US3035287A - Device for lasting the uppers of footwear - Google Patents

Description

May 22, 1962 J. vLcEK ET AL 3,0352

DEVICE FOR LASTING THE UPPERS OF FOOTWEAR Filed July 26, 1960 5 Sheets-Shea@I 1 May 22, 1962 1. vLcEK ET A1.

DEVICE FOR LASTING THE UPPEES OE FOOTWEAR Filed July 26, 1960 5 Sheets-Sheet 2 INVENTORS. Jardin fr Vfcek BY Mirasav Vaj May 22, 1962 J. vLcEK ET Ax.

DEVICE FOR LASTING THE UPPERS OF FOOTWEAR Filed July 26, 1960 3 Sheets-Sheet 3 INVENTORS. Jarvmz'r V'el( BY Mz'raav Vajz' @M {m/gr United States Patent Ohce 3,035,287 Patented May 22, `1962 3,035,287 DEVICE FOR LASTING THE UPPERS F FOOTWEAR Jaromr Vlek and Miroslav Vajk, Gottwaldov, Czechoslovakia, assignors to Zavody presneho strojirenstvi, Gottwaldov, Czechoslovakia Filed July 26, 1960, Ser. No. 55,817 Claims priority, application Czechoslovakia Aug. 4, 1959 6 Claims. (Cl. 12--12.4)

' The present invention relates to a device Ifor lasting the uppers of footwear, and deals more particularly with a device for injecting the adhesive when lasting the front part of the shoe upper.

.Known devices for applying an adhesive to the edge or margin of the insole were designed to gradually wipe the fold or margin of the upper inwardly by means of wiping devices equipped with cylindrical or conical rollers, and to accordingly supply adhesive from a nozzle either in liquid state or in solid state in the shape of a tapelike extrusion. When the adhesive is injected in the course of a one-stroke lasting operation, a nozzle is used to emit the adhesive only at the toe portion of the shoe, the adhesive being discharged through a continuous slot closed by a diaphragm. The injection of the adhesive, and even the positioning of the device above t-he shoe are carried out Iby hand. Waste of the adhesive and soiling of all mechanisms thereby are the disadvantages inherent in the heretofore known devices.

The present invention aims at removing said shortcomings. According to the main feature of the invention, nozzles are provided which are adapted -to be automatically -spaced `apart and are equipped with a system of injection openings for a one-stroke injection of the adhesive along the circumference of the insole and along the inner surface of the margin of the shoe upper.

The accompanying drawings represent an exemplary embodiment of the device according to the invention.

vFIG. 1 is an elevational view, partly in axial section, of the device which is shown in full lines in its operative position,

FIG. 2 is a top plan view of the device of FIG. l,

FIG. 3 is a cross sectional view taken along the line 3-3 on FIG. 2,

FIG. 4 is a cross-sectional view taken along the line 4-4 on FIG. l,

FIGS. 5, 6 and 7 are detail plan views of a cam-plate included in the device embodying the invention and shown in various positions occupied by the cam-plate during an operating cycle of the device, and

FIGS. 8 and 9 are sectional views each corresponding to a portion of FIG. l, and showing a driving of actuating means of the device in additional positions occupied thereby during an operating cycle of the device.

The device according to the invention generally comprises injection means, displacing means and driving means.

Referring in detail to FIGS. l, 2 and 3, it will be seen that the injection means comprises injection nozzlesA 1 and 2, the outer contours of which correspond to the contour of the insole 77, as shown in FIG. 4. The injection nozzles 1 and 2 are secured to the lower ends of vessels 3 and 4, respectively, which are mounted for angular displacement about a vertical axis by means of lugs 5 and 6 turna-ble on a hollow pivot 7 and being pressed down-` wardly by a spring 8 against a yoke 9 on the lower end of pivot 7. A pin 10` carrying a pressure pad 11 is slidable in yoke 9 and is urged downwardly or loaded by a spring 12.

Mounted in the bore of the pivot 7 is an axially slid-A able pressure pin l13 abutting at its `upper end against one arm of a two-armed lever 14 pivotally mounted on a pin 15, which is xed in a fork 16, the latter being rigidly connected to the head of the hollow pivot 7. The other arm of the two-arm lever 14 is widened to `form a laterally extending plate 17, which carries at its ends set screws 18 and 1,9 abutting against the top end surfaces of pistons 20 and 21, which are slidable in cylinders forming parts of vessels 3 and 4 and are urged to their upper position by means of springs 22 and 23 (FIG. 3).

'I'he vessels 3 and 4 have openings `83 communicating with the lower ends of the cylinders receiving pistons 20 and 21, and are further provided with extensions 24 and 25 (FIG. 2), the ends of which carry rollers 28 and 29 rotatably mounted on pins 26 and 27. A tension spring 30 is connected to pins 26 and 27 and acts to move apart, the vessels 3 and 4 together with the nozzles `1 and 2. Guide rails 31 and 32 (FIGS. l and 2) are engageable by rollers 28 and 29 and act against the force of spring 30 to move the vessels '3 and 4 and the related nozzles 1 and 2 toward each other. The injection nozzles 1 and 2 are provided with distribution channels 35 and 36 extending from the lower ends of the cylinders containing the pistons 20 and 21 to injection openings 39 and 46 leading to the outer circumference of nozzles 1 and 2. The upper and lower ends of channels 3S and 36 are normally closed by ball-check valves 33 and 37 and by ball-check valves 34 and 3-8, respectively, which permit flow through the chaunels only in the direction toward the openings 39 and 40. For the purpose of a wider -use of the device the vessels 3 and 4 are provided in their lower portions with heating elements 41 and 42 and with a control thermometer 43.

The `displacing means comprises a four-joint mechanism including a movable joint 44 arranged in the yoke 9 at the lower portion of the hollow pivot 7, and another movable joint 45 at top portion of pivot 7. The movable joint or pivot 44 is mounted at one end of a lever 46, the other end of which is mounted for rotation about a pin 47 in a bracket 48. The movable joint or pivot 4'5 is carried by an end of one arm of a two-armed lever 419 pivoted on a pin 50, which is xed on an extended arm 51 rigidly connected to the bracket 48. The end of the other arm of the two-armed lever 49 has a cable 53 fixed thereto by a screw 52, said cable passing over a roller 54 `and having a weight 55 suspended from its end, with the result that the entire injection means is urged to an extreme upper position shown in broken lines on FIG. l.

The driving means comprises a cylinder 56 (FIG. 2) actuated pneumatically or hydraulically and having a reciprocable piston rod 57 connected to a yoke 58, entraining a cam-plate 59 in a laterally extending guideway 60. The cam-plate 59 is provided at its underside with a curved groove 61 shown in broken lines on FIG. 2 and having a roller 62 engaged therein. The roller 62 is mounted on a pin 63 which is rigidly connected to the shorter arm of a two-armed lever 64, the longer arm of which actuates the driving rod 65 of a not-illustrated wiping device. At the upper side of the cam-plate 59 a template 66 is arranged, along whose circumference a roller 67 is adapted to roll, said roller 67 Ibeing mount? ed on a pin 68 which is rigidly connected to a slidable insertion piece 69. The insertion piece 69 is retainedk by means of a plug 71 in the cavity of a rack 72, which is slidably mounted in the bracket 48 and whose teeth 73 mesh with a gear Segment 74 on the lever 46. A spring 70 in the cavity of rack 72 acts on piece 69 to urge the latter against plug 71.

Secured to the bracket 48 by means of a holder 75 is a resilient buffer 76 which limits the movement of the rack 72. The pad 11, as well as the nozzles 1 and 2 abut downwardly against the insole 77 xed to the last 78 on which the shoe upper 79 in stretched condition is clamped by means of a proled mould member 80 along.

the circumference of the last. The wiping operation is effected by wiping members 81 of a not-illustrated wiping apparatus.

The device according to the invention operates as follows:

`The driving means sets in operation the whole device by extending the piston rod 57 out of the cylinder 56 from the position shown in FIG. 5 to the position of FIG. 6. The piston rod S7 acts through the yoke 58 to correspondingly move the cam-plate 59 with the template 66. During such movement of template 66, the roller 67 rides along the surface 66a thereof (FIG. 5) and is displaced toward the left, as viewed in FIG. 1. Due to the displacement of the roller 67 the rack 72 is shifted, with the result that the lever 46 is turned, or drops, and by means of the four-joint mechanism the injection means is displaced from the position shown in FIG. l in broken lines, to the position shown in full lines. During the downward movement of the injection means, the rollers 28 and 29 move along guide-rails 31 and 32 and thus are held relatively close together, as in the position indicated in broken lines at 1 and 2' on FIG. 4. Meanwhile the spring loaded pressure pad 11 rests against the insole 77. During further lowering of the injection means, the rollers 28 and 29 slide from the guide rails 31 and 32, with the result that the spring 30 is then effective to move apart the nozzles 1 and 2 to the positions shown in full lines on FIG. 4, that is, along the edge of the insole 77 and against the raised edge or margin of the shoe upper 79. In the meantime thelower end of the pin 13 strikes against a projection of the wiping apparatus and thus is moved upwardly relative to pivot 7 to rock two-armed lever 14, so that both pistons 20 and 21 move downwardly in the related cylinders and discharge the adhesive past the ball valves 33 and 34 to channels 35 and 36 and past the ball valves 37 and 38 to injection openings 39 and 40, whence the adhesive is injected along the periphery of the insole as far as the raised edge of the upper. The sizes and spacing of the various injection openings as well as the quantity of the adhesive discharged by downward stroking of pistons 20 and 21 are chosen such that a coherent layer is formed in the course of the wiping operation. The same purpose may be served by making the ball valves 37 and 38 adjustable.

The cam-plate 59, in addition to causing movement of the injection means, as described above actuates the not illustrated wiping apparatus due to the roller 62 moving in the curved groove 61 and causing swinging of the twoarmed lever 64. Thus the rack 65 of the wiping apparatus is displaced and the wiping members 81 of said apparatus are moved against the shoe upper. The shape of the template 66 is selected so that the injection nozzles 1 and 2 are slightly raised above the insole 77 upon operation of the wiping apparatus. The wiping members 81 operate in the meantime along the whole circumference of the shoe upper pressing the edge of the upper against the raised nozzles 1 and 2, and then into the gap formed between the nozzles 1 and 2 and the insole 77.

Before the cam-plate 69 reaches its extreme position of FIG. 6, with FIGS. 5 to 7 illustrating various positions of the roller 67 relative to the template 66, the roller 67 leaves the template 66 so that the injection means is then free to be returned to its upper extreme position, shown in FIG. l in broken lines, by the action of the weight 55 suspended by cable S3 from lever 49. During return movement of the cam-plate 59 by cylinder 56, the roller 67 rolls along the other side surface 66b of the template 66 as in FIG. 7, with the result that even after the injection means has attained its extreme upper portion, pin 68 further displaces piece 69 toward the right, as viewed in FIG. 9, within the cavity of rack 72, and thereby compresses spring 70. FIG. 8 shows details of FIG. l in inoperative positions corresponding to the showings of FIGS. 5 and 6, while FIG. 9 corresponds to the operational condition of FIG. 7. At the end of this movement, due to the roller 67 having left the template 66, as in FIG. 5, the insertion piece 69 is pushed by spring 70 against plug 71, carrying with it the pin 68 and the roller 67 back to their initial position. The device is thus prepared for a further working cycle.

Since the device according to the invention has a divided nozzle or two separate nozzles which can be moved apart, the adhesive is injected at the periphery of the insole, no matter what size insole is employed, without necessitating any Spacial adjustment. This possibility of moving the nozzles laterally away from each other until they rest against the insole, together with the vertical swinging movement of the whole injection means serves to prevent the creasing of the edges of the shoe upper. The injection nozzles also perform the function of spreading or smoothing the waved edges of the shoe upper, so that the edges of the upper, when folded under pressure of the wiping members, Wipe with their underside the adhesive from the nozzles, with the result that adhesive cannot drip from the nozzles. By using a single driving cam-plate 59, the synchronization of the injection means and wiping apparatus is ensured.

We claim:

1. A device for applying adhesive to the periphery of an insole for attachment of the margin of a shoe upper to the insole, said device comprising a frame, a last for supporting a shoe upper and insole in predetermined relationship to said frame with a margin of the shoe upper projecting beyond the periphery of the insole, a pair of nozzles having contours correspoding to the peripheral contour of the insole, support means mounting said nozzles on said frame for movement asa unit toward and away from said last and for lateral movement toward and away from each other, actuating means acting on said support means to effect said movement of the nozzles as a unit toward and away from the last, said nozzles having injection openings -arranged therealong, adhesive supplying means operative upon the movement of said nozzles adjacent to an insole on said last to eject adhesive from all of said openings simultaneously against the periphery of an insole on the last, and nozzle displacing means normally disposing said nozzles laterally close to each other and operative upon said movement of the nozzles adjacent to yan insole on said last to move said nozzles laterally -away from each other against the inner surface of the margin of the shoe upper projecting beyond the periphery of the insole on said last.

2. A device as in claim l; wherein said nozzles move as a unit toward said last to a position spaced slightly from an insole on the last so that a gap remains between said nozzles and the insole; and further comprising wiping members -acting against the margin of the shoe upper to wipe the margin inwardly against said nozzles and into said gap.

3. A device as in claim 2; wherein said nozzles have channels therein for distributing the adhesive to said openings, and further comprising valve means in said channels Which 'are spring urged to closed positions to prevent the discharge of adhesive from said openings except upon operation of said adhesive supplying means.

4. A device as in claim I1; wherein said ysupport means includes a carrier movable toward and away from said last, and said adhesive supplying means includes an adhesive containing vessel for each nozzle having the latter mounted thereon and being swingably mounted on said carrier for said lateral movement of the nozzles toward and away from each other; and wherein said nozzle displacing means includes a spring connected to the adhesive containing vessels to urge the latter to swing relative to said carrier in the direction moving said nozzles laterally away from each other, rollers on said vessels, and guide rails ixed relative to `said frame and engageable by said rollers, said guide rails being shaped to hold said nozzles laterally close to each other when said nozzles are spaced from said last by more than a predetermined distance and to permit said spring to cause movement of said nozzles laterally away from each other when the nozzles are within said predetermined distance from said last.

5. A device as in claim 4; wherein said actuating means for eiecting the movement of the nozzles as a unit includes a weight connected to said support means to urge the latter in the direction moving said nozzles as a unit away from said last, `and selectively power operated means also connected to said support means for overcoming the action of said Weight and displacing said support means in the direction for moving the nozzles as a unit toward said last.

6. A device as in claim 5; wherein said selectively power operated means includes a uid pressure actuated cylinder having a reciprocable piston rod extending therefrom, a cam plate connected to said piston rod for reciprocation with the latter, a template on said cam plate, a rst roller engageable with said template and being displaced by the latter in response te movement of the template with the cam. plate, and mechanism responsive to displcement of said iirst roller by said template upon movement of the latter in one direction to effect movement ff said carrier in the direction moving the nozzles away from the last.

References Cited in the le of this patent UNITED STATES PATENTS 2,035,483 Engel Sept. 29, 1936 2,6 [4,527 Kamborian Oct. 21, 1952 2,969,555 Kamborian Ian. 31, 1961

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