1. A method for quality assurance of screw joint tightening of a screw joint to a needed pretension condition (FN) by a torque delivering power tool, comprising:
performing at least one simulation procedure of a screw joint tightening process via a specific algorithm aiming at said needed pretension condition (FN) by using programmed data concerning screw joint geometry, expected frictional conditions, operational characteristics of the power tool, a chosen tightening strategy, and adaptable values of at least one tightening parameter, thereby arriving at a simulated pretension condition (FS) acceptably close to said needed pretension condition (FN),
performing in practice a practical screw joint tightening process by controlling the power tool in accordance with said chosen tightening strategy and aiming at said needed pretension condition (FN) by using said specific algorithm as well as programmed data concerning said screw joint geometry, said operational characteristics of the power tool, and tightening parameter values as derived from said simulation procedure, thereby arriving at a practically processed pretension condition (FP),
comparing said practically processed pretension condition (FP) with said simulated pretension condition (FS), and
evaluating the outcome of said comparison for quality acceptance or refusal.
2. The method according to claim 1, wherein said simulation procedure is repeated a number of times and based on a method of randomly choosing values of said data within standard deviation ranges, thereby obtaining a mean value and a deviation range of said simulated pretension condition (FS), and wherein said practically processed pretension condition (FP) is compared to limits of said deviation range to obtain acceptance or refusal of said practically processed pretension condition (FP).
3. The method according to claim 2, wherein the practical screw joint tightening process is performed repeatedly, and values of all resultant practically processed pretension conditions (FP) are compared and statistically evaluated both with regards to the limits of said deviation range and to said mean value of said simulated pretension condition (FS).
4. The method according to claim 3, wherein a practically processed pretension condition (FP) falling outside the limits of said deviation range is analyzed by tightening and loosening of an actual screw joint, thereby determining whether there is a frictional or geometrical influence that has caused such unacceptable deviation of said practically processed pretension condition (FP) falling outside the limits of said deviation range.
5. The method according to claim 2, wherein results of said at least one simulation procedure of the screw joint tightening process include parameter values of torque (T), angle of rotation (A) and torque rate (dTdA) obtained at the simulated pretension condition (FS), and parameter values obtained in the practical screw joint tightening process are compared to the parameter values obtained at said at least one simulation procedure of the screw joint tightening process.
6. The method according to claim 5, wherein a practically processed pretension condition (FP) falling outside the limits of said deviation range is analyzed by tightening and loosening of an actual screw joint, thereby determining whether there is a frictional or geometrical influence that has caused such unacceptable deviation of said practically processed pretension condition (FP) falling outside the limits of said deviation range.
7. The method according to claim 2, wherein a practically processed pretension condition (FP) falling outside the limits of said deviation range is analyzed by tightening and loosening of an actual screw joint, thereby determining whether there is a frictional or geometrical influence that has caused such unacceptable deviation of said practically processed pretension condition (FP) falling outside the limits of said deviation range.
8. The method according to claim 1, wherein results of said at least one simulation procedure of the screw joint tightening process include parameter values of torque (T), angle of rotation (A) and torque rate (dTdA) obtained at the simulated pretension condition (FS), and parameter values obtained in the practical screw joint tightening process are compared to the parameter values obtained at said at least one simulation procedure of the screw joint tightening process.
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 registration device operative to maintain a prescribed separation distance between an array of print head nozzles and a substrate material during print operations, the registration device comprising:
a registration surface opposing a face surface of the substrate material and being textured to define a plurality of contact surfaces substantially evenly distributed over the face surface of the substrate material, the contact surfaces reducing a surface area in contact with the substrate material to mitigate particulate matter shed from the substrate material;
wherein the contact surfaces are defined by a plurality of grooves oriented substantially parallel to a feed path of the substrate material, each of the grooves defining a substantially serpentine-shape and wherein adjacent grooves are out-of-phase such that the contact surfaces are staggered from one row of contact surfaces to an adjacent row of contact surfaces.
2. The registration device according to claim 1 wherein the contact surfaces have a substantially arcuate shaped surface contour.
3. The registration device according to claim 1 wherein the contact surfaces have a substantially elongate diamond shape.
4. The registration device according to claim 1 wherein each groove defines a lead angle within a range of between about five degrees (5\xb0) to about fifteen degrees (15\xb0).
5. The registration device according to claim 1 wherein the registration surface includes an opening through which ink is deposited, the opening having an edge upstream of at least one of the nozzles and wherein the upstream edge defines an obtuse angle relative to the feed path of the substrate material.
6. The registration device according to claim 5 wherein the obtuse angle is greater than about one-hundred and five degrees (105\xb0) relative to the feed path of the substrate material.
7. The registration device accord to claim 6 wherein the obtuse angle is greater than about ninety-five degrees (95\xb0) relative to the feed path of the substrate material.
8. A print station for a mailpiece inserter comprising:
an array of print head nozzles operative to deposit ink on a mailpiece envelope being conveyed along a feed path; and
a registration plate spatially positioned relative to the print head nozzles and operative to maintain a prescribed separation distance between the registration plate and the print head nozzles, the registration plate having a registration surface opposing a top face surface of the mailpiece envelope and being textured to define a plurality of contact surfaces substantially evenly-distributed over, and engaging, the face surface of the mailpiece envelope, the contact surfaces, furthermore, defined by a plurality of grooves having a substantially serpentine shape and oriented substantially parallel to the feed path of the mailpiece envelope, the adjacent grooves being out-of-phase such that contact surfaces of one row are staggered relative to the contact surfaces of an adjacent row, and
wherein the contact points reduce a surface area in contact with the substrate material to mitigate particulate matter shed from the substrate material.
9. The print station according to claim 8 wherein the contact surfaces have a substantially arcuate shaped surface contour.
10. The print station according to claim 8 wherein the contact surfaces have a substantially elongate diamond shape.
11. The print station according to claim 8 wherein each groove defines a lead angle within a range of between about five degrees (5\xb0) to about fifteen degrees (15\xb0).
12. The print station according to claim 8 wherein the registration surface includes an opening through which ink is deposited, the opening having an edge upstream of at least one of the nozzles and wherein the upstream defines an obtuse angle relative to the feed path of the mailpiece envelope.
13. The registration device according to claim 12 wherein the obtuse angle is greater than about one-hundred and five degrees (105\xb0) relative to the feed path of the mailpiece envelope.
14. The registration device accord to claim 13 wherein the obtuse angle is greater than about ninety-five degrees (95\xb0) relative to the feed path of the mailpiece envelope.