US2879921A - Cement handling mechanism - Google Patents

Description

March 31 1959 w. E. NAUGLER 2,879,921

CEMENT HANDLING MECHANISM Original Fil'ed Oct. 21. 1952 3 Sheets-Sheet l Inventor Walter Eli bugle,

March 31, 1959 W. E. NAUGLER CEMENT HANDLING MECHANISM Original Filed Oct. 21, 1952 5 Sheets-Sheet 2 Inventor Waite/"E Naugler' B his Attome March 31, 1959 w. E. NAUGLER 2,879,921

CEMENT HANDLING MEUHANISM Original Filed Oct. 21, 1952 3 Sheets-Sheet 3 E 346 35g 332 Q) L r nip Ll fiii I 3 35 l t" $733.

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a 344 I 1 [mum m E E 314 1 35; 312 352 1 g Inventor T/Va Zter' E Naugler' I "334: By his Attorney United States Patent CEMENT HANDLING MECHANISM Walter E. Naugler, Beverly, Mass., assignor to United Shoe Machinery Corporation, Flemington, N.J., a corporation of New Jersey Original application October 21, 1952, Serial No. 315,895, now Patent No. 2,720,667, dated October 18, 1955. Doi l'iggd and this application May 11, 1955, Serial No. 5 0

4 Claims. (Cl. 222-431) This invention relates to cement handling mechanisms for heat softenable adhesives which are applied to the work while hot. It is herein illustrated as embodied in a machine for folding edges of work such as shoe uppers and of the type in which cement is. applied to the work immediately prior to the operation of the folding instrumentalities, and this application is a division of an application Serial No. 315,895, filed October 21, 1952, in my name, now Patent No. 2,720,667, dated October 18, 1955.

Although it was realized for many years that the cementing operation as a separate step could be eliminated if folding machines were provided with means for applying the cement just prior to the folding operation, it has also been understood that the usual cements such as those of the rubber or pyroxylin type would not set quickly enough to hold the fold after the work had left the machine. Later it was found that cements of the thermoactive type provided one possible solution and there was developed a machine for handling such cements which is illustrated in Letters Patent of the United States No. 2,301,202, granted November 10, 1942, upon the application of Paul H. Dixon, that machine being intended for use with edges to be covered with French binding.

While such machines have been in successful use for a number of years, the desire has persisted for a machine which would handle an even more viscous type of thermoplastic resinous adhesive. Such cements, however, have proven difficult to handle because of their viscosity and the consequent requirement of higher temperatures and greater pressure. The need for such cements is found particularly in the folding of skived leather edges and the need is greatest where the leather of the upper material is stiff and has a marked tendency to return to its unfolded condition unless the cement sets very quickly and has a good bonding power. These leathers are typified by those known to the trade as Cordovan and as Scotch Grain.

An additional difficulty has arisen in machines designed to handle the more viscous thermoplastic resinous materials because of the high temperatures required to heat the supply of material in a receptacle and the consequent tendency for such cements to coo or burn on the receptacle in cases where the cement has been kept at a high temperature hour after hour and perhaps day after day.

Accordingly, an object of the invention is to provide an improved cement melting and supplying mechanism capable of utilizing materials requiring high temperatures and considerable pressures.

An important feature of the invention resides in the utilization of a heated receptacle of inverted frustoconical shape which is provided at its lower, hence smaller, end with a positive feed mechanism herein illustrated as a gear pump. By mounting this receptacle close to the nozzle which delivers the-cement to the work,-

Patented Mar. 31, 1959 many of the above-mentioned difliculties have been avoided.

Another feature of the invention resides in the provision of a power operated scraper mechanism which fits the inner surface of the receptacle where the temperature is highest and which continually removes the layer of cement which is in contact with the wall of the receptacle and pushes it toward the outlet opening. This removal of the hottest cement permits a circulation of the cooler cement out toward the heated wall of the receptacle. As illustrated, the scraper mechanism comprises blades fitting closely against the inner surface of the receptacle, which blades have a forward edge inclined with respect to a vertical plane through the axis of rotation in a direction to cause the scraper to push the melted cement downwardly toward the feed mechanism.

These and other features of the invention will best be understood from a consideration of the following specification taken in connection with the accompanying drawings, in which Fig. 1 is a view of the work-engaging parts of a folding machine, taken from the rear side, and showing a cement pot from which its scraper has been omitted;

Fig. 2 is a detail view of the creaser-foot of this machine with its internal passages;

Fig. 3 is a plan view of the cement-feed mechanism shown in Fig. 1 and also omitting the scraper for the sake of clarity;

Fig. 4 is a fragmentary view of a portion of the support for the creaser-foot carrier shown in connection with a finger lever for lifting the same;

Fig. 5 is a fragmentary view looking down on the cement pot and showing the drive for the associated scraper; I

Fig. 6 is an angular view of the scraper removed from the pot; and

Fig. 7 is a vertical section through the cement pot on the line VIIVII of Fig. 5, but leaving the whole of the scraper therein.

The frame of the machine comprises a hollow base (not shown) having a laterally extending arm 14 (Fig. 1). The arm 14 includes a removable end portion 16 on which is secured a work-supporting plate 18. Removably secured to the upper portion of the base is a cap having a neck 20 (Fig. 3) which overhangs the arm 14 and terminates in a web 530 to which is attached a removable head 22. The basic structure of the machine is similar to that shown in Letters Patent of the United States No. 2,270,891, granted January 27, 1942, upon the application of C. A. Newhall.

Supported on the outer end of the arm 14 is a gage block 24 (Fig. 1) having an upturned surface for deflecting upwardly the margin of the work to be folded. The extent to which the margin of the work is deflected upwardly is determined by a gage finger 28 which is mounted on the lower portion of the head 22 in a manner to be described. Since this gage finger determines the extent to which the margin of the work is deflected upwardly, it also determines the width of the fold which is to be formed therein. A folding finger 30 (Fig. 1) is mounted for oscillation in the arm 14 in a path forming an acute angle with the upper surface of the arm 14 and folds the margin of the work, which has been deflected upwardly by the gage block 24, against the adjacent surface of a creaser-foot 32. During the upward movement of the folding finger 30, the work is held against movement on the work support 18 by means of a gripper member 34 which moves from a position within the upper surface of the arm 14 to a position above this surface in which it grips the work against the under surface of the creaser-foot 32.

Located beyond the folding finger in the direction of feed of the work is a hammer 36 (Fig. 1) which cooperates with an anvil 38 to press the fold formed by the folding finger 30. After the fold has been pressed between the hammer and anvil, the gripper member 34 moves downwardly to release its hold on the work and the hammer and anvil then move as a unit toward the observer in Fig. 1 to feed the work past the gage block 24. The Work is accordingly folded and fed in a step-by-step manner generally as described in the aforementioned Newhall patent.

A snipper knife 40 (Fig. 1) is mounted on the head 22 and is arranged to be moved downwardly under the control of the operator for snipping the margin of the work when a sharp incurved portion thereof is being folded.

A main drive shaft 42 (Fig. 1) is journaled in the base and the arm 14 of the machine and may be connected by a belt to any suitable driving means. The work gripper member 34 is mounted on the outer end of a rockshaft 48 journaled in the arm 14 and extending parallel to the main drive shaft 42.

The folding finger 30 is mounted on the inner end of an arm 64, the outer end of the arm being mounted for oscillation on a stud 66 (Fig. 1). Oscillatory movement to move the folding finger is imparted to the arm 64 by a crank pin 68 on the end of the drive shaft 42 which is received by a slotted pin 70 carried by an intermediate portion of the arm 64 so that upon rotation of the drive shaft 42 the pin 68 imparts oscillatory movement to the arm 64 carrying the folding finger.

Provision is made for adjusting the path of movement of the folding finger in order to vary the space between it and the adjacent surface of the creaser-foot by adjusting the position of the stud 66 on which the arm 64 is mounted. The stud is mounted in a bore eccentrically located in a bushing 65 journaled in the end portion 16.

The anvil 38 is supported by means of a hollow shaft 80 journaled in the arm 14 and arranged to be oscillated about its axis by mechanism to be described. The anvil 38 is mounted on the outer end of an arm 82 which extends rearwardly and downwardly, as indicated in Fig. 1, the lower end thereof terminating in a split clamp 84 secured to the shaft 80 by means of a screw 86.

The hammer 36 which cooperates with the anvil 38 to press the folded margin of the work and to feed the work is formed at the upper end of an arm 94 which is pivoted between its ends on a pin 90 mounted in the arm 82, the outer end of which carries the anvil 38. Oscillatory movement is imparted to the hammer 36 to move the hammer toward and away from the anvil by a reciprocating rod 102. As the shaft 80 is oscillated, it will cause oscillation of the anvil 38 and, by reason of the mounting of the hammer, a similar motion will be imparted thereto so that the hammer and anvil are moved together along the line of feed. During this movement of the hammer and anvil, the hammer is adjacent to the anvil with a portion of the fold in the margin of the work pressed and held therebetween.

Having described the work-contacting tools which are supported in the lower arm 14 of the frame, it is in order to describe those coacting tools which are supported in the removable head 22 attached to the neck 20 of the frame. This removable head 22, the attaching portion of which is shown in Fig. 3, comprises a casting which has a side plate 200 erected on the side away from the observer in Figs. 1 and 3 and from the lower edge of this side plate the casting is extended toward the observer to provide an underlying portion 202 which includes a transverse web 204 (Fig. 3) and which extends upwardly again (as seen in Fig. l) terminatingin a triangular plate 206.

Integral with the web 204 is a depending member 208 (Fig. l) passing through which is a pivot rod 212. On this pivot rod 212 is mounted the gage finger 28.

Inasmuch as it may be desired to adjust the position of the creaser-foot 32 to vary. the work-margin receiving space between it and the adjacent surface of the folding finger 30, said foot is attached by screws 234, 236 (Fig. 2) to the lower end of a cement tube 240 having a passage 241 (Fig. 1) connecting a receptacle 314 (to be described) to a passage 300 (Fig. 2) in the creaser-foot 32 which enables the latter to act also as a nozzle. This cement tube 240 is movably supported, as later described, on a carrier plate 242 (Figs. 1 and 4) overlying the web 204 of the head casting 22. The carrier plate is supported in the head 22 by means of screws 244, 246, 248 (Fig. 3) which are received in grooves in the side edges of this carrier plate.

At its front end the carrier plate 242 has an extension 260 (Fig. 4) to furnish a mounting for a pivot 261 at one end of a supporting link 262 which has a pivot screw 265 joining it to a hump 267 on the tube 240. At its other end the carrier plate has spaced lugs 264, 266 (Fig. 3) to provide a tiltable mounting for the upper portion of the cement tube 240.

Specifically, this mounting comprises a U-shaped yoke 270 (Fig. 3) pivoted upon a shaft 272 passing through the lugs 264, 266. This yoke has forwardly extending arms 274 to receive a pivot pin 276 passing through a hump 278 (Fig. 1) on the lower side of the cement tube. Upward movement of the creaser-foot and the cement tube about the shaft 272 and the link pivot 261 may be effected by the depression of a finger piece 280 (Figs. 1 and 4) attached to the outer end of a cross rod 282 on which an arm 284 (Fig. 4) is secured. This arm has at its outer end a roller 286 positioned to underlie the link 262. The lifting action is effected against the action of a spring 288 surrounding a rod 290, a lower end of which is pivotally attached to the link 262 at 292. The rod passes through a plate 294 having a pivot extension 296 which rocks in an upstaning arm 298 forming part of the carrier plate 242. Threaded in the plate 294 is a bushing 297 to adjust the tension of the spring 288 and on the rod is a lock nut 299.

It will be noted that the connecting passages 300 in the creaser-foot 32 (shown in Fig. 2) join the passage 241 in the cement tube 240 to the bottom surface 302 of the creaser-foot. The latter is provided with a lateral hollow extension 304 for the reception of a heating unit designed to maintain the temperature of the creaser-foot at a desired value. The receptacle 314, the creaser-foot nozzle 32, and a force feeding mechanism comprising gears 324 provide a cement extruding mechanism.

Furthermore, within the passage 241 in the tube 240 there is a heating unit 306 (Fig. 1) supported at its upper end in a bushing 308 threaded in the tube 240. The upper end of this unit is provided with terminals 310 supported on a bracket 311 and to which electric conductors may be attached and led to any suitable control device whereby the temperature of the passage surrounding this heating unit 306 may be maintained at its desired value.

Adhesive material is supplied to the passage 241 in the tube 240 from a cup 312 which is made integral with the tube. Received within the cup (Figs. 1 and 7) is a receptacle 314 shaped like an inverted frustum of a cone and held in place therein by an overhanging rim 316 and provided on its outer surface with a substantially helical groove 318 designed to receive a heating unit 320. The latter unit is provided with terminals 322 adapted to be connected by electric conductors to a controlled source of electrical heating energy.

At the bottom of this receptacle 314 is a chamber containing a force-feeding mechanism in the form of a gear pump comprising gears 324 (Figs. 1, 5 and 7) mounted on laterally extending shafts 325, 327. The shaft 325 is provided with a driving pinion 326 and a worm 328. It will be seen from Fig. 1 that the gear pump feeds into an outlet passage 330 which opens directly into the passage 241 of the tube. The pinion 326 which is attached to the pump gear 324 meshes with an idler 332 to which power is transmitted byta gear-.334 carried by the, shaft 272 about which the yoke 270 swingsandon this shaft between the arms of the yoke is askewgear 336 (Fig. 3) meshing in turn with another gear 338 on a shaft 340-extending lengthwise of theframe arm 20 and to which power may be delivered intermittently.

Difiiculties which have been previously encountered when employing thermoplastic cements, because of overheating or cooking of the cements if they are kept for a long time at an elevated temperature, have been overcome by the utilization within the cup 314 of a rotatable scraper 342 (Fig. 6) supporting a cover 343. This comprises an upper rim 344 on which there is mounted an annular gear 346 meshing with a gear 348 (Figs. 5 and 7) which is carried at the upper end of a shaft 349 journaled in a bracket 350 attached to the receptacle 312. At the lower end of this shaft 349 is a worm gear 352 meshing with the previously mentioned worm 328 attached to the drive shaft 325 of the gear pump. Whenever the gear pump is driven, therefore, the scraper is rotated and it is provided with a pair of depending blades 354 each of which extends downwardly from the upper rim 344 of the scraper to slide on the inner wall of the cup 314. The active edges 356 of these scraper blades are undercut and extend rearwardly and downwardly, considering the direction of rotation of the scraper, as indicated by the arrows in Fig. 5.

Consequently, these active edges serve also to push the melted cement, which lies immediately adjacent to the inner face of the cup 314, downwardly toward the gear pump chamber and at the same time allow the cooler cement in the inner portion of the cup.to flow out into contact with the heated wall of the cup to take the place of the material which has been pushed downwardly. Another important advantage of this arrangement is that, in starting the machine into operation after it has been allowed to cool, it is only necessary to melt a thin layer of cement immediately adjacent to the inner surface of the cup 314 after which the succeeding portions of the lump of material contained in said cup will soften, the lump will drop down, and melted portions will move out into contact with the heated wall of the cup.

After the whole of the material in the cup has become melted, it will be seen that the scraper 342 serves also as an agitator continuously to bring coolerportions to the inner cup surface. For the above reasons there is no danger of harming the cement by repeated overheating or cooking and the fully melted cement will be immediately and continually furnished to the gear pump for removal thereby and extrusion through the passage 241 of the cement tube.

The arrangement is such, as described in the parent case, that a connection between the drive shaft 42 and the shaft 340 may be completed by a latch (not shown) which is closed, at the will of the operator. This connection (not shown) includes a one way clutch and an oscillatory drive member whereby the gear 338 is given repeated pushes to turn it intermittently in clockwise (Fig. 1) direction. The shaft 340 adjacent to the gear 338 is journaled in the web 530 at the end of the neck 20.

When the machine is to be operated, assuming that cement has been supplied to the frusto-conical receptacle, the operator will turn on the electrical heat for the unit 320 (Fig. l) in the receptacle and for the unit 306 in the tube leading to the nozzle and for the unit 304 on the side of the creaser-foot. As soon as this heat melts any residue in the nozzle and a layer of cement adjacent to the wall of the receptacle, a switch, such ,as a knee-operated switch (not shown), may be closed to energize a solenoid (not shown), thereby to complete the drive for the pump by releasing the above-mentioned latch.

A piece of work, having a skived edge, may be inserted in the machine in the usual fashion by depressing the finger piece 280 so as to lift the creaser-foot and another finger piece (not shown) to lift the gage finger 28, whereupon the work may be moved against the gage block 24 and the finger pieces released. Having then started the drive leading to the main shaft 42 of the machine to fold and feed the work, cement will be supplied continuously through the creaser-foot just prior to the folding of the margin of the work. The cement cools so quickly that, as soon as the folded margin is pressed against the margin of the work by the hammer 36, enough heat will be removed by the contacting metal parts to allow the cement to cool and to hold the fold in the work.

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

1. In a machine of the character described in which cement is delivered continually to a nozzle, a force-feeding mechanism, a cup-shapedmember above said mechanism, an inverted frusto-conical receptacle inside said cupshaped member provided with a peripheral groove to receive a heating unit, a rim on the cup-shaped member holding said receptacle tight against the bottom of the cup, a bladed scraper substantially fitting the inner surface of the receptacle, said scraper having an annular gear above the cup, and means for driving said gear and said force-feeding mechanism. I

2. A cement extruding mechanism comprising an open topped receptacle for receiving cement in solid form, an

outlet in the lower portion of the receptacle, means for heating the receptacle from the exterior to melt the cement in contact with the walls thereof, a blade extending downwardly from the upper edge of the receptacle and extending along the interior surface thereof, and means located wholly outside the receptacle for moving the blade around the receptacle in continuous contact with the interior surface thereof, the lower end of the blade trailing the upper end in its movement around the receptacle whereby the melted cement in contact with the wall is forced downwardly toward the outlet.

3. A cement extruding mechanism comprising an inverted frusto-conical receptacle having an outlet opening in its lower end, means located exteriorly of the receptacle for heating the walls thereof, a frusto-conical annular member concentric with the receptacle and fitting within the upper end thereof, means for rotating said annular member about the axis of the receptacle, and a pair of spaced scraper blades depending from the annular member in contact with the interior wall of the receptacle throughout a major portion of the heightwise dimension of the receptacle.

4. A cement extruding mechanism comprising an inverted frusto-conical receptacle having an outlet opening in its lower end, means located exteriorly of the receptacle for heating the walls thereof, a frusto-conical anular member concentric with the receptacle and fitting within the upper end thereof, means for rotating said annular member about the axis of the receptacle, and a pair of spaced scraper blades depending from the annular member in contact with the interior wall of the receptacle throughout a major portion of the heightwise dimension of the receptacle, said blades being undercut and extending rearwardly with respect to the direction of rotation of the annular member.

References Cited in the file of this patent UNITED STATES PATENTS 73,272 Wilox Jan. 14, 1868 466,881 Russell Jan. 12, 1892 616,229 Euston Dec. 20, 1898 735,281 Mitchell et al. Aug. 4, 1903 875,228 Witham Dec. 31, 1907 1,291,759 Bunnell Jan. 21, 1919 1,422,768 Kent et al. July 11, 1922 1,424,575 McPherson Aug. 1, 1922 1,720,398 Harrigan July 9, 1929 (Other references on following page) .8 Repsher et a1 Feb. 24, 1942 Davis et a]. June 10, 1952 Erdmenber et a1 Nov. 10, 1953 FOREIGN PATENTS Switzerland July 4, 1939

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