| 摘要 |
A roller-band device which utilizes a roller with a flexible band encircling it. The band has two sections which are electrically insulated from each other and the roller is nonconductive but has one or more conductors extending axially along its surface and disposed so that, in certain positions of the roller and band, the two sections of the band are bridged and an electrical circuit is completed therebetween and, in other positions of the roller, the electrical circuit is broken between the two sections of the band. One section of the band may include a plurality of legs, each electrically insulated from each other, and with each of the legs being bridged by the conductor means in different positions of the roller and band. In another embodiment the conductor means is arranged so that a circuit is completed to all of the legs simultaneously upon the roller and band moving to a predetermined position. A keyboard arrangement is disclosed wherein a plurality of switches of this type are utilized together, each with a different combination of legs connected into the output circuit to provide a coded signal to a device such as used in computer periphery equipment. Also disclosed is a roller-band device of the type described above having a unique actuating means, especially useful in connection with a keyboard switch, which includes a force-amplifying connection between the manual actuator and the roller and band and which provides a breakaway action as the manual actuator is operated. |
