Printer

Claim 1

A printer having a moving mechanism for intermittently moving a print head mounted on a carriage movable along a platen between a print position wherein the head is pressed against the platen and a non-print position wherein the head is moved away from the platen, wherein an improved head moving mechanism comprises: a drive source providing a rotational output; a first connection gear driven in rotation by the output of said drive source; a second connection gear disposed coaially in parallel with the first connection gear and being rotatable independently of the first connection gear; a cam gear in mesh with the second connection gear and connected coaxially with an intermittent gear which is rotatable in parallel with the cam gear, said intermittent gear being engageable at a predetermined rotational position with said first connection gear to provide a driving output to said moving mechanism upon rotation of said cam gear to the predetermined position by said second connection gear; a timing gear movable to from a non-engaged position to an engaged position wherein it engages in mesh with both said first and second connection gears together, wherein said second connection gear is driven by said timing gear to rotate by the output of the drive source rotating said first connection gear meshing with said timing gear, said cam gear is rotated by the second connection gear, said intermittent gear is rotated with the cam gear to the predetermined rotational position to engage the first connection gear, and said driving output of the intermittent gear engaged with the first connection gear is thereby provided to the moving mechanism; and moving means for controllable moving said timing gear from the non-engaged position to the engaged position to the engage position when it is desired to drive said moving mechanism.