Electric heating – Metal heating – Cutting or disintegrating
Reexamination Certificate
2000-03-10
2001-12-11
Evans, Geoffrey S. (Department: 1725)
Electric heating
Metal heating
Cutting or disintegrating
C076S037000, C219S069200
Reexamination Certificate
active
06329624
ABSTRACT:
The invention relates to a method of controlling a machine provided for machining workpieces which have cutting teeth, especially saw blades, comprising
a saddle which is displaceable along a spindle axis and transversely thereof under numerical control,
a tool spindle which is supported on the saddle so as to be rotatable about the spindle axis and adapted to be equipped with a disc-shaped tool for machining a workpiece, and
a workpiece slide which is displaceable along a workpiece slide guide means under numerical control and carries a workpiece support,
the tool spindle being adapted to be driven by a motor at variable rotational speed, and
the tool being an electrically conductive member of an electric circuit which controls the machine and is closed through the workpiece when the latter is touched by the tool.
Such a method is known from U.S. Pat. No. 4,963,710. In that case the advance of the tool with respect to the workpiece is made dependent on parameters of a current flowing between the two.
It is the object of the invention to improve such a method in such a way that the numerically controlled possibilities of movement (axes of movement), for which the machine is equipped anyway, will permit the dimensions required for recognizing and machining workpieces having cutting teeth, especially circular saw blades, to be picked up in a manner suitable for the numerical control of the machine, without presenting a risk of a tooth tip to be sensed becoming damaged.
Starting from a method of the kind defined, the object is met, in accordance with the invention, by the fact that, for sensing the workpiece by means of the tool, the tool spindle is driven at a rotational measuring speed which is reduced considerably as compared to a rotational operating speed normally used for machining the workpiece. The rotational measuring speed preferably lies in the order of magnitude between one and ten per cent of the rotational operating speed.
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patent: 4750387 (1988-06-01), Swiger
patent: 4947015 (1990-08-01), Lach
patent: 4963710 (1990-10-01), Lach
patent: 6109137 (2000-08-01), Lenard et al.
patent: 196 30 057 C1 (1997-09-01), None
Bailer Norbert
Lenard Peter
Schmucker Rudi
Browning Clifford W.
Evans Geoffrey S.
Vollmer Werke Maschinenfabrik GmbH
Woodard Emhardt Naughton Moriarty & McNett
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