US3409921A - Combined heel, forepart, and cement lasting machine - Google Patents

Description

NOV. 12, 1968 Kv STElN ET AL 3,409,92

COMBNED HEEL. FOREPART, AND CEMENT LASTNG MACHINE Filed April 3,9, 1967 4 Sheets-Sheet 1 BY mgl-M ATTORNEYS Nov. 12, 1968 K. STE|N ET AL COMBINED HEEL, FOREPART, AND CEMENT LASTING MACHINE 4 Sheets-Sheet 2 Filed April 19. 1967 INVENTORS' 444e 5227A/ ATTORNEYS Nov. l2, 1968 K, STE|N ETAL 3,409,921

CQMBINED HEEL, FOREPART, AND CEMENT LASTNG MACHINE Filed April 19, 1967 4 Sheets-Sheet 5 BY Ww ATTORNEYS Nov. l2, 1968 K. STEIN ET AL 3,409,921

CMBINED HEEL, FOREPART, AND CEMENT LASTNG MACHINE Filed April 19. 1967 4 Sheets-Sluit??l 4 INVENTORS MM2 Sra/M By //fea/r .fm/wou@ United States COMBINED HEEL, FOREPART, AND CEMENT LASTING MACHINE Karl Stein and Herbert Schindler, Pirmasens, Germany,

assignors to Firma Schon @t Cie, Gesellschaft mit beschrankter Haftung, Pirmasens, Germany Filed Apr. 19, 1967, Ser. No. 632,023 6 Claims. (Cl. 12-12.5)

ABSTRACT OF THE DISCLOSURE BACKGROUND OF TH'E INVENTION (l) Field of the invention This invention relates to an improved combination heel, forepart, and cement lasting machine having a last holder and Va carriage horizontally movablev towards the heel portion of the last to carry a 'hell-band, a cutter pair and an insole support, and 4more particularly to such a machine in which automatic'tripping means are provided. i

(2) Description of the prior art In prior art machines the carriage together with the heel-band, the cutter pair and the insole support is moved towards the last, the latter being accommodated on a last pin of the last holder by means of a last thimble. This is accomplished in that, following the stretching of the upper leather in the longitudinal direction, the carriage executes a movement tow-ards the heel portion of the shoe or last. The heel-band must not be brought into engagement at first. It must possess an adjustable stop of approximately 243 millimetres from the rear last edge since initially the entire last mounted on the last carrier is moved upward so that the last bottom is the first to abut against the insole support. This ensures a precise positioning of the last bottom with respect to the subsequently engaged twopiece cutter. Were the heel-band to abut against the shoe prior to this movement, the npper leather would shift on the band, which must be avoided. Prior art heel, forepart, and cement lasting machines have an `adjustable boss limiting this forward motion of the heel-band, cutter and last support carrier.

The clearance between the rear last edge and the last thimble, with which the shoe is accommodated on the last pin is not `uniform in most of the lasts in common use. Differences of up to l millimetres are common within a single series of lasts since in conjunction lwith the present production methods there is no need to keep this clearance strictly uniform.

SUMMARY OF THE INVENTION In accordance with the objectives of this invention, the invention permits the use of modern production methods by ensuring that a precise distance is maintained between the rear last edge and the last thimble. At the same time, it permits the use of all types of lasts no matter what the distance between the last thi-mble and the heel contour.

The invention resides in the fact that a tripping blade is arranged in front of the heel-band at the level of the heel contour; it serves to actuate carriage movement cutout means, while slide means for the heel-band are arranged on the carriage, their movement being in the same attit 3,499,921 Patented Nov. 12, 1968 'ice BRIEF DESCRIPTION OF THE DRAWING Tlhe invention will be hereinafter more f-ully described with reference to the accompanying drawing, in which:

FIGURE l is a section through a combined heel, forepart, and cement lasting machine;

FIGURE 2 is a side view `of the heel-band, cutter halves and insole support carrier;

FIGURE 3 is a top view of the heel-band and tripping means; and

FIGURE 4 shows another embodiment of the heel-band ywith corresponding tripping means, in side view.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the figures, the carriage is identified by reference numeral 1, the cutter pair is 2, the heel-band 3, the last 4, the inner contour of the heel-band 5, the heel contour of the last 6, the tripping blade 7, its guide bolt 8, the return spring 9, an oblique face of the guide bolt 8 is 10, its guidance means 11, the tripping wheel of the limit tripping device is 12 and the limit tripping device itself 13.

FIGURE 4 shows a special embodiment, in which the limit tripping device 13 with, guidance means 11, the guide bolt 8 and the tripping blade 7 can be swung away from the heel-band 3. To achieve this a joint 14, a hydraulic cylinder 15 and a rod 16 are provided.

It can be seen in FIGURES l `and 2 that a hydraulic cylinder 18 is anchored on carriage 1; it carries heel-band 3 at the end of its rod 17.

A two-piece cutter or wiper 2 is attached by anchorage and actuation 'means (no-t shown) to carriage 1 for the heel-band 3, cutter and insole support. Heel-band 3 is positioned underneath cutter pair 2. It is made of a resilient material such as leather, plastic or rubber and may `be made inflatable. During its advance the `carriage moves in the direction of the last 4 clamped in the machine with a shoe mounted thereon. This movement is arrested when the rear contour 5 of the heel-band 3 is approximately 2 millimetres in front of heel `contour 6 of last 4. To -this purpose tripping blade 7 mounted in guide bolt 8 extends into the back region of the heelband. Return spring 9 brings guide bolt 8 into its initial position.

When carriage 1 moves towards the last, the tripping blade impinges on the rear edge 6 of last 4. Bolt 8 is forced out of its guidance means 11 against spring bias and abuts with its oblique face 10 against tripping wheel 12 of the limit tripping device 13; the latter is actuated thereby and causes a stoppage of the advance of carriage 1. If the carriage is actuated by hydraulic means, its stoppage is accomplished via a servopiston, while it it is driven by a motor, the limit tripping device 13 switches off the latter via a relay. Carriage 1 thus stops before heel-band 3 has reached the heel contour 6 of last 4. Next follows the application of the insole support 19. Connecting rod 17 of the actuating cylinder 18 then m'oves the heel-band to bring it into :a `close overall contact with the heel portion of the shoe in order to shape the latter and to bring about the cementing of the toe, lining and upper leather. The tripping blade 7 must be 3 very thin so that its insertion between the resilient heelband and the rear heel portion of the shoe does not interfere with the operation.

If, in the case of particularly delicate upper leathers, the tripping blade may do damage, the machine (see FIG. 4) has a provision whereby, following the stoppage of carriage 1, the tripping blade 7 with bolt 8 and housing 11 can be swung out of the way. This is accomplished by means of hydraulic cylinder 15 and rod 16, the pivoting point being round joint 14.

The tripping device can be also made to swing out of the way by other means, such as a mechanical rod system, an air cylinder, magnets, spindle drive, or the like.

We claim:

1. In a combination heel, forepart, and cement lasting machine having a last holder and a carriage horizontally movable towards the heel portion of a last on said last holder to carry a heel-band, a wiper and an insole support, the improvement comprising tripping means disposed in front of said heel-band, the action of said tripping means coming into contact with said heel portion thereby actuating disconnecting means for said mova-ble carriage, sliding means for said heel-band being provided on said carriage and moving longitudinally therewith, said tripping means being mounted on said sliding means.

2. In a combination according to claim 1, wherein said tripping means comprise a tripping blade mounted on a guide bolt provided therefor, said guide bolt being slidably supported in guidance means provided therefor in association with said disconnecting means.

3. In -a combination according to claim 2 wherein when said heel-band is in its operating position, said trip- `ping blade comprises a thin intermediate layer between the said heel portion of the last and said heel-band.

4. In a combination according to claim 2 wherein said tripping blade, said guide bolt and said guidance means are in removable relation with respect to said heel-band.

5. In a combination according to claim 4 wherein said guidance means `are in association with a` pivotal joint, said joint pivoting by the associated action of a hydraulic cylinder and a rod thereupon. l

6. In combination a heel, forepart, and cement lasting machine having a last holder and a carriage horizontally movable towards the heel portion of :a last on said last holder to carry a heel-band, a wiper and an insole support, a tripping blade lbeing disposedin front of said heel-band and serving to actuate carriage movement cutout means provided therefor, slide means for said heelband being mounted on said carriage and moving'horizontally therewith, said tripping blade and slidingmeans being in associated moving relation, said tripping blade being mounted in a guide bolt provided therefor, said guide bolt being slidably engaged in said cutout means, the action of said tripping blade coming into contact with the heel portion of the last resulting in the actuation of said cutout means.

References Cited UNITED STATES` PATENTS 2,490,897 12./1949 Butler et al.A l2-l2.5 3,090,980 5/1963 Forma lll-12.5

3,115,649 12/1963 Kamborign et al. 1214.4

PATRICK D. LAWSON, Primary Examiner.

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