. 1 for initially determining the speed of rotation of the edge gage operating cam in accordance with insole sizes;

FIG. 24 is a plan view of the edge gage operating cam;

FIG. 25 is a diagrammatic view showing an insole in its relation to the strip feeding and attaching mechanism and the cement feeding and dispensing mechanism;

FIG. 26 is a detail of a portion of the mechanism shown in FIG. 25;

FIG. 27 is a perspective view of an insole with a ribbed strip attached thereto in the machine;

FIG. 28 is a wiring diagram; and

FIG. 29 is a schematic view showing the various electrical controls and the related mechanisms operated thereby.

Work Support The machine comprises a base or column (FIGS. 1, 2 and 4) having at its upper end a plate 52 to which is bolted a casting or head 54 which supports the various operating instrumentalities of the machine. In the casting 54 there is provided a dovetail guideway 56 in which is mounted for heightwise movement a slide 58 having afiixed thereto by a screw 60 (FIG. 1) a work support comprising a table 62 and a roll 64 rotatably mounted on a stud 66 fixed in the upper portion of the table. For lowering the table to facilitate the insertion of an insole there is pivoted on the slide 53 by a stud 68 the upper end of a link 70, the lower bifurcated end of which is pivotally connected by a pin 72 to one arm of a bell crank lever 74 fulcrumed on a stud 76 extending through a block 78 slidably mounted in the guideway 56. The other arm of the lever 74 is connected by a rod 36 to a treadle 82 fulcrumed on a shaft 83 mounted in the base of the machine. The link and the bell crank lever '74 form a toggle which, in its straightened position, holds the table elevated but is broken when the treadle 82 is depressed to lower the table. A spring 84 attached at one end to the treadle and at its other end to a screw eye 85 threaded into the machine base returns the table to its normal position when the treadle is released. An abutment 86 fastened to the machine base limits the reverse movement of the toggle 70, 74 to its straightened position.

The heightwise with relation to a eration with this roll, to feed the insole and the strip For this purpose there is secured in the block 78. At its lower end the screw 194 is provided with a knurled knob or hand wheel 108 the upper face of which, as shown in FIG. 3, has a plurality of markings or graduations 110 each of which represents an insole iron or thickness. To adjust the table at the proper height for insoles of a given thickness, the screw 104 is rotated until one of the markings on the wheel 1118 registers with a pointer 112 (FIGS. 3 and 4) slidably mounted in a bracket 114 fixed to the block 102. When the screw is rotated in one direction or the other the disk 106, acting through the block 78 on the toggle formed by the bell crank lever 74 and the link 76, raises or lowers the slide 58 and with it the table 62.

Heel Gage The insole to which a ribbed strip is to be attached is introduced into the machine between the roll 64 and the presser foot 109 with its heel end pointing rearwardly of the machine or away from the operator. The attachment of the strip usually commences at the heel breast line at one side of the insole and, after rounding the toe end, terminates at the heel breast line at the opposite side. For locating the insole in the position in which the heel breast line will be in register with the presser foot for commencing an attaching operation at the desired point, there is provided a heel gage 116 (FiGS. 4 and 6) located rearwardly of the presser foot and comprising a sleeve 118 mounted for sliding movement rearwardly or forwardly of the machine in a guideway formed in a block 120 extending transversely of the machine. The sleeve 118 surrounds a screw 122 extending through a block 124 and having collars 126, 128 fixed to it at opposite sides of the block 1 24. By turning the screw 122 in one direction or the other the sleeve 118 may be moved forwardly or rearwardly to adjust the heel gage 116 in the desired position to locate the insole to be operated upon relatively to the presser foot 100 in the position to determine the starting point of the strip attaching operation. To the block 120 is secured an upwardly extending arm or slide 130, in the shape of an inverted L and slidable in a guideway formed in a bracket 132 secured to the machine head. The under surface of the horizontal arm of the slide 130 is cam shaped and is engaged by a roll 134- mounted on a screw 136 threaded into one end of a horizontal rod 138, the other end of which is fastened in a block 141) secured to a lever 142 pivoted at 144 (FIG. 8) on the machine head 54. To the lever 142 is connected the upper section 146 of a two-part rod, the lower section 147 of which is connected to a treadle 148 (FIG. 2) pivoted on the shaft 83. Depression of the treadle 148 causes the lever 142 to turn in a clockwise direction to render operative power operated means, to be described later, to start operation of the presser foot 100. By this movement of the lever 142 the rod 138 (FIG. 6) is moved in the same direction, whereby the action of the roll 134 on the cam surface of the horizontal arm of the slide 131) causes the slide to move upwardly to lift the heel gage 116 out of engagement with the insole at the beginning of an attaching operation.

Strip Feeding Means The strip S which is to be attached to an insole is drawn from a reel 15%) (FIG. 25) supported on a bracket 152 secured to the machine head and is guided first around a pulley 154 (FIG. 4) mounted on a bracket 155 bolted to the head, then over a wedge-shaped plow or spreader 156 (FIGS. and which engages between the strip flanges and causes them to be spread outwardly or substantially at right angles to the rib portion. The spreader 156 is formed on a horizontal arm 158 of a bracket 160 secured by screws 162 to a casting or block 164 which carries strip feeding devices to be described, and therefore sometimes referred to hereinafter as the strip feeding assembly. For a purpose to be explained hereinafter, the casting 164 is mounted for movement heightwise of the machine on a bracket 166 secured by a screw 167 to the bracket and having a T-shaped rib 168 (FIG. 14) engaging in a similarly shaped groove formed in the lefthand edge face of the casting. After the spreader 156 has spread apart the flanges of the strip, the strip is passed through a rib receiving slot 169 formed in a first or outer guide member 170 (FIG. 15) secured to the bracket 160, and then along a downwardly and rearwardly (or inwardly) inclined surface of a heated block 172 which, as will appear hereinafter, also serves as a nozzle through which adhesive is extruded to coat the flanges of the strip just prior to operation of the presser foot on the successive portions of the strip to bond them to the insole. The strip is fed along the surface of the block 172 and through a vertical slot 173 (FIG. 12) provided in a second or inner guide member 174 formed integral with the block or casting 164, by a pair of toothed rolls 176, 178 (FIGS. 10, ll, 12 and 13) engaging the opposite sides of the rib portion of the strip. The rolls 176, 178 are mounted, respectively, on pins or shafts 181 132. The shaft 181 which carries the feed roll 176 is rotatably mounted in spaced horizontal arms 184 of a lever 136 pivoted on a pin 188 set in the casting 164. A screw 190 threaded through the lever 186 and into the casting 164 is surrounded by a spring 192 by which the roll 176 is biased toward the roll 178 and against the resistance of which the lever may be swung counterclockwise (as seen in FIG. 10) about the pin 188 to separate the roll 176 from the roll 178 to permit passing the rib portion of the strip between them when the leading end of the strip is initially threaded into the machine. The shaft 182 is rotatably mounted in the casting 164 and carries on its upper end a gear wheel 194 meshing with a similar gear wheel 1% fast on the upper end of the shaft 180. The gear wheel 194 also meshes with a gear wheel 198 fast on a shaft 200 connected through a universal coupling 201 to the lower end of a vertical shaft 262 (FIGS. 1, 5 and 10) the upper end of which is connected through a universal coupling 203 to a shaft 204 (FIG. 23) journaled in a bearing sleeve 2115 joined by a web 206 (FIG. 1) to a bearing sleeve 268 formed integral with a bracket 210 fixed by bolts 212 to the machine head. Within the sleeve 208 is journaled one end of a horizontal shaft 214 the other end of which is journaled in a bracket 216 fixed to the machine head.

The feed rolls 176, 178 are rotated by the shaft 202 to feed the ribbed strip through mechanism comprising a bevel gear 218 pinned to the upper end of the shaft 204 and meshing with a bevel gear 220 pinned to the shaft 214. To the shaft 214 is keyed a one-way roller clutch 222, 224-. The upper end portion of the clutch member 224 is provided with a slot which is engaged by a pin 226 projecting laterallyfrom the bracket 216. A second one-way roller clutch 228, 231 is keyed to the shaft 214 adjacent to the gear 220, the member 230 of this clutch being pivotally connected by a pin 232 (FIG. 5) to a crank 234 formed integral with a short shaft 236. Under H the action of means, shortly to be described, by which the presser foot 160 is operated to attach the strip and feed the work by intermittent steps of variably predetermined length, the crank 234 on the shaft 236 reciprocates the clutch member 230 to rotate the shaft 214 in one direction and, through the above-described driving connections, to rotate the feed rolls 176, 178 so as to advance the strip toward engagement with the insole in timed relation to the intermittent feed of the insole by the presser foot. During the reverse movement of the crank 234, the clutch 222, 224 acts as a brake to hold the shaft 214 against reverse rotation.

Strip Attaching and Work Feeding Means The means for actuating the presser foot 100 to impart to it intermittent strip attaching and work feeding movements will now be described. Referring to FIGS. 4 and 5, the shaft 236 has secured to it the forward end of a link 238, the rear end of which is pivotally connected by a pin 239 to the upper end of a vertical bar 241 to the lower end of which is attached the presser foot 100. To the bar 24-0 is pivotally connected by a short shaft or pin 242 the forward or outer end of an arm 244 fulciumed at its rear or inner end on a pin 246 fastened in a boss 247 formed on the machine head or casting 54-. On the pin 246 is also fulcrumed the inner or rear end of an arm or lever 248. Between the arms 244 and 248 is interposed a compression spring 250 seated in alined openings in the arms and surrounding a screw 252 having threaded on its upper end lock nuts 254 by which the tension of the spring may be inntially adjusted. The forward or outer end of the arm 248 is pivotally connected by a pin 256 to the lower end of a vertical rod 258, which is pivotally connected at its upper end by a pin or shaft 268 to a horizontally extending strap 262 surrounding an eccentric 264 fast on the main drice shaft 266 which is rotatably supported in bearings in the machine head (FIG. 1). The shaft 266 is provided with a fly wheel 268 and is rotated continuously by a pulley 270 connected by a belt 272 (FIG. 2) to the shaft 274 of an electric motor 276 supported on a bracket 278 fixed to the base 50 of the machine.

Through mechanism more fully described in Patent No.

2,670,480, previously referred to, the eccentric 264 imparts reciprocating vertical movement to the rod 258 which, through the above described connections between this rod and the bar 240, including the arms 248, 244 and the spring 250, reciprocates the bar 240 and the presser foot 108 which is secured to it to press successive portions of the flanges of the ribbed strip against the margin of the insole. The mechanism by which the eccentric 264 thus operates the rod 258 and the bar 248 to reciprocate the presser foot vertically comprises a pair of inverted U-shaped yokes or links 280, 282 (FIGS. 1, 4 and 5). The arms of the inner yoke 280 are secured at their lower ends to the shaft 260, the yoke being mountted at its upper or bridged end for swinging movement relative to the outer yoke 282 on a shaft 284 fastened to the arms of this yoke. The opposite arms of the outer yoke 282 are secured respectively to shaft 286, 288 journaled in the machine head 54. The shaft 288 extends beyond the head 54 and has secured to its outer end a lever 290 (FIGS. 8) carrying at its lower end a roll 282 which is held in engagement with a cam surface 294 on the lever 142 by a spring 296 attached at one end to the lever 290 and at its other end to a pin 298 in the machine head. The yokes or links 280, 282 and the rod 258 form between them what, for conveniece, may be termed a toggle arrangement of which the shaft 284 is the movable pivot. While the links and the rod are in vertical alinement with one another, the action of the eccentric 264, which is rotated continuously by the shaft 266, is without effect on the presser foot, which will be merely oscillated without exerting any pressure on the work. However, when the starting treadle 148 is depressed to operate the machine, downward movement of the treadle rod 146 swings the lever 142 in a clockwise direction, as seen in FIG. 8, about its fulcrum 144 and the lever 298 is swung in a counterclockwise direction, against the tension of the spring 296, thereby turning the shaft 288 in the same direction. The yokes 280, 282 are thereby swung out of alinement with the rod 258, that is, to a position in which the toggle formed by the yokes and the rod 258 is broken and the shaft 284 is moved closer to the shaft 242 connecting the presser foot bar 240 to the arm 248, so that rotation of the eccentric 264 will alternately make and break the toggle and operate the rod 258 to impart reciprocating vertical movements to the bar 240 to cause the presser foot 180 to press the strip against the insole. Upon continued depression of the treadle 148, the roll 292 carried by the lever 290 engages a second cam surface 300 on the lever 142, which surface is concentric with the center of the fulcrum 144 about which the lever 142 turns, thereby maintaining the toggle in the broken position until the treadle is released.

As more fully explained in the previously cited Patent No. 2,670,480, the presser foot 100 is moved in a counterclockwise direction through a substantially elliptical path normal to the plane of the insole, with combined vertical and horizontal components of movement to press the strip and feed the insole and the attached strip. The mechanism by which the presser foot bar 240 is operated to impart to the presser foot its horizontal component of feeding movement is substantially similar to that above described for reciprocating the bar vertically to impart pressing movement to the presser foot. Referring more particularly to FIGS. 4 and 8, a second eccentric 302 on the main shaft 266 is surrounded by a downwardly extending strap 384, which is pivotally connected at its lower end by a shaft 306 to the rear end of a horizontal rod 308, the forward end of which is pivotally connected by a stud or shaft 310 to the up er end portion of the presser foot bar 240. On the outer end of the shaft 386, which extends beyond the strap 304 and the rod 308, is secured a U-shaped yoke or link 312 similar to the inner yoke 28% referred to above. The yoke 312 is surrounded by an outer U-shaped yoke or link 314 in the arms of which is mounted a shaft 316 about which the inner yoke 312 pivots in the same manner in which the inner yoke 280 pivots-about the shaft 284 mounted in the outer yoke 282 previously described. One arm of the outer yoke 314 is secured to a horizontal shaft 318 (FIG. 8) journaled in the machine head and extending beyond it. The opposite arm of the same yoke is secured to a similar shaft, not shown, also journaled in the machine head. On the outer end of the shaft 318 is secured a lever 320 normally held in a horizontal position against a stop 322 by a spring 324 attached at one end to the lever and at its opposite end to a pin 326 in the machine head.

The lever 320 carries a roll 328 which, when the lever 142 is turned in a clockwise direction by downward movement of the treadle rod 146, engages a cam surface 330 on the lever 142, which causes the lever 320 to swing clockwise, as seen in FIG. 8, and rotates the shaft 318 in the same direction, whereby the yokes 312, 3-14 are moved out of alinement with the rod 308, thus breaking the toggle formed by this rod with the yokes. Thereafter rotation of the eccentric 302 will make and break the toggle and reciprocate the rod 308 in -'a horizontal plane to impart horizontal movement to the bar 240 to cause the presser foot 188 attached thereto to feed the insole and attached strip intermittently with feed strokes of varying lengths as determined by the angular displacement of the yokes relatively to the rod 308 by depression of the treadle. As in the machine of the previously cited Patent No. 2,670,480, provision is made in the present machine for initially determining the limit of angular movement of the yokes 312, 314 so as to determine the maximum length of the feeding component of movement of the presser foot, thereby to determine the maximum rate of feed of the work. For this purpose there is secured to the feed control lever 142 an abutment member 331 (FIG. 8) having a projecting portion which, as the lever is swung clockwise, is arranged to engage an adjustable stop screw 33 2 extending downwardly through a bracket 333 secured to the top of the machine head. By adjusting the screw 332 the limit of clockwise movement of the lever 142, and hence that of the lever 320 by which the means just described is actuated to impart feeding movements to the presser foot, may be variably determined to vary the maximum rate of work feed.

As the presser foot bar 240 is reciprocated in the manner above described, the link 238 (FIG. 5) connect ing the bar to the crank 234 on the shaft 236 reciprocates the clutch member 230, against the tension of a spring 334 attached at one end to the pin 232 securing the clutch member to the crank 234 and, at its other end, to a bracket 335 secured to the top of the bracket 216 (see FIG. 4). Reciprocation of the clutch member 230 rotates the horizontal shaft 214 intermittently in a direction to rotate, through the gears 220, 218, the vertical shaft 282 to which the gear wheel 198 (FIG. 10) is se- 9 cured, thereby to rotate the feed rolls 176, 178 to feed the strip in timed relation to the feed of the insole by the presser foot 100. As explained earlier, during reverse rotation of the clutch 228, 230 the clutch 222, 224 acts as a brake to prevent reverse rotation of the shaft 214 and thus prevents b ack feeding of the strip.

Cement Dispensing and Strip Coating Mechanism The strip S to be attached to insoles in the present machine is preferably of the type disclosed in United States Letters Patent No. 2,774,699, granted December 18, 1956, upon an application filed in the name of Alfred S. Clark. This strip, as illustrated in FIGS. 26 and 27, is composed of two plies of material bonded together throughout portions of their respective widths to form an upstanding rib portion R and laterally extending attaching flanges F1 and F2 which, for use in the machine of the present invention, are left uncoated in the prefabricated ribbed strip, the flanges being, as indicated earlier, coated with adhesive by the extrusion member 172 as the strip is moved along the inclined surface of this member toward engagement with the insole and just before it is acted upon by the presser foot to attach it to the insole.

The adhesive employed in the present machine to coat the strip flanges is in the form of an elongated solid, but flexible, rod C of thermoplastic cement of the type disclosed, for example, in United States Letters Patent No. 2,874,084, granted February 17, 1959, upon an application filed in the name of Hans C. Paulsen. As illustrated diagrammatically in FIG. 25, the rod of cement C is drawn from a reel 336 supported on a bracket 338 fixed to the machine head. The cement rod is moved into a block 340 (see FIG. 4) having a guide tube 342 (FIG. 25) for receiving the rod, the tube being cut away at its opposite sides to permit the rod to be engaged by a pair of feed wheels 344, 346 by which the cement rod is caused to move through an inlet tube 348 into a casing 350 forming part of a melting and dispensing device substantially of the type disclosed in United States Letters Patent No. 2,765,768, granted October 9, 1956, also upon an application of Hans C. Paulsen. Within the casing 350, which is heated by electrical units 352, there is mounted on a shaft 354 a disk 356 provided around its periphery with a pasageway 358 from which the molten cement is discharged into a chamber 368 from which it is supplied by a pump formed by a pair of gears 362, 364 to an inclined passageway 366 formed in a nozzle housing or carrier 368 (see also FIGS. 1, 4 and secured to the casing 350 and heated by electrical units 370 to maintain the cement in molten condition. The inclined passageway 366 is arranged to communicate with an orifice 372 in a valve 374 housed in the nozzle carrier 368 and having a stem 376 on which is fastened a pinion 378 meshing with a rack bar 380 slidable in a T-shaped slot formed in a block 382 secured to the casing 358. The rack bar 380 is connected by a spring 383 to a link 384 (FIGS. 4 and 18) which is in turn connected by a bell crank lever 386 and a link 387 to the armature 388 of a solenoid 398 supported on a bracket 391 secured to the machine head 54. The solenoid 390 is energized by a normally closed microswitch 392 which is held open by engagement with a roll 394, carried by the switch arm, of a finger 396 pinned on the shaft 286 on which is secured one arm of the yoke 282 and which extends beyond the bracket 216. A spring 398 is secured at one end to a pin 399 on the link 384 and at its other end to a lug 400 depending from the machine head. When, upon depression of the treadle 148 to start an attaching operation, the yoke 282 is swung forwardly of the machine, or clockwise with reference to FIG. 4, and the shaft 286 is rotated in the same direction, the finger 396 is disengaged from the roll 394, whereby the switch 392 is closed to energize the solenoid 3%. The rack bar 380 and the link 384 are thereby moved as a unit rearwardly, or to the left of FIG. 4, expanding the spring 398. By this movement of the rack bar the pinion 378 (FIG. 10) is rotated and rotates the valve 374 to the position in which its orifice 372 is placed in communication with the passageway 366. Heated melted cement is then permitted to flow from this pasageway through the orifice 372 into a vertical passage 401 (FIGS. 10 and 16) in the valve and thence through a lateral passage 402 provided in the block or nozzle 172, which passage communicates with a plurality of capillary grooves 403 formed in the block and through which cement is extruded in the form of a plurality of ribbons or threads onto the flanges of the strip as the strip is fed toward the insole. The cement cools and sets almost instantaneously upon contact of the strip flanges with the insole, so that the attaching operation continues without interruption. When the solenoid 390 is deenergized by the opening of the microswitch 392 upon release of the operating treadle 148, the spring 398 returns the rack bar to its initial forward position and, by rotating the pinion 378 in reverse direction, rotates the valve 374 to the position in which its orifice 372 is out of communication with the inclined passageway 366 in the nozzle carrier 368, thereby interrupting the supply of cement to the extrusion nozzle 172. If the operating treadle should be depressed to operate the machine before the solid rod cement has been sufficiently heated to render it flowable, the link 384 connecting the rack bar 386 to the armature of the solenoid 390 will be moved rearwardly, or to the left of FIG. 4, without moving the rack bar, by reason of the yielding connection provided by the spring 383, thereby preventing damage to the parts.

The solid rod cement is fed into the casing 350 of the melting device by mechanism which is operatively connected to the power means described above for operating the presser and feed foot 100, and which is driven in timed relation to the feeding movement of the foot. Referring to FIGS. 4 and 5, a cross link 404 is pivotally connected at its forward end by the shaft 310 to the presser foot bar 240 which, as already explained, is oscillated by the eccentric 382 about the shaft 242 to impart intermittent feeding movements .to the foot 100. The rear end of the link 404 is adjustably connected to an arm or lever 486 (see also FIG. 18) by means of a stud 408 engaging in a slot 410 provided in the lever 486. By adjustment of the link 404 into different positions relatively to the lever 486, the rod cement feed increments may be lengthened or shortened to vary the amount of cement extruded through the nozzle 172 in accordance with the individual preferences of operators or with differences in the characteristics of work pieces to be bonded in the machine.

The lever 406 is fulcrumed at its lower end on a pin 412 (FIG. 18) in a bracket 414 secured to the machine head, and has an upwardly extending arm 416 connected to an arm 418 by a pin 420 engaging in a slot 422 in the arm 418. The arm 418 is pinned to a shaft 424 rotatably mounted in a bracket 426 fixed to the machine head. Also pinned to the shaft 424 is a rocker 428 having a forwardly extending arm 430 and a rearwardly extending arm 432. The arms 430, 432 are connected respectively by adjustable links or rods 434, 436 to a pair of Horton-type clutches 438, 440 pinned to a horizontal shaft 442 and rotated in opposite directions through a half revolution to rotate the shaft stepwise. The shaft 442 is journaled in bearing blocks 444, 445 extending rearwardly from the machine casting or head 54, and carries near its outer end a sprocket wheel 446 which is coupled to the shaft to turn therewith through a clutch 447 that is urged into frictional engagement with the sprocket wheel with adjustably variable pressure by means of a spring 448 surrounding the shaft between a collar 449 and a knurled wheel 450 threaded on the outer end of the shaft. The sprocket wheel 4 46 is engaged by a chain 451 which also meshes with a sprocket wheel 452 keyed to a shaft 453, to which is also fastened the upper feed wheel 344 which cooperates with the lower feed wheel 346 to feed the rod cement C into the casing 350 of the melting device. The sprocket wheel 452 is frictionally coupled to the shaft 453 to turn with it by a clutch 454 which is urged toward the sprocket

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