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Process and apparatus for automatically cutting out work pieces in accordance with a pattern
| Details |
Inventors: Boehme, Dietrich; Hahn, Gunter; Schumann, Gunter; Wienen, Walter; Jung, Rolf;
Assignee: Messer Griesheim GmbH (Frankfurt am Main, DT); Krauss und Reichert (Fellbach, Stuttgart, DT)
Primary Examiner: Yost; Frank T.
Assistant Examiner:
Attorney, Agent or Firm: Connolly and Hutz
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. |
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DETAILED DESCRIPTION We claim: 1.
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.
2.
A process as set forth in claim 1 wherein the speed-changing marks are disposed ahead of changes in direction of the linear element, and the control signal generated in response to its detection is a speed-retarding signal.
3.
A process as set forth in claim 2 wherein speed-accelerating marks are disposed after the changes in direction of the linear element, and the control signal generated in response to the detection of a speed accelerating-mark is a speed-accelerating signal.
4.
A process as set forth in claim 1 wherein the photoelectric scanning apparatus has an axis of rotation, the scanning occurs at an overhanging distance ahead of the axis of rotation, and wherein the overhanging distance is varied after the speed of the drive mechanism has been changed.
5.
A process as set forth in claim 4 wherein the magnitude of the overhanging distance is changed a predetermined time after the control signal is initiated.
6.
A process as set forth in claim 5 wherein the speed-changing mark is disposed ahead of a change in direction of the linear element in the path of travel of the cutting device, the control signal is a speed-retarding signal, and the overhanging distance is reduced a predetermined time after the speed-retarding control signal is generated
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Obesity Surgery 
