Process for moving an injection unit of an injection molding...

Details Process for moving an injection unit of an injection molding... Process for moving an injection unit of an injection molding...

2005-08-30

2005-08-30

Heitbrink, Jill L. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

C425S574000

Reexamination Certificate

active

06936214

ABSTRACT:
A system and process for producing pressing force of an injection unit of an injection molding machine on a mold, which comprises the steps: a) actuating a linear drive unit to bring an injection device to rest on a mold; a working cylinder unit being supplied with fluid via a store during the axial displacement of the injection device until the required rest position on the mold is reached. Provision is made according to one aspect of the invention in that after reaching the rest position on the mold, a blocking element is closed and the connection within a connection unit is opened, and b) the linear drive unit is further actuated, c) a displacement piston is displaced relative to the hydraulic element, and d) increased pressure is produced in the working cylinder unit via a fluid connection in the hydraulic element to increase the contact pressure of the injection unit on the mold.

REFERENCES:
patent: 5147659 (1992-09-01), Watanabe et al.
patent: 5303133 (1994-04-01), Wagner
patent: 5348463 (1994-09-01), Keitel et al.
patent: 6015281 (2000-01-01), Chikazawa et al.
patent: 6432333 (2002-08-01), Emoto
patent: 295 04 297.4 (1995-06-01), None
patent: 08318546 (1996-12-01), None
patent: 2000141434 (2000-05-01), None

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