# US 4,397,630 A · Apparatus for loading and injection unit of an injection molding machine

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- Number: US 4,397,630 A
- Document ID: US4397630A
- Status: Granted
- Kind: A
- Application number: 06/255,862
- Filed: 1981-04-20
- Granted: 1983-08-09
- Earliest claimed: 1981-04-20
- Assignees: USM Corporation
- Inventors: Gregory W. Meeker
- Web page: https://patentgrep.com/patent/US4397630A

## CPC

- B29C 31/02: Dispensing from vessels, e.g. hoppers {(into a mould cavity B29C31/04; large containers characterised by discharge means B65D88/28, B65D88/54)}
- B29C 31/068: {of the piston type}
- B29C 45/18: Feeding the material into the injection moulding apparatus {, i.e. feeding the non-plastified material into the injection unit}
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)

## Abstract

An arrangement for loading an injection unit of an injection molding machine by a stuffer apparatus wherein a uniform measure of plastic-like material is consecutively fed to the machine. The arrangement comprises a plurality of container units which are movable from a receiving position under a hopper to a discharge position over the injection unit of the injection molding machine wherein the material is rammed therein. As one of the container units is being emptied into the machine, another container unit may be filled, reducing time between successive loadings and unloadings thereof.

## Claims

### Claim 1

A molding material stuffing mechanism for an injection molding machine comprising means for supplying bulk molding material; at least two open-ended containers; means for moving the containers between the supplying means where each container receives a charge of the material and an inlet for the molding machine; and a plunger movable through the container located at the inlet for forcibly ejecting the material from the container into the inlet, the moving means including a plate for closing one end of each container to support material deposited from the supplying means into the container, the plate also having an opening for directing material ejected from the container into the inlet, the containers being carried by a turntable rotatable on the plate between the supplying means and the opening in the plate, the turntable having openings underlying the containers.

### Claim 2 (depends on 1)

A mechanism according to claim 1 including means engaging the open end of the container at the inlet for locating and sealing the container prior to movement of the plunger.