Boots – shoes – and leggings
Patent
1988-10-03
1991-04-16
Fleming, Michael R.
Boots, shoes, and leggings
36447418, 364191, G06F 1500
Patent
active
050088289
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the field of machine tools and, more particularly, to the field of lathes, and its subject is a tool lathe with programmable tool movement.
It is recalled that a lathe is a machine tool which essentially consists of a frame supporting, at one end, a part, which is called a fixed headstock, which itself supports a chuck by means of a rod and of a part, which is called a bed, consisting of a pair of guide ways, called a slide, which are parallel to each other and parallel to the axis of the rod. A movable headstock, comprising a tailstock with an axis which is merged with that of the rod, is mounted on the guide ways; the movable headstock may be displaced along the slide and be fixed thereon at any point; the slide also supports and guides a movable tool-holder assembly, called a "saddle".
It is recalled that the name "center lathes" is given to lathes in which the movements of the tool, both in the direction (x) which is perpendicular to the axis of the rod and in the direction (z) which is parallel to the axis of the rod, are linked to the rotation (n) of the chuck; among these center lathes the so-called universal or tool lathe, which fulfils various functions which render it universal, is distinguished.
Copying lathes which constitute a variety of semiautomatic lathes and in which the piece to be machined placed between centers is machined by a tool which is displaced automatically along a contour imposed by a former are also known; the tip of the tool therefore describes a path which reproduces the contour; the latter may be either a shaped sheet of metal or a copy of the machined piece.
Copying lathes, called "cycled" lathes, by means of which the tool performs successive passes according to the copying contour, returning to its starting point after each pass while the path of the tool is, from one pass to the next and at the start of a pass close to the final path reproducing the contour to the final diameter dimensions of the machined piece are also known; for this purpose, the guide contour is translated from one pass to the next from the thickness of the chip to production of the final diameter dimensions of the piece; in short, manual operations are limited to placing a blank in the chuck and to removing the machined piece.
It will be noted that in copying lathes, including cycled copying lathes, it is not known, at least by the Applicant, for the contour to be modifiable without being removed from the lathe.
Finally, lathes whose tool path is programmable using microelectronic means and data processing are known; however, these lathes, called digital control lathes, require very long and therefore very expensive programming work and require personnel qualified in the subject, and are therefore used only in series production.
The idea of the invention was born from the observation that in general mechanical workshops there were currently in existence tool lathes, most of which are fairly old machines, because the development of the technique has led builders towards manufacturing more sophisticated digital-control machines; this direction is the result of the development of the demand for machines which are increasingly productive. However, conventional machines still have their place on the market and only old and accurate machines are retained in service. Part of the renewal of this stock of machines is currently provided by fairly cheap machines which, nevertheless, do not give the demanding technician complete satisfaction with respect to reliability. The economic crisis held back renewal of the stock of tool lathes when the renewal of the industry leads to a growing requirement for these machines; tool lathes of modern design must fulfil the demand of users seeking reliable and accurate machines which are very simple to use and reasonably priced.
An aim of the present invention is to propose to lathe operators a tool lathe which makes it possible to simply and rapidly predefine a machining contour and, this being predefined, to operate in the manner of copyin
REFERENCES:
patent: 4709509 (1987-12-01), Yoneda
patent: 4725959 (1988-02-01), Nagata
patent: 4789943 (1988-12-01), Yamanaka
patent: 4837703 (1987-06-01), Kakazu
Besancon Andre
Jacquard Bernard
Pinard Jean C.
Fleming Michael R.
Societe Somab S.A.
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