Turning – Lathe – Multiple
Patent
1994-10-19
1997-04-15
Rachuba, M.
Turning
Lathe
Multiple
29 38D, B23B 904, B23B 910
Patent
active
056198949
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a multi-spindle automatic lathe intended for machining and more specifically for profile turning of materials supplied in bar form.
BACKGROUND OF THE INVENTION
Known multi-spindle automatic lathes are machines of complex structure and operation, in particular from a mechanical viewpoint. Such machines include a first functional portion known as the bar support which assures the feeding, holding and driving of the bars. This part is provided with a set of spindles in which are respectively introduced the bars of material in question, which bars project from said spindles towards the cutting tools mounted on a supporting structure.
Such spindles, all of which are mobile in rotation and which in certain cases are also mobile in translation, are brought together on a spindle carrier which itself is also arranged and adapted so as to be capable of being displaced at the same time in an axial direction and in rotation, in order to assure the displacement in turn of all the bars of material towards the different machining stations. Such machining stations include tools for cutting and/or for upsetting the material and the combined motions of the spindle carrier enable bringing the ends of the bars to be machined facing the appropriate tools in order that they undergo successive transformation stages from station to station at each fraction of a rotation of the spindle carrier.
It is thus understood that such machine tools must include a great number of pinions and gears meshing together in order to be able to drive in rotation all such movable elements and so as to furnish them with the necessary mechanical torque whilst, for the rest, enabling their relative displacement, whether this be in translation or in rotation. It can thus already be noted that the high number of parts in such first functional portion leads, in known lathes, to a very substantial space requirement and weight.
Furthermore, the cutting tools are generally mounted on tool bearing carriages, likewise movable, which can be displaced generally along a single axis and which are controlled in their displacement by rotatable cams profiled in order to assure a specific displacement of the tools at each work station. The cams are all mounted on a single cam shaft driven by a motor.
Again, in this second functional portion of the lathe, referred to as the machining portion, in which are concentrated the tools and more generally the means of forming the material, numerous gears and numerous pinions for driving cams in rotation are provided, but also and above all, a multitude of arms and levers, so-called transmission mechanisms, capable of transmitting the desired translation motions from said cams to the tool bearing carriages.
Here again, it is understood that on known multi-spindle lathes this second functional portion, in addition to its complex character in respect of its construction, is massive and of very high weight.
Additionally, the parts are arranged among themselves in order that the overall volume of the machine is not too exaggerated, which further complicates the conception thereof.
It is necessary to note again that in such known lathes, the two functional portions, respectively for bar support and for machining, are supported and guided by the exterior and are installed on a very imposing rigid framework largely responsible for assuring the precision of the machining and thus its quality.
It will be further noted that in known multi-spindle lathes the machining portion is divided into two blocks between which the operator may have access in order to effect adjustments. The operator thus must be placed laterally to the right or the left of the machine which requires substantial clearance around the latter. These lathes, such as they are conceived, thus occupy a substantial floor surface which necessitates consequential infrastructures.
SUMMARY OF THE INVENTION
An object of the present invention to provide an entirely reconceived multi-spindle automatic lathe of a far simple
REFERENCES:
patent: 2912892 (1959-11-01), Hoern
patent: 3688364 (1972-09-01), Ledergerber
patent: 4061060 (1977-12-01), Trautmann
patent: 4665781 (1987-05-01), Eichenhofer et al.
patent: 5115702 (1992-05-01), Link
Hansen Kenneth J.
Rachuba M.
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