Cutting – Means to drive or to guide tool – Plural tools selectively engageable with single drive
Patent
1992-11-27
1994-11-29
Briggs, William
Cutting
Means to drive or to guide tool
Plural tools selectively engageable with single drive
72446, 83563, 483 28, B21D 2826, B21J 1304
Patent
active
053679350
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a turret punch press, and, in particular, to a turret punch press on which is mounted a plurality of turrets.
2. Description of the Prior Art
As is commonly known, a conventional turret punch press comprises: a C-shaped frame integrally provided with an upper frame and a lower frame; a workpiece transfer and positioning device supported in a freely transferable manner in the X-axis and Y-axis directions on the frame, a plate-shaped workpiece which is to be transferred and positioned in the X-axis and Y-axis direction; a plurality of freely rotatable upper turrets, each of which supports a plurality of punches for punching the workpiece; a plurality of lower turrets, each of which supports a plurality of dies in opposition to the above-mentioned punches; and a striker provided with free vertical motion on the frame for striking the punches.
In a turret punch press with such a configuration the number of punches and dies which can be mounted at one time on the upper and lower turrets is limited, which imposes limitations on the processing.
Accordingly, in recent years, in order to increase the variety of processing, technology has been developed for automatically mounting/dismounting and changing the punches and dies on the upper and lower turrets, using an automatic tool changing device, for example, as disclosed in US Pat. No. 4624044 and in Japanese Laid open Patent Application No. 63-26225.
However, in this conventional technology, the problem arises that, when the punches and dies are changed on the upper and lower turrets of the turret punch press, the punching operation on the plate-shaped workpiece must be halted, to the detriment of the operating efficiency.
SUMMARY OF THE INVENTION
A first object of the present invention is to provide, with due consideration to the drawbacks of such conventional methods, a turret punch press on which a punch and a die mounted on opposing upper and lower turrets can be readily mounted or dismounted even while a punching operation is being performed on a workpiece.
A second object of the present invention is to provide a turret punch press on which a punch and a die mounted on opposing upper and lower turrets can be readily mounted or dismounted even while a punching operation is being performed on a workpiece, and which can also perform processes other than the punching of a workpiece.
These objects are achieved in the present invention by the provision of a turret punch press provided with a plurality of upper arms, each of which supports an upper turret in a freely rotatable manner, and a plurality of lower arms, each of which supports a lower turret in a freely rotatable manner, on a holder frame which is supported in a freely swinging manner on a frame on the turret punch press.
Accordingly, by means of the present invention, during a punching operation which is being performed on a workpiece using the punches and dies mounted on the upper and lower turrets, while the one set of upper and lower turrets is supported in a freely rotatable manner on one set of upper and lower arms on a holder frame and positioned at the processing region, it is possible to perform the mounting/dismounting and changing of the punches and dies on another set of upper and lower turrets which are supported in a freely rotatable manner on another set of upper and lower arms.
Accordingly, it is possible to perform, with greater efficiency, a punching process by means of a greater number of punches and dies, wherein, after completion of the punching process by the punches and dies mounted on one set of upper and lower turrets, the holder frame is revolved so that it becomes possible to perform a punching process by means of another set of punches and dies mounted on another upper and lower turrets, by positioning this other set of upper and lower turrets at the processing region.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other objects, features, and advantages of the present invention will beco
REFERENCES:
patent: Re31042 (1982-09-01), Clark et al.
patent: 3991602 (1976-11-01), Harcuba et al.
patent: 4423546 (1984-01-01), Scott et al.
patent: 4624044 (1986-11-01), Bredow et al.
patent: 4907480 (1990-03-01), Kuroyone
Amada Company Limited
Briggs William
LandOfFree
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