Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Reexamination Certificate
2007-10-24
2010-02-16
Heitbrink, Tim (Department: 1791)
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
C425S149000, C425S150000
Reexamination Certificate
active
07661946
ABSTRACT:
When the screw moves forward, resin backflow occurs. The backflow acts on the screw, applying torque to the screw. During forward movement of the screw, screw torque is produced as shown in FIG.3A if the check ring is not worn, or as shown in FIG.3B if the check ring is worn, because wear increases the backflow and delays the closure of the check ring. The magnitude of the peak screw torque and the associated time and screw position vary depending on the presence or absence of wear, so wear of the check ring is estimated from variations in these physical quantities. The state of wear of the check ring, screw head, check seat, and other parts inside the barrel can be estimated.
REFERENCES:
patent: 5153149 (1992-10-01), Naito et al.
patent: 7556753 (2009-07-01), Uchiyama et al.
patent: 62-003916 (1987-01-01), None
patent: 1-168421 (1989-07-01), None
patent: 01-281912 (1989-11-01), None
patent: 04-028519 (1992-01-01), None
patent: 04-263917 (1992-09-01), None
Maruyama Junpei
Oomori Akira
Takatsugi Satoshi
Fanuc Ltd
Heitbrink Tim
Lowe Hauptman & Ham & Berner, LLP
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