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
Patent
1988-04-13
1990-01-23
Woo, Jay H.
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
264 405, 425150, B29C 4577, B29C 4580
Patent
active
048955051
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an injection molding machine having a drive source which is of a linear motion type electric motor.
2. Description of the Related Art
An injection molding machine includes various mechanisms such as an injection mechanism for axially moving a screw to perform injection operation, a clamping mechanism for opening, closing and clamping molds, an ejector mechanism for axially moving an ejector pin to extrude a molded product, and a nozzle touch mechanism for touching a nozzle to the mold. Each of these mechanisms has its axis (hereinafter referred to as linear motion member) arranged to be linearly driven. A screw is an example of such a linear motion member.
In a hydraulically operated injection molding machine, it is easy to cause linear motion of these linear motion members, by driving the members with a hydraulic cylinder. On the other hand, in a conventional electrically operated injection molding machine, a rotational output of an electric motor is converted into a driving force (hereinafter referred to as linear driving force) which acts on the associated linear motion member in the direction along which the same member moves. This is done with a conversion mechanism, such as a ball screw and nut, so that the linear motion member is moved by the linear driving force.
In this manner, a conventional injection molding machine requires a conversion mechanism, and is hence complicated in construction and high in cost. Moreover, it requires space for installation of the conversion mechanism, and has the drawback that the whole arrangement becomes large in size.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an injection molding machine which is simple and compact in construction and is low-priced.
In order to achieve the above-mentioned object, an injection molding machine according to the present invention includes a linear motion member arranged to be linearly movable relative to a main body of the injection molding machine, and a linear motion type electric motor supported by the main body of the molding machine. Further, the linear motion member is coupled to a movable portion of the motor in a manner so as to be movable in unison with the movable portion which is arranged to be linearly movable relative to a stationary portion of the motor.
As mentioned above, according to the present invention, since the linear motion type electric motor is employed as the drive source of the linear motion member, no conversion mechanism for converting rotational driving force into linear driving force is required. As a result, an injection molding machine can be provided, which is simple and compact in construction and low in cost.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view showing an essential portion of an injection molding machine according to an embodiment of the present invention;
FIG. 2 is a fragmentary perspective view showing a linear motion type electric motor of the FIG. 1 embodiment;
FIG. 3 is a fragmentary schematic longitudinal section view showing the motor of FIG. 2;
FIG. 4 is a diagram showing a waveform of a three-phase alternating current supplied to the motor;
FIG. 5A is a view explaining a positional relationship between a stator of the linear motor and a movable section of the motor;
FIG. 5B is a diagram showing waveforms of an electric current flowing through the stator, magnetic field generated by the current, and magnetic field generated by the movable section, when the positional relationship of FIG. 5A is assumed;
FIG. 6A is a view showing a different positional relationship between the stator and the movable section;
FIG. 6B is a diagram showing a waveform associated with the positonal relationship of FIG. 6A;
FIG. 7A is a view explaining a further different positional relationship; and
FIG. 7B is a diagram showing a waveform associated with the positional relationship of FIG. 7A.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows an inject
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Inaba Yoshiharu
Sogabe Masatoyo
Fanuc Ltd
Heitbrink Timothy W.
Woo Jay H.
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