US 3238544 A
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T. HELFRICH APPARATUS FOR COVERING SHOE PARTS P March 8, 1966 4 Sheets-Sheet l Filed Oct. 5, 1961 March 8, 1966 T. HELFRICH APPARATUS FOR COVERING SHOE PARTS 4 Sheets-Sheet 2 Filed Oct. 5, 1961 March 8, 1966 T. HELFRICH 3,238,544
APPARATUS FOR COVERING SHOE PARTS Filed Oct. 5, 1961 4 Sheets-Sheet 5 March 8, 1966 T. HELFRICH 3,238,544
APPARATUS FOR COVERING snon PARTS Filed Oct. 5, 1961 4 Sheets-Sheet 4 I I I L 123 f i 123 114' United States Patent f 3,238,544 APPARATUS FOR COVERING SHOE PARTS Theodor Helfrich, Frankfurt am Main, Germany, as-
signor to Walter Ulirich, Kaberau, Bavaria, Germany Filed Oct. 5, 1961, Ser. No. 143,123 Claims priority, application Germany, Oct. 6, 1969,
U 7,4 18 Claims. (Cl. 1249.1)
The invention relates to apparatus for covering shoe heels by forcing a heel bearing a pre-cut covering between resilient Wiping elements.
It is known to cover heels with a covering by forcing the heel together with the covering material through wiping elements clamped in a frame. In another example of construction, wiping dies are provided, which are mounted so to be resilient in the lateral direction and the contours of which dies are adapted to the heel shape. In these known devices, the wiping elements are substantially stationary and so adapted in shape to the heels to be treated that only a small number of heel shapes and sizes can be covered with them. Moreover, these devices enable only the peripheral surfaces of the heels to be covered, while the folding over of the edges of the covering onto the end faces of the heel has to be carried out either manually or by additional special devices.
The invention now discloses an apparatus whereby all conventional heel shapes and sizes can be covered and the folding over of the edges of the covering onto the end faces can also be carried out.
The method for solving the problem according to the invention is characterised in that after passing between jaws which effect the covering of the peripheral surfaces of the heel, the heel is passed, during the same feed movement, through a folder duct which folds the edges of the covering over the top attaching face and the toplift attaching face of the heel.
To enable an appropriately variable adjustment of the operative jaw surfaces to be obtained with respect to the heels in order to cover different kinds of shoe types and sizes, the heels are advantageously conducted over a feed path which includes an acute angle with the plane through the wiping jaws and the operative wiping surfaces at the jaws are adjusted by variations of the height and inclination of the jaws with respect to the feed path.
The apparatus for performing the method comprises a folder duct immediately behind wiping jaws on a heel feed path. Said duct is preferably formed by folder blocks which each cover a respective edge half of the respective one of the heel surfaces and which, as a result of elasticity or as a result of pivotability, are able to follow the heel faces in such manner that edges of the covering are pressed completely onto the end faces of the heel even when the latter are hollowed out to a certain extent.
The invention will be described further, by way of example, with reference to the accompanying drawings wherein:
FIG. 1 is a front view of a complete machine for covering shoe heels, in accordance with the present invention;
FIG. 2 is a side view thereof;
FIG. 3 is a partial view of wiping jaws with contact pressure sensers;
FIG. 3a is a side view thereof;
FIG. 4 shows a heel with a covering placed around the peripheral surface;
FIG. 5 is a perspective view of a folding element;
FIG. 6 is a section through the folding element of FIG. 5 on the line VI-VI;
FIG. 7 is a perspective front view of two top fold formers;
3,238,544 Patented Mar. 8, 1966 FIG.- 8 is a side view of another embodiment of wiping aws;
FIG. 9 is a plan view of the arrangement of FIG. 8; and
FIG. 10 is a view of another wiping jaw mounting.
In the machine illustrated in FIGS. 1 to 7, a heel 25, coated with adhesive, is placed, together with a manually applied covering 26 (FIG. 3) onto a slide 1 which is movable in a guide bed 1' of a frame of the machine, and is clamped fast by means of a lever. This lever 3, which is adapted to pivot about an axis 4, is operated through a link 5 by means of a hydraulic cylinder 2 fed by way of a conduit 31. The slide 1 is slidable upon actuation of a cable 6 fastened to a piston rod 7 of a hydraulic cylinder 8. Return movement of this slide can be effected by means of a counter-cable not shown or in some other way.
A bridge 11 carries two convexly curved wiping jaws 12. These jaws, the operative surfaces 22 of which each consist of a resilient material in a stiff retainer 23, are connected toegther at the outer or top end of the convex curvature by means of a flexible web 13. This web 13 may have slots for adjustment of the jaw spacing. As a result of the flexibility of the web 13 the jaws can be tilted or pivoted somewhat about their longitudinal axes. Near the end remote from the web 13, the jaws are secured to the bridge 11. To this end, the jaws 12 are each fastened by screws 14 on a respective lever 15 so as to be rotationally pivotably movable. These levers 15 are articulated on respective fork heads 16 and are also pivotably arranged in the feed plane of the heel under the controllable pressure of a spring 17. Moreover, the levers 15, mounted on the fork heads 16, are pivotable transversely to the feed movement against the pressure of respective springs 20. This is achieved by mounting the fork heads 16 so as to be pivotable on the bridge 11 by means of respective bolts 18. Upon rotation of hand nuts 19, the levers 15 can be appropriately adjusted to the heel shape, in the outward or inward direction. The pressure of the spring 20 can be controlled, as desired, to suit the conditions. The bridge is mounted so as to be vertically slidable by arranging it to bear upon a piston rod 9 accommodated in a hydraulic or pneumatic cylinder 10, so that the vertical position is adjustable and controlled feed movements can be performed. Cylinder 10 may be actuated independently of cylinder 8, or in automatic operation, the two cylinders may be actuated in a predetermined sequence.
Located in the direction of the heel feed, immediately.
behind the jaws 12 is a folder duct for folding in edges of the covering 27, 28 (FIG. 4) which project beyond the heel end faces. This folder duct is formed by folding members which cooperate with the four faces of the heel. Thus, a pair of folder blocks 43 is provided for the edge 27 of the covering at the top left attaching face of the heel, said edge 27 being lower most in the operating position, whilst a pair of fold formers 'is provided for the edge 23 of the covering at the top lift attaching face of the heel. For appropriate arrangement and mounting of these folding members 43, 50, two upright bars 41 are each fastened onto the machine frame with an appropriate spacing therebetween. The folding blocks 43 are each carried by a respective link 42 each held on a bar 41 by, for example, an arm 67 (FIG. 5). This link 42 which is angular is pivotal upon the bar or arm by means of a pivot 68 and, at its free end, it carries a rotary element which is rotatable about a pivot 61 and on a part 62 of which element 60 the folder block 43 is mounted. The folder block 43 is adapted to tilt about a horizontal axis (FIG. 6). Each block 43 has a presser contour 64 and a fold-over gap 63. To limit the tilting movement of each foldeer block a respective stop pin 66 is provided. A respective spiral spring is provided to reset the pivoting movement of each rotary element 60 and a tension spring 44 connects the two opposite links 42 to reset the pivoting movement of the links. The two links with their blocks point toward one another in an initial position and are spaced apart only far enough so that they can perform their pivoting movements without obstructing each other. In the initial position, the edges of the rotary elements are substantially in line with the edges of the respective links. In FIG. 5, therefore, both the rotary element 60 and the folder block 43 are shown in a slightly turned and tilted position, respectively. As a result of this rotatability about different axes, the folder blocks 43 are able to travel along the curvatures of the edges of the top attaching face and press the covering edges 27 snugly into contact therewith. The blocks 43 must be mounted rotatably on the link 42 because the top attaching face, in contradistinction to the top lift attaching face, is inclined towards the breast of the heel. This inclination or conicity is thus compensated for independently. In order that the blocks 43 may exert a sufiicient pressure on the heel contour on the folding-in of the covering, the tension spring 44 is provided, which opposes any moving apart of the two links 42. The tilting movement of the blocks, which is possible about the respective horizontal axis 65, also enables the folded-in edge to be pressed against a hollowed heel end surface.
Simultaneously with the folding-in of the covering edge 27 against the top attaching face, the fold formers fold in the covering edge 23 onto the top lift attaching face of the heel. These fold formers 50 are each carried by a respective pivot 52 so as to be axially slidable against the action of a respective compression spring 51. They are also rotatable about the axes 52 to compensate for the conicity between the top attaching face and the top lift attaching face of the heel. To enable these fold formers to be adapted to the heel height, the pivots 52 are vertically adjustable on the bars 41 and are secured in their position, by means of the locking screws 53. The fold formers each have an appropriately shaped fold block 54 with folding surfaces 55. In order to compensate for the hollowing usually provided at this end of the heel, contact pressure surfaces 58 of the fold formers 50 are curved appropriately.
The resilient jaws 12, as already stated, are slightly curved when viewed from the side and thus form a convex curve shape pointing in the heel direction. Moreover, the edge 24 of each resilient jaw element 22 is slightly convexly curved. These curvatures increase the possibility of adaptation to different heel contours by appropriate displacement of the operative wiping surface.
By appropriate variation of the spacing of the open ends of the jaws 12 it is possible to obtain adjustment to coarse and thick heels or for narrow heels. Depending upon the heel shape, it is possible to select that region of the resilient jaws 12 which should perform the wiping operation. This region can be displaced by the vertical movement of the jaws with respect to the invariable feed path of the heel to be covered. If, for example, the slide 1 is allowed to perform only a small part of its total movement as a first stage of movement and is then stopped and the bridge 11 is allowed-to move down, the heel covering operation is performeed by the narrow region of the jaws 12. If, on the other hand, the slide 1 performs a greater part of its total movement during its first. stage of movement and is then stopped and the jaws are moved down, the jaws meet the heel at a wide region thereof suitable for wide and thick heels. In the case of strongly curved heels, it is advantageous that the slide is moved until the heel abuts the jaws 12 before the latter are moved downwardly. For flat and less strongly curved heels, the jaws may be secured against any tilting movement and one nut moved vertically.
These variations in the individual movements may be varied as desired within appropriate adjustment to one another. Although it is advantageous to stop at least one element, for example, the jaws 12, during the wiping operation it is of course possible to perform the wiping operation without any interruption of the two motions.
In order to obtain suitable tension for fold-free covering during the operation of slipping the covering 26 over the peripheral surface of the heel by means of the jaws 12, according to a further feature of the invention, presser shoes 72 (FIG. 3) are provided. These press the projecting flaps of the covering 26 against the undersurface of the jaws 12 with an adjustable pressure. These presser shoes are each carried by a respective sensor 70, which are movable, for example, with the slide 1. These sensers '70 are, of course, mounted so as to be slidable with respect to the slide so that, on application against the jaws, the sliding movement is not impeded. The compression springs 71 effect the resetting of the presser sensers. It is advantageous to dispose these presser shoes and to allow them to engage in such manner that they not only effect the appropriate prestressing of the covering during the wiping process, but also prevent the projecting cover flaps from prematurely bearing against the adhesively coated heel during the sliding movement.
To increase the flexibility of the wiping jaws, the jaw blades 22 may also be divided longitudinally or be cut perpendicularly to the working edge.
The mode of operation is as follows: after the heel which is to be covered has been coated with adhesive and a piece of covering material has been applied thereto, the heel is clamped on the slide 1 by operation of the cylinder 2 and the slide then moves in the direction of and through the wiping jaws, the slide movement being such that it can be stopped at any predetermined point, until the jaws have completed covering the peripheral surface during their downward movement. If the heel has then passed through the jaws, the slide moves through the folding duct with the folding elements 43 and 50, which here fold the edges 27 and 28 on to the end faces of the heel. The heel thus covered in ejected either manually or automatically after passing through the folding duct, whereupon theslide returns into its initial position to receive a new heel.
In the exemplified embodiment, hydraulically operated Working cylinders are provided to perform the individual movements. It is obvious that the individual movements can also be performed manually, mechanically or electrically, although a completely automatic control, for example by means of a press-button system 30, is naturally to be preferred.
FIGS. 8-10 shows alternative embodiments of wiping jaws. The jaws 112, which each consist of a resilient blade 122 and a retaining stirrup 123 curved outwardly towards the free end of the jaw, are mounted by the stirrups 123 at respective pivots 113 on adjusting blocks 114 so as to be movable apart about said pivots. Leaf springs 115, also mounted on the adjust-ing blocks, tend to press the jaws 112 back into the initial position by means of their ends which bear against the respective retaining stirrup 123. In this position the inner edges 124 of the blades extend in substantially parallel relationship to one another. The adjusting blocks 114 are mounted slidably on a pivot 116 rotatable about its own longitudinal axis, and are lockable by screws 117 both insofar as lateral displacement and rotary angular positions are concerned. The pivot 116 is mounted l'otatably by its ends in bearing brackets 118 on the machine frame. Near these bearing brackets, pivoting levers 119 are clamped fast on both sides by means of clamping screws 120 and their other ends are connected by pivotal connections 121 to crank rods of vertical push rods 131. A tube 132 which is secured to the frame or housing of the machine and guides the reciprocating movement of the push rod 131 (FIG. 8) is shown only diagrammatically. If this push rod is now moved up and down in the working cycle, for example by means of a pressure cylinder (FIG. 2), the jaws 112 perform a pivoting movement which is marked by the arrows P (FIG. 8) the lowermost pivoted position being shown in broken lines. During this pivoting movement, the jaws wiping the heel 125 which is in the feed position and which, as in the previously described embodiment, is advanced from the clamping position 125 by the feed 103, 101 either with or without an interruption of movement in the wiping position, as far as the fold-in members 43, 50 (FIG. 2). The pivoting angle or pivoting range of the wiping jaws and the time at which they meet the heel to be covered are adjustable.
FIG. 10 shows another means for moving the jaws 112' apart. Here the retaining stirrup 123' is rotatably mounted, not at its end, but at an intermediate point, by means of a pivot 113', so that, on rotary movement of the jaws about their pivots 113', the operative edges 124 move in the opposite direction at their ends.
The invention is not limited to the exemplified embodiments illustrated. Thus, the bearing and retaining elements for the jaws and folder elements may be of different construction. Instead of the folder elements illustrated, folding elements of resilient material may be used, these ensuring the required resilience and adjustment without pivot axes, and it would also be possible to provide a closed folding duct of resiliently mounted folding elements.
Finally, fold-over plates may be provided behind the folding duct containing the folding elements, said plates being movable on both sides transversely to the heel feed direction in relation to the front surface of the heel in such manner that the covering edges are folded on to the front surface by said plates. In order that these foldover plates may not have any obstructive effect in the case of narrow heels, they are arranged to come into operation successively.
1. A shoe heel covering machine comprising a frame, a guide bed in said frame defining an inclined feed path for an adhesively coated heel provided with a loosely applied heel covering, sliding means reciprocating in said guide bed, clamping means on said sliding means for holding said heel and covering, means actuating said sliding means, a pair of wiping jaws pressing said covering against the heel advancing in said feed path, said jaws forming an acute angle with said feed path, which angle opens toward the advancing heel, and a folder duct in the direction of said feed path behind said wiping jaws, said folder duct comprising folding elements folding the edges of said covering on the top attaching and the top lift attaching faces of the heel.
2. The machine as claimed in claim 1, wherein said folding elements comprise a bottom pair of folder blocks and a top pair of fold formers.
3. The machine is claimed in claim 2, wherein each of said fold formers is disposed above the respective folder block on a common vertical bar.
4. The machine as claimed in claim 3, wherein said fold formers are vertically adjustable on said bar.
5. The machine as claimed in claim 2 wherein each of said folder blocks is pivotable about a transverse axis and rotatable about an axis which is normal to the inclined feed path.
6. A machine as claimed in claim 5 wherein said folder blocks are additionally pivotable about a second axis which is normal to the inclined feed path.
7. A machine as claimed in claim 2 wherein each of said folder blocks has a pressure contour and forms a fold-over gap above said contour.
8. A machine as claimed in claim 2 comprising opposing bearing axes carrying said fold formers axially slidably and freely rotatably, and spring means pressing said formers towards each other.
9. A machine as claimed in claim 8 including fold-over blocks on said fold formers provided with curved presser surfaces.
10. A machine as claimed in claim 1 including pressure members pressing said covering against the lower face of said wiping jaws.
11. A machine as claimed in claim 10 wherein said pressure members are mounted on said sliding means for longitudinal displacement against compression springs and for angular adjustment with respect to said sliding means.
12. A machine as claimed in claim 1 wherein the heel contacting surfaces of said wiping jaws are made of resilient material and wherein said jaws are at one end connected with each other.
13. A machine as claimed in claim 12 wherein said jaw connecting means is a flexible web.
14. A machine as claimed in claim 7 wherein said jaws are vertically adjustable.
15. A machine as claimed in claim 7 wherein said jaws are laterally adjustable.
16. A machine as claimed in claim 12 including articulated levers pivoting said wiping jaws about a stationary axis into the heel feed path.
17. A machine as claimed in claim 12 including pivots permitting said wiping jaws to be pivoted apart.
18. A machine as claimed in claim 1 comprising a stationary axis about which said wiping jaws are adapted to pivot into said heel feed path.
References Cited by the Examiner UNITED STATES PATENTS 1,760,147 5/1930 Kershaw 12-147 1,866,728 7/1932 Smith 12--49.1 2,032,449 3/1936 Tetlow 12147 2,328,695 9/1943 Ushafoff 12-49.1 2,972,760 2/1961 Lipp 1249.1 3,023,435 3/1962 Bacon et al. 1249.1
I ORDAN FRANKLIN, Primary Examiner.
EDWARD V. BENHAM, Examiner.