Patent GB-1427292-A (GB)
Title: Recorder for copiers
IPC: G03G21/02
Filed: 1974-03-26
Abstract: 1427292 Recording apparatus XEROX CORP 26 March 1974 [26 March 1973] 13466/74 Heading G1J Real-time information about patterns of operation, failure, and customer usage of a  xerographic copier 10 is recorded on magnetic tape 201, preferably a cassette tape, by a recording head 204 of an on-line recorder 8, means to monitor chosen operating characteristics of the copier providing recordable data identifying the characteristics as they occur, the data being stored pending recording, and a block of the stored data being released to the recording head 204 under the control of circuitry 225 on the occurrence of a pre-determined event in the copier. As shown, the copier 10 includes a sorter 100 and an automatic document handler 150. The recorder 8 includes a tape drive motor 202, a mode switch 210 having positions 211, 212 for indicating normal recording and copier servicing respectively, and a spare position 213, a clock 300 measuring total operating time of the recorder 8, a clock 301 measuring the time of events such as, e.g. individual copying cycles, and a multi-channel counter 302 to record the number of occurrences of certain events in the copier. Circuits 226, 228 (Fig. 5a) control recording of individual data blocks. Inputs to circuit 226 may be triggered by resetting the mode switch 210, turning the power to the copier off or on (229), the counter 302 or one channel thereof approaching its maximum value (230), or switching the sorter 100 or document handler  150 on or off. An input 234 to circuit 228 is  triggered by termination of a copying cycle either on completion or because of a fault such as paper jamming, loss of paper supply, or fuser overheating. Actuation of either circuit 226 or 228 triggers motor control circuit 237, via OR gate 235, to start the tape drive motor 202 and, via an AND gate 240 or 241 to initiate a recording cycle. To accomodate simultaneous actuation of circuits 226, 228, a NAND gate 325 blocks 226 output while circuit 228 is active. Following activation of the circuit 226, AND gate 240 triggers circuit 242 to record a block identifying code on tape 201, circuit 245 records the time from clock 300, circuit 250 records the counts from some or all of the channels of counter 302, circuit 254 records any optional data, e.g. use of the document handler 150, circuit 262 records the operating mode of the copier, circuit 265 records an "end of block" code, and a reset circuit 269 resets the appropriate channels of counter 302 and stops the tape drive motor 202. Following activation of circuit 228, AND gate 241 triggers circuit 270 to record a block identifying code, circuit 245 records the time from clock 300, circuit 250 records the counts from selected channels of counter 302, giving the number of copies made up to the moment when the copying cycle stopped, a circuit 278 records from clock 301 the length of time between the start and end of the copying cycle, a circuit 281 records data identifying the reason for stopping the copying cycle, circuit 284 records data on the condition of copier, sorter, and handler components when the copying cycle was stopped, circuit 262 records the operating mode of the copier, circuit 265 records an "end of block" code, and a reset circuit 292 resets the clock 301, the appropriate channels of counter 302, and stops the tape drive motor 202.