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AssigneesMesser Griesheim GmbH, Krauss und Reichert
InventorsDietrich Boehme, Gunter Hahn, Gunter Schumann, Walter Wienen, Rolf Jung
Estimating the term…
Retarding markings are provided alongside a linear pattern to be cut out by an automatic device guided by a photoelectric scanner. The markings are disposed a short distance ahead of the changes in direction of the pattern line, which is greater than the resultant decelerating path of the advance motors from the original faster advance speed to the resultant slower advance speed. A timing circuit initiates the change in advance speed after the retarding mark is detected and a second timing circuit changes the overhang of the line-scanning photocells from an initial greater magnitude to the lesser required magnitude correspond to the slower advance speed. Acceleration marks may also be provided after directional changes in the pattern to accelerate the advance speed back to the original advance speed after the changes in directions are accomplished. A third timing circuit is then provided to subsequently increase the advance speed and overhang of the photoelectric cells ahead of the axis of rotation of the scanning head back to their original magnitude.
A process for controlling a cutting device which is automatically traversed by a drive mechanism controlled by a photoelectric scanning apparatus to cut a work piece in accordance with a pattern having a linear element comprising the steps of providing speed-changing marks alongside the linear element, detecting the speed-changing marks by means of the scanning apparatus, and generating a control signal in the scanning apparatus in response to its detection of a speed-changing mark whereby the speed of the drive mechanism is correspondingly changed, the scanning occurs at variable overhanging distances at the front of the photoelectric scanning apparatus, and wherein the overhanging distance is varied after the speed of the drive mechanism has been changed, whereby the overhanging distance is longer for faster speeds of drive mechanism and shorter for slower speeds of the drive mechanism.
An apparatus for controlling a device for automatically cutting out a work piece in accordance with a pattern having a linear element with speed-changing marks disposed alongside which is automatically scanned by a scanning device having photodetecting line detecting means comprising a photoelectric mark detecting element, a variable speed drive for traversing the cutting and scanning devices and an operating control device connected to the photoelectric mark detecting element and to the drive whereby the drive is caused to change its speed when a speed-changing mark is detected, the speed-changing mark is disposed ahead of a change in detection of the linear element and comprises a speed retarding mark, the photoelectric scanning device has a scanning head, first and second photoelectric detectors in the scanning head, the first photoelectric detector being disposed a predetermined overhanging distance ahead of the second photoelectric detector, the operating control system including means for alternatively activating either the first or the second photoelectric detector, and the operating control system being constructed and arranged to normally maintain the first photoelectric detector activated and to activate the second photoelectric detector and inactivate the first photoelectric detector a predetermined time after a speed retarding mark is detected.
Dependencies are inferred from the claim text.