| 摘要 |
<p>An electronic labeling apparatus (1) is disclosed which includes a printing mechanism (18) with a printhead (70) adapted for horizontal travel across an assembly (5,91,96) of identification devices (6) to be imprinted. A web edge sensor (85) is attached to the printhead (70) for concurrent travel therewith. In traversing horizontally across the assembly (5,91,96) the web edge sensor (85) provides a signal to a microprocessor (100) which indicates the presence or absence of the assembly (5,91,96) under the current position of the sensor (85). The microprocessor (100) also receives a timing signal from the printing mechanism (18) indicative of the position of the printhead (70). Based on the timing signal and the signal from the web edge sensor (85), the microprocessor (100) measures a current width of the assembly (5,91,96). The assembly (5,91,96) is especially adapted for use with the invention, and includes notches (90) having a width different than the nominal width of the assembly (5,91,96), each notch (90) being in a fixed relative position with respect to one of the identification devices (6,95,97). The microprocessor (100) is thereby able to control feeding of the assembly (5,91,96) to register the identification devices (6,95,97) for printing by discriminating the current measured width of the assembly (5,91,96) between the nominal width and the width at a notch (90).</p> |
