Compact injection molding machine with casters

Details Compact injection molding machine with casters Compact injection molding machine with casters

1999-10-08

2001-11-27

Nguyen, Nam (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With transportation device for relocating molding apparatus...

C425S144000, C425S150000, C425S556000, C425S589000

Reexamination Certificate

active

06322343

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a wagon type compact injection molding machine with casters in which inside and outside a base cabinet of the machine, all units and devices required for injection molding are assembled, and which can be manually moved and installed on an arbitrary place.
2. Background Art
The conventional type of compact injection molding machine has a base cabinet formed in larger size than an injection unit and a mold clamping unit in order to ensure footprints for a hydraulic pump and the like, even though the injection unit and mold clamping unit are reduced in size. Such a base cabinet is, however, merely a downsized one of usual structure, and consequently the whole machine including molds is adapted to be moved and installed by hoisting it with a crane in the same way as before, even if it has achieved weight reduction by downsizing.
In a specification of Japanese Utility Model Laid-Open Publication No. Hei 6-20027, an electric type injection molding machine is described which is intended to make it compact in size by making use of the inside of its base cabinet to receive a control unit, a mold temperature regulator and the like, and which is adapted to be movable by using load wheels mounted on the base cabinet. Movement of the molding machine in accordance with this prior art, however, essentially necessitates a guide rail laid down on a floor plate, and hence the movement of machine is exclusively limited to the direction of the rail once the machine has been installed. It is not possible, therefore, to move the machine into any other direction to reinstall it.
In addition, in this prior art molding machine, a plurality of electric servomotors, which drive an injection unit and a mold clamping unit, are all mounted vertically on the upper part of the respective units of the molding machine; this makes the molding machine taller, and higher in the barycenter more than necessary. Further, this prior art molding machine has not yet achieved the size reduction so as to allow easy movement, though it was intended to provide a compact injection molding machine by making use of the inside of base cabinet.
In recent years, molds have also become lightweight so as to be held by hand due to the weight reduction by downsizing, allowing the mold exchange to be performed by manual work. However, since the base cabinet has no footprint for molds thereon, the treatment for mold exchange is more troublesome than that with the aid of an exchange device as before; this creates a problem that mold exchanges at frequent intervals impose burdensome work particularly on female workers.
SUMMARY OF THE INVENTION
The present invention was devised to resolve the above-mentioned problems associated with an injection molding machine. Accordingly, it is an object of the present invention to provide a novel compact injection molding machine in which a base cabinet is formed of a tall cabinet with a rectangular top surface and which is put together more compact than prior art molding machines by utilizing the inside and top surface of its base cabinet, and which is constructed so as to be manually moved with ease like a wagon by adopting casters.
Another object of the present invention is to provide a new compact injection molding machine which may use any of oil pressure and electric power as their driving source and which can be constructed without the need for changing the size of base cabinet even though the base cabinet has incorporated the driving source and mold temperature regulator together into it, and which permits the top surface of base cabinet to be utilized as a work table.
The present invention provides a compact injection molding machine with casters which comprises an injection unit and a mold clamping unit which use oil pressure as their driving source; mold cooling means composed of a chiller unit cooler, a water tank and a cooling water pressure pump; a mold temperature regulator for regulating mold temperature; hydraulic drive means such as a hydraulic pump, an oil tank and valve units in a hydraulic circuit; a control unit which controls each of these units; and a base cabinet formed of a tall cabinet with a rectangular top surface; wherein the base cabinet allows the molding machine to be manually moved and installed by mounting casters on the bottom of the cabinet; the injection unit and the mold clamping unit are disposed longitudinally on the top surface of the base cabinet; the inside of the base cabinet is partitioned into upper and lower parts by at least one partition plate; within the base cabinet, the mold cooling means and the mold temperature regulator are received on a floor plate below the partition plate, the hydraulic drive means and the control unit are received on the partition plate, and the hydraulic drive means is connected to the injection unit and mold clamping unit via the hydraulic circuit.
Furthermore, the present invention provides a compact injection molding machine with casters which comprises an injection unit and a mold clamping unit which use electric power as their driving source; a servomotor for injection which moves together with the injection unit, a servomotor for metering and a servomotor for nozzle touch; a servomotor for mold clamping and a servomotor for an ejector; and a base cabinet formed of a tall cabinet with a rectangular top surface; wherein the base cabinet allows the molding machine to be manually moved and installed by mounting casters on the bottom of the cabinet; the injection unit and mold clamping unit are disposed longitudinally on the top surface of the base cabinet at right side and left side in order respectively; the inside of the base cabinet is partitioned into upper, lower, right and left reception chambers by at least two partition plates; and within the base cabinet, the servomotor for injection, the servomotor for metering and the servomotor for nozzle touch are received in the reception chamber of upper right half, while the servomotor for mold clamping, the servomotor for ejector and a water tank are received in the reception chamber of upper left half, and other units and devices required for the injection molding of resin are received on the floor of the lower reception chambers.
It is preferable that the injection unit and mold clamping unit are disposed longitudinally offset toward the counter-operation side on the top surface of base cabinet so that the operation side of the top surface of base cabinet is formed as a work table.
It is also preferable that at the nearly central part of a front plate of said base cabinet, a molding product chute of a chuter is provided, said chuter being disposed in said base cabinet at a position below an open space of the mold clamping unit opened.
In the above-mentioned configuration in accordance with the present invention, since all units and devices composing an injection molding machine are integrated into a base cabinet which can be moved by the castors mounted thereon, we have only to secure an installation space for base cabinet in order to prepare the footprint for a molding machine. Further, the compact injection molding machine in accordance with the present invention has an ease of treating which permits the molding machine to be moved easily without being subjected to any constraint of directionality in moving as encountered in conventional compact injection molding machines.
Also, the space secured on the operation side of the top surface of base cabinet can be used as a table for various work in injection molding of resin, to ensure the safety at mold exchange or maintenance.


REFERENCES:
patent: 2107190 (1938-02-01), Shaw
patent: 2718662 (1955-09-01), Bohannon et al.
patent: 4009983 (1977-03-01), Jacobs
patent: 4257755 (1981-03-01), Lemelson
patent: 5536159 (1996-07-01), Yamamura et al.
patent: 5620646 (1997-04-01), Sparer et al.
patent: 05237865 (1993-09-01), None
patent: 08164536 (1996-06-01), None

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