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Browse Prior Art Database

Computer Assisted Plastic Molding Machine Controller

IP.com Disclosure Number: IPCOM000083430D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Wilson, CE: AUTHOR

Abstract

Various process parameters are utilized to effect control of plastic injection molding devices to achieve uniform quality parts. Many of the parameters require continuous monitoring to provide an average value to a computer, to enable corrective adjustments to be made during the current or a successive cycle.

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Computer Assisted Plastic Molding Machine Controller

Various process parameters are utilized to effect control of plastic injection molding devices to achieve uniform quality parts. Many of the parameters require continuous monitoring to provide an average value to a computer, to enable corrective adjustments to be made during the current or a successive cycle.

Using the illustrated circuit, it is possible to provide a single integrated output value for a parameter rather than periodically sampling values during realtime, thereby reducing the processor load by providing a single value which is available to the computer at any time during the cycle. Using the circuit to issue the command that alters a cycle parameter also affords change at an exact parameter condition such as temperature or pressure, rather than having an overshoot dependent upon the computer sampling rate used.

In the figure, transducer inputs 5 are received by differential amplifier 6 which supplies an amplified output to a second-stage amplifier 7. Amplifier 7 is an inverting unity gain amplifier, which furnishes drive power with a low-impedance output to reduce noise pickup.

The stage following amplifier 7 is an electronic integrator wherein switches 8 and 9 enable three modes of operation. When switch A is closed and switch 9 open, the integrator is reset. When switch 8 is open and switch 9 is closed, integration is started and when both switches are open the integrated signal is held.

The stage including amplifier 10 and switches 8 and 9 would integrate and hold a tra...