Machine for pulling over and lasting toe portions of shoe uppers

Boot and shoe making – Lasting machines – Wiper folder

Patent

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Details

12 124, A43D 2116, A43D 2100

Patent

active

047776854

DESCRIPTION:

BRIEF SUMMARY
This invention is concerned with a machine for pulling over and lasting toe portions of shoe uppers comprising a toe support for supporting, bottom down, the toe end portion of a shoe comprising a shoe upper on a last with an insole on the last bottom, and a pincer assembly comprising an array of pincers disposed about the toe support for gripping lasting marginal portions of the toe end of the upper of a shoe supported by the toe support, wherein relative movement is effected, in a direction heightwise of the shoe, between said toe support and said pincer assembly whereby, with the lasting marginal portions of the shoe upper gripped as aforesaid, the toe end portion of the shoe upper can be tensioned over its last, the machine further comprising a heel support which is movable towards and away from the toe support between an operative position, in which the heel end portion of the shoe is engaged and supported thereby, and a position which it occupies in the rest condition of the machine (its "next start" position), means for moving the heel support between its operative and "next start" positions, and wiper means by which the lasting marginal portions of the toe portion of the shoe upper can be wiped over and pressed against corresponding marginal portions of the insole for securement thereto.
Machines of the aforementioned type are well known in the prior art. Such machines may be pneumatically or hydraulically controlled.
In operating machines of the aforementioned type, it is possible, by a manual unclamping, re-positioning and re-clamping sequence, to move the mounting for the heel support in order to accommodate different sizes of shoe. Otherwise, the machine has to be set up for the largest size of shoe, with the consequence that, when operating on small-sized shoes, the time taken to travel between the "next start" position and the operative position is unacceptably long, in terms of the length of the machine cycle and thus of the machine's productivity. Adjusting the heel support position, however, is itself disadvantageous in terms of productivity, especially where a wide range of shoe sizes is being processed through the machine.
On the other hand, where the operator is allowed to set the heel support position according to shoe length, an operator may, in attempting to reduce to a minimum the rturn movement of the heel support, so set the position that a shoe which has been operated upon is not readily ejected from the machine; it will of course be appreciated that ejection of a finished shoe usually takes place by allowing the heel support to be sufficiently retracted to enable the shoe to fall unimpeded out of the operating locality. Any impediment to the automatic ejection of shoes is of course in itself damaging to the productivity of the machine.
It is thus the object of the present invention to provide an improved machine for pulling over and lasting toe portions of shoe uppers, wherein the setting of the position of the heel support according to shoe length is facilitated, while minimising the risk of preventing ejection of the finished shoe as aforesaid.
This object is resolved in accordance with the present invention, in a machine as set out in the first paragraph above, in that the heel support has a plurality of pre-set "next start" positions, operator-actuatable selector means being provided for selecting one of said positions according to the size of the next shoe to be operated upon, and in that the heel support, in moving from its operative position, is first moved to a retracted position, in which the shoe held thereby is released, and thereafter, according to the selection of the operator, assumes its selected "next start" position.
It will thus be appreciated that, using such an arrangement, the operator merely needs to select the appropriate "next start" position, which position may be pre-set by factory management or indeed in the course of initial assembly of the machine, so that adjustment by the operator, and any time required for manually effecting it, is eliminated. Fur

REFERENCES:
patent: Re26860 (1970-04-01), Becka
patent: 2039448 (1936-05-01), Pym
patent: 3011186 (1961-12-01), Kamborian
patent: 3165771 (1965-01-01), Kamborian
patent: 4319373 (1982-03-01), Lauckhardt et al.
patent: 4530124 (1985-07-01), Sommer
patent: 4627124 (1986-12-01), Winter
patent: 4649584 (1987-03-01), Giebel
patent: 4653133 (1987-03-01), Giebel

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