Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Reexamination Certificate
2000-03-01
2001-12-25
Ryznic, John E. (Department: 3745)
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
Reexamination Certificate
active
06332315
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an actuation and supply unit, particularly for auxiliary actuators suitable to actuate complementary fixtures and/or tools in die-forming presses.
Die-forming presses associated with other complementary fixtures or tools which complete the machining process are currently widely used.
Merely by way of example, the presses can be associated with blanking machines for trimming the edge flash of the die and with punches or other blanking tools used to form one or more holes.
In particular, presses associated with other fixtures or tools are provided with a main actuator which actuates the press and with which other auxiliary actuators are associated. The auxiliary actuators are usually independent and are adapted to actuate the fixtures or tools related to the complementary machining processes.
In particular, auxiliary actuators are currently constituted, in a first type of construction, by a mechanical cam which is actuated, by means of kinematic systems, by the same actuation as the press.
This embodiment, however, entails considerable problems in terms of bulk and complexity of construction.
In a second embodiment, the press works like a pump for the auxiliary actuators, which in this case are constituted by hydraulic pistons.
However, manufacturing and production practice has shown that this solution entails, in high-tonnage presses, an imbalance of the die; moreover, it is evident that the complementary machining operations can be performed only during the return step of the pressing cycle, i.e., when the press is rising, but this is exactly the step in which the press absolutely cannot act as a pump, since it is in the discharge step.
Hydraulic plants, including actuations for auxiliary actuators and hydraulic power accumulators are known, for example, from the prior documents CH-A-354 562, EP-A-0 661 125, EP-A-022 661, DEA-26 20 016 FR-A-1 436 264.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide an actuation and supply unit, particularly for auxiliary actuators suitable to actuate complementary fixtures and/or tools in die-forming presses, which solves the above-noted drawbacks of conventional solutions, particularly by making the actuation and supply of the auxiliary actuators substantially independent without causing drawbacks related to bulk and complexity in construction.
Accordingly, an object of the present invention is to provide a unit which avoids any imbalance of the die.
Another object of the present invention is to provide a unit which is particularly sturdy and flexible and can be applied to different presses.
Another object of the present invention is to provide a unit whose operation can optionally be made fully independent of the press.
Another object of the present invention is to provide a unit which is highly safe both for the machine and for operators.
Another object of the present invention is to provide a unit which can be manufactured with known technologies and at competitive costs.
This aim, these objects and others which will become apparent hereinafter are achieved by an actuation and supply unit, according to the invention, having the features set forth in claim
1
.
Further advantageous features of preferred embodiments of the invention are defined in the dependent claims.
REFERENCES:
patent: 3795110 (1974-03-01), Kobelt
patent: 4173866 (1979-11-01), Farr
patent: 4656833 (1987-04-01), Belart
patent: 4669235 (1987-06-01), Gratzmuller
patent: 4716812 (1988-01-01), Koerner et al.
patent: 4741247 (1988-05-01), Glomeau et al.
patent: 4959957 (1990-10-01), Schmale et al.
patent: A-354 562 (1961-07-01), None
patent: A-457 145 (1968-07-01), None
patent: A-26 20 016 (1977-11-01), None
patent: A-0 022 661 (1981-01-01), None
patent: A-0 661 125 (1995-07-01), None
patent: A-1 436 264 (1966-07-01), None
patent: A-2 149 492 (1985-06-01), None
Cappeller Augusto
Fiorese Massimo
Gallocchio Vanni
Pellanda Giampietro
Josif Albert
Modiano Guido
O'Byrne Daniel
Ryznic John E.
Special Springs S.r.l.
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