1. A method for controlling cut-off registration in a printing press having printed webs which pass through respective cut-off register control actuators and are assembled into a bundle for cut-off, the method comprising:
applying print control marks which are invisible to the human eye to each said printed web;
scanning the webs with sensors to determine the actual positions of the marks;
comparing actual positions with desired positions of the marks;
generating signals for the cut-off register control actuators based on the comparison; and
scanning printed images on the web prior to applying the print control marks, the print control marks being applied as a function of the scanning of the printed images,
wherein the webs pass through the cut-off register control actuators downstream of applying the print control marks.
2. The method of claim 1 wherein the print control marks are visible only in ultraviolet light.
3. The method of claim 1 wherein the print control marks are temporarily detectable.
4. The method of claim 1 wherein the print control marks are thermal print control marks.
5. The method of claim 1 wherein the print control marks are radioactive.
6. The method of claim 1 wherein the webs are assembled into a bundle downstream of applying the print control marks, the webs being assembled so that they cover each other.
7. The method of claim 6 wherein the print control marks are used to control the cut-off registers of the covered webs.
8. The method of claim 1 wherein the scanning of the webs with sensors to determine the actual positions of the marks is performed downstream of the cut-off register control actuators.
9. The method of claim 8 further comprising cutting the bundle by means of a cutting knife cylinder immediately downstream of scanning the webs with sensors to determine the actual positions of the marks.
10. The method of claim 4 wherein the thermal print control marks are scanned by heat sensors to determine the actual positions of the marks.
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 saw blade, especially for a handsaw, along the longitudinal edge of which a series of saw teeth is formed which has a geometric saw-tooth base line extending along the saw blade and is divided by at least one tooth gap, preferably a plurality of tooth gaps, into sections of the series comprising a plurality, especially more than two saw teeth, a free space of recessed saw blade material in the area of a tooth gap and extending beyond the saw-tooth base line into the saw blade being provided with an undercut.
2. The saw blade as claimed in claim 1, wherein the free space which is recessed beyond the saw-tooth base line extends in undercutting fashion by a longitudinal directional component of the saw blade, especially a non-negligible one, across part of the area of an adjacent series section, preferably of both these sections.
3. The saw blade as claimed in claim 1, wherein the tooth gap tapers, especially continuously up to the saw-tooth base line, the tooth gap being defined especially by tooth flanks of adjacent saw teeth.
4. The saw blade as claimed in claim 1, wherein the free space widens, especially continuously, essentially from the level of the saw-tooth base line, preferably at a maximum widening angle (\u03b1) of at least approximately 30\xb0.
5. The saw blade as claimed in claim 4, wherein the maximum widening angle (\u03b1) of the free space is greater than a maximum opening angle (\u03b2) of the tooth gap.
6. The saw blade as claimed in claim 1, wherein the tooth gap and the free space pass over one into the other, forming a recess which includes a constriction substantially at the level of the saw-tooth base line.
7. The saw blade as claimed in claim 1, wherein the recess is shaped substantially like a boot, in particular a heel portion of the free space being associated with a free-end face of the saw blade and a toe portion of the free space being associated with a grip-end face of the saw blade.
8. The saw blade as claimed in claim 1, wherein an undercut depth (t1, t2) corresponds to at least one fourth of the average saw-tooth height of the series of saw teeth.
9. The saw blade as claimed in claim 1, wherein an undercut depth (t1, t2) corresponds, at most, to the average saw-tooth height of the series of saw teeth, preferably equalling half of the average saw-tooth height.
10. The saw blade as claimed in claim 1, wherein the free space includes a first undercut facing a free-end face of the saw blade and a second undercut remote from the free-end face of the saw blade, the second undercut especially being located farther from the saw-tooth base line than the first undercut.
11. The saw blade as claimed in claim 10, wherein undercut volumes of the first and second undercuts are substantially the same, or the undercut volume of the second undercut is greater than that of the first undercut, preferably at least 1.5 times greater.
12. The saw blade as claimed in claim 1, wherein a depth (f) of the free space from the saw-tooth base line is substantially equal to the average saw-tooth height of the series of saw teeth.
13. The saw blade as claimed in claim 1, wherein the free space extends like a channel into the saw blade, obliquely with respect to the saw-tooth base line, especially at an acute angle of from 15\xb0 to 75\xb0, preferably approximately 30\xb0, the channel-like free space, in its course towards a grip-end face of the saw blade, extending into the saw blade especially in upward direction with respect to the saw-tooth base line.
14. A handsaw comprising a saw blade along the longitudinal edge of which a series of saw teeth is formed which has a geometric saw-tooth base line extending along the saw blade and is divided by at least one tooth gap, preferably a plurality of tooth gaps, into sections of the series comprising a plurality, especially more than two saw teeth, a free space of recessed saw blade material in the area of a tooth gap and extending beyond the saw-tooth base line into the saw blade being provided with an undercut.
15. The saw blade as claimed in claim 1 wherein said free space widens at a maximum widening angle (\u03b1) of 90\xb0.