Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1976-05-10
1977-12-13
Spicer, Jr., Robert L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
425136, 425149, 425354, B29C 306
Patent
active
040629147
ABSTRACT:
A tablet compressing machine includes strain gauge sensors 5, 5' for monitoring the forces applied to piston rams 1, 2 by pressure rollers 3,4. The strain gauges are connected in a bridge circuit whose amplified output is fed to a mean value generator 15 and a logic control unit 9. The former generates a mean pressing force curve (A in FIG. 3) while the latter causes preset individual limit values for the pressing force signals (B, C in FIG. 3) to track fluctuations in the mean value curve, and compares the instantaneous pressing force signals with the individual limit values. Whenever these limit values are exceeded or fallen below the machine is disabled and the faulty ram is indicated on a display 14 by means of a sensor 7 which signals the ram being monitored. Means are also provided for disabling the machine whenever the mean value exceeds or falls below adjustable tolerance limits.
REFERENCES:
patent: 3255716 (1966-06-01), Knoechel et al.
patent: 3525382 (1970-08-01), Devol
patent: 3734663 (1973-05-01), Holm
patent: 3807914 (1974-04-01), Paulson et al.
patent: 3891375 (1975-06-01), Pilewski
Fa. Wilhelm Fette GmbH
Spicer, Jr. Robert L.
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