Type carrier arrangement for roller printing

A printing device comprising;

• in combination a rotary type drum, at least one type carrier rotatable with the drum and rotatable on the drum, multiple circumferentially spaced type sections thereon each adapted in a respective rotated position of one type carrier to carry out a printing operation in one rotated position of the drum, an arcuate stationary gear segment concentric with the drum in a plane spaced axially from the plane of the type sections, a gear connected to said type carrier means in the plane of said gear segment and having one tooth missing, stationary cam means having a cam surface concentric with said drum in a further axial plane and a cam element connected to said type carrier axially aligned with the leading side of the missing tooth space of said gear engaging said cam surface and positively holding said type carrier in a predetermined rotated idle position on the type drum when the type drum is outside the range of said one rotated position, a control tooth connected to the type carrier in axial alignment with the missing tooth space and in a still further axial plane, circumferentially spaced pawls including a pawl for each type section on the type carrier adjacent the path of said control tooth selectively engageable therewith to rotate said type carrier on the type drum to cause the gear connected therewith to mesh with said gear segment and be rotated thereby during rotation of said drum, said stationary cam means having a cam element receiving space therein for each pawl to permit rotation of said gear when the respective pawl is moved into engagement with said control tooth, the number of tooth spaces in said gear segment being equal to what is required to rotate said type carrier to the idle position thereof when the type carrier has rotated the minimum amount on said type drum to present a type section to printing position.