Fanuc Corporation

Masayuki Ueno

Masao Kamiguchi

Tatsuhiro Uchiyama

Minoru Kobayashi

Toru Shirahata

In a controller for avoiding interference between a mold body comprising a mold and a peripheral equipment installed to said mold and a product removing unit in an injection molding machine, a distance between the position of the mold body and the position of the product removing unit is determined. It is then judged whether or not the distance is smaller than a predetermined distance. If the distance is smaller than the predetermined distance, the operation of product removing unit is decelerated or stopped.

Controller for avoiding interference

A disturbance estimating observer is provided, which estimates a load applied to a servomotor for driving an ejector axis. When an ejector operates, the disturbance load torque estimated by the observer is sampled for each specific period ( to j), and the data DA ( ) to DA (i, j) of (i&plus; ) ejector processes are stored in a table TA in the form of cyclic storage. From this table TA, average values DB ( ) to DB (j) of estimated disturbance load torques are determined in turn and they are stored in a table TB. From these average values, upper limit values DC ( ) to DC (j) and lower limit values DD ( ) to DD (j) of a permissible range are stored in tables TC, TD. When the determined estimated disturbance load torque has exceeded the permissible range, an abnormal load signal is outputted.

Ejector controller of injection molding machine

A mold protection device for an injection molding machine capable of automatically setting a reference value for detecting an abnormal load exerted on a mold in a mold closing process. A load exerted on a servomotor for driving a mold clamping mechanism is estimated by a disturbance estimating observer provided in a control system of the servomotor. The estimated disturbance torque is sampled at every predetermined period in a mold protection region and cyclically stored in a table TA as data DA ( ) to (i, j) in mold closing processes of the number (i&plus;1). A predetermined amount is added to an average value of data DA ( n) to (i, n) to define an upper limit DC(n) for the disturbance torque and stored in the table TC. If the estimated disturbance torque at each sampling period exceeds the upper limit DC(n) of in the mold protection region in a present mold closing process, an alarm is issued to indicate abnormal load. An optimum reference value for determining an abnormal load is automatically set for securely protecting the mold without requiring an operator to manually set the reference value.

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Yamanashi, Japan

Masayuki Ueno