Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Mold motion or position control
Patent
1988-02-17
1990-11-06
Housel, James C.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Mold motion or position control
74 8915, 74661, 100273, 100289, 425419, 4254512, 4254517, 4254519, 425590, 425DIG223, B29C 3322, B29C 4566
Patent
active
049682393
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor-operated, direct-pressure type mold clamping mechanism of an injection-molding machine.
2. Description of the Related Art
An injection-molding machine is furnished with a toggle type mold clamping mechanism, in which a drive source and a moving platen are connected by means of a toggle link, or a direct-pressure type mold clamping mechanism, in which the drive source and the moving platen are connected directly. The clamping mechanism serves to open or close and clamp dies that are attached individually to the moving platen and a stationary platen.
In the mold clamping operation, the dies must be clamped with a strong force. Thus, a requisite for the drive source of a mold clamping mechanism is to be capable of producing a strong clamping force. In the process of injection molding, moreover, the time required for the manufacture of each molding, i.e, the cycle time, is relatively short. Another requisite for the drive source, therefore, is to be able to drive the dies at high speed while they are being opened or closed.
The toggle link acts to help the dies open or close at high speed, and to facilitate the production of a strong clamping force. Thus, the toggle type mold clamping mechanism fulfills both of the aforesaid requirements. The direct-pressure type mold clamping mechanism, on the other hand, has the advantage over the toggle type mold clamping mechanism in that the former does not require mold thickness adjustment for compensating the change of the die thickness. It is difficult for the direct-pressure type mold clamping mechanism, however, to satisfy both the aforementioned requirements. In the case of a direct-pressure type mold clamping mechanism using a motor as its drive source, for example, both of the aforementioned requirements can be fulfilled only if the motor used has a very large capacity, since large capacity motor are expensive, the manufacturing cost of the injection-molding machine increases.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to provide a motor-operated, direct-pressure type mold clamping mechanism, capable of high-speed mold closing and opening operations and of producing a required mold clamping force, without the use of a special, large-capacity motor.
In order to achieve the above object, a direct-pressure type mold clamping mechanism according to the present invention comprises conversion means including a rotating member and a rectilinear motion member movable in unison with a moving platen, the conversion means serving to convert a rotary motion of the rotating member into a rectilinear motion of the rectilinear motion member; a motor for driving the rotating member of the conversion means; transmission means for transmitting the rotation of the motor to the rotating member, thereby rotating the rotating member at high speed; a speed reducer for reducing and enhancing the rotation speed and the rotatory force of the motor, respectively, and transmitting the rotatory force of the motor, thus enhanced, to the rotating member; and switching means for connecting the motor and the rotating member alternatively by means of the transmission means and the speed reducer.
According to the present invention, as described above, the moving platen is driven by means of the motor with the aid of the transmission means in a mold closing or opening step, which, although never necessitating production of a particularly strong driving force, requires the moving platen to move quickly. In a mold clamping step which, although requiring only low speed and small displacement, demands production of a strong clamping force, on the other hand, mold clamping operation is performed with use of a motor output enhanced by means of the speed reducer. Thus, the mold clamping can be effected without using a large-capacity motor, and the mold closing and opening operations can be accomplished in a short time. Accordingly, an economical injection-molding machine with
REFERENCES:
patent: 298226 (1884-05-01), O'Daniel
patent: 951300 (1910-03-01), Breihan
patent: 1243223 (1917-10-01), Robson
patent: 1832960 (1931-11-01), Barrows et al.
patent: 1905113 (1933-04-01), Lasker
patent: 2370622 (1945-03-01), Gastrow
patent: 3063708 (1962-11-01), Wollenhaupt
patent: 3104433 (1963-09-01), Hoern
patent: 3720296 (1973-03-01), Ohno
patent: 3797623 (1974-03-01), Gregorovich et al.
patent: 4552255 (1985-11-01), Sommer
patent: 4696632 (1987-09-01), Inaba
Inaba Yoshiharu
Mitoguchi Fumio
Yamashita Hiromasa
Fanuc Ltd.
Housel James C.
LandOfFree
Direct-pressure type mold clamping mechanism does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Direct-pressure type mold clamping mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct-pressure type mold clamping mechanism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1304470