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US 4,641,557 AGranted
Electronically controlled power saw
AssigneeEmerson Electric Co.
InventorsRobert E. Steiner, Karmen D. Cox, Daniel A. Terpstra, James J. Metzger, Jr., Steven H. Plume
Life of this patent
Estimating the term…
Abstract
A power saw includes a motor for driving a saw blade or the like around its rotational axis to cut a workpiece. The position of the rotational axis with respect to a reference position is sensed and a manually operated keyboard is provided for entering a desired change in the position of the rotational axis. Positioning motors are provided along with circuitry which is responsive to the entering of a desired change in the position of the rotational axis of the saw blade for moving the axis correspondingly.
Claims54
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpice;
- means for sensing the elevation of the rotational axis with respect to a reference elevation;
- manually operable means for entering a desired final elevation of the rotational axis;
- and
- means responsive to the entering of a desired final elevation of the rotational axis for moving said axis to said elevation, said moving means including a positioning motor which when energized changes the elevation of the rotational axis;
- wherein the manually operable means further includes means for requesting a continuing change in elevation, the moving means being responsive to said request to continue changing the elevation within preset limits until the request ceases or the preset limits are reached.
4 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing the elevation of the rotational axis with respect to a reference elevation;
- manually operable means for entering a desired final elevation of the rotational axis;
- and
- means responsive to the entering of a desired final elevation of the rotational axis for moving said axis to said elevation, said moving means including a positioning motor which when energized changes the elevation of the rotational axis;
- wherein the moving means is disabled from accepting the entering of a desired final elevation when the driving means is driving the saw blade around its rotational axis.
4 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing the elevation of the rotational axis with respect to a reference elevation;
- manually operable means for entering a desired final elevation of the rotational axis;
- and
- means responsive to the entering of a desired final elevation of the rotational axis for moving said axis to said elevation, said moving means including a positioning motor which when energized changes the elevation of the rotational axis;
- the final approach to the desired final elevation always occurring from the same direction.
4 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sening the elevation of the rotational axis with respect to a reference elevation;
- manually operable means for entering a desired final elevation of the rotational axis;
- means responsive to the entering of a desired final elevation of the rotational axis for moving said axis to said elevation, said moving means including a positioning motor which when energized changes the elevation of the rotational axis;
- means for setting the reference elevation, said moving means including means for storing the reference elevation;
- and
- master switch means for controlling the supplying of power to the driving means and for signalling that the manually operable entering means should be enabled, the moving means being responsive to one state of the master switch to enable the manually operable entering means, and means for supplying power to the reference elevation storing means even when the driving means is not being supplied with power and the manually operable entering means is not enabled so that the reference elevation is retained even while the manually operable means is inoperative.
5 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing the elevation of the rotational axis with respect to a reference elevation;
- manually operable means for entering a desired final elevation of the rotational axis;
- means responsive to the entering of a desired final elevation of the rotational axis for moving said axis to said elevation, said moving means including a positioning motor which when energized changes the elevation of the rotational axis;
- means responsive to the elevation sensing means for storing the actual elevation of the rotational axis;
- and
- means for supplying power to the actual elevation storing means independently of whether the manually operable entering means is enabled.
5 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing the elevation of the rotational axis with respect to a reference elevation;
- manually operable means for entering a desired final elevation of the rotational axis;
- means responsive to the entering of a desired final elevation of the rotational axis for moving said axis to said elevation, said moving means including a positioning motor which when energized changes the elevation of the rotational axis;
- and
- means for displaying to the saw operator the fact that a jam has occurred during the moving of the rotational axis by the moving means;
- wherein the displaying means also includes means for displaying to the operator the elevation at which the jam occurred.
5 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing the elevation of the rotational axis with respect to a reference elevation;
- manually operable means for entering a desired final elevation of the rotational axis;
- means responsive to the entering of a desired final elevation of the rotational axis for moving said axis to said elevation, said moving means including a positioning motor which when energized changes the elevation of the rotational axis;
- and
- wherein the moving means is responsive to the fact that a jam has occurred during the moving of the rotational axis downwardly to raise the rotational axis a preset amount to free any workpiece which might be jammed beneath the descending saw blade.
4 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing a position of the rotational axis with respect to a reference elevation;
- manually operable means for entering a desired final position of the rotational axis;
- means responsive to the entering of a desired final position of the rotational axis for moving said axis to said position, said moving means including a positioning motor which when energized changes the elevation of the rotational axis;
- and
- manually operable calibration means for setting a zero position for the rotational axis;
- wherein the moving means includes means for storing the zero position for the rotational axis, further including means for supplying power to the storing means indpendently of whether power is supplied to the driving means and of whether the manually operable entering means is enabled.
5 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing the bevel angle of the rotational axis with respect to a reference bevel angle;
- manually operable means for entering a deisred final bevel angle of the rotational axis;
- and
- means responsive to the entering of a desired final bevel angle of the rotational axis for moving sais axis to said bevel angle, said moving means including a positioning motor which when energized changes the bevel angle of the rotational axis;
- wherein the manually operable means includes means for requesting a continuing change in bevel angle, the moving means being responsive to said request to continue changing the bevel angle within preset limits until the request ceases or the preset limits are reached.
4 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing the bevel angle of the rotational axis with respect to a reference bevel angle;
- manually operable means for entering a desired final bevel angle of the rotational axis;
- and
- means responsive to the entering of a desired final bevel angle of the rotational axis for moving said axis to said bevel angle, said moving means including a positioning motor which when energized changes the bevel angle of the rotational axis;
- wherein the moving means is disabled from accepting the entering of a desired final bevel angle when the driving means is driving the saw blade around its rotational axis.
4 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing the bevel angle of the rotational axis with respect to a reference bevel angle;
- manually operable means for entering a desired final bevel angle of the rotational axis;
- and
- means responsive to the entering of a desired final bevel angle of the rotational axis for moving said axis to said bevel angle, said moving means including a positioning motor which when energized changes the bevel angle of the rotational axis;
- the final approach to the desired final bevel angle always occurring from the same direction.
4 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing the bevel angle of the rotational axis with respect to a reference bevel angle;
- manually operable means for entering a desired final bevel angle of the rotational axis;
- means responsive to the entering of a desired final bevel angle of the rotational axis for moving said axis to said bevel angle, said moving means including a positioning motor which when energized changes the bevel angle of the rotational axis;
- wherein the moving means includes means responsive to the position sensing means for storing the actual bevel angle of the rotational axis;
- and
- means for supplying power to the actual bevel angle storing means independently of whether the manually operable entering means is enabled.
5 more elements
A bench radial arm power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing a position of the rotational axis with respect to a reference position;
- manually operable means for entering a desired final position of the rotational axis;
- means responsive to the entering of a desired final position of the rotational axis for moving said axis to said position, said moving means including a positioning motor which when energized changes the position of the rotational axis;
- means for manually changing the miter angle of the saw;
- means for sensing the miter angle;
- means for adjusting the zero angle with respect to which the miter angle is measured;
- means for storing the zero angle independently of whether the manually operable entering means is enabled;
- and
- display means for warning the saw operator that no zero angle is stored in the storing means.
8 more elements
A bench radial arm power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing a position of the rotational axis with respect to a reference position;
- manually operable means for entering a desired final position of the rotational axis;
- means responsive to the entering of a desired final position of the rotational axis for moving sais axis to said position, said moving means including a positioning motor which when energized changes the position of the rotational axis;
- means for manually changing the miter angle;
- and
- means for sensing the miter angle;
- wherein the sensing means includes means for generating at least two separate waveforms as the miter angle is changed, further including logic means for decoding the waveforms to determine the miter angle.
6 more elements
A bench radial arm power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing a position of the rotational axis with respect to a reference position;
- manually operable means for entering a desired final position of the rotational axis;
- means responsive to the entering of a desired final position of the rotational axis for moving said axis to said position, said moving means including a positioning motor which when energized changes the position of the rotational axis;
- means for manually changing the bevel angle;
- means for sensing the bevel angle;
- means for adjusting the zero angle with respect to which the bevel angle is measured;
- means for storing the zero angle independently of whether the manually operable entering means is enabled;
- and
- display means for warning the saw operator that no zero angle is stored in the storing means.
8 more elements
A bench radial arm power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing a position of the rotational axis with respect to a reference position;
- manually operable means for entering a desired final position of the rotational axis;
- means responsive to the entering of a desired final position of the rotational axis for moving said axis to said position, said moving means including a positioning motor which when energized changes the position of the rotational axis;
- means for manually changing the bevel angle;
- and
- means for sensing the bevel angle;
- wherein the sensing means includes means for generating at least two separate waveforms as the bevel angle is changed, further including logic means for decoding the waveforms to determine the bevel angle.
6 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing a position of the rotational axis with respect to a reference position;
- manually operable means for entering a desired final position of the rotational axis;
- means responsive to the entering of a desired final position of the rotational axis for moving said axis to said position, said moving means including a positioning motor which when energized changes the position of the rotational axis;
- and
- means for setting the reference position, means for storing that reference position, and means for rendering the manually operable entering means inoperative without affecting the reference position.
4 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing a position of the rotational axis with respect to a reference position;
- manually operable means for entering a desired final position of the rotational axis;
- and
- means responsive to the entering of a desired final position of the rotational axis for moving said axis to said position, said moving means including a positioning motor which when energized changes the position of the rotational axis;
- wherein the moving means includes means for substantially containuously monitoring the sensing means and further including means for rendering the manually operable entering means inoperative without affecting the monitoring of the sensing means.
4 more elements
A bench power saw comprising:
- a table for supporting a workpiece;
- means adapted for driving a saw blade or the like around its rotational axis to cut the workpiece;
- means for sensing a position of the rotational axis with respect to a reference position;
- manually operable means for entering a desired final position of the rotational axis;
- and
- means responsive to the entering of a desired final position of the rotational axis for moving said axis to said position, said moving means including a positioning motor which when energized changes the position of the rotational axis;
- wherein the sensing means senses rotations of the positioning motor and the moving means includes means for compensating for the nonlinearity in movement of the axis with respect to rotations of the positioning motor.
4 more elements
Dependencies are inferred from the claim text.