Abrading – Machine – Rotary tool
Patent
1994-07-18
1996-09-17
Rose, Robert A.
Abrading
Machine
Rotary tool
451460, 451379, 451408, B24B 4106
Patent
active
055563260
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a floating rotary drive device for a workpiece to be machined by grinding, of the type comprising a chuck securely attached, by a flexible control, to the output shaft of a motor and to means for positioning the said workpiece machining of which is completed.
In the machining by "plunge" grinding of some materials, particularly resilient or semi-resilient, it may be advantageous to give some slack to the workpiece in the course of machining and/or surfacing.
Such slack can be obtained only by a supple connection between motor and workpiece to be machined and this necessarily means variations in the relative positioning of the workpiece in the course of machining and of the drive device.
Now, although it is relatively simple to reposition rigorously, at rest, the workpiece machining of which is completed, for example with a device with springs coming to press the two ends of the shaft of the said workpiece against two stops having a definite position, the same is not true of the intermediate drive system between the motor device and the workpiece, even repositioned. In fact, at the moment of stopping, the position of this device remains random in the space where it has to move in order to permit the desired slack of the workpiece in the course of machining. Moreover, after release of the workpiece machining of which is completed, its supple connection with the motor does not even allow it to keep the same position.
The consequence is an absence of constant repetitive positions allowing an automation, by simple mechanization, of the operations of coupling with the new workpiece to be machined.
Moreover, it is plain that every workpiece must be coupled with this drive device so that it can be machined, and then released after machining.
SUMMARY OF THE INVENTION
The present invention has as its subject a device making it possible to solve the problem of the automatic coupling of workpieces to be machined by grinding with a floating drive device, as much with respect to the relative positioning between the latter and the workpiece to be machined as with respect to the construction of their mechanical connection.
The device according to the invention is essentially characterized in that it comprises means for automatic coupling of the said workpiece with the said chuck the means being actuatable at the end of a machining operation in order to come to bear against the said chuck in order to centre the said chuck so that its axis of rotation is merged with the axis of rotation of the workpiece machining of which is completed, and to immobilize the said chuck in this position during the removal of the workpiece machining of which is completed, and the fitting of a new workpiece, the said coupling means being actuatable so as to free the said chuck from the time of this fitting in order to permit the desired slack of the next workpiece to be machined.
According to a further feature of the invention, the gripping means are constituted by a fixed frame bearing several elements disposed circularly and defining between them a free space which corresponds to the set of positions which the drive device may have during the machining, the said elements being capable of drawing radially nearer to one another in the manner of a diaphragm so as to come to imprison the said drive system in a position where its longitudinal axis will be merged with that of the workpieces positioned after machining.
In a simplified embodiment of the invention, the gripping means are constituted by a clamp with at least one element which is articulated on a fixed point and comprises a jaw, the working surface of which has a profile comprising at least two parts slanting in opposition to one another so that the device for driving the workpieces in machining is placed automatically in the hollows of the Vs formed by the jaws and is thus positioned in precise manner with respect to the articulation of the said elements.
In a variant embodiment, the clamp comprises at least two elements
REFERENCES:
patent: 2784534 (1957-03-01), Townsend et al.
patent: 3222825 (1965-12-01), Seidel
patent: 4463635 (1984-08-01), Hafla et al.
patent: 4650237 (1987-03-01), Lessway
Bastin Jacques
Rouyer Louis
Createc Rollers
Rose Robert A.
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