| 摘要 |
1,234,374. Facsimile transceivers. XEROX CORP. 16 June, 1969 [17 June, 1968], No. 30398/69. Heading H4F. A self-test facility for a document facsimile transceiver, e.g. of the Telecopier type, comprises means, including an enabling switch 66, for energizing both the scan circuitry 62 and print circuitry 64 and coupling means, such as a dummy telephone headset 78 which produces audio coupling between transmit and receive transducers 82, 84 in an acoustic coupler 36, for coupling the output of the scan circuitry 62 to the input of the print circuitry 64. The scanning part of the transceiver, in this case comprising two scanning heads 24, 25 on a rotating turret scanner unit 4, scans a test label fixed to a test document 59 and the printing part, in this case impact printing heads 34, 35, simultaneously reproduces the image of the label elsewhere on the document 59 for comparison with the original. The acoustic coupling arrangement may be replaced by electrical coupling, e.g. inductive in nature. The test document 59 may use a carbon, or other colorant, paper or a system involving the use of encapsulated colouring fluid. Alternatively the impact printing arrangement may be replaced by electrolytic or electrostatic printing means. |
