Typewriting machines – Sheet or web – Including friction-feed means
Patent
1984-02-23
1986-08-26
Burr, Edgar S.
Typewriting machines
Sheet or web
Including friction-feed means
400637, B41J 13054
Patent
active
046079688
ABSTRACT:
The device comprises two or more cover plate members (14), whose lengths are submultiples of the lengths of a range of platen rollers (12) and such that two or more plate members disposed in side-by-side relationship cover the entire length of the platen roller. Each plate member (14) comprises a lower guide portion (16) of part-cylindrical shape and two wall portions (17, 18) which are substantially planar and set at different angles of inclination, being connected to the lower guide portion in such a way to lead in a sheet of paper (19) towards the guide portion. Each plate member (14) is pivotally mounted on a control shaft (22) which is parallel to the axis of the roller (12) and capable of preventing transverse movements of the plate member with respect to the roller, and carries the usual paper pressing rollers (34, 36) which are disposed in two parallel rows. A leaf spring (26) co-operates with a lug (24) on the plate member (14) to hold the paper pressing rollers pressed against the platen roller. The control shaft comprises opening cams (57) arranged to co-operate with the leaf springs to disengage same from the respective lugs and to permit the respective plate members to drop away from the platen roller (12), whereby the paper pressing rollers (34, 36) are disengaged from the platen roller to assist in introducing the sheet of paper.
REFERENCES:
patent: 1145017 (1915-07-01), Hess
patent: 1185318 (1916-05-01), Hess
patent: 2848092 (1958-08-01), Ostholm et al.
patent: 3267850 (1966-08-01), Ryan et al.
patent: 4469454 (1984-09-01), Crean
IBM Technical Disclosure Bulletin, by Ramirez et al., "Platen Backup Rollers", vol. 25, No. 1, Jun. 1982, pp. 202-203.
Burr Edgar S.
Ing. C. Olivetti & C. S.p.A.
Weresh John A.
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