Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to close mold
Patent
1997-02-10
1998-12-01
Ryan, Patrick
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to close mold
100258A, 4254515, 425592, 425593, B29C 3320
Patent
active
058434968
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an improvement of a mold clamping mechanism of an injection molding machine using a five-point double-toggle link mechanism.
RELATED ART
Mold clamping mechanisms of injection molding machines that utilize toggle links are already known. The mold clamping mechanisms of this type are divided broadly into two categories; single-toggle mold clamping mechanisms composed of single set of a toggle link, and double-toggle mold clamping mechanisms composed of two sets of toggle links.
As shown in FIG. 6 illustrating a general example, an injection molding machine is composed of a mold clamping mechanism b and an injection mechanism c that are arranged in a straight line on a base a. It is advisable generally to miniaturize the mold clamping mechanism b, since the overall length of the mold clamping mechanism b directly influences the overall length of the injection molding machine, and the vertical width of the mold clamping mechanism b influences the substantial overall height of the injection molding machine.
Referring to FIG. 6, a motor-operated injection molding machine is given as an example of the injection molding machine, and the injection mechanism c is provided with an injection servomotor MUI for advancing an injection screw in a beeline by means of a ball nut-screw and a screw-rotation servomotor (not shown) for rotating the injection screw to make it carry out metering-kneading operation. An extruder base d to which the injection mechanism c is fixed is provided with a rectilinear drive mechanism that is composed of an induction motor or servomotor M2, ball screw, ball nut, etc. If necessary, a nozzle touching operation to cause the distal end of an injection cylinder e to plunge into a stationary platen 4 or a sprue breaking operation to cause the cylinder end to recede from the stationary platen 4 is carried out.
The mold clamping mechanism b is composed of the stationary platen 4 fitted with a cavity-side mold g fixed on the base a, a rear platen 6 fastened to the stationary platen 4 by means of tie bars 5, a servomotor M4 for adjusting the position of the rear platen 6 in accordance with the mold thickness and set mold clamping force, and a moving platen 7 movably attached to the tie bars 5, driven by means of a servomotor M3 utilizing a multiplier, and fitted with a force-side mold h. The aforesaid single toggle, double toggle, etc. constitute this multiplier section.
Generally, as shown in FIG. 7, a single-toggle mold clamping mechanism is designed so that a piston of an oscillating hydraulic cylinder 32, which is located at right angles to a toggle link 31 in a lock-up state (FIG. 7(A)), is pivotally mounted on a node portion 33 of the toggle link 31, and the toggle link 31 is bent or stretched by directly pushing or pulling the node portion 33 of the toggle link 31 through extension or contraction of the aforesaid piston, whereby a moving platen 34 is moved to perform mold opening or clamping operation. Naturally, the opposite end portions of the toggle link 31 used are pivotally mounted on the respective central portions of a rear platen 35 and the moving platen 34, and the bottom portion of the oscillating hydraulic cylinder 32 that causes the toggle link 31 to bend or stretch is pivotally mounted for rocking motion on the top surface of the body (not shown) of the injection molding machine that carries the mold clamping mechanism thereon.
As shown in FIGS. 8(A) and 8(B), moreover, a double-toggle mold clamping mechanism is designed so that two sets of toggle links 41, which are bendable toward each other, are juxtaposed in upper and lower positions between a rear platen 42 and a moving platen 43, a crosshead 44 movable straight in the mold opening or clamping direction is provided in a position intermediate between the two toggle links 41, and an end portion of a crosshead link 47 that is pivotally mounted on a node portion 45 of each toggle link 41 or a position 46 nearby is pivotally mounted on the aforesaid crosshead 44. By linearly mov
REFERENCES:
patent: 4773845 (1988-09-01), Nagura et al.
patent: 5370524 (1994-12-01), Liang et al.
patent: 5565224 (1996-10-01), Stillhard
patent: 5585126 (1996-12-01), Heindl et al.
Ito Susumu
Nishimura Koichi
Fanuc Ltd.
Ryan Patrick
Schwartz Iurie A.
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