A method and apparatus for printer compensation is disclosed. A label stop sensor (LSS) detects a time T(1) associated with an initial label position near the beginning of a print job. The label stop sensor detects a time T(L) associated with a label position that is L labels later in the print job.
A method and apparatus for printer compensation is disclosed. A label stop sensor (LSS) detects a time T(1) associated with an initial label position near the beginning of a print job. The label stop sensor detects a time T(L) associated with a label position that is L labels later in the print job. From at least the times T(1) and T(L) and a printer media feed rate a processor calculates a difference between the initial label position and the later label position. A start adjustment factor is compensated by the difference between the initial label position and the later label position to account for changes in print position between the first label and the later label.
대표청구항▼
1. A method of printer compensation, comprising: using a sensor, detecting a time T(1) associated with a first label position;using the sensor, detecting a time T(L) associated with a second label position that is L labels later in a print job;from at least the times T(1) and T(L) and a media feed r
1. A method of printer compensation, comprising: using a sensor, detecting a time T(1) associated with a first label position;using the sensor, detecting a time T(L) associated with a second label position that is L labels later in a print job;from at least the times T(1) and T(L) and a media feed rate, calculating a difference between the first label position and the second label position; andcompensating an adjustment factor by the difference between the first label position and the second label position to account for changes in print position along a label travel path. 2. The method according to claim 1, where the calculating comprises converting times T(1) and T(L) to a distance. 3. The method according to claim 1, where the calculating comprises converting times T(1) and T(L) to a distance represented in printed dots in a feed direction. 4. The method according to claim 1, where detecting the value T(1) further comprises detecting a sequence of M values T(1) through T(M); and where detecting the value of T(L) further comprises detecting a sequence of M adjacent values about label L. 5. The method according to claim 4, further comprising averaging the values of T(1) through T(M) to produce TA(1); and averaging the values of the M adjacent values about label L to produce TA(L). 6. The method according to claim 5, where the calculating comprises from at least the times TA(1) and TA(L), and a feed rate, calculating a difference between the first label position and the second label position. 7. The method according to claim 4, further comprising: converting the M values T(1) through T(M) to distances D(1) through D(M); andconverting the M adjacent values about label L to M distances D(L−M) through D(L). 8. The method according to claim 4, further comprising averaging the values of D(1) through D(L) to produce DA(1); and averaging the values of the M adjacent values about label L to produce DA(L). 9. The method according to claim 5, where the calculating comprises using the distances DA(1) and DA(L) to calculate a difference between the first label position and the second label position. 10. A method of printer compensation, comprising: using a sensor detecting a sequence of time values T(1) through T(M) associated with a first label position;converting the M values T(1) through T(M) to distances D(1) through D(M);using the sensor, detecting times T(L−M) through T(L) associated with a M label positions that are approximately L labels later in the print job;converting the M adjacent values about second label L to L distances D(L−M) through D(L);averaging the values of D(1) through D(M) to produce DA(1);averaging the values of D(L−M) through D(L) to produce DA(L);from at least the distances DA(1) and DA(L), calculating a difference between the first label position and the second label position; andcompensating an adjustment factor by the difference between the first label position and the second label position to account for changes in print position along a label travel path. 11. The method according to claim 10, where the distances are represented in printed dots in a feed direction. 12. A label printer device, comprising: a sensor that detects a transition between labels;a processor that receives and interprets signals from the sensor;a motor that advances a label medium through the printer;the processor being programmed to:use the sensor to detect a time T(1) associated with a first label position;use the sensor to detect a time T(L) associated with a second label position that is L labels later in the print job;from at least the times T(1) and T(L), and a printer feed rate, calculate a difference between the first label position and the second label position; andcompensate an adjustment factor by the difference between the first label position and the second label position to account for changes in print position along a label travel path. 13. A label printer device according to claim 12 where the transition comprises at least one of a space, black mark, hole, or optical element. 14. The apparatus according to claim 12, where the processor is programmed to convert times T(1) and T(L) to distances. 15. The apparatus according to claim 12, where the processor: in detecting the value T(1) is further programmed to detect a sequence of M values T(1) through T(M); andin detecting the value of T(L) is further programmed to detect a sequence of M adjacent values about label L. 16. The apparatus according to claim 15, where the processor is further programmed to: average the values of T(1) through T(M) to produce TA(1);average the values of the M adjacent values about label L to produce TA(L); andcalculate from at least the times TA(1) and TA(L), and a printer media feed rate a difference between the first label position and the second label position. 17. The apparatus according to claim 15, where the processor is programmed to: convert the M values T(1) through T(M) to distances D(1) through D(M);convert the M adjacent values about label L to M distances D(L−M) through D(L);average the values of D(1) through D(M) to produce DA(1); andaverage the values of the M adjacent values about label L to produce DA(L). 18. The apparatus according to claim 12, where the processor is programmed to calculate a difference between the distances DA(1) and DA(L) to calculate a difference between the first label position and the second label position. 19. The apparatus according to claim 18, where the distances DA(1) and DA(L) are represented as a number of printed dots in a feed direction. 20. The apparatus according to claim 12, where the processor is programmed to carry out the compensating by adjusting a value of an adjustment factor.
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