Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – Pivotally joined housings or housing sections enclosing...
Patent
1988-09-21
1990-12-11
Heitbrink, Timothy
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
Pivotally joined housings or housing sections enclosing...
425190, 4254501, 4254509, 425589, 425595, 425DIG5, 425DIG129, 425DIG221, 4254519, B29C 4566
Patent
active
049766023
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a die clamp mechanism for removably mounting dies on a stationary board and a movable board of an injection-molding machine, and more particularly, to a motor-operated die clamp mechanism capable of producing a great clamping force even with use of small-output motors.
2. Description of the Related Art
In an injection-molding machine, dies are mounted on a stationary board and a movable board by the so-called "direct fastening" or "click fastening." In the former case, each die is fastened to its corresponding board, stationary or movable, by screwing mounting bolts into tapped holes which are formed in the stationary or movable board so as to be in alignment with mounting holes of the die. In the latter case, on the other hand, clamp plates, which are attached individually to the stationary and movable boards for movement, are driven toward the dies by manual operation or by means of a hydraulic mechanism, and a mold base of each die and clicks of its corresponding clamp plate are pressed against one another for engagement, thereby fastening the dies to the stationary and movable boards.
In the case of a motor-operated die injection-molding machine in which a mold clamp mechanism, injection mechanism, etc. are driven by means of motors, however, a die clamp mechanism should preferably be driven also by means of motors. Thus, when hydraulically driving a die clamp mechanism of a click-fastening type in a conventional manner, a hydraulic mechanism must be provided only for die mounting, resulting in poor economy.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a motor-operated die clamp mechanism of an injection-molding machine capable of producing a great clamping force even with use of motors having low output torque, without using a hydraulic mechanism to mount dies on a stationary board and a movable board of an injection-molding machine.
In order to achieve the above object, a motor-operated die clamp mechanism according to the present invention comprises: a plurality of pressure means disposed individually on a stationary board and a movable board of the injection-molding machine so as to be movable toward and away from a die corresponding thereto and capable of pressing the corresponding die; a plurality of motor means corresponding to the plurality of pressure means; and a plurality of transmission means for amplifying the rotatory force of each corresponding one of the plurality of motor means and transmitting the amplified rotatory force to each corresponding one of the plurality of pressure means.
According to the present invention, as described above, the die clamp mechanism is driven by means of motors, so that a hydraulic mechanism need not be used for the clamp mechanism. Thus, there may be provided a clamp mechanism which is particularly adapted for a motor-operated injection-molding machine and is low-priced. Since the rotatory force of the motors is amplified by means of the transmission means, moreover, small-output motors can be used, thus permitting a low-priced clamp mechanism to be obtained.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view showing a motor-operated die clamp mechanism according to a first embodiment of the present invention;
FIG. 2 is a schematic view taken along line II--II of FIG. 1;
FIG. 3 is a front view of a clamp mechanism according to a second embodiment of the present invention, provided on the stationary-board side of an injection-molding machine;
FIG. 4 is a partial view showing the principal part of a die clamp mechanism according to a third embodiment of the present invention; and
FIG. 5 is a partial side view showing the principal part of the clamp mechanism of FIG. 4.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIGS. 1 and 2, a motor-operated die clamp mechanism according to a first embodiment of the present invention is preferably provided in a motor-operated injection-molding machine (not shown in detail) of a type w
REFERENCES:
patent: 4645447 (1987-02-01), Sumitomo
patent: 4698007 (1987-10-01), Hehl
patent: 4810182 (1989-03-01), Groll
Fanuc Limited
Heitbrink Timothy
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