Vertical injection molding machine

Details Vertical injection molding machine Vertical injection molding machine

2007-02-20

2007-02-20

Mackey, James P. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

With indicator, signal, recorder, illuminator, or inspection...

C425S136000, C425S154000, C425S593000

Reexamination Certificate

active

11106478

ABSTRACT:
A vertical injection molding machine designed to move up/down a large weight by a toggle link mechanism so as to perform mold opening/closing. In a foreign matter detection region where a mold opening/closing servo-motor is subjected to speed feedback control during a mold closing process, a measured torque value of the mold opening/closing servo-motor is compared with a standard torque characteristic curve with no foreign matter between dies. Between a start position of the foreign matter detection region and a position of the foreign matter detection region in which a torque value is zero in the standard torque characteristic curve, it is concluded that there is a foreign matter between the dies when the measured torque is lower than the standard torque characteristic curve by a predetermined value or more. Between the position of the foreign matter detection region in which a torque value is zero in the standard torque characteristic curve and an end position of the foreign matter detection region, it is concluded that there is a foreign matter between the dies when the measured torque is higher than the standard torque characteristic curve by a predetermined value or more. The foreign matter between the dies can be detected surely without provision of any weight compensating mechanism.

REFERENCES:
patent: 4755124 (1988-07-01), Tanaka et al.
patent: 5393210 (1995-02-01), Kasai et al.
patent: 5800750 (1998-09-01), Laing et al.
patent: 5851699 (1998-12-01), Matsubayashi et al.
patent: 7041242 (2006-05-01), Hakoda et al.

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