1. An image marking device that marks an image on a substrate based on a tone reproduction curve, the image marking device comprising:
a control unit that digitally controls the tone reproduction curve;
a sensor that reads a calibration patch marked on the substrate by the image marking device;
a target unit that determines a target line width for images that will be marked on print media by the image marking device;
a calculating unit that calculates an estimated line width for images that will be marked on print media by the image marking device, based on the reading of the calibration patch by the sensor;
a comparing unit that compares the calculated estimated line width with the determined target line width; and
an adjusting unit that modifies one or more settings of the image marking device so that the calculated estimated line width becomes closer to the determined target line width, wherein the control unit implements a digital correction that compensates for impact of the modification of the one or more settings on the tone reproduction curve.
2. The image marking device according to claim 1, wherein the calibration patch includes any of a halftone pitch, a predetermined density, a predetermined dot pattern or a predetermined line pattern.
3. The image marking device according to claim 1, wherein the one or more settings include any of exposure intensity and cleaning field intensity.
4. The image marking device according to claim 1, wherein the sensor measures reflectance of the calibration patch.
5. The image marking device according to claim 1, wherein the image marking device is a xerographic marking device.
6. A method that adjusts an image marking device that marks on image on a substrate based on a tone reproduction curve, the method comprising:
digitally controlling the tone reproduction curve;
reading, by a sensor, a calibration patch marked on the substrate by the image marking device;
determining a target line width;
calculating an estimated line width based on the reading of the calibration patch by the sensor;
comparing the calculated estimated line width with the determined target line width; and
modifying one or more settings of the image marking device so that the calculated estimated line width becomes closer to the determined target line width, and implementing a digital correction in the digital control to compensate for impact of the modification of the one or more settings on the tone reproduction curve.
7. The method according to claim 6, wherein the calibration patch includes any of a halftone pitch, a predetermined density, a predetermined dot pattern and a predetermined line pattern.
8. The method according to claim 6, wherein the one or more settings include any of exposure intensity and cleaning field intensity.
9. The method according to claim 6, wherein the sensor measures reflectance of the calibration patch.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for moving tubulars from a horizontal position to a vertical position over a well center of a wellbore, to perform one or more drilling operations, production operations, workover operations, or combinations thereof, wherein the method comprises:
a. raising a catwalk to an elevation equivalent to a drill floor of a drilling rig mounted on a trailer, wherein the drilling rig has a mast with crown connected to a subbase, a top drive slidably connected to the mast, and a drill line connected from a drawworks to the top drive through the crown;
b. rolling a tubular from a pipe rack or a bucking machine to a first loading arm, mounted to the trailer, wherein the first loading arm is positioned flush with the pipe rack or the bucking machine;
c. raising the first loading arm with the tubular to a position flush with the catwalk;
d. rolling the tubular from the first loading arm onto the catwalk;
e. extending a plurality of top drive links from the a top drive, the plurality of top drive links having an elevator;
f. grabbing a first end of the tubular with the elevator;
g. using the drawworks and the drill line, hoisting the tubular connected to the elevators of the top drive while maintaining a connection between the tubular and the catwalk;
h. grabbing the tubular on a second end with a tailing arm connected to a pivoting tubular grabber, wherein the tailing arm is connected to the mast;
i. pivoting the tailing arm to guide the second end of the tubular to a well center while maintaining the second end of the tubular adjacent the drill floor;
j. connecting hydraulic tongs to the second end of the tubular;
k. lowering the top drive with the drawworks and drill line, enabling the second end of the tubular to connect with an end of a drill string in the wellbore;
l. disengaging the tubular from the catwalk;
m. making up a joint between the tubular and the drill string with the hydraulic tongs;
n. using a second loading arm to raise a second tubular from the pipe rack or the bucking machine to the catwalk to sequentially perform step (b) to step (n), when the first loading arm is rolling the tubular onto the catwalk; and
o. repeating step (b) to step (n), until all needed tubulars for the drill string are installed in the wellbore.
2. The method of claim 1, further comprising using a raising mechanism to raise the catwalk from the trailer.
3. The method of claim 1, further comprising using a loading arm feed start positioner for each loading arm mounted on the trailer, and using a catwalk feed start positioner located on the catwalk to prevent each tubular from sliding, and to correctly position each tubular and wherein the catwalk feed start positioner slidably engages the tubular to prevent backsliding of the tubular off each loading arm or off the catwalk.