| 摘要 |
1,128,386. Programmed electric control. BLACKBURN ELECTRONIC PRODUCTIONS Ltd. May 23, 1967 [May 26, 1966], No.23643/66. Heading G3N. [Also in Division D1] A circuit for arresting a pattern controlled textile machine having needles controlled photoelectrically through relays comprises an alarm and stopping circuit which is energized if each relay does not operate at least once per machine cycle. The pattern P reflects light to each photocell PC which through amplifier AM energizes a relay G which through a contact G1 fires a thyristor SCR by a resistor R5 energizing a relay Z which opens contact Z1 in parallel with similar contacts in similar circuits controlled by other photo-cells. Contacts Z2 illuminate a green lamp GL and contacts Z3 open. When the machine is first energized relays A, E, and slow to operate T are energized but contacts T1 are not closed until the end of the cycle time which energizes a relay D via contacts C2, R3, contacts of D1 releasing all the Z relays and contacts D2 releasing relay T. Contacts T1 release relay D after a delay due to capacitor A2 when contacts D1 reclose. If however relay G does not operate, relay Z is not operated hence at the end of the cycle when T1 closes, relay C is energized and held by contacts C1, and the delay due to CR network R3, A1 prevents momentary operation of relay D. Capacitor A2 charges slowly through contacts C2 and resistor R1 hence operating relay B. Contacts B2 discharge capacitor A2 through resistor R2 thus releasing relay B. Contacts B1 flash the lamp AL as contacts Z3 are closed, and contacts C3 operate which de-energizes the circuit SC, hence stopping the machine. Individual circuits may be cut out by a manually operated switch ST. After rectification of the fault a manual switch MR is momentarily closed operating relay D which de-energizes the thyristors through contacts D1, contacts D2 release relay T and contacts D3 releases relay C. The timing relay T may be replaced by contacts closing once each pattern repeat. |
