Printing head feeding mechanism for printers

Claim 2

A printing head holder feeding mechanism for printers, comprising: an operating gear, a first cam member formed on said operating gear, a crank lever engaged with said first cam member and arranged to complete one to-and-fro motion by means of one rotation of said operating gear, an intermediate pulley rotatably mounted on one end of said crank lever, a pair of pulleys positioned at both sides of said intermediate pulley leaving a space between each other, a printing head holder movable between said pair of pulleys, a rope having an intermediate portion connected to said printing head holder and having extending portions respectively extended from said intermediate portion in the opposite direction and applied between each of said pair of pulleys and said intermediate pulley and further having a respective end of said extending portions held in fixed condition, one of said extending portions being shaped in S-shape and the other being shaped in reverse S-shape, a printing head connected to said rope and movable between said pair of Pulleys, and a rail slidably supporting said printing head for linear movement of said printing head.

Claim 3

A printing head feeding mechanism for printers, comprising: an operating gear, a first cam member formed on said operating gear, a crank lever engaged with said first cam member and arranged to complete one to-and-fro motion by means of one rotation of said operating gear, an intermediate pulley rotatably mounted on one end of said crank lever, a pair of pulleys positioned at both sides of said intermediate pulley leaving a space between each other, a rope applied between said pair of pulleys and also applied in S-shape between said intermediate pulley and each of said pair of pulleys, both ends of said rope being held in fixed condition, a printing head connected to said rope and movable between said pair of pulleys, and a rail slidably supporting said printing head for linear movement of said printing head, a rotatable supporting lever fixed to said rail, a shaft engaged to said supporting lever, a roller rotatably mounted on said shaft, and a second cam member formed on said operating gear and having two different kinds of cam surfaces engageable with said roller, said printing head being held in its printing position only during half a rotation of said operating gear.

Claim 4

A printing head feeding mechanism for printers, comprising: an operating gear, a first cam member formed on said operating gear, a crank lever engaged with said first cam member and arranged to complete one to-and-fro motion by means of one rotation of said operating gear, an intermediate pulley rotatably mounted on one end of said crank lever, a pair of pulleys positioned at both sides of said intermediate pulley leaving a space between each other, a rope applied between said pair of pulleys and also applied in S-shape between said intermediate pulley and each of said pair of pulleys, both ends of said rope being held in fixed condition, a printing head connected to said rope and movable between said pair of pulleys, and a rail slidably supporting said printing head for linear movement of said printing head, a rotatable supporting lever fixed to said rail, a shaft engaged to said supporting lever, a roller rotatably mounted on said shaft, and a second cam member formed on said operating gear and having two different kinds of cam surfaces engageable with said roller, said printing head being held in its printing position only during half a rotation of said operating gear.