Method and apparatus for quality control of molded articles manu

Details Method and apparatus for quality control of molded articles manu Method and apparatus for quality control of molded articles manu

1989-01-23

1990-10-16

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Measuring a weight or volume

177145, 177180, 425 73, 425140, B29C 4576

Patent

active

049633023

ABSTRACT:
A method and apparatus for quality control of molded articles manufactured by injection molding machines or die casting machines. The method includes weighing individual molded articles after they have been ejected from the mold. The actual weight of the molded article is compared to a desired weight and the resulting difference signal is used for influencing the injection molding machine or the die casting machine in order to correct the weight of the molded articles. The molded articles are each guided as exactly as possible onto the center of a weighing zone of the test balance and the entire weighing zone is protected at least during each weighing procedure against ambient influences. The apparatus for carrying out the method includes an electronic test balance arranged after a discharge hopper for the molded articles. The electronic test balance is used for providing an output signal for influencing the injection molding machine or the die casting machine. A centering duct for the molded articles can be moved from the discharge hopper at least temporarily closely to the weighing zone of the test zone. A protective hood can be placed at least temporarily over the entire weighing zone.

REFERENCES:
patent: 3910737 (1975-10-01), Shimada et al.
patent: 4664207 (1987-05-01), Knothe et al.
patent: 4755122 (1988-07-01), Schmidt

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