Cutter with laser generator that irradiates cutting position on workpiece to facilitate alignment of blade with cutting position

1. A laser unit to be attached to a cutter including a base for supporting a workpiece; a holder supported on the base portion; and a cutter blade portion adapted for supporting a circular saw blade that cuts the workpiece, the cutter blade portion being supported on the holder so as to be movable between an upper position and a lower position, the cutter blade portion being closer to the base in the lower position than in the upper position; the circular saw blade having a rotation axis and a blade edge in a circumferential direction of the circular saw blade, the blade edge having a width in a direction of the rotation axis, said width being bounded by two parallel planes of the circular saw blade; the laser unit comprising:

a laser generator that irradiates laser light to be shown onto a position to be cut on the workpiece, the laser generator having a first side that extends in a cross-direction of the laser light;

a laser generator support member supporting the laser generator and attached to one of the holder and the cutter blade portion, the laser generator support member having an abutment surface that extends in a direction of the rotation axis and is abutted to the first side of the laser generator;

a screw member supported to the laser generator support member for moving the laser generator in a direction of the rotation axis of the circular saw blade;

a first resilient member interposed between the laser generator support member and the laser generator for urging the laser generator in a direction of an axis of the screw member; and

a second resilient member for urging the laser generator to the abutment surface.

2. The laser unit as claimed in claim 1 , wherein the screw member screwingly engages the laser generator.

3. The laser unit as claimed in claim 1 , wherein the screw member screwingly engages the laser generator support member and abuts the laser generator.

4. The laser unit as claimed in claim 1 , wherein the first side of the laser generator is disposed on a side opposite to that from which laser light is irradiated.

5. The laser unit as claimed in claim 1 , in combination with the cutter.

6. A laser unit for use with a cutter including a base portion for supporting a workpiece, a holder supported on the base portion, a cutter blade portion for supporting a circular saw blade that cuts the workpiece, the cutter blade portion being supported on the holder so as to be pivotally movable between an upper position and a lower position, the cutter blade portion being closer to the base portion in the lower position than in the upper position, the circular saw blade having a rotation axis and a blade edge in a circumferential direction of the circular saw blade, the blade edge having a width in a direction of the rotation axis, said width being bounded by two parallel planes of the circular saw blade; wherein the laser unit comprises:

a laser generator for emitting laser light, the laser generator having a first side, a second side, and a third side opposite to the second side;

a laser generator support member to be attached to one of the holder and the cutter blade portion and supporting the laser generator within a housing comprising lower and upper walls, first and second side walls, the laser generator support member having an abutment surface that extends in a direction of the rotation axis and is abutted to the first side of the laser generator;

a screw member supported to the laser generator support member for moving the laser generator in a direction of the rotation axis and perpendicularly to the plane of the circular saw blade;

a first resilient member interposed between the laser generator support member and the laser generator for urging the laser generator in a direction of an axis of the screw member;

a second resilient member for urging the laser generator to the abutment surface; and

a third resilient member disposed between the laser generator and the upper wall of the housing of the laser generator support member.

7. The laser unit as defined in claim 6 which further comprises second means provided to at least one of the first and second side walls to restrict an amount of movement of the laser generator within the housing in the longitudinal direction of the rotation axis of the saw blade.

8. The laser unit as defined in claim 7 , wherein the second means comprises:

a first stop member provided to the first side wall and movable in the longitudinal direction of the rotation axis and a second stop member provided to the second wall and movable in the longitudinal direction of the rotation axis for restricting the amount of movement of the laser generator within the housing of the laser generator support member.

9. The laser unit as claimed in claim 6 , wherein the screw member screwingly engages the laser generator.

10. The laser unit as claimed in claim 6 , wherein the screw member screwingly engages the laser generator support member and abuts the laser generator.

11. The laser unit as claimed in claim 6 , wherein the first side of the laser generator is disposed on a side opposite to that from which laser light is irradiated.

12. The laser unit as claimed in claim 6 , in combination with the cutter.