Abstract: A shuttle mechanism of a printer apparatus wherein a balance shuttle unit is arranged on the opposite side of the print head in a print shuttle unit, for instance, on the under side of said print shuttle unit, so that the center of the gravity of the print shuttle unit is made to become close to that of the balance shuttle unit. Common components such as the magnet, yoke, guide member may be employed in both the shuttle units.

Abstract: A shuttle apparatus for a printer having a print shuttle unit driven to reciprocate. The print shuttle unit includes a print shuttle provided with a print head and movable along a guide device. A row of permanent magnets are attached to the print shuttle, and a row of electromagnetic coils are secured to a stationary member so as to face the permanent magnets across a gap. The coils and the permanent magnets constitute a linear motor for reciprocating the print shuttle unit along the guide device. A balance shuttle unit having approximately the same weight as that of the print shuttle unit is disposed so that the center of gravity of the balance shuttle unit travels on a line approximately the same as the line of travel of the center of gravity of the print shuttle unit. The balance shuttle unit is driven to reciprocate in linked relation to the print shuttle unit in parallel but reverse in direction to the print shuttle unit.