Tool rest for machine tool

A tool rest for a machine tool, the tool rest comprising:

• a first rotary tool;
• a second rotary tool;
• a rotatably supported tool-rotating drive shaft whose rotation is transmitted to the first rotary tool and to the second rotary tool, the tool-rotating drive shaft having a key groove formed in the outer peripheral surface thereof;
• a first input portion consisting of a first gear wheel, the first input portion having a key that is received within the key groove of the tool-rotating drive shaft, the first input portion and the tool-rotating drive shaft being fixed to one another via the key and the key groove such that the first input portion is fixed from rotation relative to the tool-rotating drive shaft;
• a second input portion consisting of a second gear wheel and rotatably supported by the tool-rotating drive shaft;
• a first engaging portion corresponding to the first input portion and rotatably supported and adapted to be driven in rotation by the first input portion, the first engaging portion for engaging with a first engaged portion of the first rotary tool when a first prescribed angular phase is reached;
• a second engaging portion corresponding to the second input portion and rotatably supported and adapted to be driven in rotation by the second input portion, the second engaging portion for engaging with a second engaged portion of the second rotary tool when the prescribed angular phase is reached;
• and
• a fixing means, arranged inside the second input portion and attached to the tool-rotating drive shaft, the fixing means fixing the second input portion with respect to the tool-rotating drive shaft such that a phase of the second engaging portion is adjustable relative to the tool-rotating drive shaft, the phase of the second engaging portion being adjusted by shifting a circumferential position of the second input portion in a rotating direction relative to the tool-rotating drive shaft.