发明授权
- 专利标题: Printer print head positioning apparatus and method
- 专利标题(中): 打印机打印头定位装置及方法
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申请号: US206998申请日: 1994-03-07
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公开(公告)号: US5488396A公开(公告)日: 1996-01-30
- 发明人: Edward F. Burke , Randy C. Karambelas
- 申请人: Edward F. Burke , Randy C. Karambelas
- 申请人地址: OR Wilsonville
- 专利权人: Tektronix, Inc.
- 当前专利权人: Tektronix, Inc.
- 当前专利权人地址: OR Wilsonville
- 主分类号: B41J25/308
- IPC分类号: B41J25/308 ; B41J19/20 ; B41J25/00 ; B41J25/304 ; B41J11/20
摘要:
A print head (216) positioner (260) includes a stepper motor (264) that is coupled by a substantially friction- and backlash-free taut metal band (266) to a lever arm (268) that imparts precise lateral motion to a positioning shaft (220) that is rigidly attached to the print head assembly. Each step of the stepper motor is translated by the lever arm into one pixel (0.085 millimeter) of lateral movement of the shaft. The exact amount of translation per step of the stepper motor is adjustable by an eccentrically mounted ball (272) that is minutely positionable (274) on the lever arm. The ball couples angular motion of the lever arm to lateral motion of the shaft such that adjusting the ball position on the lever arm provides a-variable scale factor adjustment that compensates for tolerance buildups and exact inter-nozzle spacing on the print head. The shaft is biased toward the ball by a spring (284). The shaft further allows the print head to swing away from a print media support, such as a drum (202), for maintenance.