Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – Means permitting removal or substitution of elements during...
Patent
1986-06-20
1988-03-15
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
Means permitting removal or substitution of elements during...
425192R, 425542, 425567, 425574, B29C 4507
Patent
active
047310057
ABSTRACT:
An injection molding machine includes an injection molding unit which has a plasticizing unit formed of a plasticizing cylinder and a feed screw rotatably and axially shiftably received in the plsticizing cylinder, a supply block having a central passage adapted to receive an end portion of the plasticizing cylinder and a hopper or chute communicating with the passage. The machine has a material changing device which includes a carriage arranged at the injection molding unit for displacement along a travel path with respect to the chute or hopper of the plasticizing unit; a plurality of spaced drop holes arranged on the carriage in a series extending generally parallel to the travel path and being adapted to be individully brought into alignment in a material charging position with the chute dependent on locations of the carriage; a plurality of conduits, each being coupled to a separate drop hole, for admitting plastic material to the chute from a location externally of the injection molding unit; a plurality of gates mounted on the carriage for travel therewith; each gate cooperates with a separate drop hole and each gate has an open position in which plastic material may pass through the respective drop hole from the conduit connected thereto and each gate has a closed position in which passage of the plastic material through the respective drop hole is blocked; a gate control device mounted stationarily with respect to the chute for moving a single selected gate, associated with the drop hole dwelling in the material charging position, into the open or closed position; and a coupling device for connecting the single selected gate to and disconnecting it from the gate control device.
REFERENCES:
patent: 3510915 (1970-05-01), Johansson
patent: 3564658 (1971-02-01), Hehl
patent: 3761198 (1973-09-01), Hehl
patent: 3761214 (1973-09-01), Hehl
patent: 3788788 (1974-01-01), Hehl
patent: 3852010 (1974-12-01), Hehl
patent: 3980208 (1976-09-01), Hehl
patent: 4195934 (1980-04-01), Spanier
patent: 4473346 (1984-09-01), Hehl
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