Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1992-08-03
1993-10-05
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
264334, 425139, 425150, 425164, 425556, 425444, 901 6, 901 49, 414225, B29C 4542, B29C 4580
Patent
active
052502392
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a process and apparatus for controlling the movement of an injection mold and a handling device.
Injection molding machines and similar apparatuses for molding molded parts from plastic or from other materials are frequently operated in connection with a handling device, robot, manipulator or the like. The handling device or the like has a gripping tool, which can be extended in between the mold halves of the opened mold and withdrawn again, in order to remove the molded part from the mold. The opening and closing movements of the mold and the extending and withdrawing movements of the gripping tool must be carefully coordinated with one another in order that collisions and damage are reliably avoided even in cases of malfunctioning, but on the other hand no unnecessary time losses occur.
"Patent Abstracts of Japan", Volume 11, No. 315, M 631, discloses a control system for the gripping tool of an injection molding machine, in which the position of the movable injection mold is continuously sensed and used as a manipulated variable in a control loop controlling the position of the gripping tool. In an additional control loop, which controls the speed of the gripping tool, the positional deviations of the gripping tool and the reference speed of the movable mold serve as manipulated variables. This control apparatus is elaborate, since it is dependent on a constant position and speed sensing of the movable mold and a speed-controlled drive for the gripping tool. JP-A-62-273816 (Patent Abstracts of Japan, volume 12, No. 152, M 695) discloses an injection molding machine of which the gripping tool carries out a lifting and extending movement perpendicularly to the mold-opening movement and subsequently carries out a co-movement with the opening mold half. The lifting and extending movement commence simultaneously in time with the commencement of the opening of the mold, the co-traveling movement is controlled in dependence on the opening speed of the mold. This control apparatus is also complicated and elaborate, since it requires a gripping tool which can move in three spatial directions and a speed-controllable drive for the co-traveling movement of the gripping tool. If it were wished to apply the principle of these known control systems also to the withdrawing movement of the gripping tool and the closing movement of the mold, even more complicated means would be required for the constant speed control of the closing drive of the injection mold.
It is known to avoid collisions between tools moved at essentially constant, and mutually independent speed, such as for example molding tool and gripping tool, by arranging in each case in the travel of the molding tool and the gripping tool a position transmitter which generates a release signal when the tool concerned has, in its opening or withdrawing movement, reached a position at which the extending or closing movement of the other tool can be safely commenced and completed at a predetermined speed. The position at which the release signal is generated need not be the end position, for example of the opening stroke of the molding tool, but it must be ensured that, when generating the release signal, the molding tool has already covered part of its opening travel and has reached such a position that even if the molding tool jams in this position owing to a malfunction, the gripper can complete its extending movement, triggered by the release signal, without risk of damage. Analogously, the gripping tool emits a release signal for closing the molding tool when it withdraws from the region of the molding tool. This signaling point must also be set in such a way that, in the event of slow travel or a standstill of the gripping tool, damage during closing of the molding tool is ruled out in this position.
By virtue of these safety measures, the movement of the one tool can always be released position-dependently only when the other tool has already covered a considerable part of its movement strok
REFERENCES:
patent: 4368018 (1983-01-01), Rees et al.
patent: 4822233 (1989-04-01), Hansel
(Mitsubishi Heavy Ind. Ltd.) Patent Abstracts of Japan, vol. 11, No. 316, M631, abstract from JP62-99127, Pub. Aug. 5, 1987.
(Sumitomo Heavy Ind. Ltd.) Patent Abstracts of Japan, vol. 12, No. 152, M695, abstract from JP 62-273816, Publ. Nov. 27, 1987.
(Fanus Ltd.) Patent Abstracts of Japan, vol. 11, No. 102, M576, abstract from JP 61-249723, Publ. Nov. 6, 1986.
(Japan Steel Works Ltd.) Patent Abstracts of Japan, vol. 11, No. 310, M630, abstract from JP 62-97815, Publ. May 7, 1987.
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