Molding machine

Details Molding machine Molding machine

1999-04-29

2001-06-19

Heitbrink, Tim (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

C425S557000, C425S576000

Reexamination Certificate

active

06247913

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a molding machine having a drive unit for rotating and reciprocating a movable body, such as a screw.
2. Description of the Relevant Art
An in-line screw injection molding machine equipped with a motor drive unit for rotating and reciprocating a screw is disclosed in, for example, Japanese Patent Application Laid-Open (kokai) No. 9 (1997)-11290.
Such an injection molding machine includes a measurement-related drive section, which employs a first servomotor and is adapted to rotate a screw, and an injection-related drive section, which employs a second servomotor and is adapted to reciprocate the screw. In a measuring step, the measurement-related drive section causes the screw to rotate, thereby plasticizing and measuring a molding material. In an injection step, the injection-related drive section causes the screw to advance, thereby injecting and charging the measured resin into a mold. Many molding machines employ a drive unit for driving a movable body, such as a screw, in two different operation modes as mentioned above.
However, since such a drive unit employs one servomotor for each drive section, as many servomotors as drive sections are required. Further, the drive section for reciprocating the movable body requires not only a servomotor but also a motion conversion mechanism, such as a ball screw mechanism, in order to convert the rotational motion of the servomotor to a linear motion. As a result, due to an increase in the number of components, the overall structure of an injection molding machine becomes complicated and increases in size, resulting in an impairment in reliability and a great increase in overall cost.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a molding machine which may be a preplasticization injection molding machine, an in-line screw injection molding machine, or a molding machine having a rotary table mechanism and which can reduce the number of components, while simplifying and downsizing the overall structure.
Another object of the present invention is to provide a molding machine capable of improving reliability and achieving great cost reduction.
To achieve the above objects, a molding machine of the present invention comprises a drive unit which, in turn, comprises a rotary motor and a thrust generator. The shaft of the rotary motor can be moved in the axial direction by the thrust generator. The shaft is connected to a movable body so as to rotate the movable body by the rotary motor and to reciprocate the movable body by the thrust generator.
Since the thrust generator is incorporated into the rotary motor, the structure and size of the drive unit become substantially equal to those of a single rotary motor, so that the structure of the drive unit can be simplified and the size of the drive unit can be decreased.


REFERENCES:
patent: 5518394 (1996-05-01), Shiozawa et al.
patent: 5891485 (1999-04-01), Emoto
patent: 6024558 (2000-02-01), Looije et al.
patent: 9-11290 (1997-01-01), None

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