Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Temperature control
Patent
1991-05-29
1992-10-06
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Temperature control
264 406, 425144, 425407, 425409, 425418, 425540, B29C 4578
Patent
active
051530074
ABSTRACT:
A rotary injection molding press having a rotatable platform with a plurality of mold blocks is disclosed, wherein a controller box containing individual temperature control units is mounted on the rotatable platform so as to reliably maintain independent temperature control of each mold block. The controller box includes a rotary coupler for providing a rotating electrical connection from the stationary frame to the controller box, wherein the rotary coupler comprises pairs of wetted electrodes connected through separated pools of mercury. Using this configuration, a highly reliable rotating connection is provided which is substantially frictionless and has a consistently low resistance. Furthermore, by locating the individual temperature control units in a single controller box positioned on the rotatable platform itself, the problem of routing the sensitive control loop signals through a rotating electrical connection is avoided.
REFERENCES:
patent: 2518594 (1950-08-01), Blanchard
patent: 2803853 (1957-08-01), Brazier
patent: 3293691 (1966-12-01), Osgood
patent: 3407443 (1968-10-01), Beebee et al.
patent: 3568247 (1971-03-01), Lunn
patent: 4547140 (1985-10-01), Davis
patent: 4801260 (1989-01-01), Oles et al.
Heitbrink Tim
Illinois Precision Corporation
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