Wire deflector and wire saw

A pivotable wire deflector for a saw wire of a wire saw, the pivotable wire deflector comprising:

• a deflection roller having a running groove for guiding the saw wire of the wire saw;
• a pivot joint having a rotary bearing block with a cylindrical receptacle and a tube arranged so as to be rotatable in the cylindrical receptacle, wherein the deflection roller is attached to the rotary bearing block or the tube;
• a clamp fastened to the rotary bearing block and enclosing the tube;
• a lever movable manually between a first position and a second position;
• and
• a clamping and spreading mechanism, the clamping and spreading mechanism in response to the lever, in the first position, reduces an inner circumference of the clamp to a first circumferential length and, in the second position, increases the inner circumference of the clamp to a second circumferential length, wherein the first circumferential length is smaller than the second circumferential length, and the clamp bears with the first circumferential length against the tube with a contact surface;
• the clamping and spreading mechanism having a shaft oriented along a longitudinal axis of the tube and having an eccentric cam, a rotary bearing for the shaft, and a camway enclosing the cam, wherein either the rotary bearing of the shaft is attached to the movable end of the clamp and the camway is attached to the rotary bearing block, or the camway is attached to the movable end and the rotary bearing of the shaft is attached to the rotary bearing block.