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A printing apparatus including a plurality of drive coils for driving printing hammers arranged longitudinally in side-by-side relation at one side of a core of the U-shape. A first cooling fluid passageway is defined inside the core of the U-shape to allow a cooling fluid for cooling the drive coil

A printing apparatus including a plurality of drive coils for driving printing hammers arranged longitudinally in side-by-side relation at one side of a core of the U-shape. A first cooling fluid passageway is defined inside the core of the U-shape to allow a cooling fluid for cooling the drive coils to flow therethrough, and a second cooling fluid passageway is defined outside the core by a duct to allow the cooling fluid for cooling the drive coils to flow therethrough without escaping to the outside by diffusion. A current of cooling fluid is forcibly fed into these cooling fluid passageways by a fluid machine.

대표청구항 ▼

A printing apparatus comprising: a printing section including a substantially horizontally disposed core, a plurality of drive coils for driving printing hammers arranged longitudinally in a side-by-side relationship at one side of the core, said drive coils being arranged in a side-by-side relation

A printing apparatus comprising: a printing section including a substantially horizontally disposed core, a plurality of drive coils for driving printing hammers arranged longitudinally in a side-by-side relationship at one side of the core, said drive coils being arranged in a side-by-side relationship adjacent to and in contact with one another so as to form a block having a pair of opposite surfaces to be cooled; a support means for supporting the printing section; a first cooling fluid passageway defined between one side of said core and one of said pair of opposite surfaces of said drive coils to allow a cooling fluid for the drive coils to flow therethrough, said first cooling fluid passageway having a substantially constant cross-sectional area in a flow direction of a cooling fluid and extending substantially straight in a direction in which the drive coils are arranged; a second cooling fluid passageway defined between the other of said pair of opposite surfaces of said drive coils and a cover member to allow the cooling fluid for the drive coils to flow therethrough, said second cooling fluid passageway being substantially constant in cross-sectional area in a direction of the flow of the cooling fluid and substantially straight in a direction in which the drive coils are arranged; and at least one fluid machine for forcibly causing the cooling fluid to flow through said first cooling fluid passageway and said second cooling fluid passageway whereby the cooling fluid flows along said opposite surfaces to be cooled of the block of said drive coils.