Multi-strike ink ribbon feed control

Details Multi-strike ink ribbon feed control Multi-strike ink ribbon feed control

1992-12-21

1994-08-23

Burr, Edgar S.

Typewriting machines

Including interposed inking device for record-medium

Package for ribbon facilitating mounting of ribbon on...

400219, 400249, 400703, B41J 3528

Patent

active

053402235

ABSTRACT:
Means to control feeding of a multi-strike ink ribbon housed in a reversible cassette is disclosed. The cassette carries a magnetizable element and when the cassette is inserted in printing apparatus the element is located in operative alignment with a magnetic sensing device and with an electromagnet. Upon insertion of the cassette, the polarity of magnetization is sensed and provided the polarity is correct printing is enabled. If the polarity is incorrect printing is disabled. When the end of the ink ribbon is sensed, the electromagnet is energized to reverse the polarity of magnetization of the element so that when the cassette is removed and reinserted with reversed orientation, the correct polarity of magnetization is sensed and printing is enabled. A counter may be provided to limit the number of permitted reversals of the cassette.

REFERENCES:
patent: 4836698 (1989-06-01), Takagi et al.
patent: 4907902 (1990-03-01), Doi
patent: 4917515 (1990-04-01), Piller et al.
patent: 4948276 (1990-08-01), Haftmann et al.

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