Turning – Severing or cut-off – Interrelated means for tool infeed and circumrotation
Patent
1985-10-17
1987-03-03
Vlachos, Leonidas
Turning
Severing or cut-off
Interrelated means for tool infeed and circumrotation
279 1J, 414 18, B23B 2500
Patent
active
046465979
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a pusher head for feeder for automatic lathe, intended to equip a pusher and to intervene leaning against the rearward end of a bar of material to be machined, to push this bar in the direction of the lathe, this head including, to fit against the bar, a front recess which presents at least one inside conical surface part.
In practically all automatic feeders for machine tools, typically for automatic lathes, there are bar-guiding tubes which contain a pusher provided at the front, i.e., in the direction of the lathe, with a pusher head which pushes the bar of material to be machined toward the lathe. The pusher head is rotary, as well as, in general, the body of the pusher situated behind its head. At the rear of the body of the pusher, the latter is joined to a piston or other device for the application of pressure, this latter being most often non-rotatable, its connection to the pusher being made by means permitting mutual rotation. An illustration of such a conventional pusher is to be found, for example, in the Swiss patent specification No. 514,381. An identical design is used in the "Hydrobar"- type feed apparatus, manufactured by the firm LNS in Orvin, and the leaflets and maintenance manuals of which are at the disposal of the public.
In general, the rearward end of the bar of material to be machined was prepared by machining giving it a cone shape or else creating a frustoconical surface at the edge of the rear face of the bar. This latter way of proceeding is, for example, illustrated in Chapter 3.4.1.1. on page 14 of the instruction manual (accessible to anyone) for the "Superhydrobar" feeder, manufactured by the firm LNS in Orvin (CH). This same necessity of preparing the rearward end of the bar frustoconically is illustrated in FIG. 2 of the present specification.
The reason why it was hitherto necessary to prepare, conically or frustoconically, the rear of the bar of material to be machined coming to lean against the pusher head is explained by a glance at FIG. 1 of the present specification. One finds that if the rearward end of the bar were not suitably prepared, the widely open cone-shaped recess one had in the conventional pusher heads was liable to position the rear of the bar of material in a non-centered manner relative to the axis of the pusher. This appears obviously if one considers the rear face of a bar of material to be machined, in the rough state, assuming, something which may easily happen at the time of sawing the bar lengths, that the rearward end face is not absolutely perpendicular to the axial direction. FIG. 1 shows that that leads to an eccentric shifting e.sub.1 of the bar. Moreover, at the time of the preparatory sawing of the bar, it may frequently happen that the edge of the sawed face presents a burr of some kind, and, again, even if the rear face is perpendicular to the axis, this burr brings about an axial shifting e.sub.2 of the bar if the latter is placed in its rough state against the pusher head. This is the reason why, until now, the rearward end of the bar of material to be machined was always prepared to create there a conical or frustoconical centered surface, as shown, for example, by the accompanying FIG 2.
This additional operation of preliminary preparation of the rear bar end before it is placed in a feeder bar-guiding tube increased the cost of the operations of feeding bars to an automatic machine tool, typically an automatic lathe.
It would be well to mention here two prior publications which, in a certain way, touch on the problem of the centering of a part or bar in a rotary tip presenting a recess which comprises at least parts of conical surface. It is a matter of the specifications U.S. Pat. No. 2,118,301 and GB-Pat. No. 2,059,308. To tell the truth, the rotary tips proposed by these specifications are not feeder pusher heads but really spindle or counter-spindle fittings of lathes.
The American specification proposes a rotary tip which includes a widely open conical
REFERENCES:
patent: 906040 (1908-12-01), Lucas
patent: 2059308 (1981-04-01), GBX
patent: 2118301 (1938-05-01), Gegenheimer et al.
patent: 2741482 (1956-04-01), Abramoska
Societe de Vente et de Fabrication pour le Decolletage Lns SA
Vlachos Leonidas
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