초록 ▼

A dual-hopper supporting structure for the injection unit of an injection molding machine which has a transverse horizontal guide plate slidingly guiding a hopper carriage. To the upper side of the latter are bolted the base assemblies of two raw material hoppers, as well as a translation drive moto

A dual-hopper supporting structure for the injection unit of an injection molding machine which has a transverse horizontal guide plate slidingly guiding a hopper carriage. To the upper side of the latter are bolted the base assemblies of two raw material hoppers, as well as a translation drive motor with a pinion which engages a drive rack on a longitudinal edge of the transverse guide plate. The transverse guide plate has a central charge bore coinciding with the operating position of the hoppers and equidistant evacuation bores in the two waiting positions of the hoppers. In addition to speeding up changeovers in the production setup, the novel structure gives the injection unit marbling capabilities.

대표청구항 ▼

A structure supporting dual raw material hoppers on the injection unit of an injection molding machine for the selective supply of granulate raw material from either hopper into the plastification cylinder of the injection unit, the hopper supporting structure comprising in combination: a mounting h

A structure supporting dual raw material hoppers on the injection unit of an injection molding machine for the selective supply of granulate raw material from either hopper into the plastification cylinder of the injection unit, the hopper supporting structure comprising in combination: a mounting hub associated with a rearward portion of the plastification cylinder of the injection unit, the mounting hub having an upwardly facing mounting face surrounding a charge chute in the form of a bore leading from the mounting face into the plastification cylinder; an elongated transverse guide plate attached to the mounting face of the plastification cylinder so as to extend laterally outwardly on both sides of the plastification cylinder, the guide plate having a central bore forming an extension of said charge chute; a hopper base assembly with a discharge opening forming part of each raw material hopper; a hopper carriage adapted for the attachment thereto of the two hopper base assemblies and for a supporting the two hoppers at a fixed distance from each other, the hopper carriage being supported and guided on the transverse guide plate, for the execution of translational movements of the hopper carriage along the guide plate over a distance which is equal to the distance between the discharge openings of the two hopper base assemblies, so that either of the two hoppers is alternatingly movable from a lateral waiting position into an operating position in which the discharge opening of its hopper base assembly is aligned with the cental bore of the guide plate and the charge chute, for gravity flow of raw material from the hopper into the plastification cylinder; and translation drive means associated with the hopper carriage and the transverse guide plate for the mechanized execution of the translational movements of the hopper carriage.