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Monitor system and method for detecting sequential events in a cyclical process
| Details |
Inventors: Doljack, Frank A.;
Assignee: The B. F. Goodrich Company (Akron, OH)
Primary Examiner: Wise; Edward J.
Assistant Examiner:
Attorney, Agent or Firm: Lindsay; James R.
The invention relates to a monitor system and method for monitoring the occurrence of events in a cyclical process. Whether the successive events occur at their proper positions within the process, position meaning, for example, a physical location and/or a position in time, is accurately monitored, and the process is stopped and a warning issued when an event is missed. Monitoring can be restarted at a point of interruption with resumption of correct checking for successive events. Moreover, if an event is missed, the process and monitoring may be restarted and the missed event selectively automatically deleted from the list of sequential events for which the monitor system looks. The invention is employed, for example, in connection with a conveyor belt system to detect rips in the belt. |
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DETAILED DESCRIPTION Briefly, the invention relate to a monitor system and method for monitoring the occurrence of events in a cyclical process.
Whether the successive events occur at their proper positions within the process, position meaning, for example, a physical location and/or a position in time, is accurately monitored, and the process is stopped and a warning issued when an event is missed.
Monitoring can be restarted at a point of interruption with resumption of correct checking for successive events.
Moreover, if an event is missed, the process and monitoring may be restarted and the missed event selectively automatically deleted from the list of sequential events for which the monitor system looks.
The monitor system is versatile in that it may be conveniently programmed to monitor different process having respective numbers and positions of events occurring in cyclical order.
To effect such monitoring, the monitor system automatically builds a table of information concerning the expected position of each event.
The monitor system looks for each event at its proper position, usually within a selected window of error on both sides of the anticipated position, and upon detecting an event the monitor system updates its internal information concerning the actual position of the event.
Thus, the monitor system automatically adjusts for gradual variation in the position of each event within the permitted window of error.
Although the preferred embodiment and best mode of the monitor system of the invention is employed in connection with a conveyor belt system to detect rips in the belt, as will be described in greater detail below, it will be appreciated that the monitor system may be used to monitor the occurrence of any group of events that occur in a cyclical process.
For example, the monitor system may monitor an automatic machining process.
The position of a part within a multiple operation machine is compared against information developed by transducers indicative of the physical characteristics of the part; if the signals do not compare properly for a given stage in the machine process, the monitor system will shut down operation until an inspector determines the reason for mismatch, such as a broken cutter tool or the like
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