Data processing: measuring – calibrating – or testing – Measurement system – Statistical measurement
Reexamination Certificate
1998-12-15
2001-10-23
Shah, Kamini (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Statistical measurement
C425S542000
Reexamination Certificate
active
06308141
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of and an apparatus for analyzing alarms of an injection molding machine.
2. Description of the Related Art
As an apparatus for analyzing an operating state of an injection molding machine, there is proposed an operating time analyzer for individually summing up and displaying time periods of manual operation, an automatic operation and an alarm occurrence in Japanese Patent Publication No. 4-341817. However, this apparatus merely sums up and displays the alarm occurrence time and cannot clearly provide a relationship between the alarm and the production time etc.
As a molding trouble display method for displaying trouble history of an injection molding machine, there is proposed a method in which alarm items are classified and edited and displayed on a monitor in Japanese Patent Publication No. 7-241896. However, this method merely displays the alarm items by rearranging them according to the number of alarms and cannot necessarily perform the statistical processing intended by an operator.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method of and an apparatus for analyzing alarms of an injection molding machine in which the relation between the alarm and the production time can be grasped clearly and also various kinds of statistical processing can be performed in accordance with an operator's request.
According to the present invention, the number of alarms, a ratio of the number of alarms to operating time of an injection molding machine or a ratio of the number of alarms of a selected item to the total number of alarms is totalized and displayed with respect to a time zone, a type of resin used or a production schedule. Also, the suspension time caused by alarms, a ratio of the suspension time to the operating time or a ratio of the suspension time to the number of alarms is totalized and displayed with respect to an item selected from items of a time zone, a product, a type of alarm, an alarm group, a resin used and production schedule.
Further, the number of alarms, a ratio of the number of alarms to the production time or a ratio of the number of alarms on a selected item to the total number of alarms are totalized and displayed with respect to combined two or more items selected from items of a time zone, a product, a type of alarm, an alarm group, a type of resin used and a production schedule. Also, the suspension time caused by an alarm, a ratio of the suspension time to the operating time or a ratio of the suspension time to the number of alarms is totalized and displayed with respect to combined two or more items selected from items of a time zone, a product, a type of alarm, an alarm group, a type of resin used and a production schedule. Thereby, various kinds of statistical processing can be performed in accordance with operator's request.
Further, using a host computer connected to a plurality of injection the ratio of the number of alarms to the operating time or the ratio of the number of alarms on a selected item to the total number of alarms is totalized and displayed with respect to an item selected from items of each injection molding machine, a time zone, a product, a type of resin used and a production schedule. Also, using a host computer connected to a plurality of injection molding machines through a data transmission path, the suspension time caused by alarms, the ratio of the suspension time to the operating time or the ratio of the suspension time caused by alarms of a selected item to the total number of alarms is totalized and displayed with respect to an item selected from items of each injection molding machine, a time zone, a product, a type of alarm, an alarm group, a type of resin used and a production schedule. By this arrangement, alarm data of the plurality of injection molding machines are concentratedly analyzed.
Further, using a host computer connected to a plurality of injection molding machines through a data transmission path, the number of alarms, the ratio of the number of alarms to the operating time or the ratio of the number of alarms of an item to the total number of alarms is totalized and displayed with respect to combined two or more items selected from items of each injection molding machine, a time zone, a product, a type of alarm, an alarm group, a type of resin used and a production schedule. Also, using a host computer connected to a plurality of injection molding machines through a data transmission path, the ratio of the suspension time caused by alarms to the operating time or the ratio of the suspension time to the number of alarms is totalized and displayed with respect to combined two or more items selected from items of each injection molding machine, a time zone, a product, a type of alarm, an alarm group, a resin used and or a production schedule. Thereby, the concentrated control of data and various kinds of statistical processing in accordance with operator's request can be performed.
Further, the period for totalizating on each item can be designated arbitrarily within a period for which the data of alarm and operation are collected, and the totalized data for a desired period can be taken out easily.
The aforementioned various totalizing results are displayed by numerical values or a graph.
Also, a relationship between the number of alarms and an average operation suspension time for one alarm is displayed for each element of aforesaid item by a graph. Thereby, a relationship between a probability of alarm occurrence and suspension time of molding operation caused by one occurrence, a degree of adverse effect caused by a specific alarm element on the final efficiency of molding operation, a priority of alarm element for which the problem should be solved and the like can clearly be judged visually.
Further, by displaying contour lines on which a product of the number of alarms and the average suspension time is a set value, on a graph, a degree of effect caused by each element of alarm on the molding operation can be grasped easily.
REFERENCES:
patent: 5344301 (1994-09-01), Kamiguchi et al.
patent: 5470218 (1995-11-01), Hillamn et al.
patent: 5539650 (1996-07-01), Hehl
patent: 5586041 (1996-12-01), Mangrulkar
Neko Noriaki
Ogawa Noriko
Saito Osamu
Fanuc Ltd.
Raymond Edward
Shah Kamini
Staas & Halsey , LLP
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