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公开(公告)号：US4806030A
公开(公告)日：1989-02-21
申请号：US132254
申请日：1987-12-14
摘要： The correction device is applied to an electronic typewriter with a daisywheel and comprising an electric selector motor which selectively rotates the character-carrying daisywheel in the clockwise and the anti-clockwise directions for selecting the characters to be typed and/or corrected, a carrier for a correcting ribbon and a control member for lifting the carrier and permitting correction of the typed characters. A small correcting solenoid can be activated to couple the control member of the correcting ribbon to the selector motor. The control unit controls the motor and the solenoid in such a way that the selector motor can also actuate the control member in each correction cycle for positioning the correcting ribbon in front of the typing point. In the illustrated form, the solenoid unlatches a lever which drops to bring the control member into mesh with a gear on the motor shaft. The control gear is eccentrically mounted on the lever and a first 180.degree. revolution, corresponding to 360.degree. revolution of the daisywheel raises the lever and carrier to correcting ribbon height which a subsequent 180.degree. rotation drops the carrier back to typing ribbon height with the lever latched by the solenoid armature.
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公开(公告)号：US5034573A
公开(公告)日：1991-07-23
申请号：US535486
申请日：1990-06-11
IPC分类号： H01H13/52 , H01H13/70 , H01H13/705
CPC分类号： H01H13/705 , H01H2213/002 , H01H2215/004 , H01H2221/026 , H01H2233/018
摘要： The contact-type keyboard comprises a plurality of keys which are movable from a rest position to an operative position and which each have a sleeve capable of being accommodated in a tube provided on the upper part of a dome portion of elastomeric material. Each dome portion projects from a mat and, below the tube, comprises an internal circular ring provided with a movable conductive portion for short-circuiting a corresponding fixed conductor of a printed circuit which in turn is carried by a stop plate of insulating material. Each sleeve is of such a length as to pass internally by way of an upper opening through the dome portion, to engage a through hole in the plate to project downwardly beyond the plate and comprises a seat capable of accommodating a corresponding pin of a support frame structure so as to guide the respective key from the rest position to the operative position and vice-versa. The support frame structure is positioned below the stop plate at a predetermined spacing such that it does not interfere with the end of the sleeve when the respective key is in the operative position. The key is in turn restrained to the plate by means of a lateral appendix which is freely accommodated by a seat in the plate and provided with a hook portion which is retained by the plate.
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