Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to close mold
Reexamination Certificate
1999-10-20
2001-08-14
Heitbrink, Tim (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to close mold
Reexamination Certificate
active
06273708
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor-driven-type injection molding machine in which an injection apparatus and a mold clamping apparatus are disposed on the upper surface of a machine base.
2. Description of the Related Art
Conventionally, a motor-driven-type injection molding machine in which servomotors are used as drive sources has been known (see, for example, Japanese Patent Application Laid-Open (kokai) No. 9(1997)-11290.
Such a motor-driven-type injection molding machine comprises a screw reciprocation drive section and a screw rotation drive section. In the screw reciprocation drive section, a servomotor for screw reciprocation is attached to a motor attachment member disposed on the upper surface of a machine base; a screw portion of a ball-screw mechanism connected to a motor shaft of the servomotor is screw-engaged with a nut portion provided on a slider which is supported to be movable in the front/rear direction; and a screw is rotatably supported at the front end of the slider. Thus, the screw is advanced and retracted upon rotation of the servomotor for screw reciprocation. In the screw rotation drive section, a servomotor for screw rotation is attached to the slider; and a driver gear attached to a motor shaft of the servomotor is meshed with a driven gear provided on a shaft portion of the screw. Thus, the screw is rotated upon rotation of the servomotor for screw rotation.
The above-described conventional motor-driven-type injection molding machine has the following drawbacks to be solved.
First, since the servomotors must be disposed in the vicinity of the respective portions to which rotation is transmitted (hereinafter referred to as “rotation-transmitted portions”), the servomotors—which are heavy and large in size—care disposed at upper and side portions of the molding machine. Therefore, the molding machine suffers a weight imbalance (i.e., is topheavy), so that transportation and installation of the molding machine cannot be performed in a stable manner.
Second, the servomotors are disposed at a position close to an operator area in an exposed state, and means for insulating motor noise is not provided. Therefore, the operator is exposed to excessive motor noise, so that the molding machine is unsatisfactory in terms of quietness.
Third, since a control unit for the servomotors is typically accommodated within the machine base, connection cords for connecting the control unit and the servomotors become long and are exposed to the outside, resulting in occurrence of various problems such as a problem of an object becoming entangled in the connection cords.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a motor-driven-type injection molding machine having a lowered center of gravity and improved weight balance in order to secure stability during transportation, installation, and other operations.
Another object of the present invention is to provide a motor-driven-type injection molding machine which has an improved degree of quietness in order to improve the working environment.
Still another object of the present invention is to provide a motor-driven-type injection molding machine which can solve various problems which could otherwise occur due to exposed connection cords.
To achieve the above objects, the present invention provides a motor-driven-type injection molding machine comprising an injection apparatus and a mold clamping apparatus disposed on the upper surface of a machine base, wherein large-sized motors (a motor for screw rotation, a motor for screw reciprocation, and a motor for mold clamping) are accommodated in an interior space of the machine base to be located substantially at the center of the machine base with respect to the transverse direction thereof; and each of rotation-transmitted portions provided in the injection apparatus and the mold clamping apparatus is drivingly connected to the corresponding motor via a rotation transmission mechanism comprising a rotation transmission belt.
In the motor-driven-type injection molding machine according to the present invention, the large, heavy motors are accommodated within the interior space of the machine base to be located substantially at the center of the machine base with respect to the transverse direction thereof. Therefore, the height of the overall center of gravity of the molding machine is lowered, weight balance is improved, and the degree of quietness is improved. In addition, the servomotors can be connected directly to a control unit disposed within the interior space of the machine base, without connection cords being routed to the outside of the machine base.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 4540359 (1985-09-01), Yamazaki
patent: 4865536 (1989-09-01), Inaba et al.
patent: 4988273 (1991-01-01), Faig et al.
patent: 5362222 (1994-11-01), Faig et al.
patent: 9-11290 (1997-01-01), None
Koide Atsushi
Matubayashi Koichi
Birch & Stewart Kolasch & Birch, LLP
Heitbrink Tim
Nissei Plastic Industrial Co. Ltd.
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