Abstract: A label sensing mechanism for a printer mechanism is provided. The label sensing mechanism may comprise a first optical sensor and a second optical sensor disposed opposite one another, each of the first optical sensor and the second optical sensor may comprise an emitter and a detector. The first optical sensor and the second optical sensor may be positioned on either side of a paper path along which label liner bearing labels to be printed travels. The first optical sensor and the second optical sensor may be operable together or separately in order to detect label position, preprinted marks on the label liner, and preprinted marks on the labels. A method for sensing labels using such a label sensing mechanism and a printer having such a label sensing mechanism are also provided.

Abstract: A label sensing mechanism for a printer mechanism is provided. The label sensing mechanism may comprise a first optical sensor and a second optical sensor disposed opposite one another, each of the first optical sensor and the second optical sensor may comprise an emitter and a detector. The first optical sensor and the second optical sensor may be positioned on either side of a paper path along which label liner bearing labels to be printed travels. The first optical sensor and the second optical sensor may be operable together or separately in order to detect label position, preprinted marks on the label liner, and preprinted marks on the labels. A method for sensing labels using such a label sensing mechanism and a printer having such a label sensing mechanism are also provided.

Abstract: A USB interface having improved EMC immunity where the D+, D?, and USB ground lines each pass through a common mode choke. The USB 5V line is AC coupled to the USB ground line outside the choke and routed through a high impedance into the circuit while maintaining the integrity of the signal. In addition, bypass capacitors, such as Tantalum bypass capacitors, and a 5.6V Transorb device are added to the 5V power supply of the controller, and all unused pins are terminated to reduce unwanted ringing transients in the controller leadframe. In addition, small capacitors within the capacitive loading specification allowed by the USB-IF are positioned next to the controller on each data line.

Abstract: A method of controlling noise in an impact printer that modulates the input pulse to the power amplifier of the printer. The resulting current waveform is then applied to the print wire solenoids. The final shape of the force input to the platen reduces or spreads the spectral envelope containing problem harmonics and acoustic output noise.

Abstract: A method of controlling noise in an impact printer that modulates the input pulse to the power amplifier of the printer. The resulting current waveform is then applied to the print wire solenoids. The final shape of the force input to the platen reduces or spreads the spectral envelope containing problem harmonics and acoustic output noise.