Turning – Lathe – With work feeder or remover
Reexamination Certificate
2000-12-08
2004-07-06
Wellington, A. L. (Department: 3722)
Turning
Lathe
With work feeder or remover
C082S127000
Reexamination Certificate
active
06758118
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a bar feeder provided with a bar facing device.
As it is known, in feeders used for feeding automatic lathes, the bar to be machined is taken from a magazine and placed in a guiding channel along which a pusher element, known as bar pusher, moves. Said bar pusher acts on the rear end of the bar and causes it to advance in successive steps which are equal in length to the machined parts to be obtained.
With these feeders it is not possible to machine the last portion (end segment) of the bar; since said portion cannot be gripped by the collet of the lathe because the bar has been used up, it is allowed to drop, causing problems for removing it from the lathe.
Bar feeders are also known in which the end portion of the bar can be recovered by fitting the bar pusher with a specifically provided collet suitable to grip the rear end of the bar inserted in the guiding channel. Thereby, when the bar is used up, the end portion remains attached to the collet and can be recovered when the bar pusher is retracted. However, in said bar feeders the outside dimensions of the collet must be greater than the diameter of the bar and therefore there are considerable problems in providing the guide in order to prevent vibrations and noise due to knocking inside said guide.
It should also be noted that the bars are available with opposite ends that have uneven regions due to cropping. These uneven regions, in order to avoid off-centering upon engagement of the bar pusher, are often removed by subjecting the bar to preliminary facing in a machine tool, hence with considerable additional costs.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide a feeder equipped with a device which is suitable to perform the facing of the rear end of the bars within the machining cycle of said bars and therefore with a significant reduction in machining costs.
Within this aim, an object of the present invention is to provide a feeder equipped with a device which is suitable to prepare the rear end of the bars so as to allow to use a bar pusher provided with a collet having diametrical dimensions that do not exceed the dimensions of the bar to be machined thereby allowing to recover the end portion of the bar and also eliminate vibration and noise.
This aim and this object are achieved with a bar feeder for feeding an automatic lathe, comprising a bar magazine and a guide supplied by said magazine, characterized in that a facing device is associated with the end of said magazine that lies opposite the end that is adjacent to said lathe and is suitable to machine the rear end of the bar on which the bar pusher engages.
REFERENCES:
patent: 3774753 (1973-11-01), Jones
patent: 5140878 (1992-08-01), Fabbri
patent: 691 087 (1953-05-01), None
IEMCA Giuliani Macchine Italia S.r.l.
Josif Albert
Modiano Guido
O'Byrne Daniel
Walsh Brian D.
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