Coordination of printhead/substrate position with transfer of marking material

Patent metadata

Field	Value
Publication number	US-9409389-B1
Application number	US-201514934302-A
Country	US
Kind code	B1
Filing date	Nov 6, 2015
Priority date	Nov 6, 2015
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

Devices and methods load a firing distance into a distance counter of a printing device. The firing distance is the distance from the current position of a printhead of the printing device to a marking location on a substrate. These devices and methods count the firing distance in discrete distance increments using the distance counter, based on relative movement of the substrate and printhead. When the distance counter reaches the last discrete distance increment of the firing distance, these devices and methods load the fractional remaining distance of the firing distance into a time counter of the printing device. Then, such devices and methods count the fractional remaining distance in velocity-based distance increments at regular time intervals using the time counter. When the time counter reaches the last velocity-based distance increment of the fractional remaining distance, these devices and methods transfer the marking material from the printhead to the substrate.

First claim

What is claimed is:

1. A printing apparatus comprising:
a printhead;
a processor operatively connected to said printhead;
a support operatively connected to said processor, said support supporting a substrate adjacent to said printhead, said printhead transferring material toward said substrate;
a distance counter operatively connected to said processor, said distance counter counting in discrete distance increments as said substrate moves relative to said printhead; and
a time counter operatively connected to said processor, said time counter counting in velocity-based distance increments at regular time intervals,
said processor loading a firing distance into said distance counter, said firing distance being a distance from a current position of said printhead to a marking location on a substrate,
said distance counter counting said firing distance in said discrete distance increments, based on relative movement of said substrate and said printhead,
said processor loading a fractional remaining distance of said firing distance into said time counter when said distance counter reaches a last discrete distance increment of said firing distance,
said time counter counting said fractional remaining distance in said velocity-based distance increments at said regular time intervals, and
said printhead transferring material to said substrate when said time counter reaches a last velocity-based distance increment of said fractional remaining distance.

2. The printing apparatus according to claim 1 , said processor determining said velocity-based distance increments based on a current relative velocity between said printhead and said substrate.

3. The printing apparatus according to claim 1 , said fractional remaining distance comprising a distance less than one of said discrete distance increments.

4. The printing apparatus according to claim 1 , further comprising a time clock operatively connected to said time counter, said regular time intervals corresponding to time signals received by said time counter from said time clock.

5. The printing apparatus according to claim 1 , said processor at least one of:
compensating for thermal expansion by making a distance amount of said discrete distance increments a function of temperature of said substrate; and
compensating for physical irregularities of any devices by making said distance amount of said discrete distance increments a function of encoder position.

6. A printing apparatus comprising:
a printhead;
a processor operatively connected to said printhead;
a support operatively connected to said processor, said support supporting a substrate adjacent to said printhead, said printhead transferring material toward said substrate;
a distance counter operatively connected to said processor, said distance counter counting in discrete distance increments as said substrate moves relative to said printhead; and
a time counter operatively connected to said processor, said time counter counting in velocity-based distance increments at regular time intervals,
said processor loading a firing distance into said distance counter, said firing distance being a distance from a current position of said printhead to a marking location on a substrate,
said distance counter counting said firing distance in said discrete distance increments, based on relative movement of said substrate and said printhead,
said processor loading a fractional remaining distance of said firing distance into said time counter when said distance counter reaches a last discrete distance increment of said firing distance,
said time counter counting said fractional remaining distance in said velocity-based distance increments at said regular time intervals,
said printhead transferring material to said substrate when said time counter reaches a last velocity-based distance increment of said fractional remaining distance,
said processor adding a next firing distance of a subsequent marking location and said fractional remaining distance to said distance counter, and
said printing apparatus repeating said counting said firing distance, said loading said fractional remaining distance, said counting said fractional remaining distance, and said transferring said material for said subsequent marking location.

7. The printing apparatus according to claim 6 , said processor determining said velocity-based distance increments based on a current relative velocity between said printhead and said substrate.

8. The printing apparatus according to claim 6 , said fractional remaining distance comprising a distance less than one of said discrete distance increments.

9. The printing apparatus according to claim 6 , further comprising a time clock operatively connected to said time counter, said regular time intervals corresponding to time signals received by said time counter from said time clock.

10. The printing apparatus according to claim 6 , said processor at least one of:
compensating for thermal expansion by making a distance amount of said discrete distance increments a function of temperature of said substrate; and
compensating for physical irregularities of any devices by making said distance amount of said discrete distance increments a function of encoder position.

11. A method comprising:
loading a firing distance into a distance counter of a printing device, said firing distance being a distance from a current position of a printhead of said printing device to a marking location on a substrate;
counting said firing distance in discrete distance increments using said distance counter, based on relative movement of said substrate and said printhead;
loading a fractional remaining distance of said firing distance into a time counter of said printing device when said distance counter reaches a last discrete distance increment of said firing distance;
counting said fractional remaining distance in velocity-based distance increments at regular time intervals using said time counter; and
transferring material from said printhead to said substrate when said time counter reaches a last velocity-based distance increment of said fractional remaining distance.

12. The method according to claim 11 , further comprising determining said velocity-based distance increments based on a current relative velocity between said printhead and said substrate.

13. The method according to claim 11 , said fractional remaining distance comprising a distance less than one of said discrete distance increments.

14. The method according to claim 11 , said regular time intervals corresponding to time signals received from a time clock of said printing device.

15. The method according to claim 11 , further comprising at least one of:
compensating for thermal expansion by making a distance amount of said discrete distance increments a function of temperature of said substrate; and
compensating for physical irregularities of any devices by making said distance amount of said discrete distance increments a function of encoder position.

16. A method comprising:
loading a firing distance into a distance counter of a printing device, said firing distance being a distance from a current position of a printhead of said printing device to a marking location on a substrate;
counting said firing distance in discrete distance increments using said distance counter, based on relative movement of said substrate and said printhead;
loading a fractional remaining distance of said firing distance into a time counter of said printing device when said distance counter reaches a last discrete distance increment

Assignees

• Xerox Corp

Inventors

• Donaldson Patricia J
• Monahan Michael B
• Filion Joseph L

Classifications

• B41J2/04586

  controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type · CPC title

• B41J2/04573 Primary

  Timing; Delays · CPC title

• B41J2/2135 Primary

  Alignment of dots · CPC title