Roll paper printer

Abstract

A rolled sheet printer comprises a body unit and a closable cover unit mounted on the front face of a body unit closably to the front side. When the closable cover unit is opened, the front side of a rolled sheet storage part in a printer body is put into an opened condition to allow the replacement of the rolled sheet. A detecting protrusion of the rolled sheet detecting mechanism is protruded in the rolled sheet storage part. When the rolled sheet is running out, the position of its core hole lowers and the detecting protrusion is put into the core hole to detect that the rolled sheet is running out. When the closable cover unit is opened, a link lever is moved from a first position to a second position on the front side thereof and its abutting plate portion pushes the detecting protrusion therein to hold it in the condition being set out of the rolled sheet storage part. Thus, rolled sheet replacing work can be efficiently done without being disturbed by the detecting protrusion.

Description

technical field [0001] The present invention relates to a roll paper printer having a roll paper size detection device, the roll paper printer featuring an improvement enabling easy replacement of the roll paper. Background technique [0002] One type of roll paper printer has roll paper loaded such that the roll paper can simply be rolled on the bottom of the roll paper chamber. Roll paper generally has a long strip of recording paper wound into a roll around a hollow core with a hole in the center. Roll paper printers of this type also typically have roll paper size detection means for detecting the proximal end of the roll when a small amount of roll paper remains on the core. One type of roll paper size detection device has a rod inserted into a hole in a roll paper core. [0003] The lever is pressed against the round end (side) of the roll paper held by the push member at a predetermined height above the bottom of the roll paper chamber in the roll paper chamber. Wh...

AI Technical Summary

Problems solved by technology

However, providing a taper with a large angle on the detection rod causes a problem of lowered detection accuracy because it is more difficult to set a point where the detection rod is accurately inserted into the roll paper core when the roll paper is reduced to a predetermined remaining volume than with a detection rod that does not have a taper. many

The same problem occurs with the mechanism that uses the detection rod to separate from the outer circumference of the roll paper

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