Device for detecting a leading edge of a recording paper
AssigneeFuji Photo Film Co., Ltd.
InventorAkimasa Kaya
Life of this patent
Estimating the term…
Abstract
A separator abuts on a leading edge of a recording paper to separate it from a periphery of a paper roll when the paper roll is rotated forward in a paper feeding direction. The separator is attached to a supporting arm, which is urged by a spring so as to move the separator in accordance with a change of a diameter of the paper roll. The separator is provided with a vibration detecting sensor. While the paper roll is rotated backward in a winding direction, the vibration detecting sensor outputs a signal to a controller. This signal has a level corresponding to a scale of vibration. The controller detects the leading edge from the signal level when a head portion of the separator has overleapt the leading edge of the recording paper.
Claims19
A device for detecting a leading edge of a strip of a recording paper having a form of a paper roll, said leading edge existing on a periphery of said paper roll before paper feed of said recording paper, said leading-edge detecting device comprising:
- a driving member for rotating said paper roll in a wind direction before said recording paper is fed by rotating said paper roll in an unwind direction;
- an abutting member for contacting with the periphery of said paper roll, said abutting member vibrating when said leading edge has passed under the rotation of said paper roll in the wind direction;
- a vibration detecting sensor for detecting a vibration of said abutting member;
- and
- judgement means for judging a moment that said leading edge has passed said abutting member under the rotation of said paper roll in the wind direction, on the basis of a change of a signal outputted from said vibration detecting sensor.
Dependencies are inferred from the claim text.