US 6,183,235 B2Granted

Electrically-operated injection molding machine

AssigneesToyo Machinery & Metal Co., Ltd., Sony Disc Technology Inc.

InventorsYoshiya Taniguchi, Nobuyuki Hirayama, Yoshiaki Hara

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Abstract

A precision injection molding apparatus is provided with servo mechanisms in various portions of the apparatus including a resin injection portion to provide precise feedback control of resin weighing, blending, and injection of weighed and blended resin into a die cavity between closed dies, a die opening and closing portion to provide precise feedback control for driving a movable die from a spaced position into a closed position relative to a fixed die to provide the die cavity, a gate cutting portion to provide precise feedback control of gate cutting, a molding ejecting portion to provide precise feedback control of ejecting a formed molding and a molding removing portion to provide precise feedback control for removing the molding from between opened dies. Because servo mechanisms are used, there is no variation in repetitive response accuracy of motion and speed of operation can be increased in terms of cycle speeds without loss of accuracy.

Claims8

Dependent claims

A precision injection molding machine, comprising:

a resin injection portion including apparatus configured to provide precise feedback control of a resin servo mechanism providing resin weighing, blending and injection of weighed and blended resin into a die cavity between closed dies;
a die opening and closing portion including apparatus configured to provide precise feedback control of a die servo mechanism driving a movable die into a closed position relative to a fixed die to provide the die cavity between closed dies and to a spaced position relative to the fixed die to open the dies;
a gate cutting portion including apparatus configured to provide precise feedback control of a gate cutting servo mechanism providing gate cutting after resin injection into the die cavity is completed;
a molding ejecting portion including apparatus configured to provide precise feedback control of a molding ejecting servo mechanism providing ejection of a formed molding after the dies are open;
and
a molding removing portion including apparatus configured to provide precise feedback control of a molding removing servo mechanism configured to remove the molding from between opened dies.

3 more elements

An injection molding machine comprising:

a movable die plate mounting a movable die;
a housing with a toggle mechanism;
a pressure sensor placed between said movable die plate and said housing and configured to sense a reactive force arising from resin in a die cavity between a fixed die and the movable die;
a toggle servo motor configured to drive said toggle mechanism to move said movable die plate mounting and said movable die so that said movable die engages the fixed die;
a servo controller configured to feedback control resin injection pressure into the die cavity,
the feedback controller also providing feedback control of a die clamping force between the fixed die and the movable die and position control of said movable die based on data from said pressure sensor indicating relative pressure on the resin in said cavity.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/110,130Filed 6 Jul 1998
Priority: JP 9-1978257 Jul 1997
Granted: 6 Feb 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification35 codes

B29C 45/4005
Removing or ejecting moulded articles: ejector constructions; Ejector operating mechanisms
B29C 45/38
Component parts, details or accessories; Auxiliary operations: cutting-off equipment for sprues or ingates
B29C 45/561
Using mould parts movable during or after injection, e.g. injection-compression moulding: injection-compression moulding
B29C 45/77
Measuring, controlling or regulating: of velocity or pressure of moulding material