Woodworking – Shaping machine
Patent
1996-07-19
1998-03-24
Bray, W. Donald
Woodworking
Shaping machine
144 481, 1441141, 1442421, 144 21, 269 21, 269289R, 409189, 409219, 409903, B27C 500, B27C 100, B25B 1100
Patent
active
057301956
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a machining apparatus for machining of flat workpieces of wood or woodlike material having a machining zone with one or more machining stations. The machining apparatus has at least one work rest having vacuum work holders which can be adjusted in the direction of a longitudinal coordinate (X-axis) and a transverse coordinate (Y-axis). The machining apparatus has a machining unit with a tool spindle which can be moved above a machining field relative to the X-axis as well as the Y-axis.
BACKGROUND OF THE INVENTION
Machining apparatuses according to the prior art which have a program-controlled machining unit, for the machining of flat workpieces, which include furniture parts or elements for interior decoration, can be used to machine the top side and the peripheral sides of the workpieces. The workpieces can, for instance, be milled along their periphery in order to impart to them a given peripheral contour, or they can be provided with holes or cutouts. The holding of the work on a work rest remains a problem in prior art machining apparatuses because the work rest must not be damaged during machining processes. The workpieces must be capable of being positioned on the work rest, the work rest itself must be capable of being positioned in the machining zone, freely in the direction of the X-axis and the Y-axis. Up to now, in known machining apparatuses, the workpieces were placed by hand on the work rest at the machining station and positioned there and they had to be removed from the work rest by hand after the machining.
It is not practical to clamp the workpieces on a conveyor means which moves cyclically through the machining zone, such as a conveyor chain, which is halted with a corresponding workpiece at the machining station during an individual machining process because the individual workpieces cannot be machined free of interference at those places which are supported by the conveyor means. In particular, when machining peripheral edges of a workpieces in prior art machining apparatuses, a collision between the machining tool and the conveyor means could not be prevented.
From Germany Patent 41 01 904 A1, a numerically controlled upper milling cutter is known which has a machining field with vacuum work holders for the workpieces. For the loading and clearing of the machining zone, a large number of conveyor devices linked to each other are provided, which have robots, feed and discharge conveyors, direction-change conveyors and synchronizing conveyors. For these conveyor systems an expensive control is necessary in order to transport the workpieces in each case in correct position and arrange them in correct position on the machining zone.
OBJECT AND SUMMARY OF INVENTION
It is a prime object of the present invention to provide a machining apparatus in which the loading of a work rest with workpieces at the location of the machining field and the further conveying of the workpieces after machining can be accomplished mechanically.
The foregoing and other objects and advantages of the present invention will appear more clearly hereinafter.
In accordance with the present invention, a machining apparatus includes a feed conveyor which has an alignment station and a discharge conveyer which adjoins a machining zone. Between the feed conveyor and the discharge conveyor, there is a transport device which is disposed at one side of the machining zone and which has displaceable work holders which grasp the workpieces at one of their edges.
This transport device receives the workpieces at the alignment station at the end of the feed conveyor, conveys them at substantially the same level to the machining station or to several machining stations in the machining zone, transfers them there to vacuum work holders on a work rest, and from there transports them after the machining to the discharge conveyor.
The workpieces pass in synchronism through the machining zone of the machining apparatus. The mechanical operation of the work rest permits an
REFERENCES:
patent: 4313478 (1982-02-01), Suzuki
patent: 4949942 (1990-08-01), Shoda
patent: 5094282 (1992-03-01), Suzuki et al.
patent: 5323821 (1994-06-01), Suzuki
Kempkensteffen Heinz
Riesmeier Wilhelm
Baxley Esq. Charles E.
Bray W. Donald
IMA Maschinenfabriken Klessmann GmbH
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