A-A-417 Ribbons, TypewriterThis Commercial Item Description covers nylon fabric ribbons to be used on typewriters.

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A-A-417C

4.2 Performance Test.

4.2.1 Select one sample ribbon and place in the machine designated for its use in the contract and operate the machine in the normal manner until the ribbon has run its full course and is wound from one side to the other. During the course of the test operation, the ribbon shall be observed to ensure that it is not binding or twisting so as to interfere with proper printing. Upon completion of the test, the printing matter (the product of the ribbon printing test) shall be examined to ensure that the quality of print is uniformly dark and with no blank spots, light spots, or discontinuities. Failure to comply with any of these requirements shall be cause for rejection after testing in accordance with ASTM F 92.

4.2.2 As an alternative to the prescribed performance test, the contractor may supply a certification from the equipment manufacturer that the ribbon, identified by part number has been tested and will function properly on the equipment for which it was designed. Selected samples will then be tested on any compatible printer for the print quality defined above.

4.2.3 If the manufacturer refuses to certify the ribbon or tape, then the ribbon manufacturer may then be certify that the ribbon manufacturer (contractor) guarantees that the ribbon or tape will function properly on the equipment for which it has been designed.

4.2.4 Ribbon Condition (end of test). Ribbon shall withstand the test without signs of excessive frayed edges, excessive curling, or the development holes. Excessive shall be interpreted to mean when frayed edges or curling (1) is the cause of broken characters or (2) interfere with proper ribbon feed.

Table II

Impression/Character Yield of Printer Ribbons

5. Packaging:

5.1 Packaging, packing and marking shall be as specified in the contract or order.