Control apparatus of copying machine with improved communication function for centralized control unit

• US 5,300,980 A
• Filed: 04/08/1991
• Issued: 04/05/1994
• Est. Priority Date: 04/10/1990
• Status: Expired due to Term

• Current Assignee: Minolta Camera Kabushiki Kaisha, Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Minolta Camera Kabushiki Kaisha, Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Sawada, Yoji, Nagata, Kenzo, Watanabe, Seiji, Kirimura, Toru, Maekawa, Kazunobu, Hirata, Sumiaki
• Primary Examiner(s): Grimley, A. T.
• Assistant Examiner(s): Ramirez, Nestor R.
• Application Number:
  US07/682,122
• Time in Patent Office: 1,093 Days
• Field of Search: 355/202, 355/203, 355/204, 355/205, 355/206, 355/207, 364/184, 364/185, 364/186, 371/29.1, 379/106
• US Class Current: 399/8
• CPC Class Codes: G03G 15/5079 for maintenance
• CPC Class Codes: H04M 11/002 with telemetering systems telemetering in general G08C

Abstract

A control apparatus according to the present invention is a control apparatus collecting data related to copying machines and communicating with a centralized control unit on the basis of the data collected, including a communication device for calling the centralized control unit, a determination device for determining that connection with the centralized control device can not be made in spite of the fact that the communication device is activated, a setting device for setting a retransmission time on the basis of a random number in a predetermined time period in response to a determination output of the determination device, a timer device for counting the present time, and a control device for having the communication device call the centralized control unit again when the present time becomes the retransmission time.

Claims

1. A control apparatus collecting data related to a copying machine and communicating with a centralized control unit on the basis of the collected data, comprising:

communication means for calling said centralized control unit;

first control means for activating said communication means when a predetermined transmission condition is satisfied, said predetermined transmission condition including one with high priority and one with low priority;

determination means for determining that connection with said centralized control unit cannot be made in spite of the fact that said communication means is activated;

differentiating means for differentiating a priority of said predetermined transmission condition in response to an output of said determination means;

setting means for setting retransmission time on the basis of a random number from a predetermined time period when it is differentiated by said differentiating means that the priority of said predetermined transmission condition is low;

timer means for counting the present time; and

second control means for having said communication means call said centralized control unit again when the present time becomes the redialing time.

2. The control apparatus according to claim 1, wherein said predetermined transmission condition with low priority is satisfied when the present time comes to a predetermined time set in advance.

3. The control apparatus according to claim 1, wherein said transmission condition with high priority is satisfied when a trouble occurs.

4. The control apparatus according to claim 1, further comprising second setting means for setting a retransmission time which is a predetermined time period after the present time when it is decided by said differentiating means that the priority of said predetermined transmission condition is high.

5. A control apparatus collecting data related to a copying machine and communicating with a centralized control unit on the basis of the collected data, comprising:

communication means for calling said centralized control unit;

first control means for activating said communication means when a predetermined transmission condition is satisfied, said predetermined transmission condition including one with high priority and one with low priority;

determination means for determining that connection with said centralized control unit can not be made in spite of activation of said communication means;

second control means for having said communication means call said centralized control unit again in response to an output of said determining means;

differentiating means for differentiating the priority of said predetermined transmission condition;

deciding means for deciding that the number of times of calling said centralized control unit of said communication means controlled by said second control means exceeds a predetermined calling number of times corresponding to priority of said predetermined transmission condition; and

third control means for forbidding operation of said second control means in response to an output of said decided means.

6. The control apparatus according to claim 5, wherein said predetermined number of times of calling includes a first value for a predetermined transmission condition with high priority and a second value for a predetermined transmission condition with low priority.

7. The control apparatus according to claim 6, wherein said first value of said predetermined times of calling is larger than the second value.

8. The control apparatus according to claim 5, wherein said predetermined transmission condition with low priority is satisfied when the present time becomes a predetermined time set in advance.

9. The control apparatus according to claim 5, wherein said transmission condition with high priority is satisfied when a trouble occurs.

10. The control apparatus according to claim 5, wherein said second control means comprises setting means for setting a retransmission time on the basis of a random number from a predetermined time period.

11. The control apparatus according to claim 5, wherein said second control means comprises setting means for setting a predetermined time period after the present time as a retransmission time.