| 摘要 |
<p>@ The typing and erasing device is applied to a printer of the daisywheel type and comprises a carrier (84, 86) for a typing ribbon (32) having a plurality of transverse tracks which can be selected for the printing operation and a carrier for an erasing ribbon which is disposed parallel to but at a different height from the typing ribbon. The typing ribbon is contained in a cartridge on which two typing ribbon carrier arms (41) are pivoted. The carriers oscillate vertically in order to render visible the typed characters and for the operations of typing or erasing the characters at the typing point (12). A cam (81) for actuating the typing ribbon, which is controlled by a control shaft (56) selectively and successively positions the various tracks of the typing ribbon, and a second actuating cam (61) positions the correction ribbon independently of the position of the typing ribbon by way of a cam-follower pin (126) and a lever (127) which actuates the correction ribbon carrier and also the correction ribbon feed mechanism. The second cam (61) has interconnected tracks (122, 123, 124) such that selection of the correction ribbon is effected only in response to one direction of movement of the control shaft. The second cam (61) also actuates a lever (63) of the typing ribbon-feed mechanism. The cam (81) is three-lobed and rotates 120° for each complete rotation of the control shaft (56) and second cam (61) fixed thereto.</p> |
