Adjusting emulated encoder frequencies

Patent metadata

Field	Value
Publication number	US-10422665-B2
Application number	US-201415519802-A
Country	US
Kind code	B2
Filing date	Oct 28, 2014
Priority date	Oct 28, 2014
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

Adjusting emulated encoder frequencies in an example embodiment can include determining a difference between an encoder count and a theoretical encoder count and adjusting a frequency of an emulated encoder signal to mitigate at least some of the difference between the encoder count and the theoretical encoder count.

First claim

What is claimed:

1. A system, comprising:
a determine engine to determine a difference between an encoder count and a theoretical encoder count;
an adjust engine to adjust a frequency of an emulated encoder signal to mitigate at least some of the difference between the encoder count and the theoretical encoder count; and
a generate engine to generate the emulated encoder signal at the adjusted frequency.

2. The system of claim 1 , wherein the encoder count is a total number of counts of a counter that is equal to a total number of ticks generated by a media encoder unit during a time interval between top of form (TOF) marks passing a sensor.

3. The system of claim 2 , wherein the TOF marks comprise consecutive TOF marks passing the sensor that senses the TOF marks.

4. The system of claim 1 , wherein the theoretical encoder count is calculated based on a desired printing resolution and a specified distance between consecutive top of form (TOF) marks on a media.

5. The system of claim 1 , wherein the frequency of the emulated encoder signal is calculated based on a speed of a media, and wherein the speed of the media is determined from signals received from sensors that sense invisible marks on media.

6. The system of claim 5 , wherein the invisible marks are detectable by the sensors and include at least one of ultraviolet (UV) marks, infrared (IR) marks, magnetic marks, and heat marks.

7. The system of claim 1 , wherein the encoder is a media encoder unit.

8. A non-transitory computer readable medium storing instructions executable by a processing resource to cause a device to:
count, via a counter, a total number of ticks generated by an encoder during a time interval between consecutive top of form (TOF) marks on media passing by a sensor included in the encoder;
determine a difference between the encoder count and a theoretical encoder count;
adjust a frequency of an emulated encoder signal to mitigate at least some of the difference between the encoder count and the theoretical encoder count; and
generate the emulated encoder signal, via an encoder signal emulator, at the adjusted frequency.

9. The medium of claim 8 , wherein the emulated encoder signal simulates an encoder signal of a mechanical encoder.

10. The medium of claim 8 , wherein an encoder count is counted between each subsequent TOF mark passing by the sensor of the encoder.

11. The medium of claim 8 , wherein the frequency is adjusted to maintain the encoder count within a range of the theoretical encoder count.

12. A method, comprising:
sensing, via a sensor, invisible marks and top of form (TOF) marks on media during continuous printing of a print job on the media;
calculating a frequency of an emulated encoder signal from a speed of the media based on the sensed invisible marks;
counting, via a counter, a total number of ticks generated by an encoder during a time interval between sensing consecutive TOF marks;
determining a difference between a value of the encoder count and a value of theoretical encoder count; and
adjusting the frequency of the emulated encoder signal to mitigate at least some of the difference between the value of encoder count and the value of theoretical encoder count.

13. The method of claim 12 , including generating the emulated encoder signal at the adjusted frequency to control a printer continuously printing the print job.

14. The method of claim 12 , including rounding a value of the encoder count to mitigate at least some of the difference between the value of the encoder count and the value of the theoretical encoder count.

15. The method of claim 14 , wherein the adjusted frequency corresponds to the rounded value of the encoder count.

Assignees

• Hewlett Packard Development Co

Inventors

• Fernandez Espasa Cèsar
• Thapa Ajin
• Graham Mark C

Classifications

• G01P21/02

  of speedometers · CPC title

• G01P3/50

  for measuring linear speed (G01P3/56 takes precedence) · CPC title

• G01D5/24476 Primary

  Signal processing (G01D5/2448 - G01D5/24495 take precedence) · CPC title

• G01D5/34746

  Linear encoders · CPC title

• G01D5/12

  using electric or magnetic means (G01D5/06 takes precedence) · CPC title