Patent ID: 7252466
Filing Date: 2007-08-07
Classification: B23Q,G05B,Y10T

Abstract:
1. A tool position referencing apparatus for a machine having a powered spindle for holding a work-piece treating tool which has a proximal end and a distal end, and for activating the tool on a vertical axis, the apparatus comprising: a base for fixing to a table on the machine; a first pedestal mounted to said base for vertical movement relative to said base, and supported at a rest position by a resilient supporter; a second pedestal mounted to said base for vertical movement relative to said base, and supported at a rest position by a resilient supporter; a first sensor associated with said first pedestal and operable in response to vertical movement of said first pedestal downward from said rest position of said first pedestal; a second sensor associated with said second pedestal and operable in response to vertical movement of said second pedestal downward from said rest position of said second pedestal; a top on said first pedestal made of a compliant material such that, when the tool distal end is moving downward, said top is compliant in response to impact by said distal end against said compliant top, to operate said first sensor and to avoid damage to said tool distal end; and a top on said second pedestal made of a non-compliant material such that, when the tool distal end is moving downward, said second pedestal top is non-compliant in response to impact by said distal end against said non-compliant top, to operate said second sensor with greater accuracy than said first sensor operation.