Selective ribbon-handling mechanism for carbon and fabric ribbons

Claim 1

Ribbon selection and feeding control mechanism for a poweroperated typewriter including a carbon ribbon vibrator, means including a first drive arm connected to elevate said carbon ribbon vibrator, a fabric ribbon vibrator, means including a second drive arm connected to elevate said fabric ribbon vibrator, a carbon ribbon feed mechanism, and a fabric ribbon feed mechanism, a universal member operable incident to each typing action having a drive pin, each of said first and second drive arms having an elongated slot in one end thereof for receiving said drive pin and a detent in the upper portion of each slot for engaging said drive pin, springs urging said first and second drive arms toward engagement with said drive pin, first and second cam follower means in contact with the ends of said first and second drive arms and movable to position said drive arms into and out of engagement with said drive pin thereby, incident to movement of said universal member, to elevate neither or one of said carbon ribbon and fabric ribbon vibrators, drive means cyclically operable in response to movement of said universal member and selectively movable from a nondriving position to positions for driving engagement with said fabric ribbon and said carbon ribbon feed mechanisms, third cam follower means selectively movable to position said drive means to one of its said positions, and a single control wheel having first, second and third camming surfaces for acting on said first, second and third cam follower means.