Printhead drive system for serial printer

Details Printhead drive system for serial printer Printhead drive system for serial printer

1993-09-17

1995-11-07

Fuller, Benjamin R.

Recorders

Markers and/or driving means therefor

Stylus feature

346139B, 347 37, 400323, 400335, B41J 201, B41J 1914

Patent

active

054651077

ABSTRACT:
The printhead of an ink jet printer is mounted on a printhead carrier for reciprocal movement on a carrier guide rod above a record feed path. A bi-directional motor drives a drive belt attached to the carrier to thereby pull the printhead back and forth. The belt is attached to the carrier at two points which are spaced from the axis of the carrier guide rod, one point being above the axis and the other point being below the axis. The arrangement is such that any tilt of the printhead carrier in a vertical plane, resulting from a pulling force of the drive belt, is always in the same direction regardless of the direction in which the printhead carrier is pulled. This improves the accuracy of ink dot placement thereby giving better print quality. The drive belt is mounted on pulleys which are positioned such that there is an upward incline from each attachment point to a pulley. The carrier is provided with feet which ride in a groove in a carrier guide. When the belt is driven, an upward component of force is applied to the carrier at the point where the belt is attached to the carrier. This upward force tends to rotate the printhead carrier about the guide rod, thereby forcing the carrier feet into engagement with the groove in the carrier guide. This reduces the tendency of the carrier to rotate in a horizontal plane as a pulling force is applied to it.

REFERENCES:
patent: 4084681 (1978-04-01), Heinzl et al.
patent: 4525726 (1985-06-01), Mori
patent: 4668963 (1987-05-01), Tanabe et al.
patent: 4869609 (1989-09-01), Iwata
patent: 5098209 (1992-03-01), Gomoll et al.

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