Turning – Lathe – With work feeder or remover
Reexamination Certificate
1998-07-29
2001-07-03
Tsai, Henry (Department: 3722)
Turning
Lathe
With work feeder or remover
C082S126000, C082S071000, C082S080000
Reexamination Certificate
active
06253650
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic coupling for feeding fluid-driven actuators, particularly for distributing pressurized oil among a plurality of hydraulic motors mounted on a rotating structure. The invention can be used in particular in drum feeders for feeding bars to multispindle automatic lathes.
Conventionally a multispindle automatic lathe is a machine tool comprising a plurality of machining stations which are distributed around a horizontal axis and in which specific machining operations are performed on a bar fed by a feeder. These machinings are, for example, screw cutting, turning, end-facing, parting and so forth.
The bar feeder is substantially constituted by a drum which is rotated about said horizontal axis by said lathe and comprises a plurality of concentric tubular guides which are angularly distributed around the rotation axis; an advancement device is associated with each guide and causes the advancement of the bars, taken from a magazine and inserted in the guides, toward the lathe. At the end of each individual machining, the drum rotates by the same angle that lies between the individual stations, so that the front ends undergo successive machinings.
After the drum has completed a rotation through 360°, the machining cycle is complete and the machined part is removed, while a new bar segment is made to advance toward the lathe to undergo the intended machinings.
It is known to use, as a device for the advancement of each bar in the corresponding guide, a chain or another similar element provided with a bar pusher sliding in the guide and actuated by a fluid-driven motor. The pressurized fluid is distributed to the individual motors by using a rotary distributor which is mounted on the rotation axis of the drum and is provided with mechanical devices for controlling the delivery and return of the oil that feeds the motors. Conventional rotary distributors entail the drawback that they do not allow optimum use of the machining stations of the lathe in case of very simple machinings of the parts. For example, if the simple parting of parts from a bar and the forming of a bore at one end are required, most of the machining stations are not used and act only as transit stations.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide a hydraulic coupling for feeding fluid-driven actuators which allows to vary at will the number of stations in which the bars to be machined are advanced, so as to increase the number of stations in which machinings are performed and thus fully utilize the production capacity of the lathe.
Within the scope of this aim, an object of the present invention is to provide a coupling which is structurally simpler than conventional rotary couplings and is therefore cheaper and safer in operation.
This aim and this object are achieved with a hydraulic coupling for feeding hydraulic actuators, particularly for distributing pressurized oil to a plurality of hydraulic motors mounted on a rotating structure such as a drum feeder for feeding bars to an automatic multispindle lathe, said motors being angularly distributed around the rotation axis of said structure, characterized in that it comprises a plurality of ducts which branch out axially from said structure and are angularly distributed with respect to said rotation axis, said ducts being connected to the delivery and the return of said motors at one end and, at the opposite end, by means of respective flexible hoses, to a stationary distributor for connecting said motors to a source of pressurized oil and to the oil discharge, said flexible hoses being arranged in a spiral around said rotation axis and having a length which allows the rotation of said structure with respect to said distributor through a preset angle, said distributor comprising valves for controlling said flexible hoses which are actuated so as to connect the intake and discharge of oil to and from said motors according to a programmed sequence.
REFERENCES:
patent: 2577203 (1951-12-01), Mariotte
patent: 2641969 (1953-06-01), Roehm
patent: 2877676 (1959-03-01), Swanson et al.
patent: 3760661 (1973-09-01), Eichenhofer
patent: 4299662 (1981-11-01), Hardin, Jr.
patent: 4423651 (1984-01-01), Hardee
patent: 5129438 (1992-07-01), Hamilton
patent: 27 27 434 (1978-10-01), None
patent: 40 38 660 (1992-06-01), None
patent: 0 289 703 (1988-11-01), None
patent: 0 299 083 (1989-01-01), None
patent: 0 460 667 (1991-12-01), None
Drei Andrea
Mingozzi Renato
Nenni Enrico
Iemca Giuliani Macchine Italia S.p.A.
Josif Albert
Modiano Guido
O'Byrne Daniel
Tsai Henry
LandOfFree
Hydraulic coupling for feeding fluid-driven... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic coupling for feeding fluid-driven..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic coupling for feeding fluid-driven... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2458125