Electronic typewriter with a device for zero positioning of a ro

Details Electronic typewriter with a device for zero positioning of a ro Electronic typewriter with a device for zero positioning of a ro

1985-11-08

1986-08-12

Burr, Edgar S.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Including type-faces movable relative to type-face-carrier

400185, 400187, 400212, 400697, B41J 130

Patent

active

046053247

ABSTRACT:
The electronic typewriter is of the `daisywheel` type and comprises a microprocessor, a stepping selector motor controlled by a position register for positioning the daisywheel 28, and a support frame for a correction ribbon. The support frame is arranged to oscillate from a down position for viewing purposes to an up position for the correction operation. A tab (104) moves up and down with the frame. The daisywheel rotates together with a sleeve member 97 provided with a stop seat 98. The tab (104), in the up position, urges a tooth (99) on a lever (101) into interference with the sleeve member (97), via a resiliently yielding blade (107) of the lever (101). During the correction cycles, rotary movement of the daisywheel (28) takes place when the support frame and hence the tab (104) is in its own position and thus without any obstacle. In the initialization phase, the microprocessor raises the support frame and tab (104) in advance of a command for complete rotation of the daisywheel (28). This causes the tooth (99) to engage into the seat (98) and stops the daisywheel in its zero position. The position register is then loaded with a code corresponding to the zero position of the daisywheel, thereby being synchronized to the angular position thereof.

REFERENCES:
patent: 4264220 (1981-04-01), Okcuoglu
patent: 4299502 (1981-11-01), Harre
patent: 4472073 (1984-09-01), Valle et al.
R. F. Springer, "Printwheel Removal and Ribbon Cartridge Lifting Mechanism"; IBM Tech. Disc. Bull., vol. 23, No. 4, p. 1516; Sep. 1980.
J. R. Booth, "Means and Method for Homing Daisy Wheel Printers"; IBM Tech. Disc. Bull.; vol. 24, No. 12, pp. 6536-6537; May 1982.

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