Machine element or mechanism – Alternating-motion driven device with means during operation... – Stroke adjustable to zero and/or reversible in phasing
Patent
1994-07-21
1996-01-02
Bonck, Rodney H.
Machine element or mechanism
Alternating-motion driven device with means during operation...
Stroke adjustable to zero and/or reversible in phasing
74522, 100271, B30B 106, F16H 2144
Patent
active
054798388
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a two-stage drive type lever unit in which a force is applied first to a force point and then to a fulcrum, and a machine apparatus using the same.
BACKGROUND ART
when, e.g., an injection mold is to be locked by using a pressing device, after a mold weighing, e.g., 100 kg is moved for 5 cm to a locking position, the mold is moved for only 1 mm to perform necessary mold locking. In mold locking, a pressure of 5,000 kgf is required to move a 100-kg mold for a travel of 1 mm. Although a kinetic energy of 100 kgf is sufficient for moving the 100-kg mold for 1 mm for initial positioning, 5,000 kgf is required to move this mold for the same distance of 1 mm for mold locking. Thus, if only one power source is provided, a kinetic energy of 5,000 kgf is required to move the mold for 5 cm as well. In this case, movement of 5 cm must be performed quickly, while mold locking of 1 mm must be performed slowly. Hence, a unit for changing the moving speed between movement and mold locking is also necessary. In a conventional pressing device, a lever unit is used to transmit a kinetic force from a power source to a press head, a force from the power source is applied to the force point of this lever unit, and the press head is connected to the action point. However, since an unnecessarily large power source must be used, the energy is wasted, and the apparatus becomes large in size.
DISCLOSURE OF INVENTION
It is, therefore, an object of the present invention to provide a small-size lever unit that can realize energy conservation, and a machine apparatus using the same.
According to the present invention, this object can be achieved by fabricating a two-stage drive type lever unit in which different power supplies are connected to the force point and fulcrum of the lever unit and a force is applied first to the force point and then to the fulcrum, and a machine apparatus using this lever unit.
Regarding the lever unit, the present inventor previously invented a lever unit in which the fulcrum is moved by the pivotal movement of a lever member and filed this invention as, e.g., PCT International Application No. PCT/JP90/00737 on Jun. 6, 1990 (now U.S. Pat. No. 5,182,967). The content of the previous PCT application is referred to and incorporated in the present application, so that a detailed description of the lever unit of the previous application will be omitted. Also, the present inventor made a PCT application of a lever unit as an improvement over the invention of the previous PCT application on the same day as that of the present application. It is clearly noted that the content described in this PCT application as an improvement is similarly referred to and incorporated in the present application.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram showing the schematic arrangement of a pressing device constituted by using a lever unit according to an embodiment of the present invention.
FIGS. 2 to 4 are diagrams showing the schematic arrangements of pressing devices respectively constituted by using lever units according to other different embodiments of the present invention.
FIGS. 5 and 6 are diagrams showing the arrangements and numerical values of the respective portions of a conventional toggle mechanism when a mold is moved with it to perform mold locking.
FIGS. 7 and 8 are diagrams showing the arrangements and numerical values of the respective portions of a conventional crank mechanism when a mold is moved with it to perform mold locking.
FIG. 9 is a table showing the advantages and disadvantages of the various types of operations that are performed in accordance with the toggle method, crank method, and two-stage drive method according to the present invention.
FIG. 10 is a diagram showing the schematic arrangement of an example in which the present invention is applied to a plastic injection machine.
BEST MODE OF CARRYING OUT THE INVENTION
The embodiments of the present invention will be described in detail with reference to the accompanying d
REFERENCES:
patent: 2106068 (1938-01-01), Sirch
patent: 2491548 (1949-12-01), Branson
patent: 3613465 (1971-10-01), Wood
patent: 4565105 (1986-01-01), Peterson
patent: 5182967 (1993-02-01), Yoshizawa et al.
Bonck Rodney H.
Grabow Troy
Yoshiki Industrial Co., Ltd.
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