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US 4,263,847 AGranted
Printing mechanism for dot matrix impact printers
AssigneeCitizen Watch Co., Ltd.
InventorsToshio Kurihara, Nagao Mizutani, Tsutomu Iesaka
Life of this patent
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AssigneeCitizen Watch Co., Ltd.
InventorsToshio Kurihara, Nagao Mizutani, Tsutomu Iesaka
Estimating the term…
A dot matrix impact printer of the type which has a platen having a helical projection, a plurality of hammers arranged in the axial direction of the platen to cross the helical projection, and means for feeding an ink to the periphery of the helical projection. The platen is rotated and the hammer strikes the helical projection interposing the recording paper, so that dot matrix printing may be performed. In order to prevent the contamination of the recording paper with the ink, there is provided a separating member of resilient material along the helical projection. The periphery of the separating member is slightly higher than the helical projection, so that the recording paper is separated from the helical projection. The separating member is compressed by impacting the hammer so that the ink may be transferred to the paper.
A printing mechanism for dot matrix impact printers comprising a platen, a helical separating member made of resilient material provided on the periphery of said platen, a helical disclosed portion of said platen disposed adjacent said helical separating member, the periphery of said helical separating member being higher than said helical disclosed portion, a plurality of hammers arranged in the axial direction of said platen, each of said hammers having a hammer head which is provided to cross said helical disclosed portion, means for feeding ink to the periphery of said helical disclosed portion, means for rotating said platen, and means for moving said hammers to said platen to compress said resilient separating member to perform the dot matrix impact printing.
Dependencies are inferred from the claim text.