Stepper for slow motion disc recorder

In a disc recorder having a rotating recording disc;

• a transducer assembly including a transducer cooperable with said disc;
• carriage means for mounting said transducer assembly;
• an idler pulley and a drive pulley, one of said pulleys being inward from the periphery of said disc and the other pulley being positioned outward of said disc from said one pulley;
• carriage belt means attached to said carriage means and to said drive pulley and extending around said idler pulley, the portion of said belt means attached to said carriage means being supported along a path extending parallel to said disc;
• and stepping motor means connected to rotate said drive pulley such that said transducer is moved radially of said rotating disc;
• the improvement in which said carriage belt means comprises:
• first and second carriage belts each attached at one end to said carriage means and attached at their other end to said drive pulley and,
• a third carriage belt attached to said carriage means, extending in the opposite direction from said first and second belts, and attached to said drive pulley intermediate said first and second carriage belts, whereby the axis of rotation of said idler pulley is parallel to the axis of rotation of said drive pulley and said carriage belt means is operable with reduced binding and friction.