Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
292 words
A method for the synchronization of an approximately constant transport speed photosensitive material web in a phototypesetting process, wherein an optical path is deflected into deflection lines which are relatively transverse to the direction of motion of the material web and said web is scanned to expose an image while the web transport speed and the optical path deflection speed are controllable by common clock pulses and where at the beginning of each path deflection line a first reference signal (SOL) for time and deflection position is generated, the method comprising the steps of: in the case of an interruption of scanning image exposure, generating further reference signals while continuing line-wise deflection of the optical path; slowing down the movement of the material web beginning with a second selected reference signal after the interruption by n timing pulses to achieve standstill of the web; beginning with a third subsequent reference signal which is the second as from the interruption, accelerating the web by n timing pulses in a direction opposed to the original web transport direction to a speed equal to its original transport speed; subsequently resetting the movement of the web, by p timing pulses, at the original speed until beginning with a predetermined fourth subsequent reference signal, the web is retarded by n timing pulses to standstill; and after a variable interval up to a predetermined fifth subsequent reference signal, accelerating the web by n timing pulses to the original transport speed and subsequently, moving by p timing pulses at the original speed up to a predetermined sixth following reference signal at the occurrence of which the web moving with the original speed reaches a scanning position which is equal to the scanning position with the second selected reference signal.
Claim 2
Independent Claim
292 words
A method for the synchronization of an approximately constant transport speed photosensitive material web in a phototypesetting process, wherein an optical path is deflected into deflection lines which are relatively transverse to the direction of motion of the material web and said web is scanned to expose an image while the web transport speed and the optical path deflection speed are controllable by common clock pulses and where at the beginning of each path deflection line a first reference signal (SOL) for time and deflection position is generated, the method comprising the steps of: in the case of an interruption of scanning image exposure, generating further reference signals while continuing line-wise deflection of the optical path; slowing down the movement of the material web beginning with a second selected reference signal after the interruption by n timing pulses to achieve standstill of the web; beginning with a third subsequent reference signal which is the second as from the interruption, accelerating the web by n timing pulses in a direction opposed to the original web transport direction to a speed equal to its original transport speed; subsequently resetting the movement of the web, by p timing pulses, at the original speed until beginning with a predetermined fourth subsequent reference signal, the web is retarded by n timing pulses to standstill; and after a variable interval up to a predetermined fifth subsequent reference signal, accelerating the web by n timing pulses to the original transport speed and subsequently, moving by p timing pulses at the original speed up to a predetermined sixth following reference signal at the occurrence of which the web moving with the original speed reaches a scanning position which is equal to the scanning position with the second selected reference signal.
Claim 3
Dependent Claim
76 words
A method for the synchronization according to claim 1, where the optical path is deflected into deflection lines by means of a polygon mirror comprising a plurality of reflective faces, wherein as the second reference signal, the signal is selected which is generated when, each time after one rotation of said polygon mirror, the same reflective face starts a deflection line by which said material web in the case of a scanning interruption was last scanned.
Claim 4
Dependent Claim
36 words
A method according to claim 1 wherein said material web, in case of an interruption of the scanning in the retardation or acceleration phases is retarded or accelerated, respectively, with either a constant retardation or acceleration.
Claim 5
Dependent Claim
36 words
A method according to claim 2 wherein said material web, in case of an interruption of the scanning in the retardation or acceleration phases is retarded or accelerated, respectively, with either a constant retardation or acceleration.